WO2005044107A1 - X線計測装置及びx線計測方法 - Google Patents
X線計測装置及びx線計測方法 Download PDFInfo
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- WO2005044107A1 WO2005044107A1 PCT/JP2004/009866 JP2004009866W WO2005044107A1 WO 2005044107 A1 WO2005044107 A1 WO 2005044107A1 JP 2004009866 W JP2004009866 W JP 2004009866W WO 2005044107 A1 WO2005044107 A1 WO 2005044107A1
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- 238000005259 measurement Methods 0.000 title claims abstract description 186
- 238000000691 measurement method Methods 0.000 title claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 93
- 238000000034 method Methods 0.000 claims description 27
- 238000007689 inspection Methods 0.000 claims description 14
- 239000003086 colorant Substances 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 3
- 230000002123 temporal effect Effects 0.000 abstract description 8
- 239000002872 contrast media Substances 0.000 description 36
- 238000002347 injection Methods 0.000 description 15
- 239000007924 injection Substances 0.000 description 15
- 210000004204 blood vessel Anatomy 0.000 description 12
- 238000013480 data collection Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 8
- 238000003384 imaging method Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000002583 angiography Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 241000233855 Orchidaceae Species 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000017531 blood circulation Effects 0.000 description 1
- 230000002490 cerebral effect Effects 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
- A61B6/4435—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being coupled by a rigid structure
- A61B6/4441—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being coupled by a rigid structure the rigid structure being a C-arm or U-arm
Definitions
- the present invention relates to an X-ray measurement technique for obtaining a three-dimensional blood vessel image by imaging a contrasted blood vessel using X-rays.
- C-arm type X-ray measurement device that is installed at both ends of a C-shaped support (hereinafter referred to as C-arm) so that an X-ray tube and a two-dimensional X-ray detector face each other.
- C-arm C-shaped support
- Japanese Patent Application Laid-Open No. 9-70400 patent example 1 discloses a device in which a C-arm is suspended from a ceiling, and a device in a shape supporting a C-arm from a floor is disclosed in Japanese Patent Application Laid-Open No. 2000-23. Each of them is proposed in Japanese Patent Publication No. 88888 (conventional example 2).
- the X-ray measurement can be performed while rotating the X-ray tube and detector around the subject on the couch by moving the C-arm.
- rotation measurement is performed before injecting a contrast agent into a blood vessel
- rotation measurement is performed by injecting a contrast agent into a blood vessel
- an image is captured between images where the C-arm is at the same position.
- DSA Digital Subtraction Angiography
- 3D—DSA measurement in which a DSA measurement image is reconstructed to obtain a three-dimensional image.
- 3D-DSA measurement in cerebral blood vessels has been proposed in "Image Information Medical, September 2001, Vol. 33 No. 10, pp. 69-75" (conventional example 4).
- Each of them is subjected to correction processing to obtain a set of projection data for 3D reconstruction, and the obtained set of projection data is subjected to reconstruction processing using a 3D reconstruction algorithm.
- the reconstruction algorithm include the Feldkamp method. These reconstruction algorithms are well known.
- an I.I. Image Intensifier
- a video camera As a two-dimensional X-ray detector used in a C-arm X-ray measuring device, an I.I. (Image Intensifier) and a video camera are combined via an optical system.
- One is a camera type X-ray detector, the other is a flat type X-ray detector.
- As a flat X-ray detector there is a type in which an amorphous silicon photodiode and a TFT are paired and arranged on a square matrix, and this is directly combined with a fluorescent screen. These sensors are well known. Disclosure of the invention
- the C-arm returns to the rotation start position after the first rotation measurement before the injection of the contrast agent, and then performs the second rotation measurement after the injection of the contrast agent. Do. That is, by making the rotation direction of the C-arm the same in the first and second rotation measurements, it is unlikely that the first and second rotation measurements will be shifted, and a good DSA image has been obtained.
- the conventional device had a problem that a long unmeasurable time required for the C-arm return occurred between two rotation measurements.
- DSA measurement using the device of Conventional Example 3 described above enables the second rotation measurement on the return path, which returns to the rotation start position, to the forward path, which performs the first rotation measurement before the injection of the contrast agent. By doing so, the interval between the first and second rotation measurements was shortened. At that time, the first and second times In order to prevent deviations in the rotation measurement of the C-arm, the rotation angle of the C-arm at the time of X-ray exposure and image acquisition was stored in the first rotation measurement, and the second rotation measurement A means to perform X-ray exposure and image acquisition with the rotation angle of the C-arm stored in is proposed.
- such a conventional apparatus can rotate only three times, ie, the forward path, the return path, and the forward path, and is not suitable for observing a temporal change of an object.
- the interval time between a plurality of rotation measurements cannot be adjusted, and even if contrast images of different phases are measured by a single injection of a contrast agent, each time is measured. There was a problem that the phase could not be measured at the appropriate contrast timing. Therefore, in order to measure contrast images at different phases, it is necessary to inject a contrast agent for each phase, and the administration of a large amount of contrast agent imposes a heavy burden on the patient. Had. '
- an object of the present invention is to provide an X-ray measurement technique that enables rotation measurement to be repeated at an appropriate contrast timing to obtain a favorable three-dimensional image suitable for observing a temporal change of a subject. Is to provide.
- An X-ray measuring apparatus includes: an X-ray tube that generates X-rays for irradiating an inspection target; an X-ray detector that detects measurement data relating to the inspection target; A holding device that holds an X-ray detector in opposition, a rotating device that changes the relative positions of the X-ray tube and the X-ray detector with respect to the inspection target, and a control processing device that performs arithmetic processing of the measurement data
- the X-ray tube generates X-rays when the rotating device performs forward rotation, the X-ray detector collects measurement data, and the X-ray detector collects measurement data when the rotating device performs backward rotation.
- An X-ray tube generates X-rays
- the X-ray detector collects measurement data
- the control processing device sets an interval time from the end of the forward rotation to the start of the return rotation.
- the interval time from the end of the backward rotation to the start of the forward rotation is rotated. Characterized by setting a.
- the control processing device has a storage device capable of setting a threshold value, and an X-ray image composed of the measurement data has An area is set, a minimum value of the signal strength in the area is calculated, the calculated minimum value is compared with the threshold value, and it is detected that the minimum value has become larger than the threshold value. In this case, the interval time is set.
- the control processing device selects two forward or backward rotations from the two or more reciprocating rotations, and reconstructs measurement data in each rotation.
- the relative position of the two forward or backward rotation reconstructed images is changed, a difference process is performed between the two reconstructed images, and an arbitrary area is set on the obtained difference reconstructed image. Calculating an error in the arbitrary area, and calculating the relative ⁇ It is characterized by detecting the target position.
- control processing device is configured to be equidistant from the rotation plane in parallel with the rotation plane of the X-ray tube, respectively, from the selected reconstructed images of the two rotations.
- a tomographic image to be located is selected, the position of the rotation axis of the X-ray tube is matched in the selected two tomographic images, and the two tomographic images are relatively rotated about the position of the rotation axis.
- a difference reconstructed image is obtained by performing a difference process on all tomographic images at the detected rotation angle.
- the control processing device obtains the plurality of difference reconstructed images, performs a threshold process on each of the difference reconstructed images, and performs a threshold value-processed difference reconstructed image.
- the constituent images are displayed in different colors, and the colored difference reconstructed images are added.
- the control processing device selects a reference reconstructed image from a plurality of reconstructed images, and selects the reference reconstructed image in each of the plurality of reconstructed images.
- a relative position where an error is minimized with respect to a constituent image is detected, and each of the plurality of reconstructed images is moved to the detected relative position. Is set, and an average value of signal intensities in the region is calculated for each of the plurality of reconstructed images.
- the relative positions of the X-ray tube and the X-ray detector with respect to the inspection object are changed while the X-ray tube and the X-ray detector are held facing each other.
- the X-ray tube generates X-rays and the X-ray detector collects measurement data when the rotation performs the forward rotation, and the rotation performs the backward rotation.
- the X-ray tube generates X-rays and the X-ray detector collects measurement data, and the measurement data is collected from the end of the forward rotation to the start of the return rotation. Interval time between the end of the return rotation and the forward rotation Characterized in that the interval time at the start or has to perform to set for each rotation.
- FIG. 1 is a side view illustrating an X-ray measurement apparatus according to an embodiment of the present invention
- FIG. 2 is a front view of the apparatus according to an embodiment of the present invention
- FIG. 3 is an example of a measurement sequence according to the present invention.
- FIG. 4 is a diagram illustrating another example of a measurement sequence according to the present invention
- FIG. 5 is a diagram illustrating an example of a measurement procedure according to the present invention
- FIG. 6 is a diagram illustrating a measurement procedure according to the present invention.
- FIG. 7 is a view for explaining another example
- FIG. 7 is a view for explaining a method of aligning a reconstructed image according to the present invention
- FIG. 8 is a side view for explaining an X-ray measurement apparatus according to another embodiment of the present invention.
- FIG. 1 shows a side view of an X-ray measuring apparatus according to one embodiment of the present invention.
- the X-ray measurement device consists of an X-ray source 101, a detector 102, and a column in the X-ray tube 1.00. 103, a rotation device 104, an angle detection device 105, a bed 106, a control processing device 107, and a contrast medium injection device 108.
- the X-ray tube 100 and the detector 102 are installed on a column 103.
- a C-shaped arm, a U-shaped arm, or the like is used for the strut 103. It is conceivable to suspend the pillar 103 from the ceiling or to support the pillar 103 from the floor.
- the column 103 rotates around the subject 110 lying on the bed 106 around the rotation axis 109 by the rotating device 104.
- the angle detection device 105 detects the rotation angle of the rotation device 104 and outputs it to the control processing device 107.
- the X-ray measurement device has a display device 112 and is capable of displaying measurement data in real time.
- FIG. 1 shows a configuration in which the display device 112 displays measurement data via the control processing device 107. By passing through the control processing device 107, it becomes easy to add processing to the measured data before displaying. It is also possible to adopt a configuration in which measurement data is displayed directly from the detector 102, in which case the real-time performance can be improved.
- FIG. 1 shows a configuration in which the contrast agent injection device 108 is controlled by the control processing device 107. Through the control processor 107, the contrast medium injection timing / speed can be automated. X-ray measurement device. Contrast injection device 108 can be provided independently of other devices. In this case, the timing and speed of contrast injection can be adjusted independently of other devices. And the degree of freedom can be improved.
- FIG. 1 shows a case where the rotation axis 109 and the bed 106 are parallel to the floor as the most general form.
- a tomographic image perpendicular to the body axis of the subject 110 can be obtained as in the case of the conventional CT.
- the rotation axis 109 can be set at an angle to the body axis. The By setting it obliquely, it becomes possible to obtain measurement data while avoiding a region where the X-ray absorption in the subject 110 is large, and it is possible to improve the image quality of the tomographic image.
- the detector 102 As the detector 102, a flat panel sensor, a combination of an X-ray imaging enhancer and a CCD camera, an imaging plate, a CCD detector, a solid state detector, and the like are used. X-rays generated from the X-ray source 101 pass through the subject 110, are converted into electrical signals corresponding to the X-ray intensity by the detector 102, and are sent to the control processor 107 as measurement data. Entered.
- the control processing device 107 controls the generation of X-rays in the X-ray source 101, the acquisition of data in the detector 102, and the rotation of the column 103 in the rotating device 104.
- the X-ray measurement apparatus can perform rotation measurement for generating X-rays and acquiring measurement data while rotating the column 103.
- the control processing device 107 controls the injection of the contrast agent in the contrast agent injection device 108.
- the contrast medium injection device 108 can inject the contrast medium into the blood vessel 111 of the subject 110.
- Fig. 2 shows a frontal excavation of the X-ray measurement device in Fig. 1.
- the rotation device 104 rotates the column 103 on which the X-ray tube 100 and the detector 102 are mounted in both the clockwise direction 201 and the counterclockwise direction 202. be able to.
- strut 103 rotates through an angular range of about 200 °.
- the control processing unit 107 controls the X-ray source 101, the detector 102, and the rotating device 104, and performs both rotation measurement in the clockwise direction 201 and rotation measurement in the counterclockwise direction 202. Can be realized.
- the control processing device 107 has a storage device 113 for inputting and storing the measurement sequence.
- the control processing means 107 has a mode for inputting a measurement sequence as an operation menu, and at the time of input, the input result is displayed on a display c, or the control processor 107 displays the measurement sequence as an operation menu. It has a display mode and displays the sequence numerically or graphically on the display.
- Figure 3 shows an example of the measurement sequence.
- outward path ⁇ return path ⁇ forward path ⁇ return path-forward path is shown.
- the rotation device 104 is set to the rotation start angle.
- the measurement signal 301 is turned ON, and measurement is started.
- the rotation signal 300 is turned on in the plus direction, and the rotating device 104 starts rotating clockwise.
- the rotation signal 302 is turned on, the X-ray pulse signal 303 is turned on, and the X-ray source 101 starts generating pulsed X-rays.
- the X-ray pulse signal 303 is turned off after a predetermined time, and the X-ray source 101 stops generating pulsed X-rays.
- the X-ray pulse signal 303 turns ON.
- the data collection signal 304 When the X-ray pulse signal 303 is turned off, the data collection signal 304 is turned on, and the detector 102 performs data collection. When the data collection is completed, the data collection signal turns off.
- the predetermined data is one screen of a two-dimensional detector, and one quarter of a screen having a size of 1/2 in length and width in the center of the screen.
- the rotation device 104 reaches the rotation end angle, the rotation signal 302 is turned off, and the rotation ends.
- the X-ray pulse signal 303 stops when the rotation signal 302 is turned off. There The X-ray pulse signal 303 stops when a predetermined number is generated.
- the rotation signal 302 is turned on in the minus direction, and the rotating device 104 starts rotating counterclockwise (return).
- the rotation signal 302 is turned on, the X-ray source 101 starts generating pulsed X-rays, and the detector 102 starts collecting data.
- the rotation device 104 reaches the rotation start angle of the first rotation, the rotation signal 302 becomes OFF, and the rotation ends.
- the X-ray pulse signal 303 is generated in response to the OFF of the rotation signal 302 or generated by a predetermined number and stopped. . 'Repeat this series of rotation measurements a predetermined number of times.
- the measurement signal 301 is turned off, and the measurement ends.
- Figure 4 shows another example of the measurement sequence.
- the control processing means 107 generates a synchronizing signal 401, and upon receiving the synchronizing signal 401, turns on the X-ray pulse signal 303.
- the synchronization signal 401 is generated by the detector 102, and the X-ray pulse signal 303 is turned on in response to the ON of the interrogation signal 401.
- the rotation signal 302 When the measurement signal 301 is turned ON, the rotation signal 302 is turned ON in the plus direction, and the rotating device 04 starts rotating clockwise.
- the synchronization signal 401 turns on first after the rotation signal 302 turns on, the X-ray pulse signal 303 turns on, and the X-ray source 101 generates pulse-like X-rays.
- the data collection signal 304 is turned on, and the detector 102 starts collecting data.
- the rotation device 104 reaches the rotation end angle, the rotation signal 302 becomes O It becomes FF, and rotating device 104 stops rotating.
- the X-ray pulse signal 303 is generated when the rotation signal 302 is turned off or a predetermined number is generated, and the generation is stopped.
- the control processor 107 sets a rotation start angle, a rotation end angle, a shooting start angle, and a shooting end angle (step 501).
- the number of repetitions of the rotation measurement and the interval time between the rotation measurements are input to the control processing device 107 and stored in the storage device 113 (step 501).
- the bed 106 is moved to adjust the position of the subject 110 (step 503).
- the support 103 is set to the rotation start angle (step 504).
- the contrast medium injection device 108 injects a contrast medium into the blood vessel 111 of the subject 110 (step 505). Press the measurement start button attached to the control processor 107 (step 506).
- the control processing device 107 starts rotating the rotating device 104.
- the control processing device 107 obtains the rotation angle information of the rotation device 104 from the angle detection device 105, and when the rotation device 104 reaches the imaging start angle (step 507), the X-ray source 101 X-ray generation (step 508) and data collection of detector 102 (step 509) are started.
- the rotation start angle and the imaging start angle can be almost the same, the surgeon
- the measurement can be started at the same time when the start button is pressed, and the image can be measured without a time lag when the contrast medium flows.
- the control processing device 107 stores the rotation angle information from which the measurement image has been captured (step 510).
- the control processing device 107 stops the X-ray generation and data collection.
- the rotation device 104 reaches the rotation end angle (step 512)
- the rotation measurement on the outward path ends (step 513).
- the control processing device 107 starts rotation of the rotating device 104 after the memorized interval time.
- the next rotation measurement is reversed (return rotation) with respect to the first outward rotation.
- the control processing unit 107 executes this series of rotation measurements for the stored number of repetitions (step 514).
- the control processing device 107 terminates the rotation measurement forcibly.
- the safety of the measurement can be improved by ending the measurement with a simple button operation. By generating weak X-rays during the interval time between rotation measurements and checking the image on the display device 112, measurement safety can be improved.
- the number of repetitions is 5 times
- the time required for one rotation measurement is 5 seconds
- the interval time between repeated measurements is 1 second.
- FIG. 6 shows another example of the measurement procedure.
- the control processing device 107 Set the rotation start angle, rotation end angle, shooting start angle, and shooting end angle (step 61).
- the control processing device 107 stores the number of repetitions of the rotation measurement in the storage device 113.
- the control processing device 107 stores the coordinates of the plurality of regions of interest set on the measurement image and the plurality of threshold values in each region in the storage device (step 602).
- the bed 106 is moved to adjust the position of the subject 110 (step 603).
- the control processing device 107 sets the strut 103 to the rotation start angle (steps 6 and 4).
- the operator presses the measurement start button attached to the control processing device 107.
- the X-ray source 101 generates weak X-rays (step 605), and the display device 112 displays the output of the detector in real time.
- the contrast medium injection device 108 injects a contrast medium into the blood vessel 111 of the subject 110 (step 606).
- the control processor 107 performs the following processing on the output image of the detector 102. If the signal intensity decreases as the X-ray absorption increases, the region of interest stored on the measurement image is set, the minimum value of the signal intensity in the region is calculated, and the minimum value is stored in the first reference stored in advance. Compare with the threshold (step 607).
- the control processing device 107 obtains rotation angle information of the rotation device 104 from the angle detection device 105, and the rotation device 104 sets the rotation start angle to the shooting start angle.
- X-ray generation of the X-ray source 101 (Step 610) and data collection of the detector 102 (Step 611) are started.
- the control processor 107 stores the rotation angle information from which the measurement image has been captured (step 612).
- the control device 107 detects the X-ray generation of the X-ray source 101 and the data collection of the detector 102. finish.
- the rotation device 104 reaches the rotation end angle (step 614), the rotation measurement in the forward path ends (step 615).
- a weak X-ray is generated from the X-ray source 101, and the following processing is performed on the output image of the detector 102 in the control processor 107. If the signal intensity decreases as the X-ray absorption increases, the region of interest stored on the measurement image is set, the minimum value of the signal intensity in the region is calculated, and the minimum value is stored in the second stored in advance. The rotation starts when the minimum value is greater than the second threshold value. If the signal intensity increases as the absorption of X-rays increases, the region of interest stored on the measurement image is set, the maximum value of the signal intensity in the region is calculated, and the second value in which the maximum value is stored is calculated. The rotation starts when the maximum value is smaller than the second threshold value, compared with the threshold value.
- the next rotation measurement is reversed (return rotation) with respect to the first outward rotation.
- the control processing device 107 executes this rotation measurement for the stored number of repetitions.
- the X-ray source 101 does not generate weak X-rays.
- the control processing device 107 can store a threshold value for terminating the measurement.
- the minimum or maximum value calculated in the region of interest is compared with the threshold for ending the measurement, and the measurement is terminated when the minimum value becomes larger than the threshold value or when the maximum value becomes smaller. In this case, the control processing device 107 ends the measurement even if the number of repetitions has not been reached (step 616). Unnecessary measurement can be omitted by using the measurement termination threshold.
- the minimum value or the maximum value of the signal strength in the region of interest is used for the comparison processing in the control processing device 107, but the average value is used. It is also possible. By using the average value, even if the minimum value or the maximum value changes suddenly due to sudden reasons such as noise, measurement will not be affected.
- the control processing unit 107 controls the rotation output from the angle detection unit 105 when the X-ray source 101 generates X-rays or when the detector 102 captures measurement data.
- the angle information is stored.
- By performing the reconstruction process using the rotation angle information it is possible to reduce the blur component caused by the angle difference between the actual and the calculated values and improve the accuracy of the reconstructed image. Further, by performing the reconstruction process using the rotation angle information, a reconstructed image in the same direction can be created even when the rotation measurement start angles are different. As a result, when performing calculations between reconstructed images, angle alignment processing is not required, and processing can be sped up.
- the control processing device 107 performs a reconstruction process in each rotation measurement, and performs a difference process between the reconstructed images. At that time, the position is adjusted between the two reconstructed images. The difference processing is performed while changing the relative positional relationship between the two reconstructed images, and an arbitrary area is set on the difference reconstructed image. The error in the area is calculated, and the relative position where the error is minimized is detected. By performing the difference processing at the detected relative position, it is possible to avoid the occurrence of artifact due to the difference processing.
- Figure 7 shows a method for detecting the relative position using an arbitrary tomographic image.
- a tomographic image a702 parallel to the rotation plane of the X-ray tube such as a midplane image
- a tomographic image b704 that is parallel to the rotational plane of the X-ray source 101 and is equidistant from the rotational plane to the tomographic image a702 is selected.
- Tomographic image a 7 0 A difference image between 2 and the tomographic image b 704 is obtained. An arbitrary area is set on the difference image, and an error such as a standard deviation is calculated within the area in each difference image. The difference between all tomographic images is calculated at the angle where the error is minimized.
- the relative position is detected in a plurality of reconstructed images. For example, with respect to the reconstructed image A, the relative position of the reconstructed image B, the reconstructed C,... With respect to the reference reconstructed image A is determined. Adjust the position of each reconstructed image to the reference reconstructed image A. An arbitrary area is set on the reconstructed image, and an average value in the area is calculated for each reconstructed image. The horizontal axis plots the time relative to the start of contrast injection, and the vertical axis plots the average value in the area. Thereby, for example, a temporal change of the contrast agent in a certain blood vessel can be observed.
- the control processing device 10′7 can perform differential processing on measurement data between a plurality of rotation measurements and perform reconstruction processing, thereby obtaining a differential reconstructed image.
- the difference data is added to the measurement data inside the detector 102 and then input to the control processing device 107.
- the control processing device 107 stores angle information that causes the detector 102 to capture measurement data, and compares the rotation angle output from the angle detection device 105 with the stored rotation angle.
- the X-ray sources 1, 01 generate X-rays, and the detector 102 may capture measurement data.
- the control processing device 107 displays a plurality of difference reconstructed images on the same screen of the attached display device.
- the signal intensity of the reconstructed image indicates a change in the contrast agent concentration
- the plurality of reconstructed images indicate a change in the contrast agent concentration in each time phase.
- thresholding is performed on the reconstructed difference image, and coloring is performed according to the signal intensity. This makes it easier to understand the change.
- multiple differentiated reconstructions The image is processed with the same threshold, and a region having an arbitrary intensity is detected. The detected area is displayed in a different color for each reconstructed image, and then added and superimposed.
- the control processing device 107 can also display a plurality of reconstructed images created from the measurement data on the same screen of the attached display device.
- the signal intensity of the reconstructed image indicates the contrast agent concentration
- the plurality of reconstructed images indicate the contrast agent concentration at each time phase.
- the reconstructed image is displayed as a tomographic image, rendering image, or MIP image.
- the gaze direction, the rotation angle, the cut plane position, the threshold value, and the like are simultaneously changed. Observation can be facilitated by changing them at the same time.
- the present invention has been described by taking the C-arm type X-ray measuring device as an example, but the present invention can be similarly implemented in a gantry type X-ray measuring device.
- FIG. 8 shows a second embodiment, in which the column 103 of the X-ray measuring apparatus has a gantry shape.
- X-ray source 101 and detector 102 are installed in gantry 801.
- the gantry 801 is rotated by 360 ° around the subject 110 around the rotation axis 109 by the rotating device 104.
- the rotation axis 109 is generally parallel to the body axis of the subject 110 on the bed 106, but may be set obliquely.
- the gantry is supported from the floor, but it can be suspended from the ceiling. Since the column 103 has a gantry shape, it is possible to widen the rotation angle, rotate continuously in the same direction, and rotate at high speed. It is possible to measure more than 180 ° from any rotation angle.
- the X-ray measurement apparatus of the present embodiment can perform measurement by the measurement procedure shown in FIGS. 5 and 6 described above. Furthermore, in the measurement procedure of FIGS. 5 and 6 described above, the even-numbered measurement was inverted from the odd-numbered measurement, but in the embodiment of the gantry-type X-ray measurement apparatus, these measurements were performed. A measurement procedure can be performed by rotating in the same direction without inverting. Also, for a plurality of rotations, it is possible to set a different rotation start angle, rotation end angle, shooting start angle, and shooting end angle for each rotation. The above processing is performed on the measured data, and a three-dimensional image can be obtained and observed. In the X-ray measuring apparatuses of the first and second embodiments described above, an electrocardiograph is combined.
- the control processor 107 has a synchronizing signal generator, receives signals from the electrocardiograph, and generates a signal synchronized with the electrocardiographic signal.
- the control processing device 107 generates X-rays in the X-ray source 101 in accordance with the synchronization signal, and causes the detector 102 to read out. As a result, the accuracy of the three-dimensional reconstructed image can be improved in the vicinity of the heart.
- the present invention can be applied even when the contrast agent is not injected.
- an X-ray tube that generates X-rays for irradiating an inspection target
- an X-ray detector that detects measurement data regarding the inspection target
- an X-ray tube that detects measurement data regarding the inspection target
- an X-ray tube that detects measurement data regarding the inspection target
- an X-ray tube that detects measurement data regarding the inspection target
- an X-ray tube that detects measurement data regarding the inspection target
- an X-ray tube that detects measurement data regarding the inspection target
- an X-ray tube that detects measurement data regarding the inspection target
- an X-ray tube that detects measurement data regarding the inspection target
- an X-ray tube that detects measurement data regarding the inspection target
- an X-ray tube that detects measurement data regarding the inspection target
- an X-ray tube that detects measurement data regarding the inspection target
- an X-ray tube that detects measurement data regarding the inspection target
- an X-ray tube that detects measurement data regarding the inspection target
- an X-ray tube that detect
- the X-ray tube generates X-rays and the detector measures when making a forward rotation X-rays when the data is collected and the rotating device performs the backward rotation.
- the tube generates X-rays
- the detector collects the measurement data
- the control processor is the interval from the end of the forward rotation to the start of the backward rotation.
- control processing device has a storage device capable of setting a threshold value, sets an arbitrary region in an X-ray image composed of measurement data, Calculates the minimum value of the signal strength, compares the calculated minimum value with the threshold value, detects that the minimum value has exceeded the threshold value, and sets the interval time to automatically perform appropriate imaging
- the rotation measurement can be repeated at the timing of.
- the control processing device selects two forward or backward rotations from the two or more reciprocating rotations, reconstructs measurement data in each rotation, and executes the two forward or backward rotations. Change the relative position of the reconstructed image of rotation, perform difference processing between the two reconstructed images, set an arbitrary area on the difference reconstructed image, calculate the error in the area, and minimize the error
- the reconstructed images can be compared with high accuracy irrespective of unpredictable deviation between measurement data due to the deflection of the C-arm.
- control processing device performs a difference process after moving one of the two reconstructed images to a detected relative position to obtain a difference reconstructed image.
- the line measurement device eliminates the need to correct the deviation between the measurement data, which was required when calculating the difference reconstructed image by performing the difference processing between the measurement data. Image difference processing can be performed.
- the control processing device selects a tomographic image parallel to the rotation plane of the X-ray tube and equidistant from the rotation plane, from the selected reconstructed images of the two rotations,
- the position of the rotation axis of the X-ray tube is matched, the two tomographic images are relatively rotated about the position of the rotation axis, and the difference processing is performed between the two tomographic images.
- An arbitrary area is set on the tomographic image, the error in the area is calculated, the rotation angle at which the error is minimized is detected, and the difference processing of all the tomographic images is performed at the detected rotation angle, and the difference reconstructed image is obtained.
- the calculation can reduce the arithmetic processing and increase the processing speed as compared with the case where the relative position is detected using the entire reconstructed image.
- control processing device obtains a plurality of difference reconstructed images, performs a threshold process on each of the difference reconstructed images, and uses the threshold-processed difference reconstructed images in different colors.
- the control processing device obtains a plurality of difference reconstructed images, performs a threshold process on each of the difference reconstructed images, and uses the threshold-processed difference reconstructed images in different colors.
- the control processing device selects a reference reconstructed image from a plurality of reconstructed images and sets a relative error that minimizes an error in each reconstructed image with respect to the reference reconstructed image. Detect the target position, move each reconstructed image to the detected relative position, set an arbitrary area on the reconstructed image, and calculate the average value of the signal intensity in the area for each reconstructed image Thereby, a temporal change of the contrast agent in the region of interest of the subject can be observed.
- rotation measurement can be repeatedly performed at an appropriate contrast timing. This makes it possible to observe temporal changes in the contrast agent concentration. You can observe changes in blood flow. In addition, highly accurate 3D-DSA images can be obtained regardless of the arm deflection.
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Cited By (9)
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JP2007229254A (ja) * | 2006-03-01 | 2007-09-13 | Toshiba Corp | X線撮像装置及びその方法 |
JP2007244865A (ja) * | 2006-03-16 | 2007-09-27 | Siemens Ag | 身体部分における血管系の動脈および/または静脈の分離された3次元表示方法および装置 |
JP2009112532A (ja) * | 2007-11-06 | 2009-05-28 | Toshiba Corp | X線撮影装置及び磁気共鳴イメージング装置 |
JP2009240559A (ja) * | 2008-03-31 | 2009-10-22 | Toshiba Corp | X線診断装置、画像データ処理装置及び画像データ処理方法 |
JP2009257791A (ja) * | 2008-04-11 | 2009-11-05 | Sony Corp | X線断層撮像装置及びx線断層撮像方法 |
JP2012236066A (ja) * | 2012-08-08 | 2012-12-06 | Toshiba Corp | X線撮影装置及び磁気共鳴イメージング装置 |
JP2013503684A (ja) * | 2009-09-08 | 2013-02-04 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | X線装置 |
JP2015513431A (ja) * | 2012-03-06 | 2015-05-14 | コーニンクレッカ フィリップス エヌ ヴェ | 介入的x線かん流画像化のための定期的造影剤注射とハーモニクスの分析 |
JP2017056276A (ja) * | 2008-12-25 | 2017-03-23 | 信示 芦田 | X線診断装置 |
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JP2015513431A (ja) * | 2012-03-06 | 2015-05-14 | コーニンクレッカ フィリップス エヌ ヴェ | 介入的x線かん流画像化のための定期的造影剤注射とハーモニクスの分析 |
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JPWO2005044107A1 (ja) | 2007-08-23 |
JP4485474B2 (ja) | 2010-06-23 |
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