CN110772275B - CT scanning method, device and system based on ultrasound - Google Patents
CT scanning method, device and system based on ultrasound Download PDFInfo
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Abstract
The embodiment of the invention discloses a CT scanning method, a CT scanning device and a CT scanning system based on ultrasound, wherein the method comprises the following steps: acquiring blood flow information of a measured object through ultrasonic equipment; determining a scanning plan for scanning the target part according to the blood flow information; and based on the scanning plan, CT scanning is carried out on the target part of the tested object. The embodiment of the invention provides a data basis for CT scanning planning through blood flow information measured by ultrasonic equipment, solves the problem of higher radiation dose and contrast agent dose in the existing CT scanning process, and realizes accurate CT scanning of the target part of the measured object under the condition of using standard level radiation dose and contrast agent dose.
Description
Technical Field
The embodiment of the invention relates to the technical field of medical imaging, in particular to a CT scanning method, device and system based on ultrasound.
Background
The CT scanning mode is a mode of carrying out CT scanning after intravenous injection of a certain dose of iodine-containing water-soluble contrast agent, and the intravenous injection of the CT contrast agent can effectively increase the density difference between normal tissues and focus tissues of an observation part, thereby improving the display degree of focus tissues. CT scanning methods are widely used in the field of medical imaging, where it is important to accurately obtain the time for a CT contrast agent to reach a target site after it has been injected.
Because of the individual differences of different detected objects, the time for the contrast agent to reach the target observation position is not fixed, and in order to accurately acquire the time for the contrast agent to reach the target position, a bolus tracking technology and a CT scanning technology are combined in the prior art to obtain the action time of the contrast agent of different individuals, so as to obtain the time for CT scanning the target position. Among the bolus tracking techniques are bolus contrast agent tracking techniques and small dose bolus tracking techniques.
Bolus contrast agent tracking techniques image tissue by means of CT scanning, which is performed when the contrast agent content of the target site reaches a threshold value, but this approach increases the radiation dose of the CT scan. The small-dose bolus tracking technology also needs to image tissues by means of CT scanning, and obtains the time for the contrast agent to reach a target position by injecting the small-dose CT contrast agent in advance, so that the time of CT scanning is obtained, but the method not only can increase the radiation dose of CT scanning, but also can increase the using dose of the CT contrast agent. In the above prior art, in order to accurately acquire the time of CT scanning the target portion, the radiation dose and the contrast agent dose of the CT scanning are both higher than the standard level.
Disclosure of Invention
The embodiment of the invention provides an ultrasonic-based CT scanning method, device and system, which are used for realizing accurate CT scanning of a target part under the condition of using lower radiation dose and contrast agent dose.
In a first aspect, an embodiment of the present invention provides an ultrasound-based CT scanning method, including:
acquiring blood flow information of a measured object through ultrasonic equipment;
determining a scanning plan for scanning the target part according to the blood flow information;
and based on the scanning plan, CT scanning is carried out on the target part of the tested object.
In a second aspect, an embodiment of the present invention further provides an ultrasound-based CT scanning apparatus, including:
the blood flow information acquisition module is used for acquiring blood flow information of the tested object through the ultrasonic equipment;
the scanning plan determining module is used for determining a scanning plan of the CT scanning target part according to the blood flow information;
and the CT scanning module is used for carrying out CT scanning on the target part of the tested object based on the scanning plan.
In a third aspect, embodiments of the present invention also provide an ultrasound-based CT scanning system, the system comprising:
the ultrasonic equipment is used for acquiring blood flow information of the tested object;
the CT scanning device is used for acquiring CT scanning images;
the CT contrast agent is used for improving the display degree of CT scanning images of the target part;
a processor for performing an ultrasound-based CT scanning method as described in any of the above references.
In a fourth aspect, embodiments of the present invention also provide a storage medium containing computer executable instructions for performing any of the ultrasound-based CT scanning methods referred to above when executed by a computer processor.
The embodiment of the invention provides a data basis for CT scanning planning through blood flow information measured by ultrasonic equipment, solves the problem of higher radiation dose and contrast agent dose in the existing CT scanning process, and realizes accurate CT scanning of the target part of the measured object under the condition of using standard level radiation dose and contrast agent dose.
Drawings
Fig. 1 is a flowchart of an ultrasound-based CT scanning method according to an embodiment of the present invention.
Fig. 2 is a flowchart of a CT scanning method based on ultrasound according to a second embodiment of the present invention.
Fig. 3 is a schematic diagram of an ultrasound-based CT scanning apparatus according to a third embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an ultrasound-based CT scanning system according to a fourth embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a flowchart of an ultrasound-based CT scanning method according to an embodiment of the present invention, where the method may be performed by an ultrasound-based CT scanning device, and the device may be implemented in software and/or hardware. The method specifically comprises the following steps:
s110, blood flow information of the tested object is obtained through ultrasonic equipment.
Wherein, the ultrasonic device refers to a medical instrument developed by utilizing the physical characteristics of ultrasonic waves and applied to the field of medical and health for diagnosing and treating diseases. The ultrasonic wave refers to an acoustic wave with the frequency being more than 20kHz, has the characteristics of directional property and strong penetrating power, and is generally applied to medical diagnosis, and the ultrasonic frequency is 1MHz-5MHz. The detection principle of medical ultrasonic equipment is that after ultrasonic waves are transmitted to a human body by utilizing the reflection characteristics of different tissues when the acoustic waves propagate in the human body, whether the checked organ is normal or not is diagnosed according to echo signals received by an ultrasonic probe. According to the display types of ultrasonic echo signals, ultrasonic devices can be mainly classified into a type-a ultrasonic device, a type-B ultrasonic device, an M ultrasonic device, and a type-D ultrasonic device, wherein the type-D ultrasonic device is an ultrasonic device for detecting blood flow in a human body using a doppler principle, and is also called a doppler ultrasonic device. In one embodiment, blood flow information of the subject is acquired by a D-mode ultrasound device.
In one embodiment, optionally, blood flow information of at least one preset site of the object to be measured by the ultrasound device. The predetermined portion may be an injection portion, a target portion, or any portion from the injection portion to the target portion, and is not limited herein. Exemplary blood flow information includes, but is not limited to, blood flow rate, blood flow direction, and blood flow echo signals, among others.
S120, determining a scanning plan for scanning the target part according to the blood flow information.
Improving the image quality of an enhanced CT scan is critical to medical diagnostic procedures, but enhanced CT scans are often affected by a variety of factors, so making a scan plan prior to performing a CT scan can help improve the image quality of a CT scan, and can also reduce the radiation dose and ultrasound contrast agent dose that the enhanced CT scan brings. In one embodiment, optionally, the scan plan includes at least one of a delay time, a monitored site, a contrast amount of the CT contrast agent, and an injection rate of the CT contrast agent.
The delay time is a time from the start of injection of the CT contrast agent to the time when the contrast agent reaches the target site through the blood circulation. In one embodiment, when the blood flow information includes a blood flow rate, optionally, a length of a blood vessel from the injection site to the target site is determined, and a delay time for scanning the target site is determined based on the length of the blood vessel and the blood flow rate. The length of the blood vessel can be estimated according to the physical conditions of different patients, the blood vessel can be imaged by using imaging equipment, and the length of the blood vessel is calculated according to the imaging result.
In one embodiment, optionally, a total length of the blood vessel from the injection site to the target site is determined, and a delay time for scanning the target site is determined based on the total length of the blood vessel and the blood flow rate. From the injection site to the target site, the type of blood vessel through which blood flows may be more than one. Where the total length of the vessel refers to the total length of all types of vessels through which blood flows between the injection site and the target site. The blood flow rate may be the blood flow rate from the injection site to any vascular site between the target site, or may be the blood flow rate from the injection site or the target site. For example, the total length of the blood vessel from the injection site to the target site is l, the blood flow velocity at a certain blood vessel position is v, and the delay time t of scanning the target site is calculated according to the formula t=l/v. The advantage of this arrangement is that the delay time for scanning the target site can be determined by acquiring a blood flow rate by the ultrasound device, simplifying the scanning procedure.
In one embodiment, optionally, at least two vessel lengths from the injection site to the target site are determined, and a delay time for scanning the target site is determined based on the at least two vessel lengths and a blood flow rate corresponding to the vessel lengths. Any one of the at least two blood vessel lengths may include at least one blood vessel type, that is, for a certain blood vessel length, the blood vessel length of a certain type of blood vessel may be the total length of a blood vessel formed by a plurality of types of blood vessels. The blood flow rate corresponding to the length of the blood vessel refers to the flow rate of blood flowing through any location within the corresponding length of the blood vessel. For example, the injection site is a left arm vein, the target site is a brain, and the blood flow velocity v of the left arm vein is obtained from the injection site to the target site through the left arm vein and the carotid vein by ultrasonic equipment 1 And neckArterial vessel blood flow velocity v 2 And determining the vessel length l of the left arm vein vessel 1 And vessel length of carotid vessel l 2 According to formula t 1 ＝l 1 /v 1 Calculating the time t of flowing through the vein of the left arm 1 According to formula t 2 ＝l 2 /v 2 Calculating the time t of flowing through the vein of the left arm 2 According to the formula t=t 1 +t 2 And calculating to obtain the delay time t of the scanning target part. The advantage of this is that the accuracy of the delay time can be improved by calculating the blood flow time of the different blood vessels separately, since the blood flow rate in the different blood vessels may be different, as a result of the multiple blood vessels that may pass from the injection site to the target site.
Wherein the monitoring site refers to a reference site from the injection site to before reaching the target site. Since the preparation time of CT scanning exists between the opening of the CT equipment and the scanning of the CT equipment, the monitoring part is added in the scanning plan, and the CT scanning equipment can be opened when the CT contrast agent reaches the monitoring part, thereby avoiding the influence of the preparation time of CT scanning on the scanning result and improving the quality of CT scanning. In one embodiment, optionally, the monitored portion of the CT scan target portion is determined based on the delay time, the preparation time of the CT scan, and the blood flow rate. For example, the delay time t from the injection site to the target site is calculated by the technical method described in the above embodiment, assuming that the preparation time of the CT scan is t m The velocity of blood is v, according to formula t c ＝t-t m Calculating the time t from the injection site to the monitoring site c According to the formula l=v×t c The blood vessel distance l between the monitoring part and the target part is calculated, so that the position of the monitoring part is determined.
S130, CT scanning is carried out on the target part of the tested object based on the scanning plan.
In one embodiment, optionally, the scan plan includes at least one of a delay time, a monitored site, a contrast amount of the CT contrast agent, and an injection rate of the CT contrast agent. In one embodiment, the contrast agent amount of the CT contrast agent and the injection speed of the CT contrast agent may be alternatively calculated according to the physical condition of different patients.
Wherein, when the scan plan includes a delay time, after the injection of the CT contrast media, in one embodiment, optionally, after the delay time, a CT scan is performed on the target site of the subject.
Wherein, when the scan plan includes a monitored site, after injection of the CT contrast agent, in one embodiment, optionally, a time t is elapsed for the CT contrast agent to reach the monitored site c And then, opening the CT scanning equipment to perform CT scanning on the target part of the tested object.
According to the technical scheme, the blood flow information measured by the ultrasonic equipment provides a data basis for CT scanning planning, the problem that the radiation dose and the contrast agent dose in the existing CT scanning process are high is solved, and accurate CT scanning of the target part of the measured object is achieved under the condition that the standard level radiation dose and the standard level contrast agent dose are used.
Example two
Fig. 2 is a flowchart of an ultrasound-based CT scanning method according to a second embodiment of the present invention, and the technical solution of this embodiment is further refinement based on the foregoing embodiment. Optionally, before the blood flow information of the tested object is acquired by the ultrasonic equipment, the method further comprises: an ultrasound contrast agent or a CT contrast agent containing air bubbles is injected into a subject.
The specific implementation steps of the embodiment include:
s210, injecting an ultrasonic contrast agent or a CT contrast agent containing bubbles into a tested object.
Among them, ultrasound contrast agents are a type of medical agent currently used in medical ultrasound contrast imaging, typically consisting of encapsulated micron-sized bubbles. On the basis of conventional ultrasonic detection, the blood flow echo signal of a human body can be enhanced by intravenous injection of an ultrasonic contrast agent, and microvascular perfusion information of tissues is observed dynamically in real time, so that the signal-to-noise ratio and the resolution of an ultrasonic image are improved. As the main component of the ultrasonic contrast agent is micron-sized bubbles, the effect of enhancing the blood flow echo signals of a human body can be achieved by adding the bubbles into the CT contrast agent. The blood flow echo signal refers to an echo signal generated by back scattering of blood flow received by ultrasonic equipment.
S220, blood flow information of the tested object is obtained through the ultrasonic equipment.
In one embodiment, the blood flow information may optionally include, but is not limited to, blood flow rate, blood flow volume, blood flow direction, and blood flow echo signals.
S230, determining a scanning plan for scanning the target part according to the blood flow information.
In one embodiment, the scan plan optionally includes at least one of a delay time, a monitored site, a time of occurrence of a vascular phase, a contrast amount of the CT contrast agent, and an injection rate of the CT contrast agent.
In one embodiment, optionally, the delay time for scanning the target site is determined from changes in the blood flow echo signal at the target site. Because the ultrasonic contrast agent or the CT contrast agent containing air bubbles can enhance the intensity of the blood flow echo signal, when the ultrasonic equipment detects that the blood flow echo signal of the target part changes, the ultrasonic contrast agent or the CT contrast agent containing air bubbles can flow through the target part. The time from the injection of the contrast medium to the detection of the change in the echo signal of the blood flow at the target site is defined as the delay time for scanning the target site.
Wherein the vascular phase comprises arterial phase, venous phase and equilibrium phase. The arterial phase or venous phase refers to a period in which the contrast agent flows through an artery or vein of a target site, and the equilibrium phase refers to a period in which distribution of the contrast agent inside and outside a blood vessel is in an equilibrium state. The time of occurrence of the vascular phase refers to the time from the injection of the contrast agent until the contrast agent reaches the artery, vein or equilibrium phase of the target site. In one embodiment, optionally, a vessel phase of the target site is determined based on the blood flow information, and a contrast agent amount and an injection rate of the CT scan of the target site are determined based on the vessel phase.
Wherein, in one embodiment, optionally, the vessel phase of the target site is determined according to the blood flow echo signal. When the target site is in different vascular phases after injection of the contrast agent, the blood flow echo signals detected by the ultrasound device exhibit different echo signal characteristics. There may be differences in the blood flow echo signals exhibited by different types of target sites at different vascular phases. In one embodiment, optionally, the vascular phase of the target site is determined based on the blood flow echo signal and the type of target site. For example, when the target site is a liver cancer site, the contrast agent reaches the arterial phase, the blood flow echo signal exhibits a fully enhanced signal characteristic, and the venous phase and the equilibrium phase exhibit a hypoechoic signal characteristic. When the target site is a regenerative nodule in the liver, the blood flow echo signal exhibits a uniformly enhanced signal characteristic during the portal period and an isoechoic signal characteristic during the equilibrium period.
The occurrence time of the vascular phase is closely related to the contrast agent amount and the injection speed. In one embodiment, optionally, the detected time of occurrence of the vascular phase is compared with the time of occurrence of the standard vascular phase according to the correspondence between the time of occurrence of the standard vascular phase and the contrast agent dose and the injection speed, and the contrast agent dose and the injection speed are reduced when the detected time of occurrence of the vascular phase is earlier, and correspondingly, the contrast agent dose and the injection speed are increased when the detected time of occurrence of the vascular phase is later.
S240, CT scanning is carried out on the target part of the tested object based on the scanning plan.
In one embodiment, when injecting an ultrasound contrast agent into a subject, the scan plan includes at least one of a delay time, a monitored site, a time of occurrence of a vascular phase, a contrast agent amount of a CT contrast agent, and an injection rate of the CT contrast agent. In one embodiment, the contrast agent of the CT contrast agent may be a contrast agent calculated according to the physical condition of different patients, or may be a contrast agent determined according to the occurrence time of the vascular phase. In one embodiment, the injection speed of the CT contrast agent may be calculated according to the physical condition of different patients, or may be determined according to the occurrence time of the vascular phase, or may be an injection speed consistent with the injection speed of the ultrasound contrast agent.
Wherein, when the scan plan includes a delay time or an occurrence time of a vascular phase, after injecting the CT contrast medium, in one embodiment, optionally, the target portion of the object to be measured is CT-scanned when the delay time or the occurrence time of the vascular phase is reached. Further, in one embodiment, optionally, the preparation time of the CT scan is subtracted from the delay time or the appearance time of the vascular phase to obtain a corresponding preparation start time, and when the preparation start time is reached, the CT scanning device is turned on to perform the CT scan on the target portion of the measured object.
Wherein, when the scan plan includes a monitored site, after injection of the CT contrast agent, in one embodiment, optionally, the time t for the CT contrast agent to reach the monitored site is based on c And opening the CT scanning equipment to perform CT scanning on the target part of the tested object.
In one embodiment, the scan plan includes a monitored site when a CT contrast agent containing air bubbles is injected into the subject, and after the CT contrast agent containing air bubbles is injected, in one embodiment, optionally, the CT scanning device is turned on to perform CT scan on a target site of the subject when a blood flow echo signal of the monitored site changes.
According to the technical scheme, the problem that the radiation dose and the contrast agent dose are high in the existing CT scanning process is solved by injecting the ultrasonic contrast agent or the CT contrast agent containing bubbles, and under the condition that the standard level radiation dose and the standard level contrast agent dose are used, the accuracy of a CT scanning plan is further improved, so that accurate CT scanning of a target part of a measured object is achieved.
Example III
Fig. 3 is a schematic diagram of an ultrasound-based CT scanning apparatus according to a third embodiment of the present invention. The embodiment can be applied to the condition that the ultrasonic equipment guides CT scanning, and the device can be realized in a software and/or hardware mode. The ultrasound-based CT scanning apparatus includes a blood flow information acquisition module 310, a scan plan determination module 320, and a CT scanning module 330.
The blood flow information obtaining module 310 is configured to obtain blood flow information of the measured object through the ultrasonic device;
a scan plan determining module 320, configured to determine a scan plan of the CT scan target site according to the blood flow information;
the CT scanning module 330 is configured to perform CT scanning on a target portion of the measured object based on the scanning plan.
According to the technical scheme, the blood flow information measured by the ultrasonic equipment provides a data basis for CT scanning planning, the problem that the radiation dose and the contrast agent dose in the existing CT scanning process are high is solved, and accurate CT scanning of the target part of the measured object is achieved under the condition that the standard level radiation dose and the standard level contrast agent dose are used.
On the basis of the above technical solution, optionally, the apparatus further includes:
and the contrast agent injection module is used for injecting ultrasonic contrast agent or CT contrast agent containing bubbles into the tested object.
On the basis of the above aspects, the scan plan includes at least one of a delay time, a monitoring site, a contrast agent amount, and an injection speed.
Based on the above aspects, the scan plan determining module 320 includes:
a first delay time determining unit for determining at least one blood vessel length from the injection site to the target site, and determining a delay time for scanning the target site based on the at least one blood vessel length and a blood flow rate corresponding to the blood vessel length.
Based on the above aspects, the scan plan determining module 320 includes:
and the second delay time determining unit is used for determining the delay time for scanning the target part according to the change of the blood flow echo signal of the target part.
Based on the above technical solutions, the scan plan determining module 320 is specifically configured to:
and determining the monitoring part of the CT scanning target part according to the delay time, the preparation time of the CT scanning and the blood flow velocity.
Based on the above technical solutions, the scan plan determining module 320 is specifically configured to:
determining a vascular phase of the target part according to the blood flow information;
based on the phase of the vessel, the contrast agent amount and the injection speed of the CT scanning target part are determined.
The CT scanning device based on the ultrasound provided by the embodiment of the invention can be used for executing the CT scanning method based on the ultrasound provided by the embodiment of the invention, and has the corresponding functions and beneficial effects of the executing method.
It should be noted that, in the above embodiment of the ultrasound-based CT scanning apparatus, each unit and module included are only divided according to the functional logic, but are not limited to the above division, so long as the corresponding functions can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Example IV
Fig. 4 is a schematic structural diagram of an ultrasound-based CT scanning system according to a fourth embodiment of the present invention, which provides services for implementing the ultrasound-based CT scanning method according to any one of the above embodiments of the present invention, and the ultrasound-based CT scanning apparatus according to the above embodiments of the present invention may be configured.
The system comprises an ultrasound device 40, a CT scanning device 41, a CT contrast agent 42 and a processor 43. Wherein, the ultrasonic device 40 is used for acquiring blood flow information of the tested object; a CT scanning device 41 for acquiring a CT scan image; a CT contrast medium 42 for improving the display of CT scan images of the target region; a processor 43 for performing the ultrasound-based CT scanning method described above.
In one embodiment, optionally, the system further comprises an ultrasound contrast agent for enhancing the blood flow echo signal.
The number of processors 43 in the system may be one or more, one processor 43 being taken as an example in fig. 4; the ultrasound device 40, the CT scanning device 41 and the processor 43 in the system may be connected by a bus or other means, fig. 4 being an example of a connection by a bus.
In one embodiment, optionally, the system further comprises a memory. The memory, as a computer readable storage medium, may be used to store software programs, computer executable programs, and modules, such as program instructions/modules (e.g., blood flow information acquisition module 310, scan plan determination module 320, and CT scan module 330) corresponding to an ultrasound-based CT scan method in an embodiment of the present invention. The processor 43 executes various functional applications and data processing by running software programs, instructions and modules stored in the memory, i.e. implements the ultrasound-based CT scanning method described above.
The memory may mainly include a memory program area and a memory data area, wherein the memory program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the terminal, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, the memory may further include memory remotely located relative to the processor 43, which may be connected to the processor 43 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
By the CT scanning system based on ultrasound, the problem that the radiation dose and the contrast agent dose in the existing CT scanning process are high is solved, and accurate CT scanning of a target part of a measured object is realized under the condition that the standard level radiation dose and the standard level contrast agent dose are used.
Example five
A fifth embodiment of the present invention also provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are for performing an ultrasound-based CT scanning method, the method comprising:
acquiring blood flow information of a measured object through ultrasonic equipment;
determining a scanning plan for scanning the target part according to the blood flow information;
based on the scan plan, CT scan is performed on the target portion of the object to be measured.
The computer storage media of embodiments of the invention may take the form of any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present invention may be written in one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
Of course, the storage medium containing computer executable instructions provided in the embodiments of the present invention is not limited to the above method operations, but may also perform the related operations in the ultrasound-based CT scanning method provided in any of the embodiments of the present invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. An ultrasound-based CT scanning method, comprising:
acquiring blood flow information of a measured object through ultrasonic equipment;
determining a scanning plan for scanning the target part according to the blood flow information;
CT scanning is carried out on the target part of the tested object based on the scanning plan;
wherein the scan plan includes at least one of a delay time, a monitored site, a contrast amount of a CT contrast agent, and an injection rate of the CT contrast agent;
the determining a scan plan for scanning the target part according to the blood flow information comprises the following steps:
determining at least two blood vessel lengths from an injection site to the target site, determining a delay time for scanning the target site based on the at least two blood vessel lengths and a blood flow rate corresponding to the blood vessel lengths;
the method for determining the scanning plan of the CT scanning target part according to the blood flow information further comprises the following steps:
determining a time from an injection site to a monitoring site according to the delay time and a preparation time of CT scanning, determining a position of the monitoring site according to the time from the injection site to the monitoring site and the blood flow rate, and opening a CT scanning device when a CT contrast medium reaches the monitoring site; wherein the monitoring site is a reference site before reaching the target site from the injection site.
2. The method of claim 1, further comprising, prior to acquiring blood flow information of the subject by the ultrasound device:
an ultrasound contrast agent or a CT contrast agent containing air bubbles is injected into a subject.
3. The method of claim 1, wherein determining a scan plan for scanning a target site based on the blood flow information comprises:
a length of a blood vessel from the injection site to the target site is determined, and a delay time for scanning the target site is determined based on the length of the blood vessel and the blood flow rate.
4. The method of claim 1, wherein determining a scan plan for a CT scan target site based on the blood flow information comprises:
and determining the delay time for scanning the target part according to the blood flow echo signal of the target part.
5. The method of claim 1, wherein determining a scan plan for a CT scan target site based on the blood flow information comprises:
determining a vascular phase of the target part according to the blood flow information;
and determining the contrast agent quantity and the injection speed of the CT scanning target part according to the vascular phase.
6. An ultrasound-based CT scanning apparatus, comprising:
the blood flow information acquisition module is used for acquiring blood flow information of the tested object through the ultrasonic equipment;
the scanning plan determining module is used for determining a scanning plan of the CT scanning target part according to the blood flow information;
the CT scanning module is used for carrying out CT scanning on the target part of the tested object based on the scanning plan;
wherein the scan plan includes at least one of a delay time, a monitored site, a contrast amount of a CT contrast agent, and an injection rate of the CT contrast agent;
the scan plan determining module is further configured to determine at least two blood vessel lengths from an injection site to the target site, and determine a delay time for scanning the target site according to the at least two blood vessel lengths and a blood flow rate corresponding to the blood vessel lengths;
the scanning plan determining module is further used for determining the time from the injection site to the monitoring site according to the delay time and the preparation time of CT scanning, determining the position of the monitoring site according to the time from the injection site to the monitoring site and the blood flow rate, and opening the CT scanning equipment when the CT contrast medium reaches the monitoring site; wherein the monitoring site is a reference site before reaching the target site from the injection site.
7. An ultrasound-based CT scanning system, comprising:
the ultrasonic equipment is used for acquiring blood flow information of the tested object;
the CT scanning device is used for acquiring CT scanning images;
the CT contrast agent is used for improving the display degree of CT scanning images of the target part;
a processor for performing the ultrasound-based CT scanning method of any of claims 1-5.
8. The system of claim 7, further comprising:
an ultrasound contrast agent for enhancing blood flow echo signals.
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