CN103385729A - Scanning method of CT (computer tomography) scout view - Google Patents
Scanning method of CT (computer tomography) scout view Download PDFInfo
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- CN103385729A CN103385729A CN201210138231XA CN201210138231A CN103385729A CN 103385729 A CN103385729 A CN 103385729A CN 201210138231X A CN201210138231X A CN 201210138231XA CN 201210138231 A CN201210138231 A CN 201210138231A CN 103385729 A CN103385729 A CN 103385729A
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Abstract
The invention discloses a scanning method of a CT (computer tomography) scout view. The scanning method comprises the following steps of rotating a CT bulb tube frame for an angle beta, and positioning a focus of a bulb tube just above the center of a to-be-scanned target area; further, during scanning, obtaining the accurate position of the target area in the X-axis direction or the Y-axis direction; and obtaining the rotation angle beta through a calculation formula, i.e. beta=arcsin (D/R), wherein D represents the distance from the center of the target area to the rotation center of the bulb tube, and R represents the distance from the focus of the bulb tube to the rotation center of the bulb tube. The scanning method of the CT scout view has the advantage that the CT bulb tube frame is rotated for the angle, the focus of the bulb tube is positioned just above the center of the to-be-scanned target area, further the accurate position of the target area in the X-axis direction or the Y-axis direction is obtained during scanning, and the geometric error of the center position of a ray beam in the target area caused by the ray beam is zero, so the scouting of the CT scout view in the target area is accurate.
Description
Technical field
The present invention relates to the medical image processing technical field, particularly a kind of CT locates the scan method of picture.
Background technology
Existing CT(Computer Tomography, x-ray computer calculate layer radiography) the location picture scanning bulb that usually all will produce x-ray be fixed on above patient or side so that patient is scanned.Fig. 1 is that the CT bulb is fixed in patient's when top X ray and passes patient's schematic diagram, and wherein large ellipse represents patient a, and little ellipse represents target area A to be scanned.Join shown in Figure 1ly, beam, except having along perpendicular to patient place in-plane, passing the ray of patient a, also has along and perpendicular to patient place in-plane, becomes a drift angle γ to pass the ray of target area A to be scanned.Be fixed in patient's top due to the CT bulb, the bulb focal point F be positioned at bulb center of rotation O directly over, be d when ray passes the distance of patient Shi Qi on the Y-direction on plane, patient place, the error of its introducing of directions X on plane, patient place is dtan γ, and then cause the location picture inaccurate in the directions X location to target area A to be scanned, cause the image of the target area A of imaging to be scanned deviation to occur, affect the scanning judgement that the doctor treats scanning area, finally cause target area to be scanned imaging failure.
Summary of the invention
The invention provides the scan method of a kind of CT location picture, with solve by drift angle cause to the inaccurate problem of target localization zone location.
For solving the problems of the technologies described above, the invention provides the scan method of a kind of CT location picture, comprise the following steps: with CT bulb frame rotation one angle beta make the focus of bulb be positioned at zone to be scanned the center, target area directly over, and then in when scanning, obtain this target area at the accurate location on directions X or on Y-direction, the angle of described rotation is passed through computing formula
Obtain, wherein, D represents the distance of the center of target area to be scanned to the bulb center of rotation, and R represents the distance between described bulb focus and described bulb center of rotation.
Preferably, described bulb is not more than near above the target area in zone to be scanned in the angle of scan vision and carries out the scanning of multiple bearing picture.
Preferably, the scanning dose of described multiple bearing picture scanning is to shield the x ray by gate to control.
Preferably, the beam of described CT location picture scanning passes the target area in described zone to be scanned along Y-direction.
Preferably, the beam of described CT location picture scanning passes the target area in described zone to be scanned along directions X.
Owing to having adopted above technical scheme, compared with prior art, the present invention has the following advantages:
The scan method of CT provided by the invention location picture with CT bulb frame rotation one angle make the focus of bulb be positioned at zone to be scanned the center, target area directly over, and then obtain this target area at the accurate location on directions X or on Y-direction when scanning, making the geometric error that the center of beam is caused by beam in target area is zero, makes the accurate positioning of CT location picture in target area.
Further, the scanning dose of described multiple bearing picture scanning is to shield the x ray by gate to control, and can reduce the dosage of each corresponding each scanning in target area.
Description of drawings
Fig. 1 is that the CT bulb is fixed in patient's when top X ray and passes the schematic diagram in zone to be scanned;
Fig. 2 be first embodiment of the invention CT equipment when treating scanning area and carrying out a bulb drift angle degree scanning beam pass the schematic diagram of target area A to be scanned;
Fig. 3 when to be second embodiment of the invention CT equipment carry out repeatedly the scanning of bulb drift angle degree to patient beam pass the schematic diagram of target area to be scanned.
The specific embodiment
Be described in further detail below in conjunction with the scan method of the drawings and specific embodiments to the CT location picture of the present invention's proposition.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only is used for convenient, the purpose of the aid illustration embodiment of the present invention lucidly.
Core concept of the present invention is, the scan method of a kind of CT location picture is provided, with CT bulb frame rotation one angle make the focus of bulb be positioned at center, target area to be scanned directly over, and then in when scanning, obtain this target area at accurate location on directions X or on Y-direction, making the geometric error that is caused by beam in the center, target area is zero, makes the accurate positioning of CT location picture in target area.
Embodiment one
The scan method of the CT location picture that the embodiment of the present invention provides, comprise the following steps: with CT bulb frame rotation one angle beta make the focus of bulb be positioned at zone to be scanned the center, target area directly over, and then in when scanning, obtain this target area at the accurate location on directions X or on Y-direction, the angle beta of described rotation passes through computing formula
Obtain, wherein, D represents the distance of the center of described target area to be scanned to the bulb center of rotation, and R represents the distance between described bulb focus and described bulb center of rotation.
Further, the beam of described CT location picture scanning passes the target area in described zone to be scanned along directions X or Y-direction, and described bulb is not more than near above the target area in zone to be scanned in the angle of scan vision and carries out the scanning of multiple bearing picture.In the present embodiment, pass described target area take described beam along Y-direction and set forth as example, Fig. 2 be first embodiment of the invention CT equipment when treating scanning area and carrying out a bulb drift angle degree scanning beam pass the schematic diagram of target area A to be scanned.With reference to Fig. 2, large elliptic region represents the residing environment of target area A, and little ellipse represents target area A, the bulb focal point F be positioned at bulb center of rotation O directly over,, with CT bulb frame anglec of rotation β, make the position change of bulb focus and move to focal point F 1 place in figure.Distance between bulb focal point F and bulb center of rotation O is R, and the center of target area A is to the distance D of bulb center of rotation O, namely
The beam of focal point F 1 correspondence has been eliminated and has been passed the inclined to one side value that target area A exists, and makes the focal point F 1 that adopts after adjusting can make the location of target area A more accurate.The center of target area can obtain by measurement according to the center of rotation of regional center to be scanned and bulb.
Embodiment two
Identical with embodiment one, still take beam, to pass in the y-direction described target area and set forth as example, the scanning of described CT location picture comprises a plurality of target areas, the scanning dose of described multiple bearing picture scanning is to shield the x ray by gate to control.In the present embodiment, the quantity of a plurality of target areas is 3, it will be understood by those skilled in the art that this quantity is not limited to the present invention.Fig. 3 when to be second embodiment of the invention CT equipment carry out repeatedly the scanning of bulb drift angle degree to patient beam pass the schematic diagram of target area to be scanned.Referring to Fig. 3, large elliptic region represents target area A, target area B and the residing environment of target area C, three little ellipses represent respectively target area A, target area B and target area C, the beam of focal point F 1 correspondence passes target area A, bulb focus (not shown in FIG.) in focal point F 1 correspondence is determined the position of focal point F 1 by rotation CT bulb frame, the beam of this focal point F 1 correspondence has been eliminated and has been passed the inclined to one side value that target area A exists, and focal point F 1 can make the location of target area A more accurate; Beam corresponding to focal point F passes target area B, determine the position of focal point F by rotation CT bulb frame in the bulb focus (not shown in FIG.) that focal point F is corresponding, the center of target area B is bulb center of rotation O, focal point F be positioned at bulb center of rotation O directly over, beam corresponding to this focal point F eliminated and passed the inclined to one side value that target area B exists, and focal point F can make the location of target area B more accurate; Equally, the beam of focal point F 2 correspondences passes target area C, bulb focus (not shown in FIG.) in focal point F 2 correspondences is determined the position of focal point F 2 by rotation CT bulb frame, the beam of these focal point F 2 correspondences has been eliminated and has been passed the inclined to one side value that target area C exists, and focal point F 2 can make the location of target area C more accurate.Therefore, accurate location for the multiple target zone can make the location, environmental area at place, whole target area more accurate, simultaneously, the scanning dose of described multiple bearing picture scanning is to shield the x ray by gate to control, and can reduce the dosage of each corresponding each scanning in target area.
Although the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.The persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (5)
1. the scan method of CT location picture, it is characterized in that, comprise: with CT bulb frame rotation one angle beta make the focus of bulb be positioned at zone to be scanned the center, target area directly over, and then in when scanning, obtain this target area at the accurate location on directions X or on Y-direction, the angle beta of described bulb frame rotation passes through computing formula
Obtain, wherein, D represents the distance of the center of target area to be scanned to the bulb center of rotation, and R represents the distance between described bulb focus and described bulb center of rotation.
2. the scan method of CT as claimed in claim 1 location picture, is characterized in that, described bulb is not more than near above the target area in zone to be scanned in the angle of scan vision and carries out the scanning of multiple bearing picture.
3. CT as claimed in claim 2 locates the scan method of picture, it is characterized in that, the scanning dose of described multiple bearing picture scanning is to shield the x ray by gate to control.
4. CT as claimed in claim 1 locates the scan method of picture, it is characterized in that, the beam of described CT location picture scanning passes the target area in described zone to be scanned along Y-direction.
5. CT as claimed in claim 1 locates the scan method of picture, it is characterized in that, the beam of described CT location picture scanning passes the target area in described zone to be scanned along directions X.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210138231XA CN103385729A (en) | 2012-05-07 | 2012-05-07 | Scanning method of CT (computer tomography) scout view |
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| CN201210138231XA CN103385729A (en) | 2012-05-07 | 2012-05-07 | Scanning method of CT (computer tomography) scout view |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061524A (en) * | 1990-11-19 | 1992-06-03 | 通用电气公司 | The helical scanning computed tomography that has tracking X-ray source |
| CN1827047A (en) * | 2005-03-03 | 2006-09-06 | 株式会社东芝 | X-ray diagnostic apparatus |
| CN101945614A (en) * | 2008-02-14 | 2011-01-12 | 皇家飞利浦电子股份有限公司 | Multiple-source imaging system with flat-panel detector |
| CN102413767A (en) * | 2009-03-02 | 2012-04-11 | 罗切斯特大学 | Methods and apparatus for differential phase-contrast fan beam ct, cone-beam ct and hybrid cone-beam ct |
-
2012
- 2012-05-07 CN CN201210138231XA patent/CN103385729A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061524A (en) * | 1990-11-19 | 1992-06-03 | 通用电气公司 | The helical scanning computed tomography that has tracking X-ray source |
| CN1827047A (en) * | 2005-03-03 | 2006-09-06 | 株式会社东芝 | X-ray diagnostic apparatus |
| CN101945614A (en) * | 2008-02-14 | 2011-01-12 | 皇家飞利浦电子股份有限公司 | Multiple-source imaging system with flat-panel detector |
| CN102413767A (en) * | 2009-03-02 | 2012-04-11 | 罗切斯特大学 | Methods and apparatus for differential phase-contrast fan beam ct, cone-beam ct and hybrid cone-beam ct |
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Application publication date: 20131113 |