CN104095647A - CT (computed tomography) system scanning positioning method - Google Patents
CT (computed tomography) system scanning positioning method Download PDFInfo
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- CN104095647A CN104095647A CN201310116502.6A CN201310116502A CN104095647A CN 104095647 A CN104095647 A CN 104095647A CN 201310116502 A CN201310116502 A CN 201310116502A CN 104095647 A CN104095647 A CN 104095647A
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Abstract
The invention relates to a CT (computed tomography) system scanning positioning method, which comprises the following steps that CT common scanning is carried out on a subject for obtaining original data; before final image rebuilding, the original data is subjected to preprocessing for generating pre-rebuilding images; a first preset position and a second preset position are respectively arranged on the pre-rebuilding images; the subject is subjected to CT enhanced scanning in a scanning range defined by the first preset position and the second preset position. The technical scheme has the advantages that the problems of positioning inaccuracy, too long waiting time and the like of the existing CT system scanning positioning method are solved, and the diagnoses and treatment waiting time is saved particularly for emergency subjects.
Description
Technical field
The present invention relates to armarium technical field, particularly the Scan orientation method of CT system.
Background technology
The scanning of transverse section is normally carried out in computed tomography (Computed Tomography, hereinafter to be referred as CT scan) to person under inspection, mainly comprise plain scan (unenhanced) and enhanced ct scans.Wherein, plain scan refers to the conventional sweep that person under inspection carries out in the situation that there is no injection of contrast medium.The object of plain scan be for enhanced ct scans after image contrast so that person under inspection is diagnosed.Enhanced ct scans is, when showing person under inspection's the contrast agent of intravenous injection doses, person under inspection is carried out to CT scan.Enhanced ct scans is in the quantity at each position and the feature of the normal internal structure according to each Different Organs and pathological changes thereof that distributes, to present certain density and paramophia according to the contrast agent that injects human body, thereby shows more clearly the character etc. of focus or clear and definite pathological changes.
Before being carried out to enhanced ct scans, person under inspection conventionally needs to set the start-stop position of scanning.In prior art, main two kinds of methods are set this start-stop position.
A kind of method is first person under inspection to be scanned to generate plain film image as plain film, on this plain film image, the posting of a rectangle will be there is, the start-stop position of scanning is determined on two limits up and down by running fix frame, and the viewing area of plain film image is determined on limit, two of left and right.Then, with the start-stop location positioning sweep limits of setting, again person under inspection is carried out to plain scan and enhanced ct scans.In practice, although it is simple to operate to set the start-stop position of scanning on plain film image, often locate inaccuracy, cause person under inspection to accept unnecessary dosage and radiation.
Another kind method is first person under inspection to be carried out to plain scan, and carries out image reconstruction to scanning the initial data of rear acquisition, then according to reconstruction image, sets the start-stop position of enhanced ct scans.But in practice, the time of image reconstruction is long, especially obtaining the large or algorithm for reconstructing that adopts of original data volume compared with under complicated situation, it is just longer that wait completes time of image reconstruction, this is for the person under inspection of emergency treatment, probably because waits for too long and the best opportunity of delay treatment.
Summary of the invention
The problem that the present invention solves is that the Scan orientation method of existing CT system exists inaccurate, the waits for too long in location.
For addressing the above problem, the invention provides a kind of Scan orientation method of CT system, comprising: person under inspection is carried out to CT plain scan to obtain initial data; Before carrying out the final reconstruction of image, described initial data is carried out to pretreatment to generate pre-reconstruction image; On described pre-reconstruction image, the first precalculated position and the second precalculated position are set respectively; With the determined sweep limits in described the first precalculated position and the second precalculated position, person under inspection is carried out to CT enhanced ct scans.
Optionally, on described pre-reconstruction image, the first precalculated position is set respectively and the second precalculated position comprises: using respectively the position of two different width faultage images in described pre-reconstruction image as described the first precalculated position and described the second precalculated position.
Optionally, with the determined sweep limits in described the first precalculated position and the second precalculated position, person under inspection being carried out to CT enhanced ct scans comprises: using and to described the second precalculated position, as scanning direction, person under inspection is carried out to CT enhanced ct scans from described the first precalculated position.
Optionally, with the determined sweep limits in described the first precalculated position and the second precalculated position, person under inspection being carried out to CT enhanced ct scans comprises: using and to described the first precalculated position, as scanning direction, person under inspection is carried out to CT enhanced ct scans from described the second precalculated position.
Optionally, described CT enhanced ct scans comprises arterial phase scanning, venous phase scanning and scanning period of delay.
Optionally, on described pre-reconstruction image, the first precalculated position being set respectively comprises with the second precalculated position: on described pre-reconstruction image respectively for arterial phase scanning, venous phase scanning and different the first precalculated position of scan setting period of delay and the second different precalculated positions.
Optionally, on described pre-reconstruction image, the first precalculated position being set respectively comprises with the second precalculated position: on described pre-reconstruction image for arterial phase scanning, venous phase scanning and identical the first precalculated position of scan setting period of delay and the second identical precalculated position.
Compared with prior art, technical scheme of the present invention has the following advantages:
Utilization is carried out the fast feature of pretreated reconstruction speed to initial data, has reduced the waiting time of setting the start-stop position of CT enhanced ct scans.Though pre-picture quality of rebuilding image, not as good as the picture quality of initial data being carried out after the final reconstruction of image, is enough to accurately locate the start-stop position of CT enhanced ct scans.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the specific embodiment of the Scan orientation method of a kind of CT system of the present invention.
The specific embodiment
For the problem of prior art, inventor, through research, provides a kind of Scan orientation method of CT system, and not only registration, waiting time are short, and simple to operate, thereby reduce person under inspection, accept unnecessary dosage and radiation.
For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
Shown in Fig. 1 is the schematic flow sheet of the specific embodiment of the Scan orientation method of a kind of CT system of the present invention.With reference to figure 1, described Scan orientation method comprises the steps:
Step S1: person under inspection is carried out to CT plain scan to obtain initial data;
Step S2: before carrying out the final reconstruction of image, described initial data is carried out to pretreatment to generate pre-reconstruction image;
Step S3: on described pre-reconstruction image, the first precalculated position and the second precalculated position are set respectively;
Step S4: person under inspection is carried out to CT enhanced ct scans with the determined sweep limits in described the first precalculated position and the second precalculated position.
The Scan orientation method of CT system the technical program being provided below in conjunction with specific embodiment is described in detail.
In the present embodiment, as described in step S1, person under inspection is carried out to CT plain scan to obtain initial data.In practice, doctor puts position so that within the body part of the required inspection of person under inspection is positioned examination scope, then person under inspection is carried out to CT plain scan to person under inspection on the moving bed of CT system, and after having scanned, CT system can be obtained initial data.Common described initial data comprises the dampening information through the X ray after person under inspection's a certain body part that the detector of CT system receives.
Those skilled in the art know, and the Different Organs in person under inspection's body and tissue are different to the degree of absorption of X ray.Conventionally the region that density is larger for example, to the absorbance of X ray higher (stronger to the damping capacity of X ray, pad value is higher), the skeleton in person under inspection's body; The less region of density is to the absorbance of X ray lower (more weak to the damping capacity of X ray, pad value is lower), and for example person under inspection's body includes the more pulmonary of gas, soft tissue etc.
As described in step S2, before carrying out the final reconstruction of image, described initial data is carried out to pretreatment to generate pre-reconstruction image.
Unlike the prior art, for fear of CT system, according to initial data, carry out the final reconstruction of image and need to expend the plenty of time (generally needing a few minutes or tens minutes), in the present embodiment, CT system is before carrying out the final reconstruction of image, by described initial data being carried out to pretreatment to generate pre-reconstruction image.
It should be noted that, it is also a kind of image reconstruction process that described initial data is carried out to pretreated process, but different from the final reconstruction of existing image, the final algorithm for reconstructing of the more existing image of algorithm that described pretreatment adopts is simpler, by reducing, affect the algorithm (such as correcting algorithm, remove artifact algorithm etc.) of reconstruction speed in the final algorithm for reconstructing of existing image, thereby make that described initial data is carried out to pretreatment, to generate the pre-time of rebuilding image shorter (conventionally only need to several seconds).Certainly, reduced correct image, go the processing such as artifact in the algorithm adopting due to described pretreatment, the bed thickness of each layer of faultage image in the pre-reconstruction image that makes to generate is thicker, and picture quality is general.
As described in step S3, on described pre-reconstruction image, the first precalculated position and the second precalculated position are set respectively.In practice, inventor finds, although the picture quality of described pre-reconstruction image is not as carrying out the picture quality after the final reconstruction of image to initial data, be unsuitable for for this pre-image of rebuilding, person under inspection being diagnosed, but the readability of described pre-reconstruction image is enough to meet setting, person under inspection carried out to the needs of the start-stop position of CT enhanced ct scans.
Described pre-reconstruction image comprises multilamellar faultage image, by faultage image, can reflect the organizational information in layer.In the present embodiment, CT system can be usingd respectively the position of two different width faultage images in described pre-reconstruction image as described the first precalculated position and described the second precalculated position.
It should be noted that, the object that the first precalculated position and the second precalculated position are set on described pre-reconstruction image is in order to determine follow-up start-stop position of person under inspection being carried out to CT enhanced ct scans.In practice, described CT enhanced ct scans can be divided into many phase scanning, comprises arterial phase scanning, venous phase scanning and scanning period of delay.
Therefore, in an embodiment of this step, CT system can only be set start-stop position one time for each issue CT enhanced ct scans, on described pre-reconstruction image for arterial phase scanning, venous phase scanning and identical the first precalculated position of scan setting period of delay and the second identical precalculated position.
In another embodiment of this step, CT system also can be set different start-stop positions for asynchronous CT enhanced ct scans respectively, on described pre-reconstruction image respectively for arterial phase scanning, venous phase scanning and different the first precalculated position of scan setting period of delay and the second different precalculated positions.
As described in step S4, with the determined sweep limits in described the first precalculated position and the second precalculated position, person under inspection is carried out to CT enhanced ct scans.
In an embodiment of this step, CT system can be usingd and to described the second precalculated position, as scanning direction, person under inspection carried out to CT enhanced ct scans from described the first precalculated position.That is to say, using described the first precalculated position as the original position of CT enhanced ct scans, and using the final position of described the second precalculated position as CT enhanced ct scans.
In another embodiment of this step, CT system also can be usingd and to described the first precalculated position, as scanning direction, person under inspection carried out to CT enhanced ct scans from described the second precalculated position.That is to say, using described the second precalculated position as the original position of CT enhanced ct scans, and using the final position of described the first precalculated position as CT enhanced ct scans.
In sum, the Scan orientation method of the CT system providing according to the technical program, utilizes initial data is carried out to the fast feature of pretreated reconstruction speed, has reduced the waiting time of setting the start-stop position of CT enhanced ct scans.And, though the picture quality of initial data being carried out to the pre-reconstruction image that pretreatment generates is not as good as the picture quality after initial data being carried out to image is final and rebuilding, but be enough to accurately locate the start-stop position of CT enhanced ct scans, thereby the Scan orientation method that has solved existing CT system exists, location is inaccurate, the problem of waits for too long, especially for the person under inspection of emergency treatment, has saved the waiting time of diagnoses and treatment.
Although the present invention discloses as above, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, so protection scope of the present invention should be as the criterion with claim limited range.
Claims (7)
1. a Scan orientation method for CT system, is characterized in that, comprising:
Person under inspection is carried out to CT plain scan to obtain initial data;
Before carrying out the final reconstruction of image, described initial data is carried out to pretreatment to generate pre-reconstruction image;
On described pre-reconstruction image, the first precalculated position and the second precalculated position are set respectively;
With the determined sweep limits in described the first precalculated position and the second precalculated position, person under inspection is carried out to CT enhanced ct scans.
2. the Scan orientation method of CT system according to claim 1, is characterized in that, on described pre-reconstruction image, the first precalculated position is set respectively and the second precalculated position comprises:
Using the position of two different width faultage images in described pre-reconstruction image respectively as described the first precalculated position and described the second precalculated position.
3. the Scan orientation method of CT system according to claim 1, it is characterized in that, with the determined sweep limits in described the first precalculated position and the second precalculated position, person under inspection is carried out to CT enhanced ct scans and comprise: using and to described the second precalculated position, as scanning direction, person under inspection is carried out to CT enhanced ct scans from described the first precalculated position.
4. the Scan orientation method of CT system according to claim 1, it is characterized in that, with the determined sweep limits in described the first precalculated position and the second precalculated position, person under inspection is carried out to CT enhanced ct scans and comprise: using and to described the first precalculated position, as scanning direction, person under inspection is carried out to CT enhanced ct scans from described the second precalculated position.
5. the Scan orientation method of CT system according to claim 1, is characterized in that, described CT enhanced ct scans comprises arterial phase scanning, venous phase scanning and scanning period of delay.
6. the Scan orientation method of CT system according to claim 5, is characterized in that, on described pre-reconstruction image, the first precalculated position is set respectively and the second precalculated position comprises:
On described pre-reconstruction image respectively for arterial phase scanning, venous phase scanning and different the first precalculated position of scan setting period of delay and the second different precalculated positions.
7. the Scan orientation method of CT system according to claim 5, is characterized in that, on described pre-reconstruction image, the first precalculated position is set respectively and the second precalculated position comprises:
On described pre-reconstruction image for arterial phase scanning, venous phase scanning and identical the first precalculated position of scan setting period of delay and the second identical precalculated position.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108095751A (en) * | 2017-12-18 | 2018-06-01 | 上海联影医疗科技有限公司 | CT perfusion scannings method, system and storage medium |
| CN113749680A (en) * | 2021-08-05 | 2021-12-07 | 中国人民解放军总医院 | Scanning positioning method, device, storage medium and computer equipment |
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| CN101204330A (en) * | 2006-12-18 | 2008-06-25 | Ge医疗系统环球技术有限公司 | X-ray CT equipment |
| CN102342847A (en) * | 2010-07-22 | 2012-02-08 | Ge医疗系统环球技术有限公司 | X-ray ct apparatus |
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| CN1440725A (en) * | 2002-02-27 | 2003-09-10 | 株式会社东芝 | X-ray computer chromatographic camera device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108095751A (en) * | 2017-12-18 | 2018-06-01 | 上海联影医疗科技有限公司 | CT perfusion scannings method, system and storage medium |
| CN108095751B (en) * | 2017-12-18 | 2021-02-19 | 上海联影医疗科技股份有限公司 | CT perfusion scanning method, system and storage medium |
| CN113749680A (en) * | 2021-08-05 | 2021-12-07 | 中国人民解放军总医院 | Scanning positioning method, device, storage medium and computer equipment |
| CN113749680B (en) * | 2021-08-05 | 2023-08-04 | 中国人民解放军总医院 | Scanning positioning method, scanning positioning device, storage medium and computer equipment |
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Application publication date: 20141015 |