CN104287759B - CT scan imaging method - Google Patents
CT scan imaging method Download PDFInfo
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- CN104287759B CN104287759B CN201310298195.8A CN201310298195A CN104287759B CN 104287759 B CN104287759 B CN 104287759B CN 201310298195 A CN201310298195 A CN 201310298195A CN 104287759 B CN104287759 B CN 104287759B
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- 238000002591 computed tomography Methods 0.000 title claims abstract description 30
- 238000003384 imaging method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000008707 rearrangement Effects 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
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Abstract
The present invention provides a kind of CT scan imaging method, including：The scanning of CT lateral projections is carried out to detected person using CT scan equipment and obtains the initial height of bed of CT lateral radiographs and sick bed when CT lateral radiographs scan；The attenuation curve of each bed board position is obtained according to CT lateral radiographs；The center at the position to be scanned in each bed board position is obtained according to the attenuation curve of each bed board position；The preferable height of bed at the position to be scanned in each bed board position is obtained according to the initial height of bed in the center at the position to be scanned of each bed board position and sick bed；The height of bed after being adjusted according to the preferable height of bed in each bed board position position to be scanned；The scanning of CT agreements is carried out to detected person using the height of bed after adjustment and obtains original raw data；Image reconstruction, which is carried out, according to original raw data obtains CT reconstruction images.The CT reconstruction images obtained using the inventive method can avoid image from gibbs artifact occur, improve picture quality.
Description
【Technical field】
The present invention relates to Computed tomography technical field, more particularly to a kind of CT scan imaging method.
【Technical background】
CT scan equipment is used to carry out Tomography to target to be scanned, and it is included with for detected person's disengaging
The rotary frame of test chamber, it is used on rotary frame the bulb, on rotary frame and relative with bulb that produces X ray
The detector array of setting, for carrying detected person and can be along the axial direction of test chamber passes in and out the sick bed of test chamber, group is set
In the computer being electrically connected with rotary frame and with detector array.Detector array is used to receive the X for penetrating detected person
The X-ray signal received is simultaneously converted into electric signal by ray.The signal that computer includes being received according to detector array enters
The image reconstruction unit of row image reconstruction and the image-display units for showing reconstruction image.Bulb, detector array
The pivot of central passage and rotary frame is on same straight line.
At present, in the process for the CT reconstruction images for being scanned acquisition detected person to detected person using CT scan equipment
Comprise the following steps：The scanning of CT lateral projections is carried out to detected person and obtains CT lateral radiographs；CT is selected according to CT lateral radiographs
Scan vision and scan position；CT agreement scannings are carried out to detected person according to the CT scan visual field of selection and scan position
Obtain initial data；Original number is corrected, reset, process of convolution obtains convolved data；Back projection is carried out to convolved data
Processing obtains CT reconstruction images.During the CT scan, the scanning of CT lateral projections is carried out to detected person and is swept with carrying out CT agreements
The height of bed retouched is changeless, can only be moved along the axial direction of test chamber.But in actual applications can there are the following problems：
Because detected person's bodily form, position to be scanned are different carry detected person the height of bed be it is changeless, can exist treat
The pivot of rotary frame is much deviateed at the center of scanned position, receives the detector mould through the X ray at position to be scanned
Block is the edge detector module of poor-performing, rather than the detector of the better performances in detector array central passage
Module, the quality in turn resulting in the image that the data collected according to detector module are rebuild can be poor, influences the state of an illness and examines
The problem of disconnected；In addition, it there is also position to be scanned as scanning detected person belly when position to be scanned is larger and exceed CT
The scan vision of scanning, cause to treat scanned position and carry out the problem of gibbs artifact occur on the CT images of CT scan acquisition.
Therefore, it is necessory to provide a kind of CT scan imaging method, the defects of for overcoming prior art to exist.
【The content of the invention】
, can be in good time according to the position to be scanned of detected person it is an object of the invention to provide a kind of CT scan imaging method
The height of bed carrying detected person of adjustment carries out CT agreement scannings, ensures that position to be scanned is in the CT scan visual field, avoids CT from scheming
As there is gibbs artifact, picture quality is improved.
To reach above-mentioned purpose, the present invention is achieved through the following technical solutions：A kind of CT scan imaging method, it is wrapped
Include：The scanning of CT lateral projections is carried out to detected person using CT scan equipment and obtains CT lateral radiographs and sick bed in CT lateral radiographs
Initial height of bed during scanning；The attenuation curve of each bed board position is obtained according to CT lateral radiographs；According to each bed board position
Attenuation curve obtains the center that detected person is in the position to be scanned of each bed board position；According in each bed board position
The initial height of bed acquisition when CT lateral radiographs scans of center and sick bed at position to be scanned be in each bed board position
Position to be scanned the preferable height of bed；Bed is carried out to sick bed according to the preferable height of bed in the position to be scanned of each bed board position
Height adjustment adjusted after the height of bed；The scanning of CT agreements is carried out to detected person using the height of bed after adjustment and obtains original raw number
According to；Image reconstruction, which is carried out, according to original raw data obtains CT reconstruction images.
Preferably, the preferable height of bed H in the position to be scanned of some bed board positionidealObtained by equation below
：Wherein, H is sick bed when CT lateral projections scan
The initial height of bed, HmidFor in the center at the position to be scanned of the bed board position, Width is the width of CT lateral radiographs,
PixelSpacing is the distance between two pixels on the horizontal direction of CT lateral radiographs.
Preferably, the attenuation curve of some bed board position is that gray value of the bed board position on CT lateral radiographs is bent
Line.
Preferably, the attenuation curve f (h) of some bed board position is obtained as below by formula：
F (h)=I (p, h), wherein, I (p, h) is the pixel value of the pth row h row on lateral projection, and p is CT lateral radiographs
Line index where the upper bed board position, h are the columns on pth row on CT lateral radiographs.
Preferably, the detected person is in the center H at the position to be scanned of some bed board positionmidBy as follows
Formula obtains：Wherein, HtopFor the height corresponding to first pixel more than threshold value T, that is, treat
Highest boundary position of the scanned position in the bed board opening position；HbottomFor height corresponding to last pixel more than threshold value T
Degree, i.e., minimum boundary position of the position to be scanned in the bed board opening position；Threshold value T is 100.
Preferably, the process for according to original raw data rebuild acquisition CT reconstruction images comprises the following steps：It is right
Original raw data are corrected acquisition correction data；Enter rearrangement to correction data and obtain data rearrangement；Data rearrangement is carried out
Process of convolution obtains convolved data；Back projection is carried out to convolved data and obtains CT reconstruction images.
The height of bed that the CT scan imaging method of the present invention adjusts in good time according to the position to be scanned of detected person carries tested
Survey person carries out CT agreement scannings, ensures that position to be scanned is in the CT scan visual field, avoids CT images from gibbs artifact occur, improves
Picture quality.
【Brief description of the drawings】
Fig. 1 is the schematic flow sheet of CT scan imaging method of the present invention.
Fig. 2 is the attenuation curve using some the bed board position obtained in the inventive method according to CT lateral radiographs.
Fig. 3 is the attenuation curve of the bed board position described in Fig. 2 and the bed board position obtained according to the inventive method
On position center to be scanned.
【Embodiment】
The CT scan imaging method of the present invention is described in further detail below in conjunction with the drawings and specific embodiments.According to
Explanation and claims, advantages and features of the invention will become apparent from below.It should be noted that accompanying drawing use simplifies very much
Form and use non-accurately ratio, be only used for conveniently, lucidly aid in illustrating the embodiment of the present invention purpose.
The height of bed that CT scan imaging method provided by the invention adjusts in good time according to the position to be scanned of detected person carries
Detected person carries out CT agreement scannings, ensures that position to be scanned is in the CT scan visual field, avoids CT images from gibbs artifact occur,
Improve picture quality.
Fig. 1 is the schematic flow sheet of CT scan imaging method of the present invention.This method comprises the following steps：
S11, carry out using CT scan equipment that the scanning of CT lateral projections obtains CT lateral radiographs and sick bed exists to detected person
Initial height of bed when CT lateral radiographs scan；
S12, the attenuation curve according to each bed board position of CT lateral radiographs acquisition；
S13, the portion to be scanned that detected person is in each bed board position is obtained according to the attenuation curve of each bed board position
The center of position；
The center at the position to be scanned of S14, basis in each bed board position and sick bed are when CT lateral radiographs scan
The initial height of bed obtain in each bed board position position to be scanned the preferable height of bed；
The preferable height of bed at the position to be scanned of S15, basis in each bed board position carries out height of bed adjustment to sick bed and obtained
The height of bed after adjustment；
S16, the original raw data of CT agreements scanning acquisition are carried out to detected person using the height of bed after adjustment；
S17, acquisition correction data is corrected to original raw data；
S18, enter rearrangement acquisition data rearrangement to correction data；
S19, process of convolution acquisition convolved data is carried out to data rearrangement；
S20, back projection's acquisition CT reconstruction images are carried out to convolved data.
In step S12, the attenuation curve of some bed board position is the gray scale of the bed board position on CT lateral radiographs
It is worth curve.The attenuation curve f (h) of some bed board position is obtained as below by formula：F (h)=I (p, h), wherein, I (p,
H) it is the pixel value of the pth row h row on CT lateral projections, p is that the line index where the bed board position, h are on CT lateral radiographs
Columns on CT lateral radiographs on pth row.Fig. 2 shows the gray value curve of some bed board position in CT lateral radiographs.
With reference to shown in Fig. 3, in step S13, the detected person is in the center at the position to be scanned of some bed board position
Position HmidObtained by equation below：Wherein, HtopFor first pixel institute for exceeding threshold value T
Corresponding height, i.e., highest boundary position of the position to be scanned in the bed board opening position；HbottomExceed threshold value T for last
Pixel corresponding to height, i.e., minimum boundary position of the position to be scanned in the bed board opening position；Threshold value T is 100.It is horizontal in Fig. 3
Stain on axle is in the center at the position to be scanned of the bed board position shown in Fig. 2.
In step S14, the preferable height of bed H in the position to be scanned of some bed board positionidealPass through equation below
Obtain：Wherein, H is that sick bed scans in CT lateral projections
When the initial height of bed, HmidTo be that the bed board is on CT lateral radiographs in the center at the position to be scanned of the bed board position
The pixel index of the center at the position to be scanned of position, Width are that the width of CT lateral radiographs is CT lateral radiographs transverse direction
Pixel count on direction, PixelSpacing are the distance between two pixels on the horizontal direction of CT lateral radiographs.
To sum up, these are only presently preferred embodiments of the present invention, should not limit the scope of the present invention with this, i.e., it is every according to
The simple equivalent changes and modifications that claims of the present invention and present specification are made, it all should still belong to the present invention
In the range of patent covers.
Claims (5)
- A kind of 1. CT scan imaging method, it is characterised in that including：CT lateral projections scanning acquisition CT lateral radiographs are carried out to detected person using CT scan equipment and sick bed is put down in CT sides position Initial height of bed when piece scans；The attenuation curve of each bed board position is obtained according to CT lateral radiographs；The centre bit at the position to be scanned of each bed board position is according to the attenuation curve of each bed board position acquisition detected person Put；According in the center at the position to be scanned of each bed board position and initial bed of the sick bed when CT lateral radiographs scan Height obtains the preferable height of bed at the position to be scanned in each bed board position, the reason in the position to be scanned of each bed board position Think height of bed HidealObtained by equation below： Its In, H is the sick bed initial height of bed, H when CT lateral projections scanmidFor the center at the position to be scanned of bed board position, Width For the width of CT lateral radiographs, PixelSpacing is the distance between two pixels on the horizontal direction of CT lateral radiographs；Bed after the height of bed is adjusted is carried out to sick bed according to the preferable height of bed in the position to be scanned of each bed board position It is high；The scanning of CT agreements is carried out to detected person using the height of bed after adjustment and obtains original raw data；Image reconstruction, which is carried out, according to original raw data obtains CT reconstruction images.
- 2. CT scan imaging method as claimed in claim 1, it is characterised in that the attenuation curve of each bed board position is bed Gray value curve of the Board position on CT lateral radiographs.
- 3. CT scan imaging method as claimed in claim 2, it is characterised in that the attenuation curve f (h) of each bed board position It is obtained as below by formula：F (h)=I (p, h), wherein, I (p, h) is the pixel value of the pth row h row on CT lateral projections, and p is The line index that CT lateral radiographs are gone to bed where Board position, h are the columns on pth row on lateral radiograph.
- 4. CT scan imaging method as claimed in claim 2, it is characterised in that the detected person is in each bed board position The center H at position to be scannedmidObtained by equation below：Wherein, HtopFor first The height corresponding to pixel more than threshold value T, i.e., highest boundary position of the position to be scanned in bed board opening position；HbottomFor most Height corresponding to pixel of the latter more than threshold value T, i.e., minimum boundary position of the position to be scanned in bed board opening position；Threshold value T For 100.
- 5. the CT scan imaging method as any one of Claims 1-4, it is characterised in that described according to original raw number Comprise the following steps according to the process for rebuild acquisition CT reconstruction images：Acquisition correction data is corrected to original raw data；Enter rearrangement to correction data and obtain data rearrangement；Process of convolution is carried out to data rearrangement and obtains convolved data；Back projection is carried out to convolved data and obtains CT reconstruction images.
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| CN201310298195.8A CN104287759B (en) | 2013-07-16 | 2013-07-16 | CT scan imaging method |
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| CN104771184B (en) * | 2014-01-15 | 2018-11-30 | 上海联影医疗科技有限公司 | CT scan imaging method |
| CN104306012A (en) * | 2014-10-27 | 2015-01-28 | 沈阳东软医疗系统有限公司 | Body surface location method and system |
| CN113288191B (en) * | 2021-05-28 | 2024-04-30 | 东软医疗系统股份有限公司 | Scanning bed correction method, device, medium and equipment based on orthotopic film |
| CN113971705A (en) * | 2021-09-13 | 2022-01-25 | 沈阳先进医疗设备技术孵化中心有限公司 | Image reconstruction method, device and equipment |
| CN117017335B (en) * | 2023-08-16 | 2026-01-09 | 明峰医疗系统股份有限公司 | An automatic bed height adjustment system and method based on whole-body scanning |
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| DE3121728A1 (en) * | 1981-06-01 | 1982-12-16 | Siemens AG, 1000 Berlin und 8000 München | PATIENT STORAGE DEVICE WITH A ROTATING STORAGE |
| JP5184784B2 (en) * | 2007-01-09 | 2013-04-17 | 株式会社東芝 | X-ray CT system |
| WO2010101208A1 (en) * | 2009-03-06 | 2010-09-10 | 株式会社 日立メディコ | X-ray ct device and tomography method |
| CN103142230B (en) * | 2013-03-27 | 2015-05-27 | 深圳安科高技术股份有限公司 | Magnetic resonance positioning scanning method and device |
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Effective date of registration: 20190705 Address after: 213000 Liaohe Road 1008, Xinbei District, Changzhou City, Jiangsu Province Patentee after: Lian Ying (Changzhou) Medical Technology Co., Ltd. Address before: 201815 No. 1180 Xingxian Road, Jiading Industrial Zone, Jiading District, Shanghai Patentee before: Shanghai United Imaging Healthcare Co., Ltd. |
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