CN111096761A - Method, device and related equipment for correcting wedge filter scattering - Google Patents
Method, device and related equipment for correcting wedge filter scattering Download PDFInfo
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- CN111096761A CN111096761A CN201811266237.9A CN201811266237A CN111096761A CN 111096761 A CN111096761 A CN 111096761A CN 201811266237 A CN201811266237 A CN 201811266237A CN 111096761 A CN111096761 A CN 111096761A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000006185 dispersion Substances 0.000 claims abstract description 28
- 238000002591 computed tomography Methods 0.000 claims abstract description 8
- 238000004364 calculation method Methods 0.000 claims description 29
- 230000004044 response Effects 0.000 claims description 20
- 238000010521 absorption reaction Methods 0.000 claims description 14
- 238000003384 imaging method Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 8
- 239000011159 matrix material Substances 0.000 claims description 6
- 238000012986 modification Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
- A61B6/5205—Devices using data or image processing specially adapted for radiation diagnosis involving processing of raw data to produce diagnostic data
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
- A61B6/5211—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data
Abstract
The invention discloses a method and a device for correcting wedge filter scattering and related computed tomography equipment. The method for correcting the scattering of the wedge-shaped filter comprises the following steps: calculating the dispersion delta of a wedge filter0Output delta received in air scanning situationAirScan(ii) a Calculating the dispersion delta of the wedge filter0Output delta received while scanning an objectObjectScan(ii) a According to deltaAirScanAnd deltaObjectScanThe original data r of the object is corrected. The method, the device and the related computer tomography equipment for correcting the wedge filter scattering of the invention remarkably improve the image quality at the edge of a scanned object or a patient, and can be conveniently implemented in the processes of system calibration, data preprocessing and image reconstruction. In dual-energy scanning, the effect of the invention is particularly obvious.
Description
Technical Field
The present invention relates to X-ray medical imaging.
Background
Almost all CT systems use a wedge filter to optimize the dose distribution on the patient, however the wedge filter produces scatter. For multi-slice CT systems with wider collimation apertures, scatter from the wedge filter can have a significant impact on image quality because scatter behaves differently at system commissioning than at clinical scans. Wedge filter scattering typically produces bright or dark regions on the surface of the patient or object being scanned.
In principle, the wedge filter scatter can be predicted by theoretical models and corrected for in preprocessing or image reconstruction. In practice, however, it is not practical to simply remove the scatter signal from the raw data since the wedge filter scatter is already present at the time of system calibration.
The anti-scatter grid may reduce the effect of scattering by the wedge filter, but may increase manufacturing costs.
German patent 102015211607.7 discloses a method for correcting the scatter caused by scanning an object, but does not relate to the scatter of a wedge filter.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for correcting wedge filter scattering, and a related computed tomography apparatus.
According to a first aspect of the present invention there is provided a method of modifying wedge filter dispersion, comprising: calculating the dispersion delta of a wedge filter0Output delta received in air scanning situationAirScan(ii) a Calculating the dispersion delta of the wedge filter0Output delta received while scanning an objectObjectScan(ii) a According to deltaAirScanAnd deltaObjectScanThe original data r of the object is corrected.
In one embodiment, the dependence is δAirScanAnd deltaObjectScanModifying the raw data r of the object is modifying the raw data r of the object according to: r + deltaObjectScan-δAirScan.
In one embodiment, the calculating the dispersion δ of the wedge filter0Output delta in case of air sweepAirScanThe method comprises the following steps: calculating the dispersion delta of the wedge filter0(ii) a Measuring impulse response H (n) of an imaging system2) Wherein n is2Is the impulse response width in units of detector cells; calculating δ according to the formulaAirScan：δAirScan＝H(n2)*δ0Where "+" is the convolution operator.
In one embodiment, the calculating the scattering δ of the wedge filter0Output delta in scanning an objectObjectScanThe method comprises the following steps: calculating the dispersion delta of the wedge filter0(ii) a MeasuringImpulse response of imaging system H (n)2) Wherein n is2Is the impulse response width in units of detector cells; determining an absorption curve C of the object to the X-ray; calculating δ according to the formulaObjectScan：δObjectScan＝H(n2)*{δ0·C}。
In an embodiment, the absorption curve C is exp (-a), where exp () is an exponential function and a is the attenuation coefficient of the object represented in matrix form.
According to a second aspect of the present invention there is provided an apparatus for modifying the dispersion of a wedge filter comprising: a first calculating unit for calculating the scattering delta of the wedge filter0Output delta received in air scanning situationAirScan(ii) a A second calculation unit for calculating the scattering delta of the wedge filter0Output delta received while scanning an objectObjectScan(ii) a A correction unit according to deltaAirScanAnd deltaObjectScanThe original data r of the object is corrected.
In an embodiment, the correction unit corrects the original data r of the object according to: r + deltaObjectScan-δAirScan.
In one embodiment, the first calculation unit includes: a third calculation unit for calculating the scattering delta of the wedge filter0(ii) a A measurement unit for measuring the impulse response H (n) of the imaging system2) Wherein n is2Is the impulse response width in units of detector cells; a fourth calculating unit that calculates δ according to the following equationAirScan：δAirScan＝H(n2)*δ0Where "+" is the convolution operator.
In one embodiment, the second calculation unit includes: a third calculation unit (208) which calculates the scattering delta of the wedge filter0(ii) a A measurement unit for measuring the impulse response H (n) of the imaging system2) Wherein n is2Is the impulse response width in units of detector cells; a determination unit that determines an absorption curve C of an object for X-rays; a fifth calculating unit calculating δ according to the following formulaObjectScan：δObjectScan＝H(n2)*{δ0·C}。
In an embodiment, the absorption curve C is exp (-a), where exp () is an exponential function and a is the attenuation coefficient of the object represented in matrix form.
According to a third aspect of the invention, a computer tomography apparatus is provided, comprising the device as described above.
The method, the device and the related computer tomography equipment for correcting the wedge filter scattering of the invention remarkably improve the image quality at the edge of a scanned object or a patient, and can be conveniently implemented in the processes of system calibration, data preprocessing and image reconstruction. In dual-energy scanning, the effect of the invention is particularly obvious.
Drawings
The foregoing and other features and advantages of the invention will become more apparent to those skilled in the art to which the invention relates upon consideration of the following detailed description of a preferred embodiment of the invention with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of a method of correcting wedge filter dispersion according to a first embodiment of the present invention.
Fig. 2 is a block diagram of an apparatus for correcting wedge filter dispersion according to a second embodiment of the present invention.
FIGS. 3A and 4A are tomograms without wedge filter scatter correction.
Figures 3B and 4B are tomograms with wedge filter scatter correction according to the first and second embodiments of the present invention.
In the above figures, the reference numerals used are as follows:
method for correcting wedge filter scattering 208 third calculation unit
S102、S104、
S106、S108、
S110、S112、
S114、S116
200 device for correcting wedge filter scattering 212 fourth calculation unit
202 first calculation unit 214 determination unit
204 second calculation unit 216 fifth calculation unit
206 correction unit
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by referring to the following examples.
FIG. 1 is a flow chart of a method 100 of correcting wedge filter dispersion according to a first embodiment of the present invention. As shown in fig. 1, the method 100 of correcting wedge filter dispersion includes steps S102, S104, and S106.
In step S102, the dispersion delta of the wedge filter is calculated0Output delta received in air scanning situationAirScan。
In step S104, the dispersion delta of the wedge filter is calculated0Output delta received while scanning an objectObjectScan。
In step S106, according to δAirScanAnd deltaObjectScanThe original data r of the object is corrected. In the present embodiment, the original data r of the object is corrected according to the following equation:
r＝r+δobjectScan-δAirScan.
the raw data after correction can be subjected to general preprocessing.
In the present embodiment, step S102 includes step S108, step S110, and step S112.
In step S108, the dispersion delta of the wedge filter is calculated0。δ0Can be calculated or simulated according to the corresponding physical model of the wedge filter.
In step S110, the impulse response H (n) of the imaging system is measured2) Wherein n is2Is the impulse response width in units of detector cells.
In step S112, δ is calculated according to the following equationAirScan：
δAirScan＝H(n2)*δ0Where "+" is the convolution operator.
In the present embodiment, step S104 includes step S108, step S110, step S114, and step S116.
In step S114, an absorption curve C of the object for X-rays is determined. In the present embodiment, the absorption curve C is exp (-a), where exp () is an exponential function and a is an attenuation coefficient of the object represented in a matrix form. The absorption curve C may be determined from raw data obtained after the object is scanned.
In step S116, δ is calculated according to the following equationObjectScan：
δObjectScan＝H(n2)*{δ0·C}。
Fig. 2 is a block diagram of an apparatus 200 for correcting wedge filter dispersion according to a second embodiment of the present invention. As shown in fig. 2, the apparatus 200 for correcting wedge filter scattering comprises a first calculation unit 202, a second calculation unit 204 and a correction unit 206. The first calculation unit 202 calculates the dispersion delta of the wedge filter0Output delta in case of air sweepAirScan. The second calculation unit 204 calculates the dispersion delta of the wedge filter0Output delta in scanning an objectObjectScan. The correction unit 206 is based on deltaAirScanAnd deltaObjectScanThe original data r of the object is corrected. In the present embodiment, the original data r of the object is corrected according to the following equation:
r＝r+δobjectScan-δAirScan.
the raw data after correction can be subjected to general preprocessing.
In the present embodiment, the first calculation unit 202 includes a third calculation unit 208, a measurement unit 210, and a fourth calculation unit 212. The third calculation unit 208 calculates the dispersion delta of the wedge filter0And the calculation or simulation can be carried out according to the corresponding physical model of the wedge filter. The measurement unit 210 measures the impulse response H (n) of the imaging system2) Wherein n is2Is the impulse response width in units of detector cells. The fourth calculating unit 212 is calculated according to the following equationCalculating deltaAirScan：
δAirScan＝H(n2)*δ0Where "+" is the convolution operator.
In the present embodiment, the second calculation unit 204 includes a third calculation unit 208, a measurement unit 210, a determination unit 214, and a fifth calculation unit 216. The determination unit 214 determines an absorption curve C of the object for X-rays. In the present embodiment, the absorption curve C is exp (-a), where exp () is an exponential function and a is an attenuation coefficient of the object represented in a matrix form. The absorption curve C may be determined from raw data obtained after the object is scanned. The fifth calculation unit 216 calculates δ according to the following equationObjectScan：
δObjectScan＝H(n2)*{δ0·C}。
The apparatus 200 for correcting wedge filter scatter may be implemented as part of a computed tomography device.
Fig. 3A and 4A are tomograms without wedge filter scatter correction, and fig. 3B and 4B are tomograms with wedge filter scatter correction according to the first and second embodiments of the present invention. As can be seen from the figure, the scattering correction of the wedge-shaped filter can reduce the light and shade area formed on the surface of the object by the scattering of the wedge-shaped filter.
The method, the device and the related computer tomography equipment for correcting the wedge filter scattering of the invention remarkably improve the image quality at the edge of a scanned object or a patient, and can be conveniently implemented in the processes of system calibration, data preprocessing and image reconstruction. In dual-energy scanning, the effect of the invention is particularly obvious.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (11)
1. A method (100) of modifying wedge filter dispersion, comprising:
calculating the dispersion delta of a wedge filter0In the skyOutput delta received under gas scanningAirScan；
Calculating the dispersion delta of the wedge filter0Output delta received while scanning an objectObjectScan；
According to deltaAirScanAnd deltaObjectScanThe original data r of the object is corrected.
2. The method of claim 1, wherein said function δAirScanAnd deltaObjectScanModifying the raw data r of the object is modifying the raw data r of the object according to:
r＝r+δObjectScan-δAirScan。
3. the method of claim 1, wherein the calculating the dispersion δ of the wedge filter0Output delta in case of air sweepAirScanThe method comprises the following steps:
calculating the dispersion delta of the wedge filter0；
Measuring impulse response H (n) of an imaging system2) Wherein n is2Is the impulse response width in units of detector cells;
calculating δ according to the formulaAirScan：
δAirScan＝H(n2)*δ0Where "+" is the convolution operator.
4. The method of claim 1, wherein said calculating a dispersion δ of said wedge filter0Output delta in scanning an objectObjectScanThe method comprises the following steps:
calculating the dispersion delta of the wedge filter0；
Measuring impulse response H (n) of an imaging system2) Wherein n is2Is the impulse response width in units of detector cells;
determining an absorption curve C of the object to the X-ray;
calculating δ according to the formulaObjectScan：
δObjectScan＝H(n2)*{δ0·C}。
5. Method according to claim 4, characterized in that the absorption curve C is exp (-A), where exp () is an exponential function and A is the attenuation coefficient of the object represented in matrix form.
6. An apparatus (200) for modifying wedge filter dispersion, comprising:
a first calculation unit (202) which calculates the scattering delta of the wedge filter0Output delta received in air scanning situationAirScan；
A second calculation unit (204) which calculates the scattering delta of the wedge filter0Output delta received while scanning an objectObjectScan；
A correction unit (206) based on deltaAirScanAnd deltaObjectScanThe original data r of the object is corrected.
7. The apparatus (200) of claim 6, wherein said modification unit (206) modifies said object's raw data r according to:
r＝r+δObjectScan-δAirScan。
8. the apparatus (200) of claim 6, wherein said first computing unit (202) comprises:
a third calculation unit (208) which calculates the scattering delta of the wedge filter0；
A measurement unit (210) that measures an impulse response H (n) of the imaging system2) Wherein n is2Is the impulse response width in units of detector cells;
a fourth calculation unit (212) which calculates δ according to the following formulaAirScan：
δAirScan＝H(n2)*δ0Where "+" is the convolution operator.
9. The apparatus (200) of claim 6, wherein said second computing unit (204) comprises:
a third calculation unit (208) which calculates the scattering delta of the wedge filter0；
A measurement unit (210) that measures an impulse response H (n) of the imaging system2) Wherein n is2Is the impulse response width in units of detector cells;
a determination unit (214) which determines an absorption curve C of the object for the X-rays;
a fifth calculation unit (216) that calculates δ according to the following equationObjectScan：
δObjectScan＝H(n2)*{δ0·C}。
10. The apparatus (200) according to claim 9, wherein the absorption curve C ═ exp (-a), where exp () is an exponential function and a is the attenuation coefficient of the object represented in matrix form.
11. A computer tomography apparatus comprising the apparatus of any one of claims 6 to 10.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023051107A1 (en) * | 2021-09-30 | 2023-04-06 | Siemens Shanghai Medical Equipment Ltd. | Correction method for scatter signal caused by wedge filter and storage medium |
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