CN112890844B - Method and device for measuring levelness of medical imaging equipment, medical imaging equipment and die body - Google Patents
Method and device for measuring levelness of medical imaging equipment, medical imaging equipment and die body Download PDFInfo
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Abstract
The invention discloses a method and a device for measuring levelness of medical imaging equipment, the medical imaging equipment and a die body. The method for measuring the levelness of the medical imaging device comprises the following steps: generating a tomographic image of a phantom in a vertical plane, the phantom having a liquid plane and air above the liquid plane therein; for each horizontal position on the tomographic image: respectively calculating the average value of the tomographic images corresponding to the air and the liquid along the vertical direction; calculating a midpoint value of air and the liquid in a vertical direction of the tomographic image; calculating the vertical position corresponding to the midpoint value on the tomographic image; fitting a straight line to a line formed by points formed by the horizontal position and the corresponding vertical position, and calculating the levelness of the straight line. The invention can be used for measuring the levelness of the system and accurately calibrating the levelness of the system. The image excludes the influence of factors such as system assembly, ground, and the like, and directly calibrates the target beam chain.
Description
Technical Field
The present invention relates to medical imaging.
Background
Calibration of large medical imaging devices is a crucial step for accurate imaging, which also provides benefits for clinical evaluation. In routine inspection or one-time calibration by a manufacturer, image calibration is generally performed using a phantom as a test object.
The levelness of the component may be measured with common tools such as a level. But this measurement method is not straightforward and has accuracy limitations.
Disclosure of Invention
In view of the above, the invention provides a method, a device, a medical imaging device and a die body for measuring levelness of the medical imaging device.
According to a first aspect of the present invention, there is provided a method of measuring levelness of a medical imaging apparatus, comprising: generating a tomographic image of a phantom in a vertical plane, the phantom having a liquid plane and air above the liquid plane therein; for each horizontal position on the tomographic image: respectively calculating the average value of the tomographic images corresponding to the air and the liquid along the vertical direction; calculating a midpoint value of air and the liquid in a vertical direction of the tomographic image; calculating the vertical position corresponding to the midpoint value on the tomographic image; fitting a straight line to a line formed by points formed by the horizontal position and the corresponding vertical position, and calculating the levelness of the straight line.
In one embodimentThe mean value of the tomographic image corresponding to air in the vertical direction thereof is calculated according to the following formula: wherein I (x) 0 Y) is a coordinate of (x 0 The image value of the point of y), respectively, the air is at the passing coordinates (x 0 Maximum and minimum values of the perpendicular to the point of y) in the vertical direction; calculating the mean value of the tomographic image corresponding to the liquid along the vertical direction thereof according to the following formula:
wherein the method comprises the steps ofThe liquid was measured in passing coordinates (x 0 The maximum and minimum of the perpendicular to the point of y) in the vertical direction.
In one embodiment, a midpoint value of air and the liquid in a vertical direction of the tomographic image is calculated according to the following formula: m=m water +M air *M water /(M air +M water ).
In one embodiment, the corresponding vertical position of the midpoint value on the tomographic image is calculated according to the following equation:wherein I (x, y)<M<I(x,y+1).
In one embodiment, levelness is calculated according to the following formula:x start 、x end the minimum and maximum values of the straight line in the horizontal direction of the tomographic image are respectively, a line segment p (x) is a straight line fit to y' (x), and p (x) start )、p(x end ) Respectively x on the straight line start 、x end Corresponding values.
According to a second aspect of the present invention, there is provided an apparatus for measuring levelness of a medical imaging device, comprising: a tomographic image generation unit that generates a tomographic image of a phantom in a vertical plane, the phantom having a liquid plane and air above the liquid plane therein; a mean value calculation unit that calculates a mean value of the tomographic images corresponding to the air and the liquid in a vertical direction thereof, respectively, for each horizontal position on the tomographic images; a midpoint value calculating unit that calculates a midpoint value of air and the liquid in a vertical direction of the tomographic image for each horizontal position on the tomographic image; a position calculation unit that calculates, for each horizontal position on the tomographic image, a corresponding vertical position of the midpoint value on the tomographic image; and the levelness calculating unit is used for fitting a straight line to a line formed by points consisting of the horizontal position and the corresponding vertical position, and calculating the levelness of the straight line.
In an embodiment, the mean value calculating unit calculates a mean value of the tomographic image corresponding to air in the vertical direction thereof according to the following formula:wherein I (x) 0 Y) is a coordinate of (x 0 Image value of the point of y),>respectively, the air is at the passing coordinates (x 0 Maximum and minimum values of the perpendicular to the point of y) in the vertical direction; the mean value calculating unit calculates a mean value of the tomographic image corresponding to the liquid in a vertical direction thereof according to the following formula: />Wherein->The liquid was measured in passing coordinates (x 0 The maximum and minimum of the perpendicular to the point of y) in the vertical direction.
In an embodiment, the midpoint calculating unit calculates a midpoint value of air and the liquid in a vertical direction of the tomographic image according to the following formula: m=m water +M air *M water /(M air +M water ).
In an embodiment, the position calculation unit calculates the vertical position of the midpoint value corresponding to the tomographic image according to the following formula:wherein I (x, y)<M<I(x,y+1).
In one embodiment, the levelness calculation unit calculates the levelness according to the following formula:
x start 、x end the minimum and maximum values of the straight line in the horizontal direction of the tomographic image are respectively, a line segment p (x) is a straight line fit to y' (x), and p (x) start )、p(x end ) Respectively x on the straight line start 、x end Corresponding values.
According to a third aspect of the present invention there is provided a medical imaging apparatus comprising a device for measuring levelness of a medical imaging apparatus as described above.
In an embodiment, the medical imaging device is a computed tomography device or a positron tomography device.
According to a fourth aspect of the present invention there is provided a mould body comprising: a cylindrical body made of plastic and having a length in a longitudinal direction greater than the scanning area; the two end covers are fixed at two ends of the cylindrical body and form a cylindrical accommodating space with the cylindrical body, and the cylindrical accommodating space and the cylindrical body share a rotating shaft; and the opening is positioned on the end cover and communicated with the cylindrical accommodating space.
In one embodiment, the mold body further includes a reticle positioned on the end cap and parallel to the rotational axis.
In one embodiment, the opening is closed by a plastic latch and an O-ring.
The die body, the method for measuring the levelness of the medical imaging device, the device for measuring the levelness of the medical imaging device and the medical imaging device can be used for measuring the levelness of a system and accurately calibrating the levelness of the system. The image excludes the influence of factors such as system assembly, ground, and the like, and directly calibrates the target beam chain. The calibrated imaging system can improve the accuracy and quantification of disease detection and reduce dose.
Drawings
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings in which:
FIG. 1 is a schematic view of a mold body according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a medical imaging device according to an embodiment of the invention.
Fig. 3 is a cross-sectional view of a scan plane of a medical imaging device according to an embodiment of the invention.
Fig. 4 is a flow chart of a method of measuring levelness of a medical imaging device according to an embodiment of the present invention.
Fig. 5 is a schematic view of a line composed of points of horizontal positions and corresponding vertical positions of respective midpoint values on a tomographic image according to an embodiment of the present invention.
Fig. 6 is a schematic structural view of an apparatus for measuring levelness of a medical imaging device according to an embodiment of the present invention.
In the above figures, the following reference numerals are used:
100. die body 120 detector
102. Cylindrical body 122 scanning window
104. Opening 200 method
106. Rotating shafts S202, S204, S206, S208, S210
108. End cap 300 device
110. Graticule 302 tomographic image generation unit
112. Rack 304 mean calculation unit
114. Midpoint value calculating unit of examining table 306
116 X-ray tube 308 position calculation unit
118 X-ray 310 levelness calculating unit
Detailed Description
The present invention will be further described in detail with reference to the following examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Fig. 1 is a schematic view of a mold body 100 according to an embodiment of the present invention. The mold body 100 includes a cylindrical body 102, two end caps 108, and an opening 104. The cylindrical body 102 is made of plastic, in this embodiment polymethyl methacrylate. The length of the cylindrical body 102 in the longitudinal direction is greater than the scanning area to eliminate the effect of the end. The two end caps 108 are fixed to both ends of the cylindrical body 102, and form a cylindrical accommodating space with the cylindrical body 102, the cylindrical accommodating space having the same rotation axis 106 as the cylindrical body 102. The end cap 108 may also be made of a plastic such as polymethyl methacrylate. The opening 104 is located in the end cap 108 and communicates with the cylindrical receiving space, and the opening 104 may be closed by a plastic latch and an O-ring. A liquid such as water may be injected into the cylindrical receiving space through the opening 104. The phantom 100 may also include a reticle 110 positioned on the end cap 108 and parallel to the axis of rotation 106. Reticle 110 is used to align with a laser beam of a medical imaging device.
Fig. 2 is a schematic diagram of a medical imaging device according to an embodiment of the invention. In this embodiment, the medical imaging apparatus is a Computed Tomography (CT) apparatus. The CT apparatus includes a gantry 112 and an examination couch 114. The mold body 100 is filled with half of its volume of water, and air is above the water surface. The phantom 100 is placed on an couch 114 of a CT apparatus and the phantom 100 on the couch 114 is movable to a scan-centered position with the aid of laser positioning and a reticle 110 of the phantom 100. After standing for several minutes, the water in the cylindrical receiving space of the mold body 100 forms a horizontal plane.
The phantom 100 may be scanned in a typical phantom and a field of view (FOV) of 500mm is selected to encompass the entire phantom 100. Fig. 3 is a cross-sectional view of a scan plane of a medical imaging device according to an embodiment of the invention. As shown in fig. 3, the gantry 112 includes a scan window 122, an X-ray tube 116, and a detector 120. The X-ray beam 118 emitted by the X-ray tube 116 reaches the phantom 100, the couch 114 and the detector 120 in sequence. The X-ray tube 116 and the detector 120 are located in a rotating portion of the gantry 112 and rotate in the direction of the arrow in the figure. The CT apparatus may scan the phantom 100 and reconstruct a tomographic image.
Fig. 4 is a flow chart of a method 200 of measuring levelness of a medical imaging device according to an embodiment of the present invention. As shown in fig. 4, the method 200 of measuring levelness of a medical imaging apparatus includes step S202, step S204, step S206, step S208, step S210.
In step S202, a tomographic image of the phantom 100 in a vertical plane is generated, the phantom 100 having a horizontal plane and air above the horizontal plane. The tomographic image at point (x, y) can be represented as I (x, y), where x ε [1,512 ]],y∈[1,512]The water and air in the phantom 100 may be partitioned according to HU values using a watershed algorithm. The HU value of the water is in the range of [ -300,50]The HU value of the air ranges from 1050 to 800]Thus, the range of water in the vertical direction of the tomographic image isThe range of air in the vertical direction of the tomographic image is +.>These two ranges are related to the value of x.
In step S204, for each horizontal position on the tomographic image, the mean value of the tomographic image corresponding to air and water in the vertical direction thereof is calculated, respectively. In the present embodiment, the average value of the tomographic image corresponding to air in the vertical direction thereof is calculated according to the following formula:wherein I (x) 0 Y) is a coordinate of (x 0 Image value of the point of y),>respectively, the air is at the passing coordinates (x 0 The maximum and minimum of the perpendicular to the point of y) in the vertical direction. The mean value of the tomographic image corresponding to water in its vertical direction is calculated according to: /> Wherein->The water passing through the coordinates are (x 0 The maximum and minimum of the perpendicular to the point of y) in the vertical direction.
In step S206, for each horizontal position on the tomographic image, a midpoint value of air and water in the vertical direction of the tomographic image is calculated. In the present embodiment, the midpoint value of air and water in the vertical direction of the tomographic image is calculated according to the following formula: m=m water +M air *M water /(M air +M water ).
In step S208, for each horizontal position on the tomographic image, a corresponding vertical position of the midpoint value on the tomographic image is calculated. In the present embodiment, the vertical position of the midpoint value corresponding on the tomographic image is calculated according to the following expression:wherein I (x, y)<M<I (x, y+1). Fig. 5 is a schematic view of a line composed of points (x, y' (x)) of horizontal positions and corresponding vertical positions of the midpoint values on the tomographic image according to an embodiment of the present invention.
In step S210, a line of points (x, y' (x)) consisting of a horizontal position and its corresponding vertical position is fitted with a straight line, and the levelness of the straight line is calculated. In this embodiment, the levelness is calculated according to the following formula:
x start 、x end the minimum and maximum values of the straight line in the horizontal direction of the tomographic image are respectively, the line segment p (x) is a straight line fit to y' (x), and p (x) start )、p(x end ) Respectively x on the straight line start 、x end Corresponding values.
In order to eliminate the disturbance, only the middle part of the line constituted by the points constituted by the horizontal position and its corresponding vertical position is selected.
The phantom and the method of measuring the levelness of the medical imaging device of the present invention can be used to measure the levelness of a system and accurately calibrate it. The image excludes the influence of factors such as system assembly, ground, and the like, and directly calibrates the target beam chain. The calibrated imaging system can improve the accuracy and quantification of disease detection and reduce dose.
Fig. 6 is a schematic structural view of an apparatus 300 for measuring levelness of a medical imaging device according to an embodiment of the present invention. As shown in fig. 6, the apparatus 300 for measuring the levelness of the medical imaging device includes a tomographic image generation unit 302, a mean value calculation unit 304, a midpoint value calculation unit 306, a position calculation unit 308, and a levelness calculation unit 310.
The tomographic image generation unit 302 generates a tomographic image of the phantom 100 in a vertical plane, the phantom 100 having a horizontal plane and air above the horizontal plane. The tomographic image at point (x, y) can representIs I (x, y), where x is E [1,512 ]],y∈[1,512]The water and air in the phantom 100 may be partitioned according to HU values using a watershed algorithm. The HU value of the water is in the range of [ -300,50]The HU value of the air ranges from 1050 to 800]Thus, the range of water in the vertical direction of the tomographic image isThe range of air in the vertical direction of the tomographic image is +.>These two ranges are related to the value of x.
For each horizontal position on the tomographic image, the average value calculation unit 304 calculates the average value of the tomographic image corresponding to air and water in the vertical direction thereof, respectively. In the present embodiment, the average value calculation unit 304 calculates the average value of the tomographic image corresponding to air in the vertical direction thereof according to the following formula:wherein I (x) 0 Y) is a coordinate of (x 0 Image value of the point of y),>respectively, the air is at the passing coordinates (x 0 The maximum and minimum of the perpendicular to the point of y) in the vertical direction. The mean value of the tomographic image corresponding to water in its vertical direction is calculated according to: />Wherein-> The water passing through the coordinates are (x 0 The maximum and minimum of the perpendicular to the point of y) in the vertical direction.
For each horizontal position on the tomographic image, the midpoint value calculation unit 306, a midpoint value of air and water in the vertical direction of the tomographic image is calculated. In the present embodiment, the midpoint value calculating unit 306 calculates the midpoint value of air and water in the vertical direction of the tomographic image according to the following equation: m=m water +M air *M water /(M air +M water ).
For each horizontal position on the tomographic image, the position calculation unit 308 calculates a corresponding vertical position of the midpoint value on the tomographic image. In the present embodiment, the vertical position of the midpoint value corresponding on the tomographic image is calculated according to the following expression:wherein I (x, y)<M<I (x, y+1). Fig. 5 is a schematic view of a line composed of points (x, y' (x)) of horizontal positions and corresponding vertical positions of the midpoint values on the tomographic image according to an embodiment of the present invention.
The levelness calculation unit 310 fits a straight line to a line composed of points of the horizontal position and its corresponding vertical position, and calculates the levelness of the straight line. In the present embodiment, the levelness calculation unit 310 calculates levelness according to the following equation:
x start 、x end the minimum and maximum values of the straight line in the horizontal direction of the tomographic image are respectively, the line segment p (x) is a straight line fit to y' (x), and p (x) start )、p(x end ) Respectively x on the straight line start 、x end Corresponding values.
In order to eliminate the disturbance, only the middle part of the line constituted by the points constituted by the horizontal position and its corresponding vertical position is selected.
According to a further aspect of the present invention, a medical imaging apparatus is provided comprising a device 300 for measuring levelness of the medical imaging apparatus as described above. The medical imaging device may be a computed tomography device or a positron tomography device.
The device for measuring the levelness of the medical imaging equipment and the related medical imaging equipment can be used for measuring the levelness of a system and accurately calibrating the levelness of the system. The image excludes the influence of factors such as system assembly, ground, and the like, and directly calibrates the target beam chain. The calibrated imaging system can improve the accuracy and quantification of disease detection and reduce dose.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (12)
1. A method of measuring levelness of a medical imaging device, comprising:
generating a tomographic image of a phantom in a vertical plane, the phantom having a liquid plane and air above the liquid plane therein;
for each horizontal position on the tomographic image:
respectively calculating the average value of the tomographic images corresponding to the air and the liquid along the vertical direction;
calculating a midpoint value of air and the liquid along a vertical direction of the tomographic image according to the average value;
calculating the vertical position corresponding to the midpoint value on the tomographic image;
fitting a straight line to a line formed by points formed by the horizontal position and the corresponding vertical position of the corresponding midpoint value on the tomographic image, and calculating the levelness of the straight line.
2. The method according to claim 1, wherein the mean value of the tomographic image corresponding to air in the vertical direction thereof is calculated according to the following formula:wherein->Image values of points of ∈, +.>、/>The air passes through->Maximum and minimum values of the perpendicular to the point of (2) in the vertical direction;
calculating the mean value of the tomographic image corresponding to the liquid along the vertical direction thereof according to the following formula:，
wherein the method comprises the steps of、/>The liquid is passing +.>Maximum and minimum values of the perpendicular to the point of (c) in the vertical direction.
3. The method according to claim 2, wherein a midpoint value of air and the liquid in a vertical direction of the tomographic image is calculated according to the following formula:。
4. a method according to claim 3, wherein the corresponding vertical position of the midpoint value on the tomographic image is calculated according to the following formula:=/>wherein->。
5. The method of claim 4, wherein levelness is calculated according to the formula:
，/>、/>the minimum value and the maximum value of the straight line in the horizontal direction of the tomographic image are respectively, a line segment +.>Is to->Straight line fitting of +.>Respectively is +.>、/>Corresponding values.
6. An apparatus for measuring levelness of a medical imaging device, comprising:
a tomographic image generation unit (302) that generates a tomographic image of a phantom in a vertical plane, the phantom having a liquid plane and air above the liquid plane therein;
a mean value calculation unit (304) that calculates, for each horizontal position on the tomographic image, a mean value of the tomographic image corresponding to the air and the liquid in a vertical direction thereof, respectively;
a midpoint value calculation unit (306) that calculates, for each horizontal position on the tomographic image, a midpoint value of air and the liquid in a vertical direction of the tomographic image from the average value;
a position calculation unit (308) that calculates, for each horizontal position on the tomographic image, a corresponding vertical position of the midpoint value on the tomographic image;
and a levelness calculation unit (310) that fits a line formed by points, which are formed by the horizontal position and the corresponding vertical position of the corresponding midpoint value on the tomographic image, in a straight line, and calculates the levelness of the straight line.
7. The apparatus according to claim 6, wherein the average value calculating unit (304) calculates the average value of the tomographic image corresponding to air in the vertical direction thereof according to the following formula:wherein->Image values of points of ∈, +.>、/>The air passes through->Maximum and minimum values of the perpendicular to the point of (2) in the vertical direction;
the mean value calculating unit calculates a mean value of the tomographic image corresponding to the liquid in a vertical direction thereof according to the following formula:，
wherein the method comprises the steps of、/>The liquid is passing +.>Maximum and minimum values of the perpendicular to the point of (c) in the vertical direction.
8. The apparatus according to claim 7, wherein the midpoint value calculating unit (306) calculates a midpoint value of the air and the liquid in a vertical direction of the tomographic image according to the following formula:。
9. the apparatus according to claim 8, wherein the position calculation unit (308) calculates the corresponding vertical position of the midpoint value on the tomographic image according to:=/>wherein->。
10. The apparatus according to claim 9, wherein the levelness calculation unit (310) calculates the levelness according to:
，/>、/>the minimum value and the maximum value of the straight line in the horizontal direction of the tomographic image are respectively, a line segment +.>Is to->Straight line fitting of +.>Respectively is +.>、/>Corresponding values.
11. A medical imaging device comprising the apparatus for measuring levelness of a medical imaging device according to any one of claims 6 to 10.
12. The medical imaging device of claim 11, wherein the medical imaging device is a computed tomography device or a positron tomography device.
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| EP1923000A2 (en) * | 2006-11-15 | 2008-05-21 | Centre Hospitalier Regional Universitaire de Lille | Phantom for quality control in tomographic imaging, in particular in PET imaging |
| JP2008119020A (en) * | 2006-11-08 | 2008-05-29 | Rigaku Corp | Detected value calibration method, x-ray ct system, phantom for calibration and holder |
| CN103860182A (en) * | 2012-12-17 | 2014-06-18 | 上海西门子医疗器械有限公司 | Method and system for determining position difference of examination couch and medical treatment appliance |
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| KR100517889B1 (en) * | 2003-05-09 | 2005-09-30 | 주라형 | Phantom for accuracy evaluation of image registration |
| JP4146438B2 (en) * | 2005-01-19 | 2008-09-10 | ザイオソフト株式会社 | Identification method |
| DE602007010192D1 (en) * | 2006-01-26 | 2010-12-16 | Toshiba Kk | X-ray CT device, as well as methods for phantom assignment |
| US8611627B2 (en) * | 2009-12-23 | 2013-12-17 | General Electric Company | CT spectral calibration |
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| JP2008119020A (en) * | 2006-11-08 | 2008-05-29 | Rigaku Corp | Detected value calibration method, x-ray ct system, phantom for calibration and holder |
| EP1923000A2 (en) * | 2006-11-15 | 2008-05-21 | Centre Hospitalier Regional Universitaire de Lille | Phantom for quality control in tomographic imaging, in particular in PET imaging |
| CN103860182A (en) * | 2012-12-17 | 2014-06-18 | 上海西门子医疗器械有限公司 | Method and system for determining position difference of examination couch and medical treatment appliance |
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