CN209933861U - Multifunctional image guide verification die body - Google Patents
Multifunctional image guide verification die body Download PDFInfo
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- CN209933861U CN209933861U CN201920326240.9U CN201920326240U CN209933861U CN 209933861 U CN209933861 U CN 209933861U CN 201920326240 U CN201920326240 U CN 201920326240U CN 209933861 U CN209933861 U CN 209933861U
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Abstract
The utility model discloses a multi-functional image guide verifies die body is a multi-functional image guide of dose and non-dose verifies die body in being arranged in radiotherapy. The phantom can be widely applied to the accuracy verification of two-dimensional and three-dimensional image registration, the consistency verification of a light field and an irradiation field, the verification of the displacement of a treatment bed and the quality control of an image system and an accelerator. The die body comprises a polyamide cube, and 5 spherical air cavities are formed in the die body. The left surface of the die body is embedded with a circular ring, and each sphere air cavity is provided with a corresponding circular ring corresponding to the sphere air cavity. The phantom is made of materials which are easily purchased in the market, and the accuracy and the consistency of image registration or the verification of the displacement of a treatment bed can be realized according to the appearance of a designed spherical air cavity and a designed spherical ring in kilovolt (kV) and/or Megavolt (MV) projection images and Cone Beam Computed Tomography (CBCT) images of the phantom kV and/or MV. The use of a spherical air cavity ensures sufficient image contrast.
Description
Technical Field
The utility model relates to a multifunctional image verification die body supporting dose and non-dose function detection in a radiotherapy planning system (TPS), a radiotherapy system irradiation and electronic Computed Tomography (CT) simulation positioning machine.
Background
The quality control of radiotherapy equipment is an extremely important link in clinical tumor radiotherapy, and plays a key role in accurate delivery of radiotherapy dose and radiotherapy curative effect of patients. Especially, with the continuous development of radiotherapy technology, advanced radiotherapy equipment and radiotherapy technology are emerging. Clinically, a series of tests and calibrations, including daily, weekly, monthly and annual tests, are performed on the radiotherapy equipment periodically to ensure that the radiotherapy equipment is properly performed, thereby avoiding medical accidents. In these daily tests, different phantoms and instruments are required to perform the relevant tests on the mechanical accuracy of the radiotherapy apparatus, the dose delivery system, the image guidance system, and the like. The current test items are various, the die body needs to be replaced continuously, the function of the die body is single, and although the die body has import die bodies with related functions, the price is high, the functions are limited, and the current clinical requirements can not be met easily.
Disclosure of Invention
In view of the above, the present invention is directed to a multi-functional image-guided verification phantom supporting multiple dose and non-dose function tests in a radiation therapy planning system and a CT simulation positioner. The phantom can be used for routine testing, acceptance, upgrade and maintenance testing of new systems, and can ensure the normal operation of radiotherapy planning system software, a radiotherapy system and a CT simulator.
The technical scheme of the utility model is that:
a multifunctional image guide verification die body is a low-density polyamide cube, and isocentric cross lines and off-axis cross lines are arranged on the upper surface of the die body, the left surface of the die body, the right surface of the die body, the outer surface of the die body and the inner surface of the die body and respectively indicate the positions of a treatment bed after initial and automatic positioning is finished; the center point of the off-axis cross line on the die body is positioned in an area defined by the right surface facing the die body and the inside of the die body, the center point of the off-axis cross line on the left surface of the die body is positioned in an area defined by the right surface facing the die body and the inside of the die body, the center point of the off-axis cross line on the right surface of the die body is positioned in an area defined by the upper surface facing the die body and the right surface facing the die body, the center point of the off-axis cross line on the outside of the die body is positioned in an area defined by the upper surface facing the die body and the right surface facing the die body, and the center point; the coordinate position of the off-axis cross line on each surface is symmetrical to the coordinate position of the off-axis cross line on the opposite surface of the die body; a shaft circular center ring is arranged at the cross center point of the isocentric cross line on each surface; the inside of the die body is fixed with a sphere air cavity, and the left surface of the die body is embedded with 5 circular rings which correspond to the 5 sphere air cavities respectively.
The volume of the low density polyamide cubes was 16cm x 16 cm.
5 sphere air cavities are arranged in the die body, the diameter of the sphere air cavity at the center is 1.6cm, and the diameters of the other sphere air cavities are 1.2 cm; the sphere air cavity is fixed, the central sphere is positioned in the center of the die body, two spheres are positioned at outer positions relative to the isocenter, and two spheres are positioned at inner positions relative to the isocenter.
The shaft center ring is two concentric circles with diameters of 4mm and 8 mm.
Light field indicating lines are arranged in front of and on the right side of the die body, and the light field indicating lines are three calibration square marks which take the central point of the isocenter cross line as the center and have the sizes of 4cm multiplied by 4cm, 10cm multiplied by 10cm and 12cm multiplied by 12 cm.
The upper surface of the die body is also provided with a direction mark and a horizontal indicator; the direction marks are four characters of SUP, INF, L and R, the characters are respectively positioned at the end points of the isocenter cross line, the SUP characters are arranged on one side of the inner side of the explorator body, the INF characters are arranged on one side of the outer side of the explorator body, the L characters are arranged on one side of the left side of the explorator body, the R characters are arranged on one side of the right side of the explorator body, namely, the L and the R respectively represent the left and the right of a patient, the SUP represents the inner side, and the INF represents; the horizontal indicator is a circular indicator with a bubble at the center and is embedded in the upper surface of the die body.
Four end points of a cross line of the isocentric cross line are close to the edge part of the die body, and scribed lines accurate to 5mm grids are arranged on the isocentric cross line.
The utility model has the advantages that:
the multifunctional image guide verification model body is made of materials which are easily available in the market according to the principle of tissue equivalent radiation physics. The phantom supports multiple dose and non-dose functional tests, can be used for routine testing, and acceptance, upgrade and maintenance testing of new systems, and can ensure the normal operation of radiotherapy planning system software, radiotherapy systems and CT simulators. In addition, can conveniently adjust the level with the die body swiftly easily, can conveniently remove and put this die body.
Drawings
FIG. 1 is a schematic view of the shape of the mold body of the present invention;
FIG. 2 is a schematic view of the shape of the mold body of FIG. 1 viewed from the opposite direction;
FIG. 3 is a schematic view of the top of the mold body;
FIG. 4 is a schematic view of the left side of the phantom.
1-on the die body, 2-on the die body, 3-on the die body, 4-on the die body, 5-on the die body, 6-direction identification, 7-off-axis cross line, 8-axis circular center ring, 9-equal center cross line, 10-light field, 11-horizontal indicator, 12-circular ring.
Detailed Description
The invention is further described below with reference to the accompanying drawings. For accurate depiction and understanding of the structure of the mold body, the mold body surfaces facing the left and right directions of the patient are respectively positioned as a mold body left surface 4 and a mold body right surface 2, and the mold body surfaces facing the direction of the frame and departing from the direction of the frame are respectively positioned as a mold body inner surface 5 and a mold body outer surface 3.
As shown in fig. 1 and fig. 2, the multifunctional image-guided verification phantom of the present invention is a low-density polyamide cube of 16cm × 16cm × 16 cm. Five surfaces of the upper surface 1 of the die body, the left surface 4 of the die body, the right surface 2 of the die body, the outer surface 3 of the die body and the inner surface 5 of the die body are respectively provided with an isocentric cross line 9 and an off-axis cross line 7 which respectively indicate the positions of the treatment bed after the initial and automatic positioning is finished. Four end points of the cross line of the isocentric cross line 9 are close to the edge part of the die body, and the isocentric cross line 9 is provided with a scribed line accurate to 5mm grids. A shaft circular center ring 8 is arranged at the cross center point of the isocentric cross line 9 on each surface; the axial center ring 8 is two concentric circles of diameters 4mm and 8 mm. These are all for the purpose of aligning the mold body by means of an accelerator laser.
Referring to fig. 1 and 3, the upper body 1 of the die body is also provided with a direction mark 6, a light field indicating line 10 and a level indicator 11. The direction marks 6 are four characters of SUP, INF, L and R, which are respectively positioned at the end points of the isocenter cross line 9, the SUP characters are positioned on one side of the inside 5 of the explorator body, the INF characters are positioned on one side of the outside 3 of the explorator body, the L characters are positioned on one side of the left side 4 of the explorator body, and the R characters are positioned on one side of the right side 2 of the explorator body, namely, the L and the R respectively represent the left and the right of a patient, the SUP represents the inside (towards the direction of the stander), and the INF represents the outside (deviating from the direction of the stander), so that the. The center point of the off-axis cross 7 is located in the region defined by the right side 2 of the phantom and the inside 5 of the phantom (in the square region identified by the SUP and R characters), the coordinates of the off-axis cross 7 projected on the surface are (-1.0, 1.4, 0) cm, the deviation of the center point location within the phantom from the center of the phantom is known, this location is (-1.0, 1.4, 1.2) cm, and the off-axis cross 7 is not scaled where the source-to-axis distance (SAD) is 100 cm. The orientation of the coordinates is: facing the positioning direction of the die body, i.e. looking from the INF direction of the die body to the SUP direction, XYZ are R (-) L (+), S (+) I (-) and A (+) P (-) of the die body, respectively. The light field indicating line 10 is three calibration square marks with the central point of the isocenter cross line 9 as the center, and the sizes of the calibration square marks are 4cm multiplied by 4cm, 10cm multiplied by 10cm and 12cm multiplied by 12cm respectively. Because the surface of the phantom is not an isocentric layer, the projection of these squares into the phantom can be scaled by 100cm SAD. For example, the phantom is a 16cm cube, so the 10cm by 10cm light field scales 92/100. (the scaling is relative to the accelerator light field, e.g., a 10cm x 10cm square field inside the phantom at a standard SAD of 100cm, should be scaled to a 9.2cm x 9.2cm square field at the phantom surface). The horizontal indicator 11 is a circular indicator with a bubble at the center and is embedded in the upper surface of the die body. After the die body is placed on an accelerator bed plate, if bubbles appear on the level indicator 11 and are not in the center position, the die body does not swing horizontally, adjustment is needed, and the die body can be conveniently and quickly adjusted to be in a horizontal state.
Referring to fig. 1, a light field indicating line 10 is also arranged on the right side 2 of the die body, and the layout, shape and size of the light field indicating line 10 are the same as those of the light field indicating line 10 on the upper side 1 of the die body. The centre point of the off-axis cross 7 on the right side 2 of the phantom is located in the region defined towards the upper face 1 and the inner face 5 of the phantom and has coordinates of (0, 1.4, 1.2) cm.
Referring to FIG. 1, the center point of the off-axis cross 7 on the outside 3 of the phantom is located in the area defined towards the top 1 of the phantom and the right 2 of the phantom, and has coordinates of (-1, 0, 1.2) cm.
Referring to fig. 2 and 4, the centre point of the off-axis cross 7 on the left side 4 of the phantom is located towards the region defined by the upper phantom face 1 and the inner phantom face 5. The coordinate position of the off-axis cross 7 on the left side 4 of the die body is symmetrical to the coordinate position of the off-axis cross 7 on the right side 2 of the die body opposite to the die body.
Referring to fig. 2, the centre point of the off-axis cross 7 on the inside 5 of the phantom is also located towards the region defined by the top 1 of the phantom and the right 2 of the phantom. The coordinate position of the off-axis cross 7 on the inside 5 of the mold body is symmetrical to the coordinate position of the off-axis cross 7 on the outside 3 of the mold body opposite to the mold body.
Referring to fig. 2 and 4, 5 sphere air cavities are arranged in the mold body, the diameter of the central sphere air cavity is 1.6cm, and the diameters of the other sphere air cavities are 1.2 cm. The left surface 4 of the phantom is embedded with 5 circular rings 12 which correspond to 5 sphere air cavities respectively, and the designed sphere air cavities and the designed circular rings 12 can appear on the projection images of the phantom kV and MV and the CBCT images of the phantom kV and MV. The sphere air cavities are fixed, the central sphere air cavity is positioned in the center of the die body, two sphere air cavities are positioned at the outer positions relative to the isocenter, namely coordinates (-1.0, 3.0 and 2.0) and (-2.0, 6.0 and 4.0), and two sphere air cavities are positioned at the inner positions relative to the isocenter, namely coordinates (0.0, -3.0 and 2.0) and (0.0, -6.0 and 0.0), and all units are cm.
The present invention will be further described with reference to the application of CT images and digitally reconstructed images (DRRs) of phantoms.
The phantom is positioned at the isocenter of the CT scan and CT images of the phantom are acquired. The CT images are passed to the TPS. The planned center is placed at the phantom center (center of the central sphere air cavity) in the TPS, and plots of DRRs are created for the phantom a-P and R-L directions, with field sizes at least as large as the phantom size. DRRs are output to the portal imaging system while being saved for daily Quality Assurance (QA). The CT images are output to the CBCT imaging system while QA is saved for daily use.
Positioning of the die body: and (3) placing the die body on a linear accelerator bed, and aligning the laser lamp mark on the die body with the laser lamp in the machine room, so that the die body is aligned with the isocenter. The level indicator is checked to ensure that the phantom is level. If leveling is desired-for example, if the mold body is placed on an uneven bed surface, the mold body can be adjusted to level the mold body. To get an accurate indication, it is important to look directly at the level indicator from above. The positioning of the phantom must be performed accurately. Rotational or translational deviations of the phantom can lead to inaccurate results.
And (3) light field calibration test: the light field opening field is set to correspond to a light field calibration mark (4cm × 4cm, 10cm × 10cm or 12cm × 12 cm-at the isocentric level) located in front of and to the right of the phantom. The field alignment marker has been scaled from a SAD of 100 cm.
Examination of A-P or R-L projection images: acquiring a kV or MV projection image in the A-P or R-L direction of the motif. The images are examined to determine if the phantom and imaging system are properly aligned. In these phantom images, the projection of each sphere air cavity should be at the center of its corresponding torus, and the sphere air cavities and tori are visible from the image at energy variations from kV to MV, but may require adjustment of the window width and level of the image. This test is quite sensitive to angular misalignment, insensitive to magnification misalignment (useful for machines since the distance of the tube SAD can be 80cm or 100cm), and insensitive to translational misalignment. The cause of the deviation may be due to phantom placement, laser misalignment, or most importantly, the location of the source being misaligned relative to the isocenter. This test tells you whether the X-ray tube is in the wrong position or whether the laser light is out of calibration. The deviation of the sphere air cavity and the torus should be checked and solved before continuing the test. Typically, a deviation of the display of the sphere air cavity and the torus within 1 or 2mm indicates that the test passed and that the phantom is correctly positioned with respect to the imaging system.
CBCT isocenter bias measurement: and acquiring and reconstructing a CBCT image of the phantom. In this image, the sphere air cavity will be clearly visible and easily distinguishable. Registration of the phantom CBCT image with the reference CT image is performed using an automated tool. To save registration time, the registered region of interest may contain only five sphere air cavities. If further time savings are desired, a smaller region of interest may be used which contains only the three sphere air chambers closest to the isocenter of the phantom. The registration tool will determine the deviations between the CBCT and TPS iso-centres in the X, Y, Z direction and record these deviations. Typically this deviation should be less than 2mm in each direction. The measured deviation can be used as the deviation of the treatment couch for the day. The personnel in charge of QA should monitor these records periodically to check the system for drift or significant drift.
MV isocenter position detection: A-P and R-L MV projection images of the phantom are acquired. These images are registered with corresponding reference DRRs using automatic two-dimensional image matching techniques. The result of the image matching will show a deviation of the MV isocenter from the planned isocenter in the direction X, Y, Z. These values are recorded in a spreadsheet. These values should generally be less than 2mm in either direction.
Automatic bed calibration test-optional: and (5) positioning the die body according to the off-axis cross line. And acquiring a CBCT image of the phantom and a reference CT image of the phantom for registration. The known off-axis distance of the phantom is (-1.0, 1.4, 1.2) cm. for repositioning the phantom using an automatic bed alignment function. Another CBCT image of the phantom is acquired and registered with the phantom reference CT image. The phantom should now be within 2mm of the isocenter. The person in charge of QA should arrange the tests according to the requirements of the particular situation.
All coordinates in this specification are identified by x, y, z as directions, which directions are shown in fig. 1.
The phantom is made of materials which are easily purchased in the market, and the accuracy and the consistency of image registration or the verification of the displacement of a treatment bed can be realized according to the appearance of the designed spherical air cavity and the designed spherical rings in the projection images of the kV and/or MV of the phantom and the CBCT images of the kV and/or MV of the phantom. The use of a spherical air cavity ensures sufficient image contrast.
Claims (7)
1. A multifunctional image-guided verification die body is characterized in that: the bed is a low-density polyamide cube, and isocentric cross lines and off-axis cross lines are arranged on the upper surface of a die body, the left surface of the die body, the right surface of the die body, the outer surface of the die body and the inner surface of the die body and respectively indicate the positions of a treatment bed after initial and automatic positioning is finished; the center point of the off-axis cross line on the die body is positioned in an area defined by the right surface facing the die body and the inside of the die body, the center point of the off-axis cross line on the left surface of the die body is positioned in an area defined by the right surface facing the die body and the inside of the die body, the center point of the off-axis cross line on the right surface of the die body is positioned in an area defined by the upper surface facing the die body and the right surface facing the die body, the center point of the off-axis cross line on the outside of the die body is positioned in an area defined by the upper surface facing the die body and the right surface facing the die body, and the center point; the coordinate position of the off-axis cross line on each surface is symmetrical to the coordinate position of the off-axis cross line on the opposite surface of the die body; a shaft circular center ring is arranged at the cross center point of the isocentric cross line on each surface; the inside of the die body is fixed with a sphere air cavity, and the left surface of the die body is embedded with 5 circular rings which correspond to the 5 sphere air cavities respectively.
2. The phantom according to claim 1, wherein: the volume of the low density polyamide cubes was 16cm x 16 cm.
3. The phantom according to claim 1 or 2, wherein: 5 sphere air cavities are arranged in the die body, the diameter of the center sphere air cavity is 1.6cm, and the diameters of the other sphere air cavities are 1.2 cm; the sphere air cavity is fixed, the central sphere is positioned in the center of the die body, two spheres are positioned at outer positions relative to the isocenter, and two spheres are positioned at inner positions relative to the isocenter.
4. The phantom according to claim 1 or 2, wherein: the shaft center ring is two concentric circles with diameters of 4mm and 8 mm.
5. The phantom according to claim 1 or 2, wherein: light field indicating lines are arranged in front of and on the right side of the die body, and the light field indicating lines are three calibration square marks which take the central point of the isocenter cross line as the center and have the sizes of 4cm multiplied by 4cm, 10cm multiplied by 10cm and 12cm multiplied by 12 cm.
6. The phantom according to claim 1, wherein: the upper surface of the die body is also provided with a direction mark and a horizontal indicator; the direction marks are four characters of SUP, INF, L and R, the characters are respectively positioned at the end points of the isocenter cross line, the SUP characters are arranged on one side of the inner side of the explorator body, the INF characters are arranged on one side of the outer side of the explorator body, the L characters are arranged on one side of the left side of the explorator body, the R characters are arranged on one side of the right side of the explorator body, namely, the L and the R respectively represent the left and the right of a patient, the SUP represents the inner side, and the INF represents; the horizontal indicator is a circular indicator with a bubble at the center and is embedded in the upper surface of the die body.
7. The phantom according to claim 1 or 2, wherein: four end points of the isocentric cross line are close to the edge part of the die body, and scribed lines accurate to 5mm grids are arranged on the isocentric cross line.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115591135A (en) * | 2022-09-29 | 2023-01-13 | 中山大学肿瘤防治中心（中山大学附属肿瘤医院、中山大学肿瘤研究所）（Cn） | Multifunctional quality control method and mould body of treatment equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115591135A (en) * | 2022-09-29 | 2023-01-13 | 中山大学肿瘤防治中心（中山大学附属肿瘤医院、中山大学肿瘤研究所）（Cn） | Multifunctional quality control method and mould body of treatment equipment |
| CN115591135B (en) * | 2022-09-29 | 2023-05-05 | 中山大学肿瘤防治中心（中山大学附属肿瘤医院、中山大学肿瘤研究所） | Multifunctional quality control method and die body of treatment equipment |
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