Description:Technical field of the invention
[0002] The present invention discloses a system for the combined accuracy verification of a gantry, a collimator and couch radiation isocenter. More specifically, the combined accuracy verification of the gantry collimator and couch radiation isocenter is evaluated by radiographic film and 2-dimensional (2D) array detector.
Background of the invention
[0003] The determination and analysis of radiation isocenter is crucial for radiation therapy. The high spatial accuracy is most significant in radiation treatments since they deliver large doses in a single session.
[0004] The minor displacements of radiation isocenter of around 1mm – 3mm have notable impact leading to uncertainty in the target positions and changes in dosimetry. The notable discrepancies in the accuracy of the radiation causes major side effects including positioning errors, loss of tumor coverage, and increased dosage to healthy cells.
[0005] The efficacy of the radiation delivered during the radiation therapy is majorly dependent on the verification and analysis of the radiation isocenter. Additionally, the determination of radiation isocenter is crucial for the commissioning and quality analysis testing of the irradiating radiotherapy.
[0006] The verification and analysis of radiation isocenter necessitates additional equipment, time and hence cost and labour resulting in delayed and reduced number of quality checks on the efficiency of the radiation delivered.
[0007] The optimization of positioning of collimator, gantry and couch is vital for achieving increased accuracy of radiation. In addition, accurate radiation further enables optimization of target range along with minimizing the exposure to surrounding healthy cells.
[0008] The Patent Application No. US9192784B1 entitled “Radiation delivery isocenter analysis tool” discloses a system comprising processor and a memory, the memory storing instructions executable by the processor. The computer is programmed to receive a set of first images, each of the first images including respective exposures of an image capture device to a beam of radiation. The components of the radiation delivery system are at respective specified orientations with respect to a three-dimensional coordinate system during each of the exposures. The system reconstructs respective beam images from each of the exposures by drawing a line at a predetermined angle to the first image and through a center of a radiation beam shown on each first image and combines the reconstructed beam images on a second image. The system comprises multiple components of radiation delivery device gantry, a collimator, a multi-leaf collimator, and a patient couch. The exposure is achieved by moving one of the components through successive angles of rotation.
[0009] The Patent Application No. US2021275831A1 entitled “SYSTEM, PROCESS AND APPARATUS TO DETERMINE LINAC ISOCENTER” discloses a LINAC mechanical isocenter and a process comprising steps of mounting a signal emitter module on a collimator, mounting a signal receiver module at a location with an unobstructed view of the signal emitter module, determining an axis rotation for a gantry by rotating the gantry while the signal receiver module acquires signal emitter module positions, determining an axis of rotation for the collimator by rotating the collimator while the signal receiver module acquires signal emitter module positions during the collimator rotation, and determining the LINAC mechanical isocenter by processing signal emitter module positions during the collimator rotation and the gantry rotation.
[0010] The Patent Application No. WO2020209665A1 entitled “RADIATION ISOCENTER QUALITY ASSURANCE SYSTEM AND METHOD FOR DIAGNOSIS AND TREATMENT APPARATUS USING RADIATION” discloses a radiation isocenter quality assurance system comprising a gantry capable of rotating around a rotating shaft, a radiation irradiating unit fixed to the gantry to rotate with the gantry, a collimator inserted into the radiation irradiating unit, an isocenter measurement module comprising a pair of first radiation reaction members, a control unit to control the rotation of the gantry and the irradiation of radiation through the radiating irradiating unit, and a three-dimensional coordinate calculation unit which calculates the radiation isocenter from location information. The control unit aids in irradiating radiation to the pair of first radiation reaction members while fixing the gantry and rotating the collimator and irradiates radiation to the pair of second radiation reaction members while fixing the collimator and rotating the gantry obtaining the radiation isocenter.
[0011] Although, several radiation isocenter verification devices exist, they tend to be inaccessible, time consuming and exhibit decreased efficacy. Hence there is a need for a combined radiation accuracy verification system of gantry, collimator and couch exhibiting high levels of accuracy, efficacy and precision.
Summary of the invention
[0012] The present invention overcomes the drawbacks of the existing radiation isocenter verification devices. The present invention discloses a system for combined radiation isocenter verification with enhanced efficacy and accuracy.
[0013] The present invention discloses a system for the combined accuracy verification of the gantry, the collimator and couch radiation isocenter. The combined accuracy verification of the gantry, the collimator and couch radiation isocenter is evaluated by radiographic film and 2D array detector.
[0014] The combined accuracy verification of gantry, collimator and couch radiation isocenter by radiographic film is evaluated by sandwiching the radiographic film between the slab phantom and the film is aligned to isocenter based on laser, open predefined field sizes and beam parameters, set gantry and collimator theta angle at 0°, irradiating the beam at couch angles 0°, 25° and 335°, set gantry and couch theta at 0°, irradiating the beam at collimator theta angles 60°, 90° and 300°, set the collimator theta angles and couch theta at 0°, irradiating the beam at gantry angles 45°, 105°, 255° and 315°, analyzing the exposed film images and calculating radiation isocenter.
[0015] The combined accuracy verification of gantry, collimator and couch radiation isocenter by 2-Dimensional (2D) array detector is evaluated by aligning the 2D array detector with isocenter based on laser, open predefined field sizes and beam parameters, set gantry and collimator theta angle at 0°, irradiating the beam at couch angles 0°, 25° and 335°, set gantry and couch theta at 0 °, irradiating the beam at collimator theta angles 60°, 90° and 300°, set the collimator theta angles and couch theta at 0°, irradiating the beam at 45°, 105°, 255° and 315° gantry angles, analyzing the exposed dosimetry by integrated software and calculating radiation isocenter.
[0016] The present invention discloses a system aiding in the generation of star shot pattern of the irradiated radiographic film and 2D array detector based on simultaneous changes of angles of rotation of gantry, collimator and the patient couch. The combined accuracy verification exhibits enhanced efficacy, high precision, streamlined verification and is accessible.
Brief description of the drawings
[0017] The foregoing and other features of embodiments will become more apparent from the following detailed description of embodiments when read in conjunction with the accompanying drawings.
[0018] FIG 1 illustrates the combined radiation isocenter accuracy verification system.
[0019] FIG 2 illustrates the combined radiation isocenter accuracy verification system comprising a radiographic film.
[0020] FIG 2-A illustrates the system setup with radiographic film for isocenter accuracy verification.
[0021] FIG 2-B illustrates the system setup with 2D array detector for isocenter accuracy verification
Detailed description of the invention
[0022] In order to more clearly and concisely describe and point out the subject matter of the claimed invention, the following definitions are provided for specific terms, which are used in the following written description.
[0023] The term “Collimator” refers to a device to collimate beams of radiation and help to direct the beam of radiation to desired shape and can limit the maximum field size of a beam.
[0024] The term “Radiation isocenter” refers to a set of points established by the intersection of the central axis of the radiation beam when gantry, collimator and couch is rotated.
[0025] The present invention discloses a system for the combined accuracy verification of gantry, collimator and couch radiation isocenter. The combined accuracy verification of gantry collimator and couch radiation isocenter is evaluated by radiographic film and 2D array detector. The combined accuracy verification exhibits enhanced efficacy, streamlined and accessible.
[0026] FIG 1 illustrates the combined radiation isocenter accuracy verification system. FIG 2 illustrates the combined radiation isocenter accuracy verification system comprising a radiographic film and FIG 2-A illustrates the system setup with radiographic film for isocenter accuracy verification. The system (200-A) with radiographic film (200) comprises a gantry (101), a collimator (102), a radiographic film (200) and a patient couch (103). The radiographic film (200) is mounted on the patient couch (103). The center mark of the verification system (200) is aligned with the isocenter of the system (200-A) on the basis of laser position. The radiographic film (200) is mounted on the patient couch (103) for combined star shot test. Pre-defined field size is opened and beam parameters are set for the system set-up (200-A). The theta angle of the gantry (101) and the theta angle of the collimator (102) is set at 0°. The beam is irradiated at the couch angles 0°, 25° and 335°. The theta angles of gantry (101) and couch angles are set at 0° and the beam is irradiated at collimator theta angles 60°, 90° and 300°. The theta angles of collimator (102) and couch (103) are set at 0° and the beam is irradiated at gantry angles 45°, 105°, 255° and 315°. The exposed radiographic film (200) is scanned with a scanner and the scanned images are analyzed. The diameter of the combined colli theta, couch theta and gantry radiation isocenter is evaluated on the basis of the sofware analysis of the images.
[0027] According to another embodiment of the invention the combined accuracy verification of gantry, collimator and couch radiation isocenter is evaluated by 2D array detector. The 2D array detector (104) is mounted on the patient couch (103) for combined star shot test. FIG 2-B illustrates the system setup with 2D array detector for isocenter accuracy verification. The system (200-B) with 2D array detector (104) comprises a gantry (101), a collimator (102), a 2D array detector (104) and a patient couch (103). The center mark of the verification system (104) aligns with the isocenter of the system (200-B) based on laser position. The 2D array detector (104) is mounted on the patient couch for combined star shot test. The theta angle of the gantry (101) and the collimator (102) is set at 0° and beam is irradiated for the at the couch angles 0°, 25° and 335°. The theta angle of the gantry (101) and the couch theta is set at 0° and beam is irradiated at angles of 60°, 90° and 300°. The theta angle of the collimator (102) and the theta angle of the couch is set at 0° and beam is irradiated at gantry angles of 45°, 105°, 255° and 315°. The diameter of the combined colli theta, couch theta and gantry radiation isocenter is evaluated by built in software analysis of exposed 2D array detector (104).
[0028] The system aids in the generation of star shot pattern of the irradiated radiographic film (200) and 2D array detector (104) based on simultaneous changes of angles of rotation of gantry, collimator and the patient couch. The exposed radiographic film (200) is scanned for software analysis and the exposed 2D array detector (104) is evaluated by integrated software analysis.
[0029] The present invention discloses a system for the combined accuracy verification of gantry, collimator and couch radiation isocenter. The combined accuracy verification of gantry collimator and couch radiation isocenter is evaluated by radiographic film (200) and 2D array detector (104). The system aids in the generation of star shot pattern of the irradiated radiographic film (200) and 2D array detector (104) based on simultaneous changes of angles of rotation of gantry, collimator and the patient couch. The exposed radiographic film (200) is scanned for software analysis and the exposed 2D array detector (104) is evaluated by integrated software analysis. The combined accuracy verification exhibits enhanced efficacy, high precision, streamlined verification and is accessible.
Reference numbers:
Components Reference Numbers
System 200-A & 200-B
Radiographic film with isocenter verification system 200
2D array detector with isocenter verification system 104
Gantry 101
Collimator 102
Patient couch 103
, Claims:Technical field of the invention
[0002] The present invention discloses a system for the combined accuracy verification of a gantry, a collimator and couch radiation isocenter. More specifically, the combined accuracy verification of the gantry collimator and couch radiation isocenter is evaluated by radiographic film and 2-dimensional (2D) array detector.
Background of the invention
[0003] The determination and analysis of radiation isocenter is crucial for radiation therapy. The high spatial accuracy is most significant in radiation treatments since they deliver large doses in a single session.
[0004] The minor displacements of radiation isocenter of around 1mm – 3mm have notable impact leading to uncertainty in the target positions and changes in dosimetry. The notable discrepancies in the accuracy of the radiation causes major side effects including positioning errors, loss of tumor coverage, and increased dosage to healthy cells.
[0005] The efficacy of the radiation delivered during the radiation therapy is majorly dependent on the verification and analysis of the radiation isocenter. Additionally, the determination of radiation isocenter is crucial for the commissioning and quality analysis testing of the irradiating radiotherapy.
[0006] The verification and analysis of radiation isocenter necessitates additional equipment, time and hence cost and labour resulting in delayed and reduced number of quality checks on the efficiency of the radiation delivered.
[0007] The optimization of positioning of collimator, gantry and couch is vital for achieving increased accuracy of radiation. In addition, accurate radiation further enables optimization of target range along with minimizing the exposure to surrounding healthy cells.
[0008] The Patent Application No. US9192784B1 entitled “Radiation delivery isocenter analysis tool” discloses a system comprising processor and a memory, the memory storing instructions executable by the processor. The computer is programmed to receive a set of first images, each of the first images including respective exposures of an image capture device to a beam of radiation. The components of the radiation delivery system are at respective specified orientations with respect to a three-dimensional coordinate system during each of the exposures. The system reconstructs respective beam images from each of the exposures by drawing a line at a predetermined angle to the first image and through a center of a radiation beam shown on each first image and combines the reconstructed beam images on a second image. The system comprises multiple components of radiation delivery device gantry, a collimator, a multi-leaf collimator, and a patient couch. The exposure is achieved by moving one of the components through successive angles of rotation.
[0009] The Patent Application No. US2021275831A1 entitled “SYSTEM, PROCESS AND APPARATUS TO DETERMINE LINAC ISOCENTER” discloses a LINAC mechanical isocenter and a process comprising steps of mounting a signal emitter module on a collimator, mounting a signal receiver module at a location with an unobstructed view of the signal emitter module, determining an axis rotation for a gantry by rotating the gantry while the signal receiver module acquires signal emitter module positions, determining an axis of rotation for the collimator by rotating the collimator while the signal receiver module acquires signal emitter module positions during the collimator rotation, and determining the LINAC mechanical isocenter by processing signal emitter module positions during the collimator rotation and the gantry rotation.
[0010] The Patent Application No. WO2020209665A1 entitled “RADIATION ISOCENTER QUALITY ASSURANCE SYSTEM AND METHOD FOR DIAGNOSIS AND TREATMENT APPARATUS USING RADIATION” discloses a radiation isocenter quality assurance system comprising a gantry capable of rotating around a rotating shaft, a radiation irradiating unit fixed to the gantry to rotate with the gantry, a collimator inserted into the radiation irradiating unit, an isocenter measurement module comprising a pair of first radiation reaction members, a control unit to control the rotation of the gantry and the irradiation of radiation through the radiating irradiating unit, and a three-dimensional coordinate calculation unit which calculates the radiation isocenter from location information. The control unit aids in irradiating radiation to the pair of first radiation reaction members while fixing the gantry and rotating the collimator and irradiates radiation to the pair of second radiation reaction members while fixing the collimator and rotating the gantry obtaining the radiation isocenter.
[0011] Although, several radiation isocenter verification devices exist, they tend to be inaccessible, time consuming and exhibit decreased efficacy. Hence there is a need for a combined radiation accuracy verification system of gantry, collimator and couch exhibiting high levels of accuracy, efficacy and precision.
Summary of the invention
[0012] The present invention overcomes the drawbacks of the existing radiation isocenter verification devices. The present invention discloses a system for combined radiation isocenter verification with enhanced efficacy and accuracy.
[0013] The present invention discloses a system for the combined accuracy verification of the gantry, the collimator and couch radiation isocenter. The combined accuracy verification of the gantry, the collimator and couch radiation isocenter is evaluated by radiographic film and 2D array detector.
[0014] The combined accuracy verification of gantry, collimator and couch radiation isocenter by radiographic film is evaluated by sandwiching the radiographic film between the slab phantom and the film is aligned to isocenter based on laser, open predefined field sizes and beam parameters, set gantry and collimator theta angle at 0°, irradiating the beam at couch angles 0°, 25° and 335°, set gantry and couch theta at 0°, irradiating the beam at collimator theta angles 60°, 90° and 300°, set the collimator theta angles and couch theta at 0°, irradiating the beam at gantry angles 45°, 105°, 255° and 315°, analyzing the exposed film images and calculating radiation isocenter.
[0015] The combined accuracy verification of gantry, collimator and couch radiation isocenter by 2-Dimensional (2D) array detector is evaluated by aligning the 2D array detector with isocenter based on laser, open predefined field sizes and beam parameters, set gantry and collimator theta angle at 0°, irradiating the beam at couch angles 0°, 25° and 335°, set gantry and couch theta at 0 °, irradiating the beam at collimator theta angles 60°, 90° and 300°, set the collimator theta angles and couch theta at 0°, irradiating the beam at 45°, 105°, 255° and 315° gantry angles, analyzing the exposed dosimetry by integrated software and calculating radiation isocenter.
[0016] The present invention discloses a system aiding in the generation of star shot pattern of the irradiated radiographic film and 2D array detector based on simultaneous changes of angles of rotation of gantry, collimator and the patient couch. The combined accuracy verification exhibits enhanced efficacy, high precision, streamlined verification and is accessible.
Brief description of the drawings
[0017] The foregoing and other features of embodiments will become more apparent from the following detailed description of embodiments when read in conjunction with the accompanying drawings.
[0018] FIG 1 illustrates the combined radiation isocenter accuracy verification system.
[0019] FIG 2 illustrates the combined radiation isocenter accuracy verification system comprising a radiographic film.
[0020] FIG 2-A illustrates the system setup with radiographic film for isocenter accuracy verification.
[0021] FIG 2-B illustrates the system setup with 2D array detector for isocenter accuracy verification
Detailed description of the invention
[0022] In order to more clearly and concisely describe and point out the subject matter of the claimed invention, the following definitions are provided for specific terms, which are used in the following written description.
[0023] The term “Collimator” refers to a device to collimate beams of radiation and help to direct the beam of radiation to desired shape and can limit the maximum field size of a beam.
[0024] The term “Radiation isocenter” refers to a set of points established by the intersection of the central axis of the radiation beam when gantry, collimator and couch is rotated.
[0025] The present invention discloses a system for the combined accuracy verification of gantry, collimator and couch radiation isocenter. The combined accuracy verification of gantry collimator and couch radiation isocenter is evaluated by radiographic film and 2D array detector. The combined accuracy verification exhibits enhanced efficacy, streamlined and accessible.
[0026] FIG 1 illustrates the combined radiation isocenter accuracy verification system. FIG 2 illustrates the combined radiation isocenter accuracy verification system comprising a radiographic film and FIG 2-A illustrates the system setup with radiographic film for isocenter accuracy verification. The system (200-A) with radiographic film (200) comprises a gantry (101), a collimator (102), a radiographic film (200) and a patient couch (103). The radiographic film (200) is mounted on the patient couch (103). The center mark of the verification system (200) is aligned with the isocenter of the system (200-A) on the basis of laser position. The radiographic film (200) is mounted on the patient couch (103) for combined star shot test. Pre-defined field size is opened and beam parameters are set for the system set-up (200-A). The theta angle of the gantry (101) and the theta angle of the collimator (102) is set at 0°. The beam is irradiated at the couch angles 0°, 25° and 335°. The theta angles of gantry (101) and couch angles are set at 0° and the beam is irradiated at collimator theta angles 60°, 90° and 300°. The theta angles of collimator (102) and couch (103) are set at 0° and the beam is irradiated at gantry angles 45°, 105°, 255° and 315°. The exposed radiographic film (200) is scanned with a scanner and the scanned images are analyzed. The diameter of the combined colli theta, couch theta and gantry radiation isocenter is evaluated on the basis of the sofware analysis of the images.
[0027] According to another embodiment of the invention the combined accuracy verification of gantry, collimator and couch radiation isocenter is evaluated by 2D array detector. The 2D array detector (104) is mounted on the patient couch (103) for combined star shot test. FIG 2-B illustrates the system setup with 2D array detector for isocenter accuracy verification. The system (200-B) with 2D array detector (104) comprises a gantry (101), a collimator (102), a 2D array detector (104) and a patient couch (103). The center mark of the verification system (104) aligns with the isocenter of the system (200-B) based on laser position. The 2D array detector (104) is mounted on the patient couch for combined star shot test. The theta angle of the gantry (101) and the collimator (102) is set at 0° and beam is irradiated for the at the couch angles 0°, 25° and 335°. The theta angle of the gantry (101) and the couch theta is set at 0° and beam is irradiated at angles of 60°, 90° and 300°. The theta angle of the collimator (102) and the theta angle of the couch is set at 0° and beam is irradiated at gantry angles of 45°, 105°, 255° and 315°. The diameter of the combined colli theta, couch theta and gantry radiation isocenter is evaluated by built in software analysis of exposed 2D array detector (104).
[0028] The system aids in the generation of star shot pattern of the irradiated radiographic film (200) and 2D array detector (104) based on simultaneous changes of angles of rotation of gantry, collimator and the patient couch. The exposed radiographic film (200) is scanned for software analysis and the exposed 2D array detector (104) is evaluated by integrated software analysis.
[0029] The present invention discloses a system for the combined accuracy verification of gantry, collimator and couch radiation isocenter. The combined accuracy verification of gantry collimator and couch radiation isocenter is evaluated by radiographic film (200) and 2D array detector (104). The system aids in the generation of star shot pattern of the irradiated radiographic film (200) and 2D array detector (104) based on simultaneous changes of angles of rotation of gantry, collimator and the patient couch. The exposed radiographic film (200) is scanned for software analysis and the exposed 2D array detector (104) is evaluated by integrated software analysis. The combined accuracy verification exhibits enhanced efficacy, high precision, streamlined verification and is accessible.
Reference numbers:
Components Reference Numbers
System 200-A & 200-B
Radiographic film with isocenter verification system 200
2D array detector with isocenter verification system 104
Gantry 101
Collimator 102
Patient couch 103