WO2016010398A1 - 방사선 치료기 및 방사선 치료기의 정도 관리 방법 - Google Patents
방사선 치료기 및 방사선 치료기의 정도 관리 방법 Download PDFInfo
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- WO2016010398A1 WO2016010398A1 PCT/KR2015/007456 KR2015007456W WO2016010398A1 WO 2016010398 A1 WO2016010398 A1 WO 2016010398A1 KR 2015007456 W KR2015007456 W KR 2015007456W WO 2016010398 A1 WO2016010398 A1 WO 2016010398A1
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- radiation
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- reference image
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- center point
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1049—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1064—Monitoring, verifying, controlling systems and methods for adjusting radiation treatment in response to monitoring
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1075—Monitoring, verifying, controlling systems and methods for testing, calibrating, or quality assurance of the radiation treatment apparatus
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1049—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam
- A61N2005/1054—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam using a portal imaging system
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1075—Monitoring, verifying, controlling systems and methods for testing, calibrating, or quality assurance of the radiation treatment apparatus
- A61N2005/1076—Monitoring, verifying, controlling systems and methods for testing, calibrating, or quality assurance of the radiation treatment apparatus using a dummy object placed in the radiation field, e.g. phantom
Definitions
- Embodiments of the present invention relate to a radiation therapy device and a quality control method of a radiation therapy device, and more particularly, in the quality control method of a radiation therapy device using an image acquisition unit such as an EPID, It relates to a radiotherapy device and a quality control method of the radiation therapy device to correct this.
- Radiation therapy uses high-energy waves, such as X-rays, gamma rays, or high-energy particles, such as electron beams or protons, to damage or destroy target tissues, thereby delaying, preventing, or even extinguishing the growth of malignant tissues. Radiation therapy is used to treat not only cancer, but also benign tumors, medical diseases, and some skin diseases. Recently, in place of the neurosurgery method of dissecting the skull, a radiosurgical method of irradiating and treating a large amount of radiation at a time without an incision is also developed.
- high-energy waves such as X-rays, gamma rays, or high-energy particles, such as electron beams or protons
- Radiation therapy is not only used to treat tumors on their own, but is also used in conjunction with other surgical procedures to treat localized areas where the tumor is large and invasive, which makes it difficult or difficult to remove. It can be used to make surgical procedures easier or to destroy malignant cells left after surgery.
- Extracorporeal radiation therapy devices that irradiate radiation from outside may be classified into low energy X-ray therapy devices, radioisotope therapy devices, linear accelerators, particle accelerators, and the like, depending on the method of generating high energy particles or radiation.
- Low-energy X-ray treatment devices have been used for the treatment of skin diseases and heart using X-ray generators, but are rarely used at present.
- Radioisotope treatment devices utilize gamma rays that occur in radioisotopes, such as cobalt 60 (Co-60). It uses somewhat stronger energy gamma rays than low-energy X-ray therapy devices, but its use is gradually decreasing.
- Co-60 cobalt 60
- Linear accelerators are used as a standard for radiation therapy, capable of X-ray and electron beam output, delivering a variety of energy, and enabling high dose rates and beam-forming.
- Particle accelerators have a structure that transports the neutron or proton particles accelerated by the cyclotron accelerator through the beam transport tube and emits them to the desired area at the nozzle.
- the dose can be minimized and energy can be concentrated only in the deep tumors.
- such a medical radiation device intentionally changes the position of the patient, or the patient unconsciously moves the body, the less accurate the diagnosis, the more effective the treatment, the higher the radiation dose absorbed by the normal tissue around the lesion, the time and cost Will increase. Accordingly, the medical radiation apparatus has been developed in such a way that the radiation head and the detector are simply faced at fixed positions, and the radiation head and the detector are gradually moved around the patient.
- Recent medical radiation devices have evolved in such a way as to have a radiation emitting head mounted on a cancer gantry or a ring shaped gantry, with the radiation emitting head and the radiation detector facing each other with a living tissue interposed therebetween, Since the radiation detector must rotate around the biological tissue, a ring gantry structure or a C-arm gantry structure is mainly used.
- the background art described above is technical information possessed by the inventors for the derivation of the present invention or acquired during the derivation process of the present invention, and is not necessarily a publicly known technique disclosed to the general public before the application of the present invention.
- Embodiments of the present invention aim to provide a radiation therapy device and a quality management method of a radiation therapy device for calculating and correcting an error caused by a change in the position of the EPID in the quality management method of the radiation therapy device using an image acquisition unit such as EPID. do.
- One embodiment of the invention the main body; A gantry coupled to one side of the main body and formed to be rotatable in at least one direction with respect to the main body; Irradiation head is formed on one side of the gantry for irradiating radiation; An image acquisition unit which is formed to face the radiation head and detects radiation irradiated from the radiation head and converts it into an electrical signal to obtain an image; And a frame for acquiring a reference image formed on one side of the irradiation head and having a plurality of markers formed therein.
- the frame for acquiring the reference image may be formed in a window shape having an opening formed therein, and a plurality of markers may be formed in an edge area.
- a frame mounting guide may be formed at one side of the irradiation head, and the frame for acquiring the reference image may be fixedly coupled to the frame mounting guide.
- the image acquisition unit may be an electronic portal imaging device (EPID).
- EPID electronic portal imaging device
- the image acquisition unit may acquire a reference image including a plurality of the markers, one or more analysis target images, and analyze the analysis target image based on a beam center point calculated from the reference images. have.
- the image acquisition unit may compare the beam center point calculated from the reference image with the center point of the image acquisition unit, calculate a position error of the image acquisition unit, and reflect the calculated position error to reflect the analysis target. Analyze the image.
- the apparatus may further include a position error correction unit configured to move the gantry, the irradiation head, or the image acquisition unit in at least one direction.
- Another embodiment of the present invention comprises the steps of: a frame for obtaining a reference image formed with a plurality of markers on one side of the irradiation head; Irradiating radiation from the irradiation head to obtain a reference image including the plurality of markers; Calculating a beam center point from the reference image; Irradiating radiation from the irradiation head to obtain at least one analysis target image; And analyzing the analysis target image based on the beam center point calculated from the reference image.
- the analyzing of the analysis target image based on the beam center point calculated from the reference image may include: comparing the beam center point calculated from the reference image with the center point of the image acquisition unit, and determining the position of the image acquisition unit. Calculating an error; And analyzing the analysis target image by reflecting the calculated position error.
- the analyzing of the analysis target image by reflecting the calculated position error may include how far the center point of the analysis target image is spaced based on the beam center point BC calculated from the reference image. Can be analyzed based on whether or not.
- the radiation may be irradiated such that the plurality of markers are all included in the reference image.
- the reference image and the analysis target image may be obtained by an electronic portal imaging device.
- the method may further include correcting a position error by moving the gantry, the radiation head, or the image acquisition unit in at least one direction.
- the radiation therapy device and the quality control method of the radiation therapy device it is possible to calculate the error caused by the change in the position of the EPID to obtain the effect of correcting this.
- the EPID it is possible to avoid using a conventional radiation film, it is possible to obtain the effect of reducing the cost of using the film.
- FIG. 1 is a view showing a radiation therapy device according to an embodiment of the present invention.
- FIG. 2 and 3 are conceptual views schematically showing the radiation therapy device of FIG.
- FIG. 4 is a diagram illustrating a process of performing quality control using the radiation therapy device of FIG. 1.
- FIG. 5 is a flowchart illustrating a quality control method of a radiation therapy device according to an embodiment of the present invention.
- FIG. 1 is a view showing a radiation therapy device 100 according to an embodiment of the present invention
- Figure 2 is a conceptual diagram schematically showing the radiation therapy device 100 of FIG.
- the radiation therapy apparatus 100 includes a main body 110, a gantry 120, a radiation head 130, an image acquisition unit 140, and a bed unit. 150 and a frame 160 for obtaining a reference image. This will be described in more detail as follows.
- Radiotherapy is the treatment of cancer by focusing high doses of radiation on tumors.
- Successful radiotherapy requires treatment techniques that focus radiation on tumors with minimal disruption of surrounding normal organs, precise radiotherapy devices, and various imaging devices.
- EPID electronic portal imaging device
- the use of EPID in quality control has the advantage of being more convenient and more efficient than conventional methods, but the positional reproducibility of the EPID can be different from measurement to measurement, and the positional change of EPID due to gravity can occur during rotation of the gantry of the radiation therapy device. Therefore, there are many difficulties and limitations in performing quality control and analyzing images using EPID images. Accordingly, in order to perform quality control using EPID, a system for eliminating errors in EPID positions and improving accuracy of position errors is required by correcting images photographed at various gantry angles.
- the radiation therapy apparatus 100 includes a frame 160 for obtaining a reference image on one side of the gantry 120 to acquire a reference image, and then analyzes the analysis image by using the same. It is characterized by calculating and correcting a measurement error caused by the change in the position of the image acquisition unit 140, such as EPID. This will be described in more detail below.
- the main body 110 forms the base of the radiation therapy apparatus 100, and the reference of the rotation of the gantry 120, the radiation head 130, and the image acquisition unit 140 is determined. do.
- the gantry 120 is coupled to one side of the main body 110 and is formed to be rotatable in at least one direction with respect to the main body 110.
- the image acquisition unit 140 formed to face the radiation head 130 of the gantry 120 may rotate together with the gantry 120. That is, the gantry 120, the radiation head 130, and the image acquisition unit 140 are formed to be rotatable in the arrow A direction (or vice versa) of FIG. 1.
- a radiation head 130 for irradiating radiation On one side of the gantry 120, a radiation head 130 for irradiating radiation is formed.
- the radiation head 130 may emit X-rays, gamma rays, high energy electrons, high energy protons or other high energy fine particles.
- the radiation head 130 may include any one of an X-ray generator, a radioisotope source, or a linear accelerator.
- the radiation head 130 may receive and emit a high energy particle beam generated by accelerating in a particle accelerator installed outside the radiation therapy apparatus 100.
- the irradiation head 130 may be implemented as a multi-leaf collimator (MLC). By using the multi-leaf collimator, the irradiation head 130 can be beam-forming internally can enable more efficient radiation energy transfer.
- MLC multi-leaf collimator
- the frame mounting guide 131 may protrude in a direction in which the radiation is irradiated from the radiation head 130, and the frame 160 for obtaining a reference image may be coupled to the frame mounting guide 131.
- the image acquisition unit 140 is a kind of image sensor that detects radiation and converts it into an electrical signal to acquire an image.
- an electronic portal imaging device EPID
- the EPID technology is a technique for detecting an image of the radiation transmitted through the patient and converting the radiation into an electrical signal in order to confirm the location of the patient during radiation treatment using high energy radiation.
- the image acquisition unit 140 may acquire a reference image and an analysis target image, which will be described later.
- the bed unit 150 may be formed to lie down by the patient, and may be configured to move in the X-axis direction, the Y-axis direction, and the Z-axis direction with respect to the radiation emitted from the irradiation head 130.
- the frame 160 for obtaining the reference image may be formed as a kind of window having an opening formed therein, and a plurality of markers 161 may be formed at an edge portion thereof.
- the frame 160 for acquiring the reference image may be fixedly coupled to the radiation head 130 in a state of being fitted to the frame mounting guide 131 of the radiation head 130.
- the radiation therapy apparatus 100 may further include a position error correction unit (not shown).
- the position error correction unit may include a predetermined motor, an actuator, and the like, and are installed in at least one of the gantry 120, the radiation head 130, and the image acquisition unit 140, and the gantry 120.
- the radiation head 130 or the image acquisition unit 140 may be formed to be movable with respect to the X axis, the Y axis, or the Z axis.
- Such a position error correction unit (not shown) is provided, and by correcting the position error, it is possible to perform the quality control of the radiation therapy device.
- FIG. 4 is a diagram illustrating a process of performing quality control using the radiation therapy device of FIG. 1.
- the irradiation head 130 is disposed.
- the radiation R is irradiated from the image to obtain a reference image including the plurality of markers.
- the radiation R irradiated from the irradiation head 130 is irradiated to a sufficiently wide area so that the plurality of markers 161 formed at the edge of the frame 160 for obtaining the reference image are all included in the reference image. Can be.
- the beam center point BC is calculated from the obtained reference image.
- a beam center point BC may be calculated from, for example, the intersection point of the diagonals of four markers photographed on the reference image, or may be calculated from the center point in the horizontal / vertical rectangle formed by the four markers.
- the beam center point BC may be calculated from the reference image in various ways.
- the gantry 120, the radiation head 130, and the image acquisition unit 140 may rotate at an angle about the main body unit 110.
- the self-weight of the image acquisition unit 140 may be reduced.
- the position of the image acquisition unit 140 may change by a factor. That is, as shown in FIG. 3, when the gantry 120, the radiation head 130, and the image acquisition unit 140 rotate in the direction of arrow B about the main body unit 110, the image acquisition unit 140 is used.
- the position can be changed by the weight of. Therefore, as shown in FIG. 4B, an error D may occur between the center point EC of the image acquisition unit 140 itself and the beam center point BC calculated from the reference image.
- the analysis target image may be an image acquired every time the irradiation head 130 rotates 45 °, and in this case, a total of eight analysis target images may be obtained.
- the analysis is based on the beam center point BC calculated from the reference image, not the center point EC of the image acquisition unit 140 itself.
- the center point of the beam irradiation area in the above-described eight analysis target images is calculated, and how much the center point of the analysis target image thus calculated is based on the beam center point BC calculated from the reference image.
- quality control is performed by analyzing the analysis target image based on the beam center point BC calculated from the reference image, not the center point EC of the image acquisition unit 140 itself. To do.
- the gantry 120, the irradiation head 130, or the image using a position error corrector (not shown) installed in at least one of the gantry 120, the irradiation head 130, and the image acquisition unit 140.
- the position error may be corrected to perform quality control of the radiation therapy device.
- FIG. 5 is a flowchart illustrating a quality control method of a radiation therapy device according to an embodiment of the present invention.
- a frame for obtaining a reference image in which a plurality of markers are formed is disposed (operation S110), and radiation is irradiated from the irradiation head to include the plurality of markers.
- step S120 Obtaining a reference image (step S120), calculating a beam center point from the reference image (step S130), irradiating radiation from the irradiation head, and obtaining one or more analysis target images (step S140); Comparing the beam center point calculated from the reference image and the center point of the EPID, calculating the position error of the image acquisition unit (S150), and analyzing the analysis target image by reflecting the calculated position error (S160). Step).
- a frame for obtaining a reference image on which a plurality of markers are formed is disposed on one side of the irradiation head (S110).
- the frame 160 for obtaining the reference image may be formed as a kind of window having an opening formed therein, and a plurality of markers 161 may be formed at an edge portion thereof.
- the frame 160 for acquiring the reference image may be fixedly coupled to the radiation head 130 in a state of being fitted to the frame mounting guide 131 of the radiation head 130.
- a reference image including the plurality of markers is obtained (S120). That is, the radiation R is irradiated from the radiation head 130 while the frame 160 for obtaining a reference image in which the plurality of markers 161 are formed on one side of the radiation head 130 is disposed. A reference image including a plurality of markers is obtained.
- the radiation R irradiated from the irradiation head 130 is irradiated to a sufficiently wide area so that the plurality of markers 161 formed at the edge of the frame 160 for obtaining the reference image are all included in the reference image. Can be.
- the beam center point is calculated from the reference image (step S130).
- a beam center point BC may be calculated from, for example, the intersection point of the diagonals of four markers photographed on the reference image, or may be calculated from the center point in the horizontal / vertical rectangle formed by the four markers.
- the beam center point BC may be calculated from the reference image in various ways.
- the analysis target image may be an image acquired every time the irradiation head 130 rotates 45 °, in which case a total of eight analysis target images may be obtained.
- the beam center point calculated from the reference image is compared with the center point of the EPID to calculate a position error of the image acquisition unit (S150), and analyze the analysis target image by reflecting the calculated position error (S160). Step).
- the center points of the beam irradiation areas of the eight analysis images described above are calculated, and how far the center points of the analysis images thus calculated are separated from the beam center points BC calculated from the reference image. Can be checked. That is, when the center point of the analysis target image is spaced apart from the beam center point BC calculated from the reference image within a predetermined distance (for example, 1 mm), it is determined that the quality control passes, and when the center point is farther than the predetermined distance. As a result, it may be determined that the quality control has not passed, and a predetermined adjustment procedure for the radiation therapy apparatus 100 may be performed. As described above, quality control is performed by analyzing the analysis target image based on the beam center point BC calculated from the reference image, not the center point EC of the image acquisition unit 140 itself. To do.
- a predetermined distance for example, 1 mm
- the method may further include correcting a position error of at least one of the gantry 120, the radiation head 130, and the image acquisition unit 140. That is, the gantry 120, the irradiation head 130, or the image using a position error correction unit (not shown) installed in at least one of the gantry 120, the irradiation head 130, and the image acquisition unit 140.
- a position error correction unit installed in at least one of the gantry 120, the irradiation head 130, and the image acquisition unit 140.
- the position error may be corrected to perform quality control of the radiation therapy device.
- Embodiments of the present invention can be used in the radiation therapy device and the quality control method of the radiation therapy device.
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Abstract
Description
Claims (13)
- 본체부;상기 본체부의 일 측에 결합하며, 상기 본체부에 대해 적어도 일 방향으로 회전가능하도록 형성되는 갠트리;상기 갠트리의 일 측에 형성되어 방사선을 조사하는 방사선 조사 헤드;상기 방사선 조사 헤드와 마주보도록 형성되어 상기 방사선 조사 헤드에서 조사되는 방사선을 검출하고 이를 전기적 신호로 변환하여 영상을 획득하는 영상 획득부; 및상기 방사선 조사 헤드의 일 측에 형성되며 복수 개의 마커가 형성된 기준 영상 획득용 프레임;을 포함하는 방사선 치료기.
- 제 1 항에 있어서,상기 기준 영상 획득용 프레임은 내부에 개구부가 형성된 윈도우(window) 형태로 형성되며, 테두리 영역에 복수 개의 마커(marker)가 형성되는 것을 특징으로 하는 방사선 치료기.
- 제 1 항에 있어서,상기 방사선 조사 헤드의 일 측에는 프레임 장착 가이드가 형성되고, 상기 프레임 장착 가이드에 상기 기준 영상 획득용 프레임이 고정 결합되는 것을 특징으로 하는 방사선 치료기.
- 제 1 항에 있어서,상기 영상 획득부는 전자포탈영상장치(electronic portal imaging device, EPID)인 것을 특징으로 하는 방사선 치료기.
- 제 1 항에 있어서,상기 영상 획득부는,복수 개의 상기 마커가 포함된 기준 영상과, 하나 이상의 분석 대상 영상을 획득하고,상기 기준 영상으로부터 산출된 빔 중심점을 기준으로 상기 분석 대상 영상을 분석하는 것을 특징으로 하는 방사선 치료기.
- 제 5 항에 있어서,상기 영상 획득부는,상기 기준 영상으로부터 산출된 빔 중심점과 상기 영상 획득부의 중심점을 비교하여, 상기 영상 획득부의 위치 오차를 산출하고,상기 산출된 위치 오차를 반영하여 상기 분석 대상 영상을 분석하는 것을 특징으로 하는 방사선 치료기.
- 제 1 항에 있어서,상기 갠트리, 상기 방사선 조사 헤드 또는 상기 영상 획득부를 적어도 어느 일 방향으로 이동시킬 수 있도록 형성되는 위치 오차 보정부를 더 포함하는 방사선 치료기.
- 방사선 조사 헤드의 일 측에, 복수 개의 마커가 형성된 기준 영상 획득용 프레임이 배치되는 단계;상기 방사선 조사 헤드로부터 방사선이 조사되어, 상기 복수 개의 마커가 포함된 기준 영상이 획득되는 단계;상기 기준 영상으로부터 빔 중심점이 산출되는 단계;상기 방사선 조사 헤드로부터 방사선이 조사되어, 하나 이상의 분석 대상 영상이 획득되는 단계; 및상기 기준 영상으로부터 산출된 빔 중심점을 기준으로 상기 분석 대상 영상이 분석되는 단계;를 포함하는 방사선 치료기의 정도 관리 방법.
- 제 8 항에 있어서,상기 기준 영상으로부터 산출된 빔 중심점을 기준으로 상기 분석 대상 영상이 분석되는 단계는,상기 기준 영상으로부터 산출된 빔 중심점과 상기 영상 획득부의 중심점을 비교하여, 상기 영상 획득부의 위치 오차가 산출되는 단계; 및상기 산출된 위치 오차를 반영하여 상기 분석 대상 영상을 분석하는 단계;를 포함하는 방사선 치료기의 정도 관리 방법.
- 제 9 항에 있어서,상기 산출된 위치 오차를 반영하여 상기 분석 대상 영상을 분석하는 단계는,상기 분석 대상 영상의 중심점이 상기 기준 영상으로부터 산출된 빔 중심점(BC)을 기준으로 얼마만큼 이격되어 있는지를 여부에 기초하여 분석하는 것을 특징으로 하는 방사선 치료기의 정도 관리 방법.
- 제 8 항에 있어서,상기 방사선 조사 헤드로부터 방사선이 조사되어, 상기 복수 개의 마커가 포함된 기준 영상이 획득되는 단계는,상기 복수 개의 마커들이 모두 기준 영상에 포함되도록 상기 방사선이 조사되는 것을 특징으로 하는 방사선 치료기의 정도 관리 방법.
- 제 8 항에 있어서,상기 기준 영상 및 상기 분석 대상 영상은 전자포탈영상장치(electronic portal imaging device)에 의해 획득되는 것을 특징으로 하는 방사선 치료기의 정도 관리 방법.
- 제 8 항에 있어서,상기 갠트리, 상기 방사선 조사 헤드 또는 상기 영상 획득부를 적어도 어느 일 방향으로 이동하여 위치 오차를 보정하는 단계를 더 포함하는 방사선 치료기의 정도 관리 방법.
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