WO2011093183A1 - Procédé de mesure de distribution bidimensionnelle de dose radiologique en utilisant un fantôme 3d - Google Patents

Procédé de mesure de distribution bidimensionnelle de dose radiologique en utilisant un fantôme 3d Download PDF

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Publication number
WO2011093183A1
WO2011093183A1 PCT/JP2011/050841 JP2011050841W WO2011093183A1 WO 2011093183 A1 WO2011093183 A1 WO 2011093183A1 JP 2011050841 W JP2011050841 W JP 2011050841W WO 2011093183 A1 WO2011093183 A1 WO 2011093183A1
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phantom
dose
measuring
radiation
distribution
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PCT/JP2011/050841
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English (en)
Japanese (ja)
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修一 小澤
智久 古谷
基敬 川嶋
千恵 黒河
久美子 唐澤
啓資 笹井
宏 大西
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学校法人順天堂
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Priority to JP2011551814A priority Critical patent/JP5504509B2/ja
Publication of WO2011093183A1 publication Critical patent/WO2011093183A1/fr

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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/16—Measuring radiation intensity
    • G01T1/169—Exploration, location of contaminated surface areas

Definitions

  • the present invention relates to a method for measuring a two-dimensional distribution of radiation absorbed dose using a 3D phantom implemented in the field of radiotherapy.
  • the absorbed dose using a 3D phantom (three-dimensional model) is used to verify whether the results obtained in the treatment plan are correct. Compare the measured and calculated two-dimensional distributions.
  • the coronal plane and the sagittal plane are measured and compared with the calculation results.
  • a radiation dose measuring body 20 such as an X-ray film is sandwiched between the stacked 3D phantoms 50 and irradiated, and then FIG. As shown in 2), the 3D phantom 50 sandwiching the radiation dose measuring body 20 is rotated by 90 ° to perform irradiation, and the dose distribution on the sagittal surface is measured (for example, see Non-Patent Document 1).
  • the close contact between the 3D phantom 50 and the radiation dose measuring body 20 is increased by the dead weight of the 3D phantom 50, and it takes less time for installation, so that the measurement accuracy is high and the reproducibility of the measurement is also high.
  • the degree of adhesion cannot be increased due to the weight of the 3D phantom 50, which causes a problem that the measurement accuracy is lowered and the reproducibility is deteriorated.
  • the 3D phantom 50 is sandwiched with a clamp 60 or the like to increase the degree of adhesion.
  • the present invention has been made in view of the above-described conventional problems and actual situations, and can perform two-dimensional distribution measurement of a radiation absorbed dose using a 3D phantom efficiently and accurately with high reproducibility.
  • the challenge is to provide a method that can do this.
  • the present inventor conducted a 3D phantom having a 90 ° rotationally symmetric sectional shape instead of rotating the 3D phantom by 90 ° for dose distribution measurement on the sagittal surface. If the gantry of the radiation therapy device is rotated 90 ° and irradiated with radiation, the measurement accuracy on the sagittal surface will be as high as that on the coronal surface, and results with good reproducibility will be obtained. As a result, the present invention has been completed.
  • the present invention includes a step of holding a radiation dose measuring body in a horizontal state between a 3D phantom composed of two upper and lower divided bodies having a 90 ° rotationally symmetric sectional shape; and holding the radiation dose measuring body in a horizontal state.
  • the radiation dose measuring body in measuring not only the coronal plane but also the sagittal plane, the radiation dose measuring body is held horizontally between the 3D phantoms. Therefore, the degree of adhesion with the radiation dose measuring body by the weight of the 3D phantom. Therefore, the two-dimensional distribution of radiation dose can be measured with high accuracy.
  • the rotation of the gantry can be easily operated by the controller of the radiotherapy device (linac), it is possible to perform measurement more efficiently and with higher reproducibility than the conventional rotation operation of the 3D phantom by a clamp or the like.
  • 10 is a 3D phantom, which is composed of two divided parts of an upper phantom part 10a and a lower phantom part 10b, and becomes symmetric when rotated by 90 °, such as a square or an octagon. It has a cross-sectional shape.
  • the radiation dose measuring body 20 is set up between the upper phantom portion 10a and the lower phantom portion 10b of the 3D phantom 10, and the radiation dose measuring body 20 is held in a horizontal state.
  • the radiation dose measuring body 20 may be any type as long as it can measure the radiation dose.
  • an X-ray film, an imaging plate, a two-dimensional diode detector, a two-dimensional ionization chamber. A detector or the like is used.
  • the dose distribution on the coronal surface is measured by irradiating the 3D phantom 10 holding the radiation dose measuring body 20 in a horizontal state with the gantry 30a, 30b, 30c, 30d, 30e of the radiotherapy device (linac). (See FIG. 1 (1)).
  • the controller (not shown) rotates the gantry 30a, 30b, 30c, 30d, 30e by 90 °, and in that state, the 3D phantom 10 is irradiated with radiation to irradiate the sagittal surface.
  • the dose distribution is measured (see FIG. 1 (2)). Note that the 90 ° rotation direction may be clockwise or counterclockwise, and the position where the film is sandwiched may not be the center of the phantom.
  • the actual measurement value obtained is verified by comparing with the calculated value on the coronal surface and sagittal surface obtained by the same procedure as the normal method, whether the result obtained in the treatment plan is correct. .
  • 3D phantom 10a Upper phantom part 10b: Lower phantom part 20: Radiation dose measuring body 30a, 30b, 30c, 30d, 30e: Gantry 50: Conventional 3D phantom 60: Clamp

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Radiation-Therapy Devices (AREA)
  • Measurement Of Radiation (AREA)

Abstract

L'invention concerne un procédé permettant de mesurer efficacement et avec précision la distribution bidimensionnelle d'une dose radiologique en utilisant un fantôme 3D et selon une reproductibilité élevée. Le procédé comprend : une étape consistant à maintenir un corps de mesure de dose de radiation de sorte que le corps de mesure est dans une position horizontale entre les fantômes 3D qui sont formés par des corps séparables supérieur et inférieur et dont les formes des sections transversales sont symétriques selon un angle à 90° ; une étape consistant à mesurer une distribution de dose dans un plan coronal en émettant des rayons radiaux sur le fantôme 3D qui maintient le corps de mesure de dose de radiation en position horizontale en utilisant les portiques d'un dispositif de radiothérapie ; et une étape consistant à mesurer une distribution de dose dans le plan sagittal en émettant des rayons radiaux sur le fantôme 3D après rotation des portiques sur 90° sans modifier la position du fantôme 3D.
PCT/JP2011/050841 2010-01-28 2011-01-19 Procédé de mesure de distribution bidimensionnelle de dose radiologique en utilisant un fantôme 3d WO2011093183A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011551814A JP5504509B2 (ja) 2010-01-28 2011-01-19 ３ｄファントムを用いた放射線吸収線量の２次元分布測定方法

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JP2010016205 2010-01-28
JP2010-016205 2010-01-28

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WO2011093183A1 true WO2011093183A1 (fr) 2011-08-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102997992A (zh) * 2012-11-26 2013-03-27 复旦大学 一种光剂量计

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008087952A1 (fr) * 2007-01-16 2008-07-24 National University Corporation Okayama University Procédé de mesure de dose et fantôme, et dispositif de collecte d'images par rayons x utilisé pour le procédé de mesure de dose

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008087952A1 (fr) * 2007-01-16 2008-07-24 National University Corporation Okayama University Procédé de mesure de dose et fantôme, et dispositif de collecte d'images par rayons x utilisé pour le procédé de mesure de dose

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TORU KOJIMA: "3. Senryo Kensho no Jissai", JAPANESE SOCIETY OF RADIOLOGICAL TECHNOLOGY HOSHASEN CHIRYO BUNKAKAISHI, vol. 23, no. 1, April 2009 (2009-04-01) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102997992A (zh) * 2012-11-26 2013-03-27 复旦大学 一种光剂量计

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JP5504509B2 (ja) 2014-05-28
JPWO2011093183A1 (ja) 2013-06-06

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