Positioning accuracy of a new image-guided radiotherapy system

Purpose: To evaluate the accuracy of the patient-positioning function of a newly developed image-guided radiotherapy system, the MHI-TM2000 (Mitsubishi Heavy Industries, Ltd., Japan). Methods: The isocenter positions prescribed by the lasers, MV treatment beam, and image guidance systems (kV X-ray i...

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Vydané v:	Medical physics (Lancaster) Ročník 38; číslo 5; s. 2535 - 2541
Hlavní autori:	Miyabe, Yuki, Sawada, Akira, Takayama, Kenji, Kaneko, Shuji, Mizowaki, Takashi, Kokubo, Masaki, Hiraoka, Masahiro
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	United States American Association of Physicists in Medicine 01.05.2011
Predmet:	Cameras Computed radiography Computed tomography Computer-Aided Design computerised tomography Cone beam computed tomography Cone-beam CT diagnostic radiography Equipment Design Equipment Failure Analysis - methods image fusion Image guided radiation therapy image reconstruction Image sensors Image-guided radiotherapy (IGRT) Infrared detectors kV X-ray image medical image processing Medical imaging Medical X‐ray imaging phantoms position measurement Positioning accuracy radiation therapy Radiotherapy, Computer-Assisted - instrumentation Radiotherapy, Conformal - methods Reconstruction Robotics Therapeutic applications, including brachytherapy Tomography, X-Ray Computed - instrumentation X‐ray imaging Cone-beam CT Image-guided radiotherapy (IGRT) Positioning accuracy image fusion kV X-ray image
ISSN:	0094-2405, 2473-4209
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Abstract	Purpose: To evaluate the accuracy of the patient-positioning function of a newly developed image-guided radiotherapy system, the MHI-TM2000 (Mitsubishi Heavy Industries, Ltd., Japan). Methods: The isocenter positions prescribed by the lasers, MV treatment beam, and image guidance systems (kV X-ray image and kV-CBCT) were calculated using a cube phantom with a 10-mm-diameter steel ball fixed to the center of the phantom. Then, their location discrepancies were estimated. In addition, to verify the scale and orientation of the coordinate axes of the kV X-ray imaging system, positional measurements were repeated with the phantom placed at 50 mm off-isocenter along the vertical, longitudinal, and lateral directions, respectively. Further, image fusions of an anthropomorphic phantom image and the corresponding image translated by a pre-determined amount were performed. Results: The isocenter alignment among the coordinate systems was coincident within 0.5 mm in translation for the vertical, longitudinal, and lateral axes, respectively. The geometrical errors at 50 mm off-isocenter for kV X-ray images and CBCT were within 0.2 mm and 1.0 mm, respectively. The image fusion errors were within 1.0 mm in translation and 1.0° in rotation, respectively. No significant difference in the image fusion accuracy was observed between the chest and pelvis phantoms. Conclusions: The isocenter alignment among the coordinate systems was performed with high accuracy. Furthermore, the automatic image fusion function achieved sufficient patient positioning accuracy and precision for image-guided radiotherapy.
AbstractList	Purpose: To evaluate the accuracy of the patient‐positioning function of a newly developed image‐guided radiotherapy system, the MHI‐TM2000 (Mitsubishi Heavy Industries, Ltd., Japan). Methods: The isocenter positions prescribed by the lasers, MV treatment beam, and image guidance systems (kV X‐ray image and kV‐CBCT) were calculated using a cube phantom with a 10‐mm‐diameter steel ball fixed to the center of the phantom. Then, their location discrepancies were estimated. In addition, to verify the scale and orientation of the coordinate axes of the kV X‐ray imaging system, positional measurements were repeated with the phantom placed at 50 mm off‐isocenter along the vertical, longitudinal, and lateral directions, respectively. Further, image fusions of an anthropomorphic phantom image and the corresponding image translated by a pre‐determined amount were performed. Results: The isocenter alignment among the coordinate systems was coincident within 0.5 mm in translation for the vertical, longitudinal, and lateral axes, respectively. The geometrical errors at 50 mm off‐isocenter for kV X‐ray images and CBCT were within 0.2 mm and 1.0 mm, respectively. The image fusion errors were within 1.0 mm in translation and 1.0° in rotation, respectively. No significant difference in the image fusion accuracy was observed between the chest and pelvis phantoms. Conclusions: The isocenter alignment among the coordinate systems was performed with high accuracy. Furthermore, the automatic image fusion function achieved sufficient patient positioning accuracy and precision for image‐guided radiotherapy. To evaluate the accuracy of the patient-positioning function of a newly developed image-guided radiotherapy system, the MHI-TM2000 (Mitsubishi Heavy Industries, Ltd., Japan). The isocenter positions prescribed by the lasers, MV treatment beam, and image guidance systems (kV X-ray image and kV-CBCT) were calculated using a cube phantom with a 10-mm-diameter steel ball fixed to the center of the phantom. Then, their location discrepancies were estimated. In addition, to verify the scale and orientation of the coordinate axes of the kV X-ray imaging system, positional measurements were repeated with the phantom placed at 50 mm off-isocenter along the vertical, longitudinal, and lateral directions, respectively. Further, image fusions of an anthropomorphic phantom image and the corresponding image translated by a pre-determined amount were performed. The isocenter alignment among the coordinate systems was coincident within 0.5 mm in translation for the vertical, longitudinal, and lateral axes, respectively. The geometrical errors at 50 mm off-isocenter for kV X-ray images and CBCT were within 0.2 mm and 1.0 mm, respectively. The image fusion errors were within 1.0 mm in translation and 1.0 degrees in rotation, respectively. No significant difference in the image fusion accuracy was observed between the chest and pelvis phantoms. The isocenter alignment among the coordinate systems was performed with high accuracy. Furthermore, the automatic image fusion function achieved sufficient patient positioning accuracy and precision for image-guided radiotherapy. To evaluate the accuracy of the patient-positioning function of a newly developed image-guided radiotherapy system, the MHI-TM2000 (Mitsubishi Heavy Industries, Ltd., Japan).PURPOSETo evaluate the accuracy of the patient-positioning function of a newly developed image-guided radiotherapy system, the MHI-TM2000 (Mitsubishi Heavy Industries, Ltd., Japan).The isocenter positions prescribed by the lasers, MV treatment beam, and image guidance systems (kV X-ray image and kV-CBCT) were calculated using a cube phantom with a 10-mm-diameter steel ball fixed to the center of the phantom. Then, their location discrepancies were estimated. In addition, to verify the scale and orientation of the coordinate axes of the kV X-ray imaging system, positional measurements were repeated with the phantom placed at 50 mm off-isocenter along the vertical, longitudinal, and lateral directions, respectively. Further, image fusions of an anthropomorphic phantom image and the corresponding image translated by a pre-determined amount were performed.METHODSThe isocenter positions prescribed by the lasers, MV treatment beam, and image guidance systems (kV X-ray image and kV-CBCT) were calculated using a cube phantom with a 10-mm-diameter steel ball fixed to the center of the phantom. Then, their location discrepancies were estimated. In addition, to verify the scale and orientation of the coordinate axes of the kV X-ray imaging system, positional measurements were repeated with the phantom placed at 50 mm off-isocenter along the vertical, longitudinal, and lateral directions, respectively. Further, image fusions of an anthropomorphic phantom image and the corresponding image translated by a pre-determined amount were performed.The isocenter alignment among the coordinate systems was coincident within 0.5 mm in translation for the vertical, longitudinal, and lateral axes, respectively. The geometrical errors at 50 mm off-isocenter for kV X-ray images and CBCT were within 0.2 mm and 1.0 mm, respectively. The image fusion errors were within 1.0 mm in translation and 1.0 degrees in rotation, respectively. No significant difference in the image fusion accuracy was observed between the chest and pelvis phantoms.RESULTSThe isocenter alignment among the coordinate systems was coincident within 0.5 mm in translation for the vertical, longitudinal, and lateral axes, respectively. The geometrical errors at 50 mm off-isocenter for kV X-ray images and CBCT were within 0.2 mm and 1.0 mm, respectively. The image fusion errors were within 1.0 mm in translation and 1.0 degrees in rotation, respectively. No significant difference in the image fusion accuracy was observed between the chest and pelvis phantoms.The isocenter alignment among the coordinate systems was performed with high accuracy. Furthermore, the automatic image fusion function achieved sufficient patient positioning accuracy and precision for image-guided radiotherapy.CONCLUSIONSThe isocenter alignment among the coordinate systems was performed with high accuracy. Furthermore, the automatic image fusion function achieved sufficient patient positioning accuracy and precision for image-guided radiotherapy.
Author	Hiraoka, Masahiro Mizowaki, Takashi Kaneko, Shuji Kokubo, Masaki Takayama, Kenji Sawada, Akira Miyabe, Yuki
Author_xml	– sequence: 1 givenname: Yuki surname: Miyabe fullname: Miyabe, Yuki organization: Department of Radiation Oncology and Image-Applied Therapy, Kyoto University Graduate School of Medicine, Kyoto 6068507, Japan – sequence: 2 givenname: Akira surname: Sawada fullname: Sawada, Akira email: asawada@kuhp.kyoto-u.ac.jp organization: Department of Radiation Oncology and Image-Applied Therapy, Kyoto University Graduate School of Medicine, Kyoto 6068507, Japan – sequence: 3 givenname: Kenji surname: Takayama fullname: Takayama, Kenji organization: Department of Radiation Oncology and Image-Applied Therapy, Kyoto University Graduate School of Medicine, Kyoto 6068507, Japan – sequence: 4 givenname: Shuji surname: Kaneko fullname: Kaneko, Shuji organization: Medical Systems Engineering Section Advanced Systems Department Industrial Machinery Business, Technology & Solutions Division Mitsubishi Heavy Industries, LTD., Hiroshima 733-8553, Japan – sequence: 5 givenname: Takashi surname: Mizowaki fullname: Mizowaki, Takashi organization: Department of Radiation Oncology and Image-Applied Therapy, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan – sequence: 6 givenname: Masaki surname: Kokubo fullname: Kokubo, Masaki organization: Division of Radiation Oncology Institute of Biomedical Research and Innovation, Kobe 650-0047, Japan – sequence: 7 givenname: Masahiro surname: Hiraoka fullname: Hiraoka, Masahiro organization: Department of Radiation Oncology and Image-Applied Therapy, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
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Cites_doi	10.1016/j.radonc.2009.07.011 10.1118/1.1626122 10.1118/1.3005482 10.1016/j.radonc.2005.03.026 10.1016/j.ijrobp.2006.04.044 10.3171/FOC-07/12/E5 10.1016/j.ijrobp.2005.07.973 10.1016/0360-3016(88)90446-4 10.1007/s00066-007-1695-0 10.1016/j.ijrobp.2004.08.016 10.1120/jacmp.v8i3.2354 10.1016/j.meddos.2005.12.009 10.1016/S0167-8140(02)00385-7 10.1118/1.2723878 10.1016/j.meddos.2008.02.005 10.1016/j.ijrobp.2006.11.010 10.1016/j.radonc.2007.10.014 10.1120/jacmp.2023.25323 10.1118/1.2392605 10.1016/j.ijrobp.2008.08.059
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Keywords	Cone-beam CT Image-guided radiotherapy (IGRT) Positioning accuracy image fusion kV X-ray image
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Notes	Telephone: +81‐75‐751‐4215; Fax: +81‐75‐771‐9749. Department of Radiation Oncology and Image‐applied Therapy, Kyoto University Graduate School of Medicine, 54 Shogoin‐Kawaharacho, Sakyo, Kyoto 606‐8507, Japan. Electronic mail asawada@kuhp.kyoto‐u.ac.jp ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
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Snippet	Purpose: To evaluate the accuracy of the patient-positioning function of a newly developed image-guided radiotherapy system, the MHI-TM2000 (Mitsubishi Heavy... Purpose: To evaluate the accuracy of the patient‐positioning function of a newly developed image‐guided radiotherapy system, the MHI‐TM2000 (Mitsubishi Heavy... To evaluate the accuracy of the patient-positioning function of a newly developed image-guided radiotherapy system, the MHI-TM2000 (Mitsubishi Heavy...
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SubjectTerms	Cameras Computed radiography Computed tomography Computer-Aided Design computerised tomography Cone beam computed tomography Cone-beam CT diagnostic radiography Equipment Design Equipment Failure Analysis - methods image fusion Image guided radiation therapy image reconstruction Image sensors Image-guided radiotherapy (IGRT) Infrared detectors kV X-ray image medical image processing Medical imaging Medical X‐ray imaging phantoms position measurement Positioning accuracy radiation therapy Radiotherapy, Computer-Assisted - instrumentation Radiotherapy, Conformal - methods Reconstruction Robotics Therapeutic applications, including brachytherapy Tomography, X-Ray Computed - instrumentation X‐ray imaging
Title	Positioning accuracy of a new image-guided radiotherapy system
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