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Positioning accuracy of a new image-guided radiotherapy system
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10.1118/1.3578607
    + View Affiliations - Hide Affiliations
    Affiliations:
    1 Department of Radiation Oncology and Image-Applied Therapy, Kyoto University Graduate School of Medicine, Kyoto 6068507, Japan
    2 Medical Systems Engineering Section Advanced Systems Department Industrial Machinery Business, Technology & Solutions Division Mitsubishi Heavy Industries, LTD., Hiroshima 733-8553, Japan
    3 Department of Radiation Oncology and Image-Applied Therapy, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
    4 Division of Radiation Oncology Institute of Biomedical Research and Innovation, Kobe 650-0047, Japan
    5 Department of Radiation Oncology and Image-Applied Therapy, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan
    a) 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; Telephone: +81-75-751-4215; Fax: +81-75-771-9749.
    Med. Phys. 38, 2535 (2011); http://dx.doi.org/10.1118/1.3578607
/content/aapm/journal/medphys/38/5/10.1118/1.3578607
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/5/10.1118/1.3578607

Figures

Image of FIG. 1.
FIG. 1.

The MHI-TM2000 system configuration and its coordinate system. The positive x-axis direction is defined as being from left to right when facing the O-ring gantry. The positive y-axis direction is defined as being toward the O-ring gantry and the positive z-axis direction is defined as being from the floor toward the ceiling. The positive angles are expressed as clockwise rotation.

Image of FIG. 2.
FIG. 2.

The cube phantom with a steel ball and acquired images of the phantom: (a) photograph of the cube phantom, (b) MV X-ray image acquired by EPID with a square field (30 × 30 mm), (c) kV X-ray image, and (d) kV-CBCT image.

Image of FIG. 3.
FIG. 3.

The appearance of phantom set-up. The IR markers were attached to the anterior surface of the phantom. (a) The rotational and translational changes in phantom position were monitored by IR camera system. (b) The phantom was positioned to the isocenter by alignment of the lasers with the marks on the phantom.

Image of FIG. 4.
FIG. 4.

Isocenter accuracy of the MV treatment beam with gantry and ring rotation. The displacement of the center of the steel ball positioned at laser isocenter from the center of the radiation field was determined from the 2D portal images.

Image of FIG. 5.
FIG. 5.

The isocenter alignment in the kV X-ray imaging subsystem with gantry and ring rotation. The displacement between the 3D coordinates of the isocenters of MV beam and kV imaging system was calculated.

Tables

Generic image for table
TABLE I.

The geometrical error of the isocenter in the kV-CBCT for each FPD and imaging direction.

Generic image for table
TABLE II.

The geometrical accuracy of the coordinate axes of the kV X-ray and CBCT images.

Generic image for table
TABLE III.

Target localization accuracy using the ExacTrac image-fusion software.

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/content/aapm/journal/medphys/38/5/10.1118/1.3578607
2011-05-02
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Positioning accuracy of a new image-guided radiotherapy system
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/5/10.1118/1.3578607
10.1118/1.3578607
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