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ID 117228
Author
Sakuragawa, Kanako Tokushima University
Kamomae, Takeshi Nagoya University
Yokoishi, Michihiro Tokushima University
Kajino, Akimi Tokushima University
Keywords
brain metastasis
digitally reconstructed radiograph
ExacTrac
stereotactic radiosurgery
Content Type
Journal Article
Description
This study aimed to investigate the effect of two different image density adjustment parameters on the results of image matching at six degrees of freedom using radiographic images generated by the ExacTrac X-ray system in brain stereotactic radiosurgery (SRS). This study comprised 32 patients who underwent brain SRS at our hospital from January 2020 to December 2020. In this study, (1) the default parameter (an image density parameter between “tissue” and “bone”) was an image density parameter for digitally reconstructed radiograph (DRR) generation used at many facilities, and (2) the bone parameter was the steepest contrast parameter used at our hospital. Of the 32 patients, 24 (75%) had a couch angle of 0.5 mm or more in the translational direction or 0.5° or more in the rotational direction, and 10 (31%) had a couch angle of 1.0 mm or more in the translational direction or 1.0° or more in the rotational direction. Among the 131 cases of all couch angles, 46 (35%) cases had a translational direction of 0.5 mm or more or a rotational direction of 0.5° or more, and 15 (11%) had a translational direction of 1.0 mm or more or a rotational direction of 1.0° or more. The results of this study indicate the usefulness of using appropriate DRR parameters for each case, rather than using the default settings. The use of appropriate DRR parameters can lead to accurate position matching results, leading to fewer image-guided radiation therapy shots and a lower imaging dose.
Journal Title
Journal of Applied Clinical Medical Physics
ISSN
15269914
NCID
AA12034060
Publisher
Wiley Periodicals|American Association of Physicists in Medicine
Volume
23
Issue
2
Start Page
e13505
Published Date
2021-12-20
Rights
This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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DOI (Published Version)
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language
eng
TextVersion
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departments
Medical Sciences