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Determination of appropriate conversion factors for calculating size-specific dose estimates based on X-ray CT scout images after miscentering correction

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/79366

Title: Determination of appropriate conversion factors for calculating size-specific dose estimates based on X-ray CT scout images after miscentering correction
Authors: Terashima, Marin Browse this author
Mizonobe, Kazufusa Browse this author
Date, Hiroyuki Browse this author →KAKEN DB
Keywords: Size-specific dose estimate
Computed tomography dose index
Miscentering correction
Issue Date: Sep-2019
Publisher: Springer
Journal Title: Radiological physics and technology
Volume: 12
Issue: 3
Start Page: 283
End Page: 289
Publisher DOI: 10.1007/s12194-019-00519-5
PMID: 31222561
Abstract: In this study, we proposed and evaluated the validity of an optimized size-specific dose estimate, a widely used index of radiation dose in X-ray computed tomography (CT) examinations. Based on miscentering correction of scout images, we determined the appropriate conversion factors (CF) by using a phantom. Scans were conducted using a multi-detector CT system (Aquilion ONE, Canon Medical Systems). Four cylindrical phantoms were taken in the anteroposterior (AP) and axial directions to determine the relationship between pixel value and water-equivalent length (L-w). In the AP scout image, the pixel values at the selected slice positions were converted to L-w to calculate the water-equivalent diameter (D-w). The CF was derived from D-w and CF values before and after miscentering correction was calculated. Finally, the CF values were compared to those calculated from the axial image using the conventional methodology of the American Association of Physicists in Medicine. Before miscentering correction, the maximum difference between the CF values of the axial and scout images was 7.26%. However, after miscentering correction, the maximum difference was 1.34%. Validation using a whole-body phantom generally revealed low maximum differences between the CF from the axial image and the values from the miscentering-corrected scout images. These were 2.41% in the chest, 6.30% in the upper abdomen, 1.43% in the abdomen, and 2.45% in the pelvic region. Consequently, we concluded that our miscentering correction method for deriving the appropriate CF values based on scout images is advantageous.
Rights: This is a post-peer-review, pre-copyedit version of an article published in Radiological Physics and Technology. The final authenticated version is available online at: http://dx.doi.org/10.1007/s12194-019-00519-5
Type: article (author version)
URI: http://hdl.handle.net/2115/79366
Appears in Collections:保健科学院・保健科学研究院 (Graduate School of Health Sciences / Faculty of Health Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 伊達 広行

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