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Distortion verification of helical computed tomography for image-guided radiotherapy

Published online by Cambridge University Press:  25 September 2023

Takayuki Harada Open the ORCID record for Takayuki Harada [Opens in a new window]  and
Akihiro Takemura
Takayuki Harada*
Affiliation:
Department of Radiology, National Hospital Organization Kanazawa Medical Center, 1-1 Shimoishibiki, Kanazawa, Ishikawa 920-8650, Japan Division of Health Science, Graduate School, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa 920-0942, Japan
Akihiro Takemura
Affiliation:
Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa 920-0942, Japan
*
Corresponding author: Takayuki Harada; Email: harada.takayuki.mf@mail.hosp.go.jp
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Abstract

Introduction:

In image-guided radiotherapy (IGRT), the imaging conditions of computed tomography (CT) may impact the positioning uncertainty, but verification methods are currently unavailable. This study aimed to propose a validation method for the imaging conditions of helical CT for IGRT. Predicting the impact of image distortion on image guidance may reduce uncertainty in radiotherapy planning.

Methods:

Image guidance was performed on the reference images of four Duracon balls by changing the imaging conditions and the positions on the CT images by helical scanning. The predictors of image guidance error and those of the contour mismatch between the reference and cone-beam CT (CBCT) images were analysed.

Results:

The image guidance error exceeded 1 mm when the contour centre of the ball was shifted by more than 1 mm. The mismatch between the contours of the reference and CBCT images occurred with the imaging conditions wherein the first slice of the ball was distorted.

Conclusions:

Mismatch can be predicted by the coefficient of variation of the radii in the first and centre slices of the ball. Moreover, the image guidance error can be predicted by the contour centre shift of the ball.

Keywords

Coefficient of variationdetector collimationimage distortionimage guided radiotherapypitch factor
Type
Original Article
Information
Journal of Radiotherapy in Practice , Volume 22 , 2023 , e76
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Copyright
© The Author(s), 2023. Published by Cambridge University Press

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