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- W2909390590 abstract "In this study, computer simulations and experiments were used to verify the accuracy of a two-dimensional image registration program (program) for portal images that we previously developed. The program used a computed radiography cassette system and digitally reconstructed radiography images as planning images for external beam radiation therapy. Using this program, we also investigated the reason two-dimensional automatic image registration images experienced large misregistration in clinical practice using commercial image registration systems. Mutual information and normalized mutual information were used as the registration criteria. To investigate the influence of image background with or without a region of interest (ROI), results of image registrations were compared. Parameters of image registration were defined as translation in the horizontal and vertical directions (x and y, respectively) and rotation (θ) around the axis perpendicular to the x-y plane. There was no significant difference in image registration arising from the difference between mutual information and normalized mutual information. Image registration was improved with a ROI. Regardless of the registration criteria, errors in image registration with a ROI in the experimental study were ≤1.2 mm in directions x and y and ≤1.0 degree in rotation θ. We found that image registration required setting up as close to the planned position as possible." @default.
- W2909390590 created "2019-01-25" @default.
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- W2909390590 date "2018-01-01" @default.
- W2909390590 modified "2023-09-27" @default.
- W2909390590 title "Evaluation of the Image Registration Program for Portal Images Using CR and DRR Images in Radiation Therapy" @default.
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- W2909390590 doi "https://doi.org/10.6009/jjrt.2018_jsrt_74.8.779" @default.
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