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Three-dimensional, Real-time Treatment Verification with Simultaneous, Orthogonal kV-MV Imaging by E. Tryggestad; E. Ford; T. McNutt; R. Susil; J. Wong is a Medicine article available to read on EtoBox.

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characterized by a Gaussian prior probability with a banded covariance matrix representing a low-pass filter. An iterated conditional mode (ICM)-like approach is utilized to minimize the objective function. The corrected CBCT image can be obtained by subtracting the bias field from original CBCT image. The performance of correcting the cupping effect of CBCT image with the proposed MAP framework was tested using both contrast phantoms and clinical CBCT images. In the cylindrical shape-contrast phantom the higher density material is surrounded by the lower density material. Results: In the contrast phantom study, the intensities of higher density material in both KV and MV CBCT images are even lower than that of lower density material due to the cupping effect. The corrected CBCT images showed almost same intensity distribution as the original contrast phantom images. In a real patient study, it is clearly shown that there is a shadow inside the brain soft tissue in the original brain KV and MV CBCT images. The corrected CBCT images significantly improved the uniformity of intensity distribution of brain soft tissue. Conclusions: The proposed image-based scatter correction method sh

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Author

E. Tryggestad; E. Ford; T. McNutt; R. Susil; J. Wong

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0360-3016)

Published

2008

Language

EN

Field

Medicine (Health Sciences)