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Generic Planning Target Margin for Rectal Cancer Treatment Setup Variation by John M. Robertson; Jonathon P. Campbell; Di Yan is a Medicine article available to read on EtoBox.

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## Purpose: To calculate the generic planning target margin (gptm) for patients receiving radiation therapy (rt) for rectal cancer placed in a prone position with a customized cradle for small-bowel exclusion. ## Methods and materials: A total of 25 consecutive rectal cancer patients were treated for 25 or 28 fractions in a prone position using a cradle to maximize small bowel exclusion. treatment planning computed tomography (ct) scans were used to create orthogonally digitally reconstructed radiographs (drrs) for portal image registration, which were compared with daily portal images from an electronic portal-imaging device (epid). translation values needed to align the drrs and epids were recorded for the superior to inferior (si), right to left (rl), and anterior to posterior (ap) directions, and used to calculate the gptm using the four-parameter model. age, weight, and body mass index were tested compared with the setup variation using a pearson correlation and a t test for significance. gender versus setup variation was compared with a t test. ## Results: A total of 1,723 epid images were reviewed. the gptm was 10 mm superior, 8 mm inferior, 7 mm rl and 10 mm ap. age and gen

Who reads Generic Planning Target Margin for Rectal Cancer Treatment Setup Variation?

Author

John M. Robertson; Jonathon P. Campbell; Di Yan

Publisher

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

Published

2009

Language

EN

Field

Medicine (Health Sciences)