The Role of Image-guided Radiotherapy in the Treatment of Anorectal Cancer Using Prone Belly-board Positioning

To evaluate Radiation Therapy Oncology Group planning target volume margins of 7-10 mm for radiation therapy in anorectal cancer using prone belly-board positioning without image guidance. 375 kV cone beam computed tomography image-guided radiotherapy (IGRT) images from 20 patients treated for anore...

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Published in:Anticancer research 2016-06, Vol.36 (6), p.3013-3017
Main Authors: Miyamoto, Jaclyn, Michaud, Anthony L, Harandi, Nima K, Kim, Edward J, Semrad, Thomas, Khatri, Vijay, Mayadev, Jyoti, Perks, Julian, Monjazeb, Arta M
Format: Article
Language:English
Subjects:
Adult
Aged
Aged, 80 and over
Body Mass Index
Cone-Beam Computed Tomography - methods
Female
Humans
Male
Middle Aged
Patient Positioning
Radiotherapy, Image-Guided - methods
Rectal Neoplasms - radiotherapy
Retrospective Studies
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container_end_page 3017
container_issue 6
container_start_page 3013
container_title Anticancer research
container_volume 36
creator Miyamoto, Jaclyn
Michaud, Anthony L
Harandi, Nima K
Kim, Edward J
Semrad, Thomas
Khatri, Vijay
Mayadev, Jyoti
Perks, Julian
Monjazeb, Arta M
description To evaluate Radiation Therapy Oncology Group planning target volume margins of 7-10 mm for radiation therapy in anorectal cancer using prone belly-board positioning without image guidance. 375 kV cone beam computed tomography image-guided radiotherapy (IGRT) images from 20 patients treated for anorectal cancer were retrospectively analyzed for setup shifts. We calculated the total translational shift for each patient and the frequency with which setup shifts exceeded 7 mm and 10 mm. A total of 42.7% of treatments required shifts >7 mm and 20.8% >10 mm. The mean translational shift was 7.1 mm. 70% of patients experienced shifts ≥7 mm in 20% or more of their treatments and 25% of ≥10 mm in 20% or more of their treatments; 15% experienced shifts ≥10 mm in over half of their treatments. van Herk calculations suggest margins of 12.8 mm are necessary for accuracy without IGRT. IGRT using a prone belly board and 7-10 mm margins requires daily image-guidance to prevent planning target volume misses and ensure optimal dose delivery.
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subjects Adult
Aged
Aged, 80 and over
Body Mass Index
Cone-Beam Computed Tomography - methods
Female
Humans
Male
Middle Aged
Patient Positioning
Radiotherapy, Image-Guided - methods
Rectal Neoplasms - radiotherapy
Retrospective Studies
title The Role of Image-guided Radiotherapy in the Treatment of Anorectal Cancer Using Prone Belly-board Positioning
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