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Title: SU-E-T-560: Commissioning An HDR Freiburg Flap Applicator for Skin Lesion Treatment

Abstract

Purpose: Flexible Freiburg flap used with high dose rate afterloaders is easy to cut into any size for any body site and to dwell with a precise source position, conforms to curved skin surface and then to the planned target. However, unlike intracavity or interstitial situations, incomplete scatter environment due to flap applicators exposed to air might lead to dose difference between the delivered and planned. This research is focused on the dose deviation of incomplete scatter versus full scatter. Methods: A 12x12 cm of Freiburg flap applicator was used for the validation. A Nucletron Oncentra Brachy Ver. 4.3 treatment planning system (TPS) was used for treatment planning. However, no heterogeneity correction incorporated into the brachytherap TPS needs to be considered. A Philips Brilliance CT Big Bore was employed for CT scan. Radiation was delivered using a Nucletron HDR remote afterloader system. A 10cm bolus was used to cover the flap for obtaining a full scatter. An OSL, ion chamber, and Gafchromic EBT2 film were used for commissioning the flap applicator. Results: The applicator calibration at 5mm depth was performed using an OSL dosimeter. Applicator source dwelling positions with 1D and 2D array exposed to and recorded by Gafchromic EBT2more » film showed an agreement within 1mm. 1D array of Freiburg flap exhibited 4.2% cooler in dose with incomplete scatter than full scatter. 2D array showed 7.1% lower in dose for incomplete scatter than full scatter. The deviation was found more than 10% beyond 8cm in depth. Conclusion: Significant dose deviation caused by the incomplete scatter environment was found to be 7.1% at 1cm depth. This deviation was increased with increasing depth. The inaccuracy resulted from the incomplete scatter can be fixed by either placing a bolus on the top of the flap or making the plan at least 7% hotter.« less

Authors:
; ; ; ;  [1]; ;  [2]
  1. RadAmerica, LLC--MedStar Health, Baltimore, MD (United States)
  2. Mercy Medical Center, Baltimore, MD (United States)
Publication Date:
OSTI Identifier:
22369680
Resource Type:
Journal Article
Journal Name:
Medical Physics
Additional Journal Information:
Journal Volume: 41; Journal Issue: 6; Other Information: (c) 2014 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-2405
Country of Publication:
United States
Language:
English
Subject:
07 ISOTOPES AND RADIATION SOURCES; CALIBRATION; CAT SCANNING; DOSE RATES; DOSEMETERS; IONIZATION CHAMBERS; SKIN; VALIDATION

Citation Formats

Dou, K, Li, B, Lerma, F, Aroumougame, V, Sarfaraz, M, Laser, B, and Jacobs, M. SU-E-T-560: Commissioning An HDR Freiburg Flap Applicator for Skin Lesion Treatment. United States: N. p., 2014. Web. doi:10.1118/1.4888895.
Dou, K, Li, B, Lerma, F, Aroumougame, V, Sarfaraz, M, Laser, B, & Jacobs, M. SU-E-T-560: Commissioning An HDR Freiburg Flap Applicator for Skin Lesion Treatment. United States. https://doi.org/10.1118/1.4888895
Dou, K, Li, B, Lerma, F, Aroumougame, V, Sarfaraz, M, Laser, B, and Jacobs, M. 2014. "SU-E-T-560: Commissioning An HDR Freiburg Flap Applicator for Skin Lesion Treatment". United States. https://doi.org/10.1118/1.4888895.
@article{osti_22369680,
title = {SU-E-T-560: Commissioning An HDR Freiburg Flap Applicator for Skin Lesion Treatment},
author = {Dou, K and Li, B and Lerma, F and Aroumougame, V and Sarfaraz, M and Laser, B and Jacobs, M},
abstractNote = {Purpose: Flexible Freiburg flap used with high dose rate afterloaders is easy to cut into any size for any body site and to dwell with a precise source position, conforms to curved skin surface and then to the planned target. However, unlike intracavity or interstitial situations, incomplete scatter environment due to flap applicators exposed to air might lead to dose difference between the delivered and planned. This research is focused on the dose deviation of incomplete scatter versus full scatter. Methods: A 12x12 cm of Freiburg flap applicator was used for the validation. A Nucletron Oncentra Brachy Ver. 4.3 treatment planning system (TPS) was used for treatment planning. However, no heterogeneity correction incorporated into the brachytherap TPS needs to be considered. A Philips Brilliance CT Big Bore was employed for CT scan. Radiation was delivered using a Nucletron HDR remote afterloader system. A 10cm bolus was used to cover the flap for obtaining a full scatter. An OSL, ion chamber, and Gafchromic EBT2 film were used for commissioning the flap applicator. Results: The applicator calibration at 5mm depth was performed using an OSL dosimeter. Applicator source dwelling positions with 1D and 2D array exposed to and recorded by Gafchromic EBT2 film showed an agreement within 1mm. 1D array of Freiburg flap exhibited 4.2% cooler in dose with incomplete scatter than full scatter. 2D array showed 7.1% lower in dose for incomplete scatter than full scatter. The deviation was found more than 10% beyond 8cm in depth. Conclusion: Significant dose deviation caused by the incomplete scatter environment was found to be 7.1% at 1cm depth. This deviation was increased with increasing depth. The inaccuracy resulted from the incomplete scatter can be fixed by either placing a bolus on the top of the flap or making the plan at least 7% hotter.},
doi = {10.1118/1.4888895},
url = {https://www.osti.gov/biblio/22369680}, journal = {Medical Physics},
issn = {0094-2405},
number = 6,
volume = 41,
place = {United States},
year = {Sun Jun 01 00:00:00 EDT 2014},
month = {Sun Jun 01 00:00:00 EDT 2014}
}