SU‐E‐T‐301: Dosimetric Comparison Between Adaptive and Rectilinear Template‐Based Prostate Seed Implants

Purpose: To compare the dosimetry of a standard rectilinear and an adaptive technique used in I125 prostate seed implants. Methods: To achieve favorable dosimetry in prostate implants we used adaptive needle updates to match actual positions in real‐time. The seed locations were optimized based on a...

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Bibliographic Details
Published in:Medical physics (Lancaster) 2015-06, Vol.42 (6Part16), p.3402-3402
Main Authors: Sugar, E Neubauer, Buzurovic, I, O'Farrell, D, Hansen, J, Devlin, P, Cormack, R, Nguyen, P
Format: Article
Language:English
Subjects:
60 APPLIED LIFE SCIENCES
Anatomy
BRACHYTHERAPY
DOSIMETRY
HEALTH HAZARDS
IODINE 125
PATIENTS
PLANNING
PROSTATE
RADIATION DOSES
RADIATION PROTECTION AND DOSIMETRY
RADIATION SOURCE IMPLANTS
RECTUM
Robotics
URINARY TRACT
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Summary:Purpose: To compare the dosimetry of a standard rectilinear and an adaptive technique used in I125 prostate seed implants. Methods: To achieve favorable dosimetry in prostate implants we used adaptive needle updates to match actual positions in real‐time. The seed locations were optimized based on actual needle locations. The seeds were delivered automatically with a robotic device seedSelectron™ (Elekta Brachytherapy). In this study, we evaluated the former approach against the standard rectilinear technique in which the needles have a parallel distribution. The treatment plans for 10 patients were analyzed. For comparison, the actual treatment plans were revised so each needle was repositioned to its original parallel location through the template. The analysis was performed by comparing the target coverage and dose to the organs at risk. The comparison was done using the following planning goals: the target D90> 90%, V100% > 90%, V50%
ISSN:0094-2405
2473-4209
DOI:10.1118/1.4924662