Clinical commissioning of an in vivo range verification system for prostate cancer treatment with anterior and anterior oblique proton beams
| Autor: | G Jassens, El Hassane Bentefour, Hsiao-Ming Lu, Michaela A.U. Hoesl, Yang Kyun Park, Katia Parodi, S. Deepak, J Orban, Maryam Moteabbed |
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| Rok vydání: | 2016 |
| Předmět: |
Male
Accuracy and precision 030218 nuclear medicine & medical imaging Pelvis 03 medical and health sciences Prostate cancer 0302 clinical medicine medicine Proton Therapy Dosimetry Humans Radiology Nuclear Medicine and imaging Radiation treatment planning Radiometry Proton therapy Radiological and Ultrasound Technology business.industry Phantoms Imaging Radiotherapy Planning Computer-Assisted Oblique case Prostatic Neoplasms Water Radiotherapy Dosage medicine.disease Mockup 030220 oncology & carcinogenesis Nuclear medicine business Beam (structure) |
| Zdroj: | Physics in medicine and biology. 61(8) |
| ISSN: | 1361-6560 |
| Popis: | The purpose of this work is the clinical commissioning of a recently developed in vivo range verification system (IRVS) for treatment of prostate cancer by anterior and anterior oblique proton beams. The IRVS is designed to perform a complete workflow for pre-treatment range verification and adjustment. It contains specifically designed dosimetry and electronic hardware and a specific software for workflow control with database connection to the treatment and imaging systems. An essential part of the IRVS system is an array of Si-diode detectors, designed to be mounted to the endorectal water balloon routinely used for prostate immobilization. The diodes can measure dose rate as function of time from which the water equivalent path length (WEPL) and the dose received are extracted. The former is used for pre-treatment beam range verification and correction, if necessary, while the latter is to monitor the dose delivered to patient rectum during the treatment and serves as an additional verification. The entire IRVS workflow was tested for anterior and 30 degree inclined proton beam in both solid water and anthropomorphic pelvic phantoms, with the measured WEPL and rectal doses compared to the treatment plan. Gafchromic films were also used for measurement of the rectal dose and compared to IRVS results. The WEPL measurement accuracy was in the order of 1 mm and after beam range correction, the dose received by the rectal wall were 1.6% and 0.4% from treatment planning, respectively, for the anterior and anterior oblique field. We believe the implementation of IRVS would make the treatment of prostate with anterior proton beams more accurate and reliable. |
| Databáze: | OpenAIRE |
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