Dose Verification for Intensity Modulated Radiotherapy of Prostate Cancer

• Main Authors: Meng-Tsung LIN, 林孟聰
• Other Authors: 王愛義
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/892c6j

碩士 === 元培科學技術學院 === 影像醫學研究所 === 95 === Abstract The dosimetry verification of intensity modulated radiotherapy (IMRT) dosimetry is a laborious task. The goal of this work is to evaluate the dosimetric characteristics of a new two-dimensional diode array and assess the role it can play in routine IMRT dosimetry verification. Hybridize the patient plan to a solid water phantom using the "create verification plan" in the Eclipse treatment planning system and re-calculate the dose distribution in the phantom. Typically, the dosimetry verification process consists of verifying the absolute dose delivered to a reference point, and also the relative planar isodose distribution. Measurements of relative beam dosimetry were made with the diode array and compared with those made with film and ion chamber. The diode array response is linear with dose up to 400 cGy. Clinical performance of the MapCheck for relative and absolute dosimetry is demonstrated with prostate IMRT plans, and compares well with film and ion chamber measurements. The MapCheck offers the dosimetric characteristics required for performing both relative and absolute dose measurements. Its use in the clinic can simplify and reduce the IMRT dosimetry verification workload.