Property of Dose Distribution in Accordance with Dose Rate Variation in Intensity Modulated Radiation Therapy.
- Author:
Min Kyu KANG
1
;
Sung Joon KIM
;
Hyun Soo SHIN
;
Sung Kyu KIM
Author Information
1. Department of Therapeutic Radiology & Oncology, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
- Publication Type:Original Article
- Keywords:
IMRT;
Dose rate;
Dose distribution
- MeSH:
Humans;
Particle Accelerators;
Posture
- From:Korean Journal of Medical Physics
2010;21(2):218-222
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
As radiation is irradiated from various directions in intensity modulated radiation therapy (IMRT), longer treatment time than conventional treatment method is taken. In case of the patients who have problem to keep same posture for long time because of pain and injury, reducing treatment time through increased dose rate is a way for effective treatment. This study measured and found out the variation of dose and dose distribution in accordance with dose rate variation. IMRT treatment plan was set up to investigate from 5 directions - 0degrees, 72degrees, 144degrees, 216degrees, 288degrees - using ECLIPSE system (Varian, SomaVision 6.5, USA). To confirm dose and dose rate in accordance with dose rate variation, dose rate was set up as 100, 300, 500 MU/min, and dose and dose distribution were measured using ionization chamber (PTW, TN31014) and film dosimeter (EDR2, Kodak). At this time, film dosimeter was inserted into acrylic phantom, then installed to run parallel with beam's irradiating direction, 21EX-S (Varian, USA) was utilized as linear accelerator for irradiation. The measured film dosimeter was analyzed using VXR-16 (Vidar System Corporation) to confirm dose distribution.
