Verification of Skin Dose in Tomotherapy Using the Developed Phantom for Image Based Radiation Treatment System.
- Author:
Ji Yeon PARK
1
;
Jina CHANG
;
Seungjong OH
;
Dae Gyu KANG
;
Won Gyun JUNG
;
Jeong Woo LEE
;
Hong Suk JANG
;
Hoi Nam KIM
;
Hae Jin PARK
;
Sung Hwan KIM
;
Tae Suk SUH
Author Information
1. Department of Biomedical Engineering, The Catholic University of Korea, Seoul, Korea. suhsanta@catholic.ac.kr AD - Research Institute of Biomedical Encinering, The Catholic University of Korea, Seoul, Korea.
- Publication Type:Original Article
- Keywords:
Skin dose;
Helical tomotherapy;
QA phantom;
GafChromic EBT film;
Thermoluminescent dosimeter (TLD)
- MeSH:
Electrons;
Polytetrafluoroethylene;
Radiotherapy, Intensity-Modulated;
Skin;
Skin Neoplasms
- From:Korean Journal of Medical Physics
2009;20(2):88-96
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
Radiation treatment for skin cancer has recently increased in tomotherapy. It was reported that required dose could be delivered with homogeneous dose distribution to the target without field matching using electron and photon beam. Therapeutic beam of tomotherapy, however, has several different physical characteristic and irradiation of helical beam is involved in the mechanically dynamic factors. Thus verification of skin dose is requisite using independent tools with additional verification method. Modified phantom for dose measurement was developed and skin dose verification was performed using inserted thermoluminescent dosimeters (TLDs) and GafChromic EBT films. As the homogeneous dose was delivered to the region including surface and 6 mm depth, measured dose using films showed about average 2% lower dose than calculated one in treatment planning system. Region indicating about 14% higher and lower absorbed dose was verified on measured dose distribution. Uniformity of dose distribution on films decreased as compared with that of calculated results. Dose variation affected by inhomogeneous material, Teflon, little showed. In regard to the measured dose and its distribution in tomotherapy, verification of skin dose through measurement is required before the radiation treatment for the target located at the curved surface or superficial depth.
