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J Korean Soc Ther Radiol Oncol > Volume 22(1); 2004 > Article
The Journal of the Korean Society for Therapeutic Radiology and Oncology 2004;22(1): 64-68.
Feasibility Study of the Real-Time IMRT Dosimetry Using a Scintillation Screen
Sang Wook Lim, Byong Yong Yi, Young Eun Ko, Young Hoon Ji, Jong Hoon Kim, Seung Do Ahn, Sang Wook Lee, Seong Soo Shin, Soo Il Kwon, Eun Kyoung Choi
1Department of Radiation Oncology, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Korea. yiby@amc.seoul.kr
2Department of Radiation Oncology, Korea Institute of Radiological & Medical Sciences Medicine, Korea.
3Department of Medical Physics, Kyonggi University, Suwon, Korea.
To study the feasibility of verifying real-time 2-D dose distribution measurement system with the scintillation screen for the quality assurance.
The water phantom consisted of a scintillation screen (LANEX fast screen, Kodak, USA) that was axially located in the middle of an acrylic cylinder with a diameter of 25 cm. The charge-coupled device (CCD) camera was attached to the phantom in order to capture the visible light from the scintillation screen. To observe the dose distribution in real time, the intensity of the light from the scintillator was converted to a dosage. The isodose contours of the calculations from RTP and those of the measurements using the scintillation screen were compared for the arc therapy and the intensity modulated radiation therapy (IMRT).
The kernel, expressed as a multiplication of two error functions, was obtained in order to correct the sensitivity of the CCD of the camera and the scintillation screen. When comparing the calculated isodose and measured isodose, a discrepancy of less than 8 mm in the high dose region was observed.
Using the 2-D dosimetry system, the relationship between the light and the dosage could be found, and real-time verification of the dose distribution was feasible.
Key Words: IMRT (intensity modulated radiation therapy), QA (quality assurance), Scintillation screen, Real time dosimetry
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