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Original Article

Korean Journal of Medical Physics 2014; 25(4): 193-198

Published online December 30, 2014

Copyright © Korean Society of Medical Physics.

Qualitative Evaluation of 2D Dosimetry System for Helical Tomotherapy

Sun Young Ma*, Tae Sig Jeung*, Jang Bo Shim, Sangwook Lim*

*Department of Radiation Oncology, Kosin University College of Medicine, Busan, Department of Radiation Oncology, Guro Hospital, College of Medicine, Korea University, Seoul, Korea

Received: October 20, 2014; Revised: October 29, 2014; Accepted: November 24, 2014

Abstract

The purpose of this study is to see the feasibility of the newly developed 2D dosimetry system using phosphor screen for helical tomotherapy. The cylindrical water phantom was fabricated with phosphor screen to emit the visible light during irradiation. There are three types of virtual target, one is one spot target, another is C-shaped target, and the other is multiple targets. Each target was planned to be treated at 10 Gy by treatment planning system (TPS) of tomotherapy. The cylindrical phantom was placed on the tomotherapy table and irradiated as calculations of the TPS. Every frame which acquired by CCD camera was integrated and the doses were calculated in pixel by pixel. The dose distributions from the fluorescent images were compared with the calculated dose distribution from the TPS. The discrepancies were evaluated as gamma index for each treatment. The curve for dose rate versus pixel value was not saturated until 900 MU/min. The 2D dosimetry using the phosphor screen and the CCD camera is respected to be useful to verify the dose distribution of the tomotherapy if the linearity correction of the phosphor screen improved.

KeywordsTomotherapy, Phosphor screen, Dose distribution, Blur kernel, Gamma index

Korean Society of Medical Physics

Vol.35 No.2
June 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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