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AmJCaseRep

Consistency of Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) Detectors with Changing Field Sizes in Radiation Therapy

Huda I. Al-Mohammed

Med Sci Tech 2015; 56:145-148

DOI: 10.12659/MST.896797

Available online: 2015-12-09

Published: 2015-12-09


#896797

BACKGROUND: The efficiency of radiation therapy treatment requires an efficient dosimetry system that can measure the prescribed dose and deliver it to the desired treatment field. Mobile metal-oxide-semiconductor field-effect transistor (MOSFET) detectors have recently been introduced to radiation therapy. However, the response of these detectors to changing field sizes is known. Therefore, it is important to evaluate this issue to show how much variation occurs between the treatment’s prescribed dose and the dose that is actually delivered to the patient using high-energy photon or electron beams. The aim of this study was to investigate the effect of different field sizes on mobile MOSFET performance.
MATERIAL AND METHODS: The measurements were done by exposing mobile MOSFET detectors to different field sizes – 5×5 cm2, 5×8 cm2, 10×10 cm2, 8×12 cm2, and 15×15 cm2 – with an open field, no blocks, and multileaf collimator. This study was performed using the Varian Clinac 2300 EX linear accelerator with 6 MV and a dose of 300 cGy. Five reading were recorded for each field.
RESULTS: The result showed that no significant change in response was observed in using different field sizes, with no variation in the dose. Mobile MOSFET detectors have no field-size dependence.
CONCLUSIONS: The mobile MOSFET detectors had a uniform dose response with different field sizes, and showed precise and stable dosimetry.

Keywords: Dose-Response Relationship, Drug, Field Dependence-Independence, Radiotherapy, Image-Guided



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