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- W2082813529 abstract "The relative dose rate for the different Gamma Knife ® helmets (4, 8, 14, and ) is characterized by their respective helmet factors. Since the plateau of the dose profile for the helmet is at most wide, detector choices are limited. Traditionally helmet factors have been measured using thermoluminescent dosimeters (TLDs). However, these are time‐consuming, cumbersome measurements. This article investigates the use of metal‐oxide‐semiconductor field effect transistors (MOSFETs) (active area of ) as a more accurate and convenient dosimeter. Their suitability for these measurements was confirmed by basic characterization measurements. Helmet factors were measured using both MOSFETs and the established TLD approach. A custom MOSFET cassette was designed in analogy to the Elekta TLD cassette (Elekta Instruments AB) for use with the Elekta dosimetry sphere. Although both dosimeters provided values within 3% of the manufacturer's suggestion, MOSFETs provided superior accuracy and precision, in a fraction of the time required for the TLD measurements. Thus, MOSFETs proved to be a reasonable alternative to TLDs for performing helmet factor measurements." @default.
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- W2082813529 date "2007-02-22" @default.
- W2082813529 modified "2023-10-16" @default.
- W2082813529 title "Measurement of Gamma Knife<sup>®</sup>helmet factors using MOSFETs" @default.
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- W2082813529 doi "https://doi.org/10.1118/1.2437282" @default.
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