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An Active Matrix Flat Panel Dosimeter (AMFPD) for in‐phantom dosimetric measurements
Author(s) -
Moran Jean M.,
Roberts Donald A.,
Nurushev Teamour S.,
Antonuk Larry E.,
ElMohri Youcef,
Fraass Benedick A.
Publication year - 2005
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1855012
Subject(s) - dosimeter , dosimetry , imaging phantom , quality assurance , ionization chamber , dose profile , calibration , materials science , optics , active matrix , dynamic range , medical physics , nuclear medicine , physics , ion , medicine , quantum mechanics , layer (electronics) , composite material , external quality assessment , pathology , ionization , thin film transistor
An a ‐Si Active Matrix Flat Panel Imager (AMFPI) prototype developed in‐house has been modified to function as an in‐phantom dosimetry system providing high resolution two‐dimensional (2‐D) data. This Active Matrix Flat Panel Dosimeter (AMFPD) system can be used as a replacement device for standard in‐phantom dosimeters, such as scanning ion chambers in water, or film in solid water. The initial characterization of the device demonstrates a wide dynamic range (up to 160 cGy), a stable calibration curve (less than 1.5% variation over 1 year), dose rate independence (less than 1%), and excellent agreement of output factors with ion chamber measurements for a range of field sizes (less than 2%). The device also compares well to film for 2‐D planar dose distributions. It is expected that the AMFPD system will be useful for beam commissioning, algorithm verification test data, and routine IMRT quality assurance dosimetry.