Premium
Comparison of dose response of radiochromic film measured with He‐Ne laser, broadband, and filtered light densitometers
Author(s) -
Reinstein L. E.,
Gluckman G. R.
Publication year - 1997
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 - 10.1118/1.598043
Subject(s) - densitometer , optics , laser , materials science , radiation , nuclear medicine , medicine , physics
Dose response curves for GAFChromic MD‐55‐2 film were measured using three different densitometer systems: a He‐Ne laser densitometer, a broadband (white light) densitometer, and a filtered red light densitometer. These were found to differ significantly; the dose needed to achieve a net optical density of 1 (DNOD1) was greater than 100 Gy for the white light densitometer, 56 Gy for the He‐Ne densitometer, and only 14.8 Gy for the filtered red light densitometer. This represents approximately a fourfold increase in response for the filtered red light versus the He‐Ne laser densitometer, which is a significant improvement. For some patient prescriptions this enables us to achieve an accuracy and precision sufficient to verify daily dose to within 5%.