Title :
Characterization of Fricke-gel layers for absolute dose measurements in radiotherapy
Author :
Gambarini, G. ; Carrara, M. ; Rrushi, B. ; Guilizzoni, R. ; Borroni, M. ; Tomatis, S. ; Pirola, L. ; Battistoni, G.
Author_Institution :
Dept. of Phys., Univ. degli Studi of Milan, Milan, Italy
Abstract :
Fricke-gel layer dosimeters (FGLDs) have shown promising features for attaining absolute measurements of the spatial distribution of the absorbed dose in radiotherapy. Good precision of results (within 3%) is achieved by means of calibration of each single dosimeter before measurement. The calibration is performed irradiating the dosimeter at a uniform and precisely known dose, in order to get a calibration matrix that must be used, with pixel-to-pixel manipulation, to obtain the dose image. A study of the trend in time of dosimeter response after one or more exposures was carried out and calibration protocols were suitably established and verified.
Keywords :
calibration; dosimeters; dosimetry; radiation therapy; absorbed dose spatial distribution; calibration matrix; calibration protocols; dose image; dose measurements; dosimeter response time; fricke-gel layer dosimeters; modern radiotherapy; pixel-to-pixel manipulation; single dosimeter calibration; Calibration; Dosimetry; Optical filters; Phantoms; Protocols; Radiation effects; Software;
Conference_Titel :
Advancements in Nuclear Instrumentation Measurement Methods and their Applications (ANIMMA), 2011 2nd International Conference on
Conference_Location :
Ghent
Print_ISBN :
978-1-4577-0925-8
DOI :
10.1109/ANIMMA.2011.6172969
