In:
Medical Physics, Wiley, Vol. 28, No. 11 ( 2001-11), p. 2370-2378
Abstract:
The purpose of this study was to find a physical‐mathematical description capable to correct a polymer‐gel dosimeter relaxation rate ‐dose response for different temperatures. Four different modifications of polymer‐gel dosimeters were used in this study. Samples with polymer‐gel dosimeter in glass test vessels were homogeneously irradiated by gamma photons. A multi‐echo sequence with 16 equidistant echoes was used for evaluation of irradiated polymer‐gel dosimeters. The sequence parameters were as follows: TR 2000 ms, TE 22.5–360.0 ms, slice thickness 5 mm, FOV 255 mm, one acquisition. The proposed description recommends to subtract response of the nonirradiated dosimeter from the total ‐dose response. The relaxation rate for the irradiated dosimeter can be expressed as a function of temperature and dose. The temperature dependence has an exponential behavior in the measured range. The proposed description allows to correct the measured NMR ‐dose responses for different temperatures.
Type of Medium:
Online Resource
ISSN:
0094-2405
,
2473-4209
Language:
English
Publisher:
Wiley
Publication Date:
2001
detail.hit.zdb_id:
1466421-5
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