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Dose distribution from a Delta‐25 head scanner
Author(s) -
Agarwal S. K.,
Friesen E. J.,
Bhaduri D.,
Courlas G.
Publication year - 1979
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 - 10.1118/1.594632
Subject(s) - imaging phantom , scanner , dosimetry , nuclear medicine , thermoluminescent dosimeter , materials science , optics , head (geology) , percentage depth dose curve , dose profile , physics , ionization chamber , dosimeter , medicine , ion , quantum mechanics , geomorphology , geology , ionization
The dose distribution pattern from a Delta‐25 head scanner was evaluated experimentally in a 17.5‐cm‐diam cylinder water phantom for different scan speed and slice thickness combinations. TLD chips were used to measure the dose at different points across the scan section. The isodose curves thus obtained were found to be asymmetric, with the regions of maximum and minimum dose near the surface on the opposite sides of the phantom. The effect of changing the scan thickness and speed on dose was evaluated and a linear increase in dose with the increase of slice thickness was observed. This was consistent with the design of the line focus and the beam collimators used in this system. The effect of multiple slice scan on the dose was also evaluated.