Title
Calculations of displacement corrections for in-phantom measurements with ionisation chambers for mammography
Author
Zoetelief, J.
Eisenhauer, C.M.
Coyne, J.J.
Publication year
1990
Abstract
Displacement corrections for in-phantom measurements with ionisation cham- bers for the purpose of mammography are large and represent a major correction to consider for dose determinations. Experimental data on displacement corrections depend to a large degree on the model used to extrapolate to zero cavity radius. Calculations of displacement correction factors using a Monte Carlo code are presented for different cavity shapes, i.e. spherical, cylindrical and disc-like, in various phantom materials simulating the average breast and breast composing tissues. In addition, the influence of wall material and depth in-phantom are studied. Exponential extrapolation to zero cavity radius should be performed to obtain the dose in homogeneous phantoms. Displacement corrections for photons as used in mam- mography seem compatible with geometrical considerations made previously. A dis- crepancy is found between depth-dose data derived from calculations and those found in experiments.
Subject
article
dosimetry
ionization chamber
mammography
methodology
priority journal
Female
Human
Mammography
Models, Structural
Radiation Dosage
Radiometry
Support, Non-U.S. Gov't
To reference this document use:
http://resolver.tudelft.nl/uuid:9877f718-a51f-43a6-9090-cbac45132767
DOI
https://doi.org/10.1088/0031-9155/35/9/008
TNO identifier
231288
ISSN
0031-9155
Source
Physics in Medicine and Biology, 35 (35), 1287-1300
Document type
article