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Average glandular dose in routine mammography screening using a Sectra MicroDose Mammography unit.

Hemdal, Bengt LU ; Herrnsdorf, Lars; Andersson, Ingvar LU ; Bengtsson, Gert; Heddson, Boel and Olsson, Magnus (2005) Second Malmo Conference on Medical X-Ray Imaging In Radiation Protection Dosimetry 114(1-3). p.436-443
Abstract
The Sectra MicroDose Mammography system is based on direct photon counting (with a solid-state detector), and a substantially lower dose to the breast than when using conventional systems can be expected. In this work absorbed dose measurements have been performed for the first unit used in routine mammography screening (at the Hospital of Helsingborg, Sweden). Two European protocols on dosimetry in mammography have been followed. Measurement of half value layer (HVL) cannot be performed as prescribed, but this study has demonstrated that non-invasive measurements of HVL can be performed accurately with a sensitive and well collimated solid-state detector with simultaneous correction for the energy dependence. The average glandular dose... (More)
The Sectra MicroDose Mammography system is based on direct photon counting (with a solid-state detector), and a substantially lower dose to the breast than when using conventional systems can be expected. In this work absorbed dose measurements have been performed for the first unit used in routine mammography screening (at the Hospital of Helsingborg, Sweden). Two European protocols on dosimetry in mammography have been followed. Measurement of half value layer (HVL) cannot be performed as prescribed, but this study has demonstrated that non-invasive measurements of HVL can be performed accurately with a sensitive and well collimated solid-state detector with simultaneous correction for the energy dependence. The average glandular dose for a 50 mm standard breast with 50% glandularity, simulated by 45 mm polymethylmethacrylate, was found to be 0.21 and 0.28 mGy in March and December 2004, respectively. These values are much lower than for any other mammography system on the market today. It has to be stressed that the measurements were made using the current clinical settings and that no systematic optimisation of the relationship between absorbed dose and diagnostic image quality has been performed within the present study. In order to further increase the accuracy of absorbed dose measurements for this unit, the existing dose protocols should be revised to account also for the tungsten/aluminium anode/filter combination, the multi-slit pre-collimator device and the occurrence of a dose profile in the scanning direction (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
European protocol, mammography screening, solid-state detector, half value layer, dosimetry, noninvasive measurement, polymethylmethacrylate, 45 mm, 50 mm, dose profile, diagnostic image quality, multislit pre-collimator device, direct photon counting, glandular dose, Sectra Microdose Mammography unit
in
Radiation Protection Dosimetry
volume
114
issue
1-3
pages
436 - 443
publisher
Nuclear Technology Publishing
conference name
Second Malmo Conference on Medical X-Ray Imaging
external identifiers
  • WOS:000229927400079
  • PMID:15933152
  • Scopus:21244505448
ISSN
1742-3406
DOI
10.1093/rpd/nch556
language
English
LU publication?
yes
id
7a749774-6dda-49d1-886d-6c4d6b3c3a09 (old id 615861)
date added to LUP
2007-07-12 11:43:37
date last changed
2017-02-19 04:38:53
@article{7a749774-6dda-49d1-886d-6c4d6b3c3a09,
  abstract     = {The Sectra MicroDose Mammography system is based on direct photon counting (with a solid-state detector), and a substantially lower dose to the breast than when using conventional systems can be expected. In this work absorbed dose measurements have been performed for the first unit used in routine mammography screening (at the Hospital of Helsingborg, Sweden). Two European protocols on dosimetry in mammography have been followed. Measurement of half value layer (HVL) cannot be performed as prescribed, but this study has demonstrated that non-invasive measurements of HVL can be performed accurately with a sensitive and well collimated solid-state detector with simultaneous correction for the energy dependence. The average glandular dose for a 50 mm standard breast with 50% glandularity, simulated by 45 mm polymethylmethacrylate, was found to be 0.21 and 0.28 mGy in March and December 2004, respectively. These values are much lower than for any other mammography system on the market today. It has to be stressed that the measurements were made using the current clinical settings and that no systematic optimisation of the relationship between absorbed dose and diagnostic image quality has been performed within the present study. In order to further increase the accuracy of absorbed dose measurements for this unit, the existing dose protocols should be revised to account also for the tungsten/aluminium anode/filter combination, the multi-slit pre-collimator device and the occurrence of a dose profile in the scanning direction},
  author       = {Hemdal, Bengt and Herrnsdorf, Lars and Andersson, Ingvar and Bengtsson, Gert and Heddson, Boel and Olsson, Magnus},
  issn         = {1742-3406},
  keyword      = {European protocol,mammography screening,solid-state detector,half value layer,dosimetry,noninvasive measurement,polymethylmethacrylate,45 mm,50 mm,dose profile,diagnostic image quality,multislit pre-collimator device,direct photon counting,glandular dose,Sectra Microdose Mammography unit},
  language     = {eng},
  number       = {1-3},
  pages        = {436--443},
  publisher    = {Nuclear Technology Publishing},
  series       = {Radiation Protection Dosimetry},
  title        = {Average glandular dose in routine mammography screening using a Sectra MicroDose Mammography unit.},
  url          = {http://dx.doi.org/10.1093/rpd/nch556},
  volume       = {114},
  year         = {2005},
}