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Threshold pixel size for shape determination of microcalcifications in digital mammography: a pilot study.

Ruschin, Mark LU ; Hemdal, Bengt LU ; Andersson, Ingvar LU ; Börjesson, S; Håkansson, M; Båth, M; Grahn, Anna LU and Tingberg, Anders LU (2005) Second Malmo Conference on Medical X-Ray Imaging In Radiation Protection Dosimetry 114(1-3). p.415-423
Abstract
The effect of pixel size on shape determination in screening digital mammography systems was studied using a shape identification task as the measured outcome. Ten microcalcifications on screen-films were digitised to a range of pixel sizes (2.5-200 μm) and extracted from computed radiography (CR) images (50 μm) acquired under equivalent imaging conditions. Fifteen observers attempted to identify the shape of each microcalcification at each pixel size. The results were collated to provide a fraction of correct responses vs. pixel size curve for each microcalcification. Averaging over all shapes, pixel values > 100 μm lead to a significant decrease in shape determination ability (p < 0.01) for digitised screen-film. For CR images,... (More)
The effect of pixel size on shape determination in screening digital mammography systems was studied using a shape identification task as the measured outcome. Ten microcalcifications on screen-films were digitised to a range of pixel sizes (2.5-200 μm) and extracted from computed radiography (CR) images (50 μm) acquired under equivalent imaging conditions. Fifteen observers attempted to identify the shape of each microcalcification at each pixel size. The results were collated to provide a fraction of correct responses vs. pixel size curve for each microcalcification. Averaging over all shapes, pixel values > 100 μm lead to a significant decrease in shape determination ability (p < 0.01) for digitised screen-film. For CR images, half the shapes were not properly identified. Hence, although 20-100 μm was sufficient for microcalcification shape determination for digitised screen-film images, 50 μm was only borderline sufficient for the CR digital images (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
computed radiography, 2.5 to 200 micron, digitised screen-film, shape identification, digital mammography, microcalcification, shape determination, threshold pixel size
in
Radiation Protection Dosimetry
volume
114
issue
1-3
pages
415 - 423
publisher
Nuclear Technology Publishing
conference name
Second Malmo Conference on Medical X-Ray Imaging
external identifiers
  • wos:000229927400076
  • pmid:15933149
  • scopus:21244472328
ISSN
1742-3406
DOI
10.1093/rpd/nch561
language
English
LU publication?
yes
id
48ac6cbe-674d-49af-b1a3-fe348f35ad10 (old id 140282)
date added to LUP
2007-07-06 07:43:02
date last changed
2017-01-01 06:52:17
@article{48ac6cbe-674d-49af-b1a3-fe348f35ad10,
  abstract     = {The effect of pixel size on shape determination in screening digital mammography systems was studied using a shape identification task as the measured outcome. Ten microcalcifications on screen-films were digitised to a range of pixel sizes (2.5-200 μm) and extracted from computed radiography (CR) images (50 μm) acquired under equivalent imaging conditions. Fifteen observers attempted to identify the shape of each microcalcification at each pixel size. The results were collated to provide a fraction of correct responses vs. pixel size curve for each microcalcification. Averaging over all shapes, pixel values &gt; 100 μm lead to a significant decrease in shape determination ability (p &lt; 0.01) for digitised screen-film. For CR images, half the shapes were not properly identified. Hence, although 20-100 μm was sufficient for microcalcification shape determination for digitised screen-film images, 50 μm was only borderline sufficient for the CR digital images},
  author       = {Ruschin, Mark and Hemdal, Bengt and Andersson, Ingvar and Börjesson, S and Håkansson, M and Båth, M and Grahn, Anna and Tingberg, Anders},
  issn         = {1742-3406},
  keyword      = {computed radiography,2.5 to 200 micron,digitised screen-film,shape identification,digital mammography,microcalcification,shape determination,threshold pixel size},
  language     = {eng},
  number       = {1-3},
  pages        = {415--423},
  publisher    = {Nuclear Technology Publishing},
  series       = {Radiation Protection Dosimetry},
  title        = {Threshold pixel size for shape determination of microcalcifications in digital mammography: a pilot study.},
  url          = {http://dx.doi.org/10.1093/rpd/nch561},
  volume       = {114},
  year         = {2005},
}