Skip Navigation

Radiation Protection Dosimetry 2005 114(1-3):415-423; doi:10.1093/rpd/nch561
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (5)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Ruschin, M.
Right arrow Articles by Tingberg, A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Ruschin, M.
Right arrow Articles by Tingberg, A.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

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

M. Ruschin1,*, B. Hemdal1, I. Andersson2, S. Börjesson3, M. Håkansson3, M. Båth3, A. Grahn1 and A. Tingberg1

1 Department of Medical Radiation Physics, Lund University, Malmö University Hospital, Malmö, Sweden
2 Department of Diagnostic Radiology, Lund University, Malmö University Hospital, Malmö, Sweden
3 Department of Medical Physics and Biomedical Engineering, Sahlgrenska University Hospital, Göteborg, Sweden

* Corresponding author: mark.ruschin{at}rfa.mas.lu.se

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.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 RadiologyHome page
S. Suryanarayanan, A. Karellas, S. Vedantham, I. Sechopoulos, and C. J. D'Orsi
Detection of Simulated Microcalcifications in a Phantom with Digital Mammography: Effect of Pixel Size
Radiology, July 1, 2007; 244(1): 130 - 137.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.