The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Portrait of Anders Tingberg. Photo

Anders Tingberg

Associate professor

Portrait of Anders Tingberg. Photo

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

Author

  • Mark Ruschin
  • Bengt Hemdal
  • Ingvar Andersson
  • S Börjesson
  • M Håkansson
  • M Båth
  • Anna Grahn
  • Anders Tingberg

Summary, in English

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

Department/s

  • Medical Radiation Physics, Malmö
  • Department of Translational Medicine

Publishing year

2005

Language

English

Pages

415-423

Publication/Series

Radiation Protection Dosimetry

Volume

114

Issue

1-3

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Radiology, Nuclear Medicine and Medical Imaging

Keywords

  • computed radiography
  • 2.5 to 200 micron
  • digitised screen-film
  • shape identification
  • digital mammography
  • microcalcification
  • shape determination
  • threshold pixel size

Conference name

Second Malmo Conference on Medical X-Ray Imaging

Conference date

2004-04-25

Conference place

Malmo, Sweden

Status

Published

Research group

  • Medical Radiation Physics, Malmö

ISBN/ISSN/Other

  • ISSN: 1742-3406