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Proceedings Paper

Contrast visibility of simulated microcalcifications in full field mammography systems
Author(s): Ann-Katherine Carton; Hilde Bosmans; Chantal Van Ongeval; Geert Souverijns; Frank Rogge; Guy Marchal
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Paper Abstract

We evaluated the visibility of simulated subtle microcalcifications in real digital mammograms acquired with a flat-panel system (GE) and a CR system (Fuji). Ideal templates of microcalcifications were created, based on the attenuation characteristics of subtle microcalcifications from biopsied specimen in magnified images. X-ray transmission coefficients were expressed in Al-equivalent thickness. In this way, the X-ray transmission of a particular lesion could be re-calculated for other X-ray beams, different mammography systems and for different breast thickness. Extra corrections for differences in spatial resolution were based on the pre-sampled MTF. Zero to 10 simulated microcalcifications were randomly distributed in square frames. These software phantoms were then inserted in sets of raw mammograms of the modalities under study. The composed images were compressed, processed and printed as in clinical routine. Two experienced radiologists indicated the locations of the microcalcifications and rated their detection confidence. It is possible to assess the visibility of 'well controlled’ microcalcifications in digital clinical mammograms. Microcalcifications were better visible in the CR images than in the flat panel images. This psychophysical method comes close to the radiologists’ practice. It allows fpr including processing and visualization in the analysis and was well appreciated by our radiologists.

Paper Details

Date Published: 22 May 2003
PDF: 12 pages
Proc. SPIE 5034, Medical Imaging 2003: Image Perception, Observer Performance, and Technology Assessment, (22 May 2003); doi: 10.1117/12.480092
Show Author Affiliations
Ann-Katherine Carton, Univ. Hospital Leuven (Belgium)
Hilde Bosmans, Univ. Hospital Leuven (Belgium)
Chantal Van Ongeval, Univ. Hospital Leuven (Belgium)
Geert Souverijns, Univ. Hospital Leuven (Belgium)
Frank Rogge, Univ. Hospital Leuven (Belgium)
Guy Marchal, Univ. Hospital Leuven (Belgium)

Published in SPIE Proceedings Vol. 5034:
Medical Imaging 2003: Image Perception, Observer Performance, and Technology Assessment
Dev P. Chakraborty; Elizabeth A. Krupinski, Editor(s)

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