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Proceedings Paper

OPDIMA: large-area CCD-based x-ray image sensor for spot imaging and biopsy control in mammography
Author(s): Stefan J. Thunberg; Hartmut Sklebitz; Bengt Ekdahl; Lothar Baetz; Anders Lundin; Hans Moeller; Frank Fleischmann; Gregory Kreider; Tom Weidner
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Paper Abstract

The detection characteristics of digital x-ray and film-screen mammography systems are different and thus current film-screen techniques are not ideal for digital mammography. Therefore optimum technical parameters required for digital mammography are likely to be different compared with film-screen mammography. The goal of this study is to evaluate the optimum technical parameters for full-field digital mammography by experimental and computer simulation methods. A General Electric Full Field Digital Mammography (FFDM) prototype unit using Cesium Iodide (CsI) on an amorphous Silicon photodiode array was used for the experimental measurements. Using breast equivalent phantoms, images were acquired for a set of x-ray target-filters for a range of peak kilovoltage, varying breast composition and thickness, with and without an anti-scatter grid. The signal-to-noise ratio (SNR) and figure-of-merit (FOM) were determined for simulated calcification and mass targets, independently by the two methods. The results for noise, contrast, SNR and FOM were compared and agree within 5% and 6% respectively. Combined results are presented for the case of 50% glandular - 50% adipose tissue breast composition using the grid and for the calcification target. Based on the FOM approach, preliminary results suggest that a Rhodium target-filter combination will be beneficial for higher breast thickness and for denser breasts.

Paper Details

Date Published: 28 May 1999
PDF: 9 pages
Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999); doi: 10.1117/12.349488
Show Author Affiliations
Stefan J. Thunberg, Siemens Elema AB (Sweden)
Hartmut Sklebitz, Siemens Medical Engineering (Germany)
Bengt Ekdahl, Siemens Elema AB (Sweden)
Lothar Baetz, Siemens Medical Engineering (Germany)
Anders Lundin, Siemens Elema AB (Sweden)
Hans Moeller, Siemens Elema AB (Sweden)
Frank Fleischmann, OES GmbH (Germany)
Gregory Kreider, Philips Imaging Technologies (Netherlands)
Tom Weidner, Siemens Medical Engineering (Germany)


Published in SPIE Proceedings Vol. 3659:
Medical Imaging 1999: Physics of Medical Imaging
John M. Boone; James T. Dobbins, Editor(s)

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