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Evaluation of a photon-counting X-ray imaging system
KTH, Superseded Departments, Physics.
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2001 (English)In: IEEE Transactions on Nuclear Science, ISSN 0018-9499, E-ISSN 1558-1578, Vol. 48, no 4, 1530-1536 p.Article in journal (Refereed) Published
Abstract [en]

A digital imaging system has been developed for mammography using silicon strip detectors operated in a pulse-counting mode and configured in a scanned slit geometry. More than 90% of the photons are absorbed in the sensor. The scatter rejection is very efficient and the image formation is nearly optimal since each X ray is processed individually. The result is a very dose-efficient system. In this paper, we present measurements that verify that the performance of the readout electronics is sufficient to count photons at high rates with high quantum efficiency and a charge collection efficiency that does not limit the dose efficiency. The spatial resolution of the system was measured to provide a modulation transfer function of approximately 0.5 at a spatial frequency of 10 lp/mm. Images of a mammography phantom were recorded experimentally to test overall system performance.

Place, publisher, year, edition, pages
2001. Vol. 48, no 4, 1530-1536 p.
Keyword [en]
energy weighting, mammography, photon counting, scanned slit geometry, silicon strip detector, mammography
URN: urn:nbn:se:kth:diva-21033ISI: 000171660700031OAI: diva2:339730
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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