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Evaluation of the contrast-detail response of a cardiovascular angiography system and the influence of equipment variables on image quality
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Paper Abstract

Purpose: To investigate the influence of physician-selectable equipment variables on image quality for a cardiac X-ray system equipped with flat panel detector. Materials and Methods: Two contrast phantoms (Leeds TO.10 and CDRAD) were imaged in fluorography and fluoroscopy mode. Three variables are studied: the detector entrance dose, patient thickness and antiscatter grid. In fluorography mode, the detector entrance dose was 100, 120, 140, 170, 200 and 240 nGy/image. Patient thickness was simulated with Perspex blocks of 8, 12, 16 and 20cm. The detectability of contrast details was visually evaluated by five observers (subjective method). An alternative objective method of image quality evaluation was used. It consists on determining a simple "figure of merit" parameter based on signal-to-noise and dose measurements. Results: The threshold contrast values were determined for different settings. Contrast-detail curves are presented. Conversion of curve data in single numerical values and comparison with the "figure of merit" are discussed. Conclusion: Contrast detail objects are sensitive to variables changed and can be used in optimization process of new systems. The change of detector entrance dose from a superior to a next inferior setting does not change dramatically the image quality. Consequently, a saving of about 15% in patient "skin" dose is achievable.

Paper Details

Date Published: 19 March 2008
PDF: 12 pages
Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 69134R (19 March 2008); doi: 10.1117/12.769780
Show Author Affiliations
Octavian Dragusin, Univ. Hospitals Leuven (Belgium)
Kristien Smans, Univ. Hospitals Leuven (Belgium)
Jurgen Jacobs, Univ. Hospitals Leuven (Belgium)
Tolga Inal, Ankara Univ. (Turkey)
Hilde Bosmans, Univ. Hospitals Leuven (Belgium)

Published in SPIE Proceedings Vol. 6913:
Medical Imaging 2008: Physics of Medical Imaging
Jiang Hsieh; Ehsan Samei, Editor(s)

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