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Proceedings Paper

Contrast enhancement measurement using polycapillary x-ray optics at 20 to 40 keV
Author(s): Padiyar Cari; - Suparmi; Walter M. Gibson; Carolyn A. MacDonald
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Paper Abstract

Polycapillary optics are shaped arrays of tiny hollow tubes through which x rays are guided by total external reflection at grazing incidence. Optics could be used prepatient, to shape the beam, or post patient, as scatter rejection grids. Significant resolution and contrast enhancement have been previously demonstrated at mammographic and lower energies for post patient optics. Measurements were performed to investigate the application of polycapillary post patient optics at higher energies. Measurement of contrast enhancement was performed using a small tapered optic. This tapered optic was designed to be placed into a multiple taper jig to create a large area device. The transmission of the taper was 71% at 20 keV and close to 30% at 40 keV. The scatter transmission of the taper, measured using a 6 cm thick polyethylene phantom, was about 1% at 40 keV. Because of the removal of scatter radiation, the measured contrast enhancement for the optic was a nearly factor of three at 40 keV.

Paper Details

Date Published: 28 June 2001
PDF: 9 pages
Proc. SPIE 4320, Medical Imaging 2001: Physics of Medical Imaging, (28 June 2001); doi: 10.1117/12.430941
Show Author Affiliations
Padiyar Cari, SUNY/Albany (United States)
- Suparmi, SUNY/Albany (United States)
Walter M. Gibson, SUNY/Albany (United States)
Carolyn A. MacDonald, SUNY/Albany (United States)

Published in SPIE Proceedings Vol. 4320:
Medical Imaging 2001: Physics of Medical Imaging
Larry E. Antonuk; Martin Joel Yaffe, Editor(s)

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