Contrast enhancement measurement using polycapillary x-ray optics at 20 to 40 keV

Padiyar Cari; - Suparmi; Walter M. Gibson; Carolyn A. MacDonald

doi:10.1117/12.430941

28 June 2001 Contrast enhancement measurement using polycapillary x-ray optics at 20 to 40 keV

Padiyar Cari, - Suparmi, Walter M. Gibson, Carolyn A. MacDonald

Proceedings Volume 4320, Medical Imaging 2001: Physics of Medical Imaging; (2001) https://doi.org/10.1117/12.430941
Event: Medical Imaging 2001, 2001, San Diego, CA, United States

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.

Citation Download Citation

Padiyar Cari, - Suparmi, Walter M. Gibson, and Carolyn A. MacDonald "Contrast enhancement measurement using polycapillary x-ray optics at 20 to 40 keV", Proc. SPIE 4320, Medical Imaging 2001: Physics of Medical Imaging, (28 June 2001); https://doi.org/10.1117/12.430941

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