Accession Number : ADA303164

Title :   Postdoctoral Fellowship Study of X-Ray Optical Mammograph.

Descriptive Note : Annual rept. 30 Sep 94-29 Sep 95,

Corporate Author : STATE UNIV OF NEW YORK AT ALBANY

Personal Author(s) : MacDonald, Carolyn A. ; Abreu, Carmen C.

PDF Url : ADA303164

Report Date : OCT 1995

Pagination or Media Count : 16

Abstract : A number of feasibility measurements of the x-ray imaging properties of a capillary prototype optic for digital mammography were performed. The capillary prototype optic had input and output diameters of 4.15 mm and 7.5 mm, respectively. A mammographic scanning system was constructed to allow imaging of a larger field for some of the measurements. The optic showed good primary transmission (46%) at mammography energies. Images of a lucite contrast detail phantom, using a lead blocker, showed that the optic provides an increase in image contrast with a contrast improvement of 1.72 and a reduction of the scatter fraction to 0.018. The limiting resolution for the phosphor plate system (CR) was measured through the modulation transfer function (NTF). The 5% MTF for the stationary and scanned optic was 9 lp/mm and 8.4 lp/mm, respectively, compared with 5.4 lp/mm without the optics using a 0.3 mm focal spot and optimal magnification.

Descriptors :   *OPTICS, *OPTICAL IMAGES, *X RAYS, *MAMMARY GLANDS, *BREAST CANCER, *MAMMOGRAPHY, OUTPUT, DIAMETERS, MEASUREMENT, CONTRAST, OPTIMIZATION, TRANSFER FUNCTIONS, RESOLUTION, PROTOTYPES, TRANSMITTANCE, FEASIBILITY STUDIES, LIMITATIONS, IMAGES, MODULATION, CAPILLARITY, MAGNIFICATION, SCANNERS.

Subject Categories : Medicine and Medical Research
      Anatomy and Physiology
      Radiobiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE