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Proceedings Paper

Performance evaluation of a high-strip-density grid using a contrast-detail phantom
Author(s): Terence B. Terilli; Maxine Barnes; Ajoy Dutta; Zheng Feng Lu; Edward L. Nickoloff
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Paper Abstract

A contrast-detail phantom was used to evaluate grid performance. The phantom is constructed of 1 cm of plastic. Holes of varying diameter (detail) and varying depth (contest) were drilled into the contrast-detail phantom. The phantom was placed next to the bucky assembly. A 15 cm block of lucite was placed between the x ray tube and the phantom. A set of radiographs were taken of the phantom at different kVps and different phantom thicknesses. This was done both with and without the grid in place. An ion chamber was used so that the bucky factor could be determined. This entire procedure was repeated for the conventional, reciprocating grid. Contrast-detail curves were generated from the data. As would be expected the reciprocating grid had a lower bucky factor. The contrast improvement factor (contrast with grid/contrast without grid) was higher for the reciprocating grid. The contrast improvement factor for the high-strip- density grid was comparable to that for the reciprocating grid at high kVps and also when a thinner block of lucite was used. Grid lines were seen on the radiographs of the high-strip-density grid.

Paper Details

Date Published: 16 April 1997
PDF: 15 pages
Proc. SPIE 3036, Medical Imaging 1997: Image Perception, (16 April 1997); doi: 10.1117/12.271298
Show Author Affiliations
Terence B. Terilli, Columbia Univ. College of Physicians and Surgeons (United States)
Maxine Barnes, Columbia Univ. College of Physicians and Surgeons (United States)
Ajoy Dutta, Columbia Univ. College of Physicians and Surgeons (United States)
Zheng Feng Lu, Columbia Univ. College of Physicians and Surgeons (United States)
Edward L. Nickoloff, Columbia Univ. College of Physicians and Surgeons (United States)


Published in SPIE Proceedings Vol. 3036:
Medical Imaging 1997: Image Perception
Harold L. Kundel, Editor(s)

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