Performance evaluation of a high-strip-density grid using a contrast-detail phantom

Terence B. Terilli; Maxine Barnes; Ajoy Dutta; Zheng Feng Lu; Edward L. Nickoloff

doi:10.1117/12.271298

16 April 1997 Performance evaluation of a high-strip-density grid using a contrast-detail phantom

Terence B. Terilli, Maxine Barnes, Ajoy Dutta, Zheng Feng Lu, Edward L. Nickoloff

Proceedings Volume 3036, Medical Imaging 1997: Image Perception; (1997) https://doi.org/10.1117/12.271298
Event: Medical Imaging 1997, 1997, Newport Beach, CA, United States

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.

Citation Download Citation

Terence B. Terilli, Maxine Barnes, Ajoy Dutta, Zheng Feng Lu, and Edward L. Nickoloff "Performance evaluation of a high-strip-density grid using a contrast-detail phantom", Proc. SPIE 3036, Medical Imaging 1997: Image Perception, (16 April 1997); https://doi.org/10.1117/12.271298

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