Comparison of anti-scatter grids for digital imaging with use of a direct-conversion flat-panel detector

Our purpose in this study was to establish a selection standard for anti-scatter grids for a direct conversion flat-panel detector (FPD) system. As indices for grid evaluation, we calculated the selectivity, Bucky factor, and the signal-to-noise ratio improvement factor (SIF) by measuring rates of s...

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Bibliographic Details
Published in:Radiological physics and technology 2012-01, Vol.5 (1), p.46-52
Main Authors: Mizuta, Masayoshi, Sanada, Shigeru, Akazawa, Hiroyuki, Kasai, Toshifumi, Abe, Shuji, Ikeno, Yasuhiro, Mitou, Shigeki
Format: Article
Language:English
Subjects:
Imaging
Medical and Radiation Physics
Medicine
Medicine & Public Health
Nuclear Medicine
Radiology
Radiotherapy
Scattering, Radiation
Signal-To-Noise Ratio
Tomography, X-Ray Computed - instrumentation
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Summary:Our purpose in this study was to establish a selection standard for anti-scatter grids for a direct conversion flat-panel detector (FPD) system. As indices for grid evaluation, we calculated the selectivity, Bucky factor, and the signal-to-noise ratio improvement factor (SIF) by measuring rates of scatter transmission, primary transmission, and total transmission (based on the digitally displayed measurement values of the FPD system), using 4 acrylic phantoms of different thicknesses. The results showed that the SIF was less than 1.0 when the phantom thickness was 5 cm. When the phantom thickness was 25 cm and the grid ratio was 16:1, the SIF was 1.505 and 1.518 (maximum value) at 90 and 120 kV, respectively. Compared with the grid ratio of 12:1, the SIF at the grid ratio 16:1 was improved by 6.1% at 90 kV, and by 7.0% at 120 kV. In a direct-conversion FPD system, the grid ratio of 16:1 is considered adequate for eliminating the scattered-radiation effect when much scattered radiation is present, such as with a thick imaged object or a high X-ray tube voltage.
ISSN:1865-0333
1865-0341
DOI:10.1007/s12194-011-0134-1