Anti-scatter grid artifact elimination for high resolution x-ray imaging CMOS detectors

R. Rana; V. Singh; A. Jain; D. R. Bednarek; S. Rudin

doi:10.1117/12.2081430

18 March 2015 Anti-scatter grid artifact elimination for high resolution x-ray imaging CMOS detectors

R. Rana, V. Singh, A. Jain, D. R. Bednarek, S. Rudin

Proceedings Volume 9412, Medical Imaging 2015: Physics of Medical Imaging; 941243 (2015) https://doi.org/10.1117/12.2081430
Event: SPIE Medical Imaging, 2015, Orlando, Florida, United States

Abstract

Higher resolution in dynamic radiological imaging such as angiography is increasingly being demanded by clinicians; however, when standard anti-scatter grids are used with such new high resolution detectors, grid-line artifacts become more apparent resulting in increased structured noise that may overcome the contrast signal improvement benefits of the scatter-reducing grid. Although grid-lines may in theory be eliminated by dividing the image of a patient taken with the grid by a flat-field image taken with the grid obtained prior to the clinical image, unless the remaining additive scatter contribution is subtracted in real-time from the dynamic clinical image sequence before the division by the reference image, severe grid-line artifacts may remain. To investigate grid-line elimination, a stationary Smit Rӧntgen X-ray grid (line density: 70 lines/cm, grid ratio 13:1) was used with both a 75 micron-pixel CMOS detector and a standard 194 micron-pixel flat panel detector (FPD) to image an artery block insert placed in a modified uniform frontal head phantom for a 20 x 20cm FOV (approximately). Contrast and contrast-to-noise ratio (CNR) were measured with and without scatter subtraction prior to grid-line correction. The fixed pattern noise caused by the grid was substantially higher for the CMOS detector compared to the FPD and caused a severe reduction of CNR. However, when the scatter subtraction corrective method was used, the removal of the fixed pattern noise (grid artifacts) became evident resulting in images with improved CNR.

Citation Download Citation

R. Rana, V. Singh, A. Jain, D. R. Bednarek, and S. Rudin "Anti-scatter grid artifact elimination for high resolution x-ray imaging CMOS detectors", Proc. SPIE 9412, Medical Imaging 2015: Physics of Medical Imaging, 941243 (18 March 2015); https://doi.org/10.1117/12.2081430

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