Physics of Medical Imaging

Quantifying cross-scatter contamination in biplane fluoroscopy motion analysis systems

[+] Author Affiliations
Janelle A. Cross, Ben McHenry, Taly Gilat Schmidt

Marquette University, Department of Biomedical Engineering, 1515 W. Wisconsin Avenue, Milwaukee, Wisconsin 53233, United States

J. Med. Imag. 2(4), 043503 (Oct 23, 2015). doi:10.1117/1.JMI.2.4.043503
History: Received April 17, 2015; Accepted September 24, 2015
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Abstract.  Biplane fluoroscopy is used for dynamic in vivo three-dimensional motion analysis of various joints of the body. Cross-scatter between the two fluoroscopy systems may limit tracking accuracy. This study measured the magnitude and effects of cross-scatter in biplane fluoroscopic images. Four cylindrical phantoms of 4-, 6-, 8-, and 10-in. diameter were imaged at varying kVp levels to determine the cross-scatter fraction and contrast-to-noise ratio (CNR). Monte Carlo simulations quantified the effect of the gantry angle on the cross-scatter fraction. A cadaver foot with implanted beads was also imaged. The effect of cross-scatter on marker-based tracking accuracy was investigated. Results demonstrated that the cross-scatter fraction varied from 0.15 for the 4-in. cylinder to 0.89 for the 10-in. cylinder when averaged across kVp. The average change in CNR due to cross-scatter ranged from 5% to 36% CNR decreases for the 4- and 10-in. cylinders, respectively. In simulations, the cross-scatter fraction increased with the gantry angle for the 8- and 10-in. cylinders. Cross-scatter significantly increased static-tracking error by 15%, 25%, and 38% for the 6-, 8-, and 10-in. phantoms, respectively, with no significant effect for the foot specimen. The results demonstrated submillimeter marker-based tracking for a range of phantom sizes, despite cross-scatter degradation.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Janelle A. Cross ; Ben McHenry and Taly Gilat Schmidt
"Quantifying cross-scatter contamination in biplane fluoroscopy motion analysis systems", J. Med. Imag. 2(4), 043503 (Oct 23, 2015). ; http://dx.doi.org/10.1117/1.JMI.2.4.043503


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