Evaluation of the additive noise of a flat panel detector and its effect on cone-beam CT applications

Kai Yang; Shih-Ying C. Huang; Nathan J. Packard; John M. Boone

doi:10.1117/12.813563

10 March 2009 Evaluation of the additive noise of a flat panel detector and its effect on cone-beam CT applications

Kai Yang, Shih-Ying C. Huang, Nathan J. Packard, John M. Boone

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 725806 (2009) https://doi.org/10.1117/12.813563
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

Cone-beam systems designed for breast cancer detection bear a unique radiation dose limitation and are vulnerable to the additive noise from the detector. Additive noise is the signal fluctuation from detector elements and is independent of the incident exposure level. In this study, two different approaches (single pixel based and region of interest based) to measure the additive noise were explored using continuously acquired air images at different exposure levels, with both raw images and flat-field corrected images. The influence from two major factors, inter-pixel variance and image lag, were studied. The pixel variance measured from dark images was used as the gold standard (for the entire detector 15.12±1.3 ADU²) for comparison. Image noise propagation through reconstruction procedures was also investigated and a mathematically derived quadratic relationship between the image noise and the inverse of the radiation dose was confirmed with experiment data. The additive noise level was proved to affect the CT image noise as the second order coefficient and thus determines the lower limit of the scan radiation dose, above which the scanner operates at quantum limited region and utilizes the x-ray photon most efficiently.

Citation Download Citation

Kai Yang, Shih-Ying C. Huang, Nathan J. Packard, and John M. Boone "Evaluation of the additive noise of a flat panel detector and its effect on cone-beam CT applications", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 725806 (10 March 2009); https://doi.org/10.1117/12.813563

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