Scatter correction using beam stop array algorithm for cone-beam CT breast imaging

Weixing Cai; Ruola Ning; David Conover

doi:10.1117/12.655587

2 March 2006 Scatter correction using beam stop array algorithm for cone-beam CT breast imaging

Weixing Cai, Ruola Ning, David Conover

Proceedings Volume 6142, Medical Imaging 2006: Physics of Medical Imaging; 61423E (2006) https://doi.org/10.1117/12.655587
Event: Medical Imaging, 2006, San Diego, California, United States

Abstract

In flat-panel detector-based cone-beam CT breast imaging (CBCTBI), scatter is an important factor that degrades image quality. It has been shown that despite the use of a large air gap, scatter still causes problems when imaging a large breast phantom with our CBCTBI prototype. The SPR at the center region near the chest wall of a C-cup phantom is about 0.5, and this value goes up to 0.9 for the D-cup phantom. As a result, the linear attenuation coefficient (LAC) distortion and reduced contrast were obvious in the reconstruction slices. To conquer the scattering problem, the beam-stop array (BSA) algorithm was presented in previous papers by our group. Since the breast is nearly axially symmetric, only one or two more projections for scatter images are required for the BSA algorithm. Therefore, the angular interpolation part in the algorithm could be simplified. The accuracy of the BSA algorithm is evaluated with a water phantom and the error of LAC reconstruction is proven to be less than 2%. The results of a C-cup phantom study shows that the LAC distortion in CBCT breast imaging could be corrected, and the CNR of target tumors is increased by a small amount. The number of sampled scattering patterns for CBCTBI is also discussed. The results showed that the BSA algorithm worked well for our CBCTBI prototype system. It could remove the scatter efficiently and improve the image quality.

Citation Download Citation

Weixing Cai, Ruola Ning, and David Conover "Scatter correction using beam stop array algorithm for cone-beam CT breast imaging", Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61423E (2 March 2006); https://doi.org/10.1117/12.655587

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