Characterization of image quality for 3D scatter-corrected breast CT images

Jan H. Pachon; Jainil Shah; Martin P. Tornai

doi:10.1117/12.878808

16 March 2011 Characterization of image quality for 3D scatter-corrected breast CT images

Jan H. Pachon, Jainil Shah, Martin P. Tornai

Proceedings Volume 7961, Medical Imaging 2011: Physics of Medical Imaging; 796159 (2011) https://doi.org/10.1117/12.878808
Event: SPIE Medical Imaging, 2011, Lake Buena Vista (Orlando), Florida, United States

Abstract

The goal of this study was to characterize the image quality of our dedicated, quasi-monochromatic spectrum, cone beam breast imaging system under scatter corrected and non-scatter corrected conditions for a variety of breast compositions. CT projections were acquired of a breast phantom containing two concentric sets of acrylic spheres that varied in size (1-8mm) based on their polar position. The breast phantom was filled with 3 different concentrations of methanol and water, simulating a range of breast densities (0.79-1.0g/cc); acrylic yarn was sometimes included to simulate connective tissue of a breast. For each phantom condition, 2D scatter was measured for all projection angles. Scatter-corrected and uncorrected projections were then reconstructed with an iterative ordered subsets convex algorithm. Reconstructed image quality was characterized using SNR and contrast analysis, and followed by a human observer detection task for the spheres in the different concentric rings. Results show that scatter correction effectively reduces the cupping artifact and improves image contrast and SNR. Results from the observer study indicate that there was no statistical difference in the number or sizes of lesions observed in the scatter versus non-scatter corrected images for all densities. Nonetheless, applying scatter correction for differing breast conditions improves overall image quality.

Citation Download Citation

Jan H. Pachon, Jainil Shah, and Martin P. Tornai "Characterization of image quality for 3D scatter-corrected breast CT images", Proc. SPIE 7961, Medical Imaging 2011: Physics of Medical Imaging, 796159 (16 March 2011); https://doi.org/10.1117/12.878808

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KEYWORDS

Optical spheres

Breast

Signal to noise ratio

Image quality

Signal attenuation

Computed tomography

Reconstruction algorithms

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