Feasibility of ray- and pixel-driven projector/back-projector in linear motion tomosynthesis

Sunghoon Choi; Seungwan Lee; Young-Jin Lee; Ye-Seul Kim; Haeng-Hwa Lee; Hee-Joung Kim

doi:10.1117/12.2081132

18 March 2015 Feasibility of ray- and pixel-driven projector/back-projector in linear motion tomosynthesis

Sunghoon Choi, Seungwan Lee, Young-Jin Lee, Ye-Seul Kim, Haeng-Hwa Lee, Hee-Joung Kim

Proceedings Volume 9412, Medical Imaging 2015: Physics of Medical Imaging; 94122Q (2015) https://doi.org/10.1117/12.2081132
Event: SPIE Medical Imaging, 2015, Orlando, Florida, United States

Abstract

Algorithmic system modeling which includes a geometric motion of source, phantom, and detector for reconstructing the tomographic images is well-known in medical imaging field. Especially in a digital X-ray tomosynthesis system (DTS) which scans an object in limited angle, not a full 360-degree, an accurate system modeling should be derived to reconstruct an excellent cross sectional image. In this study, we analytically modeled a ray-driven forward projector and a pixel-driven back-projector. We firstly acquired forward projected images of a computerized Shepp-Logan phantom over an ±20° angular range using ray-driven projector. On top of that, we reconstructed the analytically scanned phantom using pixel-driven back-projector based on a conventional filtered back-projection (FBP) in tomosynthesis. We evaluated root-mean-square errors (RMSEs) and horizontal profiles of normalized pixel values in the reconstructed axial cross sectional images. The results indicated that pixel-driven back-projector combined with ray-driven projector showed low RMSEs of 0.25, 0.49, 0.80, 1.46, and 0.94 among five different regions-of-interests (ROIs). Illustrated horizontal profiles of normalized pixel values between the referenced phantom and reconstructed object showed similar values, which demonstrated that both ray- and pixel-driven projector/back-projector could be utilized in linear motion DTS.

Citation Download Citation

Sunghoon Choi, Seungwan Lee, Young-Jin Lee, Ye-Seul Kim, Haeng-Hwa Lee, and Hee-Joung Kim "Feasibility of ray- and pixel-driven projector/back-projector in linear motion tomosynthesis", Proc. SPIE 9412, Medical Imaging 2015: Physics of Medical Imaging, 94122Q (18 March 2015); https://doi.org/10.1117/12.2081132

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