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Cone-beam CT (CBCT) is been increasingly used in radiation therapy for patient setup, dose verification and adaptive planning. However, the non-uniformity artifacts on CBCT images mainly caused by x-ray scatter contamination are considered as one of the fundamental limitations that prevents CBCT from widespread clinical practice. In this study, we propose an image-domain non-uniformity correction...
Ultrasound image fusion has been widely used in interventional surgeries, providing surgeons both detailed structural information via CT/MRI and real-time ultrasound information. However, patient respiration induced quasi-periodic organ motion usually leads to unacceptable registration and fusion errors. In this paper, we propose a method to build a patient specific respiratory motion model and make...
Open Computing Language (OpenCL) is a fundamental technology for cross-platform parallel programming. The emerging of OpenCL provides portable and efficient access to the power of modern processors. This revolutionary new technology is applied to accelerate the reconstruction of cone beam computed tomography (CBCT) on Graphics Processing Unit (GPU) in this paper. An OpenCL-based implementation of...
Circular trajectories are commonly used in cone-beam (CB) CT. Insufficient data measurement in such a geometry induces CB artifacts in CT images. Development of an efficient algorithm to reduce this problem remains a major challenge. A backprojection-based method is proposed here. Each CB projection is analyzed in radon space via Grangeat's formula. Assuming the CB projection is taken from a parallel...
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