Excessive radiation exposure is still a major concern in 4D cone-beam computed tomography (4D-CBCT) due to its prolonged scanning duration. Radiation dose can be effectively reduced by either under-sampling the x-ray projections or reducing the x-ray flux. However, 4D-CBCT reconstruction under such low-dose protocols is prone to image artifacts and noise. In this work, we propose a novel joint regularization-based iterative reconstruction method for low-dose 4D-CBCT. To tackle the under-sampling problem, we employ spatiotemporal tensor framelet (STF) regularization to take advantage of the spatiotemporal coherence of the patient anatomy in 4D images. To simultaneously suppress the image noise caused by photon starvation, we also incorporate spatiotemporal nonlocal total variation (SNTV) regularization to make use of the nonlocal self-recursiveness of anatomical structures in the spatial and temporal domains. Under the joint STF–SNTV regularization, the proposed iterative reconst...
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Objectives Adult sagittal posture is established during childhood and adolescence. A flattened or hypercurved spine is associated with poore...
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Abstract Soil conditioners can be used to compensate for the insufficient soil nutrition and organic matter (OM) of arable soils. However, ...
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Caring for Patients with Physical Disabilities: Assessment of an Innovative Spinal Cord Injury Session that Addresses an Educational Gap Des...
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ORL 2017;79:164-165 from #AlexandrosSfakianakis via Alexandros G.Sfakianakis on Inoreader http://ift.tt/2oKOLwE via IFTTT
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ACS Nano DOI: 10.1021/acsnano.7b02058 from #AlexandrosSfakianakis via Alexandros G.Sfakianakis on Inoreader http://ift.tt/2pOv8F4 via...
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Background First rib fractures are considered indicators of increased morbidity and mortality in major trauma. However, this has not been de...
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Abstract The first absolute experimental bond dissociation energies (BDEs) for the main heterolytic bond cleavages of four benzylpyridiniu...
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