In X-ray computed tomography (CT), the presence of metal objects in a patient's body produces streak artifacts in the reconstructed images. During the past decades, many different methods were proposed for the reduction or elimination of the streaking artifacts. When scanning a patient, the projection data affected by metal objects (missing projections) appear as regions with high intensities i...

High-attenuation object-induced streaking and shadow artifacts in computerized tomography (CT) are somewhat connected to the misfit of the X-ray projection data to the range space of the Radon transform. This misfit is mainly due to the beam hardening factor of the projection data which is unavoidable for polychromatic sources. The major difficulty in dealing with the beam hardening-induced str...

OBJECTIVE Artifacts caused by metallic objects, such as dental crowns, dental implants and metallic orthodontic appliances, are a common problem in head and neck MRI. The aim of this retrospective study was to identify the main metal dental objects that produce artifacts on brain MRIs. STUDY DESIGN Imaged metallic artifacts and their sources were identified. Artifact image plane was rated on ...

RATIONALE AND OBJECTIVES We propose a novel segmentation-based interpolation method to reduce the metal artifacts caused by surgical aneurysm clips. MATERIALS AND METHODS Our method consists of five steps: coarse image reconstruction, metallic object segmentation, forward-projection, projection interpolation, and final image reconstruction. The major innovations are 2-fold. First, a state-of-...

PURPOSE To investigate dosimetric consequences of patient metal prosthesis in prostate radiotherapy, considering the body heterogeneity, metal artifacts, prostate daily displacements and target delineation. METHODS Three prostate patients with metal prosthesis were simulated with CT images and 3D ultrasound images. Conformal RT treatment plans were generated based on target volumes delineated...

ID: 8312 Title: The use of dual-energy CT images for Monte Carlo treatment planning: material extraction and metal artifact reduction Purpose: To investigate the feasibility of dual-energy CT-based material extraction (DECT) for Monte Carlo (MC) dose calculations, to evaluate metal streaking artifact reduction using DECT and to propose a novel scanning technique for motion artifacts reduction. ...

This paper examines the heavy metal genre as a popular form of apocalypticism, i.e., warning reminder or “premediation” potentially (large-scale) lethal crises. By confronting audience with disturbing, seemingly exaggerated scenarios disease, chaos, war, and horror, builds barriers in culture against what philosopher Günther Anders has called “apocalyptic blindness.” The genre, then, offers kin...