نتایج جستجو برای: beam ct
تعداد نتایج: 242842 فیلتر نتایج به سال:
We report on our first results on the use of Algebraic Reconstruction Techniques (ART) on helical cone-beam Computerized Tomography (CT) data. Two variants of ART have been implemented: a standard one which considers a single ray in an iterative step and a block version which groups several conebeam projections in calculating an iterative update. Both seem to produce high-quality reconstruction...
Background: During the past few decades, changes have been observed not only in the prevalence of dental caries, but also in the distribution and pattern of the disease in the population. Most conventional radiographic imaging of teeth underestimates the presence of caries. Cone-beam CT is a new technology which can provide volumetric data of the object, from which cross-sectional images can be...
PURPOSE This paper introduces a novel autocalibration method for cone-beam-CTs (CBCT) or flat-panel CTs, assuming a perfect rotation. The method is based on ellipse-fitting. Autocalibration refers to accurate recovery of the geometric alignment of a CBCT device from projection images alone, without any manual measurements. METHODS The authors use test objects containing small arbitrarily posi...
A bowtie is a filter used to shape an x-ray beam and equalize its flux reaching different detector channels. For development of spectral CT with energy discriminating photon-counting (EDPC) detectors, here we propose and evaluate a dynamic bowtie for performance optimization based on a patient model or a scout scan. With a mechanical rotation of a dynamic bowtie and an adaptive adjustment of an...
COMPARATIVE LINEAR ACCURACY OF CONE BEAM CT DERIVED 3D IMAGES IN ORTHODONTIC ANALYSIS April A. Brown, BS, D.M.D.
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