Evaluation of a cone beam CT artefact reduction algorithm
نویسندگان
چکیده
منابع مشابه
Evaluation of a Ct to Cone-beam Ct Deformable Registration Algorithm
Purpose and Objectives The advent of on-board cone-beam CT (CBCT) imagers for radiation therapy delivery devices offers the potential for daily dosimetry and adaptive therapy. Heretofore this potential has been limited by several artifacts in the CBCT volumes which may require surrogates with reliable density values to be used for recalculation of dosimetry, such as a CT volume deformed to the ...
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The most popular Feldkamp algorithm for cone-beam image reconstruction assumes a scanning circle, and performs well only with a small cone angle. In this report, we propose a Feldkamp-type algorithm to increase the cone angle by several folds at a radiation dose comparable to that required by the classic Feldkamp algorithm. In our scheme, two half-scans of different radii are used. Then, approx...
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Modern CT and micro-CT scanners are rapidly moving from fan-beam toward cone-beam geometry. Half-scan CT algorithms are advantageous in terms of temporal resolution, and widely used in fan-beam and cone-beam geometry. While existing half-scan algorithms for cone-beam CT are in the Feldkamp framework, in this paper we compensate missing data explicitly in the Grangeat framework, and formulate a ...
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Image segmentation and delineation is at the heart of modern radiotherapy, where the aim is to deliver as high a radiation dose as possible to a cancerous target whilst sparing the surrounding healthy tissues. This, of course, requires that a radiation oncologist dictates both where the tumour and any nearby critical organs are located. As well as in treatment planning, delineation is of vital ...
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ژورنال
عنوان ژورنال: Dentomaxillofacial Radiology
سال: 2012
ISSN: 0250-832X,1476-542X
DOI: 10.1259/dmfr/43691321