Exact and approximate algorithms for helical cone-beam CT
نویسندگان
چکیده
منابع مشابه
Exact and approximate algorithms for helical cone-beam CT.
This paper concerns image reconstruction for helical x-ray transmission tomography (CT) with multi-row detectors. We introduce two approximate cone-beam (CB) filtered-backprojection (FBP) algorithms of the Feldkamp type, obtained by extending to three dimensions (3D) two recently proposed exact FBP algorithms for 2D fan-beam reconstruction. The new algorithms are similar to the standard Feldkam...
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In this paper, four approximate cone-beam CT reconstruction algorithms are compared: Advanced single slice rebinning (ASSR) as a representative of algorithms employing a two dimensional approximation, PI, PI-SLANT, and 3-PI which all use a proper three dimensional back-projection. A detailed analysis of the image artifacts produced by these techniques shows that aliasing in the z-direction is t...
متن کاملA combination of rebinning and exact reconstruction algorithms for helical cone-beam CT
M.D. is with the Department of Nuclear Medicine, AZ-VUB, Free University Brussels, Belgium ([email protected]). F.N. is with the Department of Radiology, University of Utah, Salt Lake City ([email protected]) H.K. is with the Department of Information Science and Electronics, University of Tsukuba, Japan ([email protected]) b) Rebinning: estimation of a complete 2D tomographic ...
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In the current paper we consider the Helical Cone Beam CT. This scanning method exposes the patient to large quantities of radiation and results in very large amounts of data being collected and stored. Both these facts are prime motivators for the development of an efficient, reduced rate, sampling pattern. We calculate bounds on the support in the frequency domain of the collected data and us...
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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...
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ژورنال
عنوان ژورنال: Physics in Medicine and Biology
سال: 2004
ISSN: 0031-9155,1361-6560
DOI: 10.1088/0031-9155/49/13/011