The n-PI-method for helical cone-beam CT
نویسندگان
چکیده
منابع مشابه
The PI-FAST Method for Approximate Helical Cone-Beam Reconstruction
The original PI-method is a non-exact method for 3Dreconstruction using cone-beam projections acquired from a helical source trajectory. In the new PI-FAST method, our aim is to reduce the artifacts while keeping the algorithmic simplicity. The detector is still bounded by the Tam-window, which makes the data capture complete and non-redundant. Also, the filtering step still consists of 1D ramp...
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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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Next generation helical cone-beam CT will feature pitches around 80 mm. It is predicted that reconstruction algorithms to be used in these machines with still rather modest cone angles may not necessarily be exact, but rather have an emphasis on simplicity and speed. The PI-methods are a family of algorithms, all of which are based on complete data capture with a detector collimated to the Tam-...
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The development of accurate and efficient algorithms for image reconstruction from helical cone-beam projections remains a subject of active research. In the last few years, a number of quasi-exact and exact algorithms have been developed. Among them, the Katsevich algorithms are of filtered backprojection type and thus possess computational advantages over other existing exact algorithms. In t...
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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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ژورنال
عنوان ژورنال: IEEE Transactions on Medical Imaging
سال: 2000
ISSN: 0278-0062
DOI: 10.1109/42.887834