A variable-resolution rotate-only computed tomography scanner.
The Rotoscan is a computed tomography scanner that combines the advantages of variable geometric resolution and adjustable size of measurement diameter of translate-rotate scanners with the improved speed of rotate-only scanners. Because of the small number of only 26 detectors used for this scanner, a special data collection scheme of multiple rotations with interleaved detector positions was employed. In order to avoid angular data interpolation after reordering of the projections from the fan- to a parallel-beam geometry, the detectors were incrementally moved at a right angle to the centerline of the fan rather than rotated about the source. The measurement time of 40 s for one cross-section is comparable to that of second-generation systems. However, for longer measurement diameters, the measurement time for second-generation systems increases, whereas that of the Rotoscan remains constant.
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BioMedical Imaging Laboratory, Wright State University, Dayton, Ohio.
D000465:Algorithms; D004867:Equipment Design; D006801:Humans; D008433:Mathematics; D008962:Models, Theoretical; D014057:Tomography, X-Ray Computed / Q000295:instrumentation* / Q000379:methods