Methods to Reduce or Eliminate Partial Scan Artifacts in Cardiac CT (original) (raw)

Abstract

PURPOSE Partial (180°+fan angle) scan reconstructions improve temporal resolution but cause large CT number variations. This work sought to determine the magnitude of partial scan artifacts and develop methods to reduce or eliminate the resultant CT number variations. METHOD AND MATERIALS An anthropomorphic cardiac phantom was scanned on a dual-source CT (DSCT) scanner (Siemens Definition). Both cardiac perfusion (zero table feed) and cardiac spiral modes were used, with either one or both x-ray tubes. Additional data were acquired using a novel approach where the ECG-signal was synchronized with the x-ray tube angular position. The central portion of the phantom was replaced with a water tank containing a syringe with different iodine solutions. Images were reconstructed at four temporal resolutions (330, 248, 165, and 83 ms) corresponding to four levels of data symmetry (full, 3/4, half, and 1/4 gantry rotation, respectively). Four circular ROIs were placed symmetrically outside t...

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