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Temporal Resolution

  • Temporal Resolution
    • The ability of a CT scanner to produce a motion free image. Temporal resolution has become increasingly more important with the utilization of CT Cardiac studies.
      • There are two primary ways in which the temporal resolution of a CT scanner can be impacted. The speed in which the gantry rotates and the use of half-scan or multi-segment reconstruction both directly impact the temporal resolution of a CT scanner.
        • Half-scan reconstruction consists of a reconstruction of data that was obtained from only a half of a gantry rotation. Utilization of this method allows for the scan time to be cut in half, and improves temporal resolution.
        • Multi-segment reconstruction consists of a reconstruction of data that was obtained at more than one point in time. The multiple image segments are reconstructed into one data set.
          • This method is most often used during CT Cardiac exams where it is common to use two or more segment reconstructions. In this instance, data that is obtained in two or more consecutive heartbeats is reconstructed to make one image.