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Temporal resolution

Temporal resolution relates to the duration of time for acquisition of a single frame of a dynamic process, i.e., cine imaging.

Discussion

The concept of temporal resolution is fundamental to cardiac CT and MRI, in which a rapidly beating heart is imaged over the order of milliseconds into multiple frame-captures. In MRI, the time gap between consecutive images indicates the temporal resolution which is given by the formula:

VPS.TR

where

  • VPS = views per segment - a user-defined variable and
  • TR = time to repetition.

So, for example if the TR is 10ms and there are 5 views per segment, the temporal resolution would be 50ms.

In cardiac CT, a temporal resolution of 250ms means that a single image is acquired over 250 ms of  the cardiac cycle, i.e., 4 images during a single cycle at a heart-rate of 60/minute. With modern dual-phase CT scanners, temporal resolutions as low as 42ms have become possible, enabling better evaluation of regional wall motion.

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