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.

Share article

Article Information

rID: 16899
Section: Physics
Synonyms or Alternate Spellings:
  • Temporal resolution on MRI

Support Radiopaedia and see fewer ads

Updating… Please wait.
Loadinganimation

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.