Temporal resolution relates to the duration of time for acquisition of a single frame of a dynamic process, i.e., cine imaging.
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 = 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.
- 1. Brodoefel H, Kramer U, Reimann A et-al. Dual-source CT with improved temporal resolution in assessment of left ventricular function: a pilot study. AJR Am J Roentgenol. 2007;189 (5): 1064-70. doi:10.2214/AJR.07.2228 - Pubmed citation
- 2. Slavin GS, Bluemke DA. Spatial and temporal resolution in cardiovascular MR imaging: review and recommendations. Radiology. 2005;234 (2): 330-8. doi:10.1148/radiol.2342031990 - Pubmed citation
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