Acquisition time

Last revised by Andrew Murphy on 2 Apr 2020

Citation, DOI, disclosures and article data

Citation:

Ballinger J, Murphy A, Bell D, et al. Acquisition time. Reference article, Radiopaedia.org (Accessed on 03 Dec 2023) https://doi.org/10.53347/rID-22553

DOI:

https://doi.org/10.53347/rID-22553

Permalink:

https://radiopaedia.org/articles/22553

rID:

22553

Article created:

7 Apr 2013, J. Ray Ballinger

Disclosures:

At the time the article was created J. Ray Ballinger had no recorded disclosures.

View J. Ray Ballinger's current disclosures

Last revised:

2 Apr 2020, Andrew Murphy ◉

Disclosures:

At the time the article was last revised Andrew Murphy had no recorded disclosures.

View Andrew Murphy's current disclosures

Revisions:

7 times, by 7 contributors - see full revision history and disclosures

Sections:

Imaging Technology

Tags:

mri image quality, refs, stub

Synonyms:

Time of acquisition for a conventional spin echo or gradient echo sequence
Time of acquisition
Acquisition times

The time of acquisition for a conventional spin echo or gradient echo sequence is the product of the repetition time, phase encoding steps, and number of averages (TR x phase steps x NEX). For example, with a one second TR, 128 phase steps, and two averages we would get an acquisition time of about 1 x 128 x 2 = 256 seconds or 4 minutes and 16 seconds. The actual time will be slightly longer.

Fast spin echo and fast gradient echo sequences perform more than one phase encoding step per repetition time, resulting in reduced acquisition time by the number of phase step per repetition time.

Needs more on other sequences