Acquisition time
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- updated 16 Jan 2024:
- Integral Diagnostics, Shareholder (ongoing)
- Micro-X Ltd, Shareholder (ongoing)
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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-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 reducedreducing acquisition time by the number of phase stepsteps per repetition time.
Needs more on other sequences
-<p>The <strong>time of acquisition</strong> 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. </p><p>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.</p><p><em>Needs more on other sequences</em></p>- +<p>The <strong>time of acquisition</strong> for a conventional <a href="/articles/spin-echo-sequences" title="Spin echo sequences">spin echo</a> or <a href="/articles/gradient-echo-sequences-1" title="Gradient echo sequences">gradient echo sequence</a> is the product of the <a href="/articles/repetition-time" title="Repetition time">repetition time</a>, phase encoding steps, and number of averages (TR x phase steps x NEX). </p><p>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. </p><p><a href="/articles/fast-spin-echo" title="Fast spin echo">Fast spin echo</a> and fast gradient echo sequences perform more than one phase encoding step per repetition time, reducing acquisition time by the number of phase steps per repetition time.</p>
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