Resistive index (vascular ultrasound)

Changed by Craig Hacking, 29 May 2020

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~~Resistivity~~Resistive index (vascular ultrasound)

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The resistive index is a calculated flow parameter in ultrasound, derived from the maximum, minimum, and mean Doppler frequency shifts during a defined cardiac cycle. Along with the pulsatility index (PI), it is typically used to assess the resistance in a vascular system.

Terminology

TBA

Clinical use

delta RI

-<p>The <strong>resistive index</strong> is a calculated flow parameter in <strong>ultrasound</strong>, derived from the maximum, minimum, and mean Doppler frequency shifts during a defined cardiac cycle. Along with the <a title="Pulsatility index (ultrasound)" href="/articles/pulsatility-index-ultrasound">pulsatility index (PI)</a>, it is typically used to assess the resistance in a vascular system.</p><h4>Terminology</h4><p>TBA</p><h4>Clinical use</h4><ul>
~~-<li><a title="Hepatic arterial resistive index" href="/articles/hepatic-arterial-resistive-index">hepatic RI</a></li>~~
~~-<li><a title="Renal arterial resistive index" href="/articles/renal-arterial-resistive-index">renal RI</a></li>~~
+<p>The <strong>resistive index</strong> is a calculated flow parameter in <strong>ultrasound</strong>, derived from the maximum, minimum, and mean Doppler frequency shifts during a defined cardiac cycle. Along with the <a href="/articles/pulsatility-index-ultrasound">pulsatility index (PI)</a>, it is typically used to assess the resistance in a vascular system.</p><h4>Terminology</h4><p>TBA</p><h4>Clinical use</h4><ul>
+<li><a href="/articles/hepatic-arterial-resistive-index">hepatic RI</a></li>
+<li><a href="/articles/renal-arterial-resistive-index">renal RI</a></li>
+<li><a href="/articles/delta-resistive-index">delta RI</a></li>

References changed:

1. Boote E. AAPM/RSNA Physics Tutorial for Residents: Topics in US: Doppler US Techniques: Concepts of Blood Flow Detection and Flow Dynamics. Radiographics. 2003;23(5):1315-27. <a href="https://doi.org/10.1148/rg.235035080">doi:10.1148/rg.235035080</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/12975518">Pubmed</a>

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