Hounsfield unit
Updates to Article Attributes
The Hounsfield unit(HU) is a quantity commonly used incomputed tomography (CT)scanning to express CT CT numbersin a standardised and convenient form. Hounsfield units, created by and named afterSir Godfrey Hounsfield, are obtained from a linear linear transformation of the measuredattenuation coefficients 1. This transformation (figure 1) is based on the arbitrary definitions of air and water:
- radiodensity of distilled water at standard temperature and pressure (STP) = 0 HU
- radiodensity of air at STP = -1000 HU
Hounsfield units are measured and reported in a variety of clinical applications. One well known use is the evaluation of the the fat content of the liver, with fatty liver diagnosed by the the presence of a liver-to-spleen ratio less than 1 1.0 or 0.82. Other less common uses include uses include assessing bone mineral density (BMD) 3, predicting the presence of anemia 4, and guiding the management of kidney stones 5.
-<p>The <strong>Hounsfield unit (HU) </strong>is a quantity commonly used in <a href="/articles/computed-tomography">computed tomography (CT)</a><strong> </strong>scanning to express CT numbers<strong> </strong>in a standardised and convenient form. Hounsfield units, created by and named after <a href="/articles/godfrey-hounsfield">Sir Godfrey Hounsfield</a>, are obtained from a linear transformation of the measured <a href="/articles/attenuation-coefficient">attenuation coefficients</a> <sup>1</sup>. This transformation (figure 1) is based on the arbitrary definitions of air and water:</p><ul>- +<p>The <strong>Hounsfield unit (HU) </strong>is a quantity commonly used in <a href="/articles/computed-tomography">computed tomography (CT)</a><strong> </strong>scanning to express CT numbers<strong> </strong>in a standardised and convenient form. Hounsfield units, created by and named after <a href="/articles/godfrey-hounsfield">Sir Godfrey Hounsfield</a>, are obtained from a linear transformation of the measured <a href="/articles/attenuation-coefficient">attenuation coefficients</a> <sup>1</sup>. This transformation (figure 1) is based on the arbitrary definitions of air and water:</p><ul>
-</ul><p>Hounsfield units are measured and reported in a variety of clinical applications. One well known use is the evaluation of the fat content of the liver, with fatty liver diagnosed by the presence of a liver-to-spleen ratio less than 1.0 or 0.8 <sup>2</sup>. Other less common uses include assessing <a href="/articles/bone-mineral-density">bone mineral density</a> (BMD) <sup>3</sup>, predicting the presence of anemia <sup>4</sup>, and guiding the management of <a href="/articles/urolithiasis">kidney stones</a> <sup>5</sup>.</p>- +</ul><p>Hounsfield units are measured and reported in a variety of clinical applications. One well known use is the evaluation of the fat content of the liver, with fatty liver diagnosed by the presence of a liver-to-spleen ratio less than 1.0 or 0.8 <sup>2</sup>. Other less common uses include assessing <a href="/articles/bone-mineral-density">bone mineral density</a> (BMD) <sup>3</sup>, predicting the presence of anemia <sup>4</sup>, and guiding the management of <a href="/articles/urolithiasis">kidney stones</a> <sup>5</sup>.</p>
References changed:
- 6. Thomas AMK, Banerjee AK, Busch U. Classic Papers in Modern Diagnostic Radiology. (2004) <a href="https://books.google.co.uk/books?vid=ISBN9783540219279">ISBN: 9783540219279</a><span class="ref_v4"></span>
Unable to process the form. Check for errors and try again.