Mach bands
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The Mach bands or the Mach effect refers to an optical phenomenon from edge enhancement due to lateral inhibition of the retina 2. This is an inbuilt edge enhancement mechanism of the of the retina, where the edges of darker objects next to lighter objects will appear lighter and vice versa; creating a false shadow 4.
This has been attributed as a source of diagnostic error in radiology:
- a dark halo around a dense breast lesion in mammography 3
. - apparent pneumomediastinum - the so-called pseudopneumomediastinum
, - mimic a fracture
Knowledge of the phenomenon may lead to a false interpretation of a true radiological sign as Mach bands.
History
Named after the Austrian physicist Ernst Waldfried Josef Wenzel Mach (1838-1916) who first described it in 1865.
-<p>The <strong>Mach bands</strong> effect refers to an optical phenomenon from edge enhancement due to lateral inhibition of the retina <sup>2</sup>. This is inbuilt edge enhancement mechanism of the of the retina, where the edges of darker objects next to lighter objects will appear lighter and vice versa; creating a false shadow <sup>4</sup>. </p><p>This has been attributed as a source of diagnostic error in radiology:</p><ul>-<li>a dark halo around a dense breast lesion in mammography <sup>3</sup>. </li>-<li>apparent <a href="/articles/pneumomediastinum">pneumomediastinum</a> - the so-called <a href="/articles/pseudopneumomediastinum">pseudopneumomediastinum</a>,</li>- +<p><strong>Mach bands</strong> or the <strong>Mach effect</strong> refers to an optical phenomenon from edge enhancement due to lateral inhibition of the retina <sup>2</sup>. This is an inbuilt edge enhancement mechanism of the retina, where the edges of darker objects next to lighter objects will appear lighter and vice versa; creating a false shadow <sup>4</sup>. </p><p>This has been attributed as a source of diagnostic error in radiology:</p><ul>
- +<li>a dark halo around a dense breast lesion in mammography <sup>3</sup>
- +</li>
- +<li>apparent <a href="/articles/pneumomediastinum">pneumomediastinum</a> - the so-called <a href="/articles/pseudopneumomediastinum">pseudopneumomediastinum</a>
- +</li>
- +<li>mimic a fracture</li>
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