Critical angle (ultrasound)
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- updated 24 May 2024:
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The critical angle (θc) describes a refractive phenomenon in ultrasonography describes the incidence, whereby a specific incident angle of the sound beam which createswill result in 'total reflection' 1. In this situation, the transmitted sound beam, will run parallel to the boundary of the second tissue without penetrating it 1. This phenomenon will only occur when the sound beam is travelling from a material with low propagation speed to a material with higher propagation speed (i.e. c2 > c1) 1.
The critical angle may be calculated by substituting the transmitted angle for 90 degrees in Snell's Law, thereby simplifying the equation to sin θc = c1/c2 1.
-<p>The <strong>critical angle</strong> (θ<sub>c</sub>) in ultrasonography describes the incidence angle of the sound beam which creates 'total reflection' <sup>1</sup>. In this situation, the transmitted sound beam, will run parallel to the boundary of the second tissue without penetrating it <sup>1</sup>. </p><p>The critical angle may be calculated by substituting the transmitted angle for 90 degrees in <a href="/articles/refraction" title="Refraction">Snell's Law</a>, thereby simplifying the equation to sin θ<sub>c </sub>= c<sub>1</sub>/c<sub>2 </sub><sup>1</sup>.</p>- +<p>The <strong>critical angle</strong> (θ<sub>c</sub>) describes a <a href="/articles/refraction" title="Refraction">refractive</a> phenomenon in ultrasonography, whereby a specific incident angle of the sound beam will result in 'total reflection' <sup>1</sup>. In this situation, the transmitted sound beam, will run parallel to the boundary of the second tissue without penetrating it <sup>1</sup>. This phenomenon will only occur when the sound beam is travelling from a material with low propagation speed to a material with higher propagation speed (i.e. c<sub>2</sub> > c<sub>1</sub>) <sup>1</sup>.</p><p>The critical angle may be calculated by substituting the transmitted angle for 90 degrees in <a href="/articles/refraction" title="Refraction">Snell's Law</a>, thereby simplifying the equation to sin θ<sub>c </sub>= c<sub>1</sub>/c<sub>2 </sub><sup>1</sup>.</p>
Sections changed:
- Imaging Technology
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