Harmonic imaging
Updates to Article Attributes
Harmonic imaging is a technique in ultrasonography that provides images of better quality as compared with conventional ultrasound technique.
Physics
Harmonic imaging exploits exploits non-linear propagation of ultrasound through the body tissues. The high pressure-pressure portion of the wave travels faster than low pressure resulting in distortion of the shape of the wave. This change in waveform leads to the generation of harmonics (multiples of the fundamental or transmitted frequency) from a tissue. At present, 2nd harmonic is being used to produce the image as the subsequent harmonics are of decreasing amplitude and hence insufficient to generate a proper image.
These harmonic waves that are generated within the tissue, increase with depth to athe point of maximum intensity and then decrease with further depth due to attenuation. Hence the maximum intensity is achieved at an optimum depth below the surface.
Advantages over conventional ultrasound
- decreased reverberation and side lobe artifacts
- increased axial and lateral resolution
- cyst
clearingclearing - increased signal to noise ratio
- improved resolution in patients with large body habitus
-<p><strong>Harmonic imaging</strong> is a technique in ultrasonography that provides images of better quality as compared with conventional ultrasound technique.</p><h4>Physics</h4><p>Harmonic imaging exploits non-linear propagation of ultrasound through the body tissues. The high pressure portion of the wave travels faster than low pressure resulting in distortion of the shape of the wave. This change in waveform leads to generation of harmonics (multiples of the fundamental or transmitted frequency) from tissue. At present, 2<sup>nd</sup> harmonic is being used to produce the image as the subsequent harmonics are of decreasing amplitude and hence insufficient to generate a proper image. </p><p>These harmonic waves that are generated within the tissue, increase with depth to a point of maximum intensity and then decrease with further depth due to attenuation. Hence the maximum intensity is achieved at an optimum depth below the surface. </p><h5>Advantages over conventional ultrasound</h5><ul>-<li>decreased <a href="/articles/reverberation-artifact">reverberation</a> and <a href="/articles/side-lobe-artifact">side lobe artifacts</a>- +<p><strong>Harmonic imaging</strong> is a technique in ultrasonography that provides images of better quality as compared with conventional ultrasound technique.</p><h4>Physics</h4><p>Harmonic imaging exploits non-linear propagation of ultrasound through the body tissues. The high-pressure portion of the wave travels faster than low pressure resulting in distortion of the shape of the wave. This change in waveform leads to the generation of harmonics (multiples of the fundamental or transmitted frequency) from a tissue. At present, 2<sup>nd</sup> harmonic is being used to produce the image as the subsequent harmonics are of decreasing amplitude and hence insufficient to generate a proper image. </p><p>These harmonic waves that are generated within the tissue, increase with depth to the point of maximum intensity and then decrease with further depth due to attenuation. Hence the maximum intensity is achieved at an optimum depth below the surface. </p><h5>Advantages over conventional ultrasound</h5><ul>
- +<li>decreased <a href="/articles/reverberation-artifact">reverberation</a> and <a href="/articles/side-lobe-artifact-2">side lobe artifacts</a>
-<li>cyst clearing</li>- +<li>cyst clearing</li>
Unable to process the form. Check for errors and try again.