nes</span>
scan_lines = bsxfun(@times, tgc, scan_lines);
</pre>

<p></p>
<p><b>3. Frequency Filtering</b></p>
<p>The scan lines are then filtered using a Gaussian filter centered about the transmit frequency or the second harmonic. This reduces the effects of noise outside the transmit frequency range, or in the latter case, obtains the harmonic signal for tissue harmonic imaging. The filtering is performed using <code><a href="gaussianFilter.html">gaussianFilter</a></code> by specifying the required filter