This format is rectangular and has the same width in the nearfield and the farfield. The image is made with an electronic array where only one part of the probe is used for each beam. The active part of the probe is moved by switching to produce the next beam, and so on. This format is used for shallow imaging, i.e. at high frequencies. It is especially used when imaging peripheral vessels at 5 to 10 MHz (see figure 14). 
<p>
<img src="/elaring/fag/ultralyd/teknologi/figur14.jpg" height="300">
<br> 
Figure 14: Linear scan. Left side shows the scanning situation where a probe is placed over the carotid artery, and the right side shows the resulting ultrasound image. 
<p>
To get a good Doppler spectrum and good color Doppler, the beam must be angled relative to the blood flow. The beam must therefore be angled between 10-30° as shown in figure 15. 
<p>
<img src="/elaring/fag/ultralyd/teknologi/figur15.jpg" height="300">
<br>
Figure 15: Linear scan with an angled beam for use in Doppler imaging.