Loading...
 
PDF Print

M-mode

Several subsequent A-scans are performed with a time interval $\Delta t , but the individual A-scans are not plotted as curves, but by using colour codes: the higher the value of R is, the lighter patch corresponds to it. The values of the k-th A-scan are placed in the k-th column. This technique can be applied to observe the heart valves, for example.

Image
Figure 3.

 

Image
Figure 4. M-mode image. The movement of the mitral valve is clearly visible.

 
When choosing the value of $\Delta t, it is important to consider the maximal depth z_{max} of the examinable area: the next A-scan cannot be performed until the echo of the previously emitted signal arrives from the maximal depth. Therefore, \Delta t \geq 2z_{max}/c .


Site Language: English

Log in as…