When evaluating probes during a PM, how many bad elements are OK before it starts affecting Doppler readings?

Dead elements on the probe will reduce the quality of Doppler information. When you move the color box over an area with weak/dead elements, you see degradation in the Color Doppler quality. These effects are more visible on a linear probe versus a phased array one. A couple of weak elements on the edges of a probe might not warrant an immediate replacement. Such probes should be monitored and replaced as soon as the weak elements turn into dead ones.

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