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  Indian J Med Microbiol
 

Figure 4: Right kidney with a stone having twinkling artifact evaluated with 5.5 KHz (19.2 cm/s) and 7.5 KHz (131.0 cm/s), while keeping all the other machine settings the same. In the right image with low pulse repetition frequency (scale) the twinkling is superimposed by colors from the blood flow. On the left side image with high pulse repetition frequency (scale) shows only twinkling from the stone but the low Doppler shift blood flow is subtracted

Figure 4: Right kidney with a stone having twinkling artifact evaluated with 5.5 KHz (19.2 cm/s) and 7.5 KHz (131.0 cm/s), while keeping all the other machine settings the same. In the right image with low pulse repetition frequency (scale) the twinkling is superimposed by colors from the blood flow. On the left side image with high pulse repetition frequency (scale) shows only twinkling from the stone but the low Doppler shift blood flow is subtracted