With a wider vessel, the Doppler shift is broadened since there will now be blood cells travelling at {HEAD ~ different velocities} across the diameter of {TAIL ~ the vessel} 
With a wider vessel , the Doppler shift is broadened since there will now be blood cells travelling at { HEAD ~ different velocities } across the diameter of { TAIL ~ the vessel }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL