Pressure gradient:PressDiff:Pt:Region of interest.XXX:Qn:US.doppler
pressure gradient:pressdiff:pt:region of interest.xxx:qn:us.doppler
Pressure gradient:Difference:To identify measures at a point in time:Region of interest.Not specified:Quantitative:Ultrasound.doppler
pressure gradient:difference:to identify measures at a point in time:region of interest.not specified:quantitative:ultrasound.doppler