Carotid stenosis assessed with a 4-dimensional semiautomated Doppler system.

Objective: The purpose of this study was to compare peak systolic velocities (PSVs) and the degree of stenosis obtained with a real-time 3-dimensional (ie, 4-dimensional) Doppler ultrasound scanner (Encore PV; VueSonix Sensors Inc, Wayne, PA) to conventional Doppler ultrasound imaging of the carotid arteries (common [CCA], internal [ICA], and external [ECA]). A secondary goal was to assess Encore volume flow measurements.

Methods: Seventy patients referred for clinical carotid ultrasound participated in this pilot study.

In vivo perfusion estimation using subharmonic contrast microbubble signals.

Objective: The purpose of this study was to quantify perfusion in vivo using contrast-enhanced subharmonic imaging (SHI).

Methods: A modified LOGIQ 9 scanner (GE Healthcare, Milwaukee, WI) operating in gray scale SHI mode was used to measure SHI time-intensity curves in vivo. Four dogs received intravenous contrast bolus injections (dose, 0.