(PD) Power Doppler imaging (PDI) is a Doppler technique, sensitive to low blood flow, allowing a complete visualization of detailed vascular blood structure. This medical imaging method is useable for detecting microbubbles during myocardial contrast echocardiography.

See also Resistive Index.

Reflux is the backward flow of fluids. For example, reflux of blood with proximal limb compression is an indicator of venous valvular incompetence.

See also Reflux Sonography.

(RI) The resistive index is a measure of resistance to arterial flow and is calculated from the power Doppler arterial waveform.
The equation of this index is:
RI = (peak systolic velocity - end diastolic velocity) : peak systolic velocity

The resolution is the ability to distinguish two adjacent objects or in Doppler measurements the smallest detectable change in flow. Probe resolutions are generally specified at 0.1Hz filtering.

See also Matrix Size.

From Siemens Medical Systems;
'The Antares™ system was built on four foundations that mark the beginning of a new paradigm in ultrasound imaging: Diagnostic Precision, DIMAQ-IP, ErgoDynamic™ imaging system design, and Workflow Control.'

Specifications for this system will be available soon.