From CHISON MEDICAL IMAGING CO., LTD.;
Portable S/W convex and linear scanner, less than 7 kg.

From CHISON MEDICAL IMAGING CO., LTD.;
Vet scanner for abdominal, reproduction, small parts, urology, cardiology, and tendon of dogs, cats, equine etc.

From CHISON MEDICAL IMAGING CO., LTD.;
Convex and linear scanner for abdominal, Obs/Gyn, small parts, urology, cardiology, proctology and pediatrics.

From CHISON MEDICAL IMAGING CO., LTD.;
PC-based scanner for abdominal, Obs/Gyn, small parts, urology, cardiology, proctology, pediatrics with four 4-step multi-frequency probes.

Doppler ultrasound is a medical imaging technique for calculating the relative velocity between two points by measuring the frequency shift of a sound wave transmitted from one point to the other, based on the Doppler effect. Continuous or pulsed Doppler is frequently used to examine cardiovascular blood flow. The combination of routine 2D-mode and Doppler ultrasound allows a complete evaluation of the heart's anatomy and function (including the fetal heart). See also Doppler Fluximetry in Pregnancy.
Doppler ultrasound depends on the fact that if a moving object reflects the ultrasound waves, the echo frequencies are changed. A higher frequency is created if the object is moving toward the probe//transducer and a lower frequency if it is moving away from it. How much the frequency is changed depends upon how fast the object is moving. Doppler ultrasound shows the different rates of blood flow in different colors on a monitor in real time.
The major Doppler parameters are the peak systolic velocity and the end-diastolic velocity. The peak systolic velocity ratio compensates the variability between different patients and instrumentations.

Different Doppler and duplex techniques: