From SIUI Inc.;
'The CTS-385 Plus is designed for the diagnosis of liver, gallbladder, kidney, pancreas, thyroid, breast, uterus, bladder, ovary, etc. The system is a portable linear and convex unit for general application.'
Features:
'High quality image
Cineloop − 32-frame non-volatile storage capacity
Probe frequency conversation option
Computer image communication
Various measuring function
Foldaway keyboard for easy operation
Dual probe connector'

From SIUI Inc.;
'SIUI's newly developed CTS-485 is a portable ultrasound system with advanced technology. With its powerful features, such as 256 grayscale, cineloop, RS232C interface and broadband high-density, multi-frequency probes, the system is designed for professional applications in cardiology, abdominal, small parts, liver, gallbladder, kidney, obstetrics, gynecology, peripheral vascular, etc. The CTS-485 has passed FDA clearance and CE Marking.'

From SIUI Inc.;
'A breakthrough in traditional designation
The latest technologies and processes
Closely combined with up-to-date IT technology
A variety of advanced ultrasound imaging technologies
The best solution provided for users'

'CTS-5000 can match a variety of super high density, super broadband, multi-frequency probes, including convex, micro-convex, linear, vaginal, rectal probes etc., which are widely used to different clinical diagnosis such as abdominal (liver, kidney, gall-bladder, pancreas), gynecology (uterus, ovary), obstetrics (early pregnancy, basic obstetrics, multi gestation, fetal echo), cardiology (adult and pediatric cardiology), small parts (thyroid, galactophore, testicles), peripheral vascular, prostate.'

Christian Johann Doppler first described the effect of motion of sound sources and the frequency change of the sound to the observer.
Doppler ultrasound uses this effect to detect and measure blood flow, and the major reflector is the red blood cell. Doppler ultrasound depends on the fact that if the reflecting surface is moving in relation to the transducer (blood flowing in a vessel) the frequency of the received ultrasound wave will be different from that of the transmitted wave. If blood cells are moving towards the transducer, they increase the frequency of the returning signal. As cells move away from the transducer, the frequency of the returning signal decreases.

See also Quadrature Detection and Doppler Techniques.

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: