For the flowprobe a vessel is positioned between transducers which generate wide beams of ultrasound to fully illuminate the vessel. The ultrasound beams alternately intersect the flowing blood in upstream and downstream directions. The flowmeter derives an accurate measure of the changes in transit time influenced by the motion of the blood.

See also Bi-directional Flow.

Bubble specific imaging methods rely usually on non-linear imaging modes. These contrast imaging techniques are designed to suppress the echo from tissue in relation to that from a microbubble contrast agent.
Stimulated acoustic emission (SAE) and phase / pulse inversion imaging mode (PIM) are bubble specific modes, which can image the tissue specific phase.
In SAE mode bubble rupture is seen as a transient bright signal in B-mode and as a characteristic mosaic-like effect in velocity 2D color Doppler.
PIM are Doppler modes and detect non-linear echoes from microbubbles. In pulse inversion imaging modes the transducer bandwidth extends, resulting in improved spatial resolution and more contrast.

See also Contrast Pulse Sequencing, Microbubble Scanner Modification, Narrow Bandwidth, Contrast Medium, Dead Zone.

From SIUI Inc.;
'The SIUI CTS-200 is one of few 'linear only' units to be developed with a digital scan converter to process all incoming signals. With a digital processor, not only is the incoming signal processed faster but less noise is introduced into the signal path. The images are cleaner, crisper than you have experienced, even in machines at many times the price.'
'CTS-200 is suitable to a wide range of examination of liver, gallbladder, kidney, spleen, pancreas, thyroid gland, breast, uterus, urinary bladder, OB/GYN, etc. It is a portable ultrasound scanner of high performance.'

From SIUI Inc.;
'The CTS-285 is designed for the diagnosis of liver, gallbladder, kidney, pancreas, thyroid, breast, uterus, bladder, ovary, etc. It is a portable versatile ultrasound scanner with convex and linear array scanning.'

From SIUI Inc.;
'The CTS-310B is designed for the diagnosis of liver, gall, kidney, pancreas, thyroid, breast, uterus, bladder, ovary, etc. It is a versatile ultrasound scanner with both linear array scanning and convex scanning.'
Features:
'Powerful image processing circuit & High quality image
A wide range of probes for selection
Cineloop
Probe frequency conversation option
Computer image communication
Various measuring function
Backlit keyboard'