Retrolenticular afterglow could occur through diffraction and refraction on interfaces. A circular object may act as a lens to the ultrasound beam, showing an artifact region of increased echogenicity.

From Medison Co.,Ltd.;
'The SONOACE 9900 offers exceptional B/W image clarity by newly developed FINE™ Filter technology, which contributes to edge enhancement and average filtering in real-time. OSIO™(Organ Specified Image Optimization)sets the best diagnosis environment with minimum manual operation and increases patient throughput. Also, color images are improved with better color Doppler performance, high color sensitivity, fine pixel image, and reduced flash artifact across all probes.'

'The SONOACE 9900 PRIME from Medison offers full range of applications specially designed for your practice. With the addition of the new C-Square Processing and PSAD Beamformer, SONOACE 9900 PRIME provides higher contrast resolution and clearer image quality in all application ranges. Based on super clear image resolution and versatile 3D functions, SONOACE 9900 PRIME offers you the true value of future ultrasound technology.'

Side lobes are secondary and smaller acoustic beams falling outside at predictable angles located around the main lobe.

See also Grating-lobe Artifact, Amplitude Shading, and Apodization.

From Kontron Medical SAS;
'The Sigma 330 is a versatile, digital, mobile Ultrasound System, upgradeable from 2D to Doppler, Color Flow Mapping and 3D.
The Sigma 330 displays excellent image quality and superb Doppler and CFM sensitivity, employing ATEC™ (Advanced Tissue Echo Cancellation), a revolutionary technology developed by the Kontron Medical R&D Center, which removes tissue artifacts ('ghosting').'

Specifications for this system will be available soon.

Speckle noise affects the quality of the ultrasound images and can mask pathology. This artifact can be reduced by using a phase insensitive technique, or by canceling the undesirable linear-phase representation. More system samplings (needs more channels and memory) or a fuzzy logic algorithm can filter out the speckle noise.