From ALOKA Co., Ltd.;
'Innovative Image Quality in a Compact Size
Featuring design concepts inherited from our higher end systems along with Aloka's latest proprietary electronic technologies, the compact SSD-900V delivers superb images.
Traditionally, portable units suffer from hardware and software limitations that affect image quality. Aloka's SSD-900V sets new standards for what's possible in a portable unit. Incorporating over 50 years of experience and unique micro-chip technologies, the SSD-900V generates incredibly high-resolution images.
The SSD-900V offers a full range of measurement functions for professional ultrasonic examination. And unlike conventional portable systems, the SSD-900V includes annotation labeling and 15-channel preset functions as standard features.
The system also use Super High Density transducers (found our high-end systems) to enhance imaging resolution. These multi-frequency transducers provide a broad range of imaging frequencies to optimize scan frequency for depth of view.'

The acoustic window or field is the area defined by the pathway of the ultrasound beam between the transducer and the acoustic reflector. The sound reflection to skin boundary should be minimized with an ultrasound gel where this gel acts as an acoustic window through which the image is seen.
Acoustic window refers also to the optimal placing of the transducers so that the areas of interest are clearly imaged.

See also Transforaminal Window, Transcranial Window, Transorbital Window and Transtemporal Window.

Arrays are spatial arrangements of transducers or transducer elements.
Array types used in ultrasound imaging:
See also Composite Array.

From Ultralink LLC;
'Artemis is a very high frequency (VHF) ultrasound eye scanner. In use, the patient leans forward placing their head onto an adjustable headrest. The headrest's unique design permits the patient to pull away quickly from the scanner if desired. An eyecup filled with a saline-based interface fluid couples the ultrasound signal to the eye, while a precision mechanism moves the transducer past the front of the eye. During the accurately controlled arc motion of the transducer, which lasts less than one second, many thousands of ultrasound samples are digitized. Following a scan, signal analysis is performed on a PC-compatible microcomputer, and the data are available for immediate viewing on an LCD monitor or disk storage. Artemis is very flexible; many adjustments to the scanning parameters are possible to customize the scan to your clinical needs. Functions are provided for centering the scan about the optical axis of the eye. The starting location of the scans as well as the extent can be varied as desired, to view image planes through the eye at different angles.'

See also Ultrasound Biomicroscopy, A-Mode and A-Scan.

Beam steering is a method of steering the main lobe of a transducer to a certain direction. Array transducers have the ability to be steered as well as focused. Like focusing, the beam is directed by sequentially stimulation of each element. This feature creates the sector scan by rapidly steering the beam from left to right to give the two dimensional cross sectional image.