ultrasonography

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Related to A-scan: ophthalmic biometry
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Synonyms for ultrasonography

using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram)

References in periodicals archive ?
Due to the limitations outlined above for ultrasound-based methods, other AL measurement techniques based upon optical principles have predominantly superseded use of A-scans in the myopia research field.
The frequency domain image is one of several images made by transforming the A-scans.
In comparison with the existing Pundit Lab(+), the Pundit PL-200 provides an extended range of measurement modes and superior features for on-site testing: Assessing the concrete uniformity using standard A-Scans and the new Line Scan functionality, estimating the compressive strength of concrete or measuring the surface velocity and the depth of perpendicular cracks.
The A-Scan used to measure the anterior chamber depth, lens thickness, vitreous chamber length, and axial length, was the Alcon ultrasonic scan using a frequency of 10 MHz.
This phenomenon is displayed on A-scan, as high reflectivity with strong sound attenuation.
The strength of the reflected signals is plotted as a waveform called an A-scan (A stands for "amplitude").
An oscilloscope display of the echo pattern, known as an A-Scan, shows defects as areas of higher contrast in the image.
Material has been added on exophthalmometry and A-scan biometry.
For example, the latest precision thickness gauge offers a snapshot A-scan display as well as a digital display.
This feature can be browsed or searched to learn more about tests ranging from the A-scan, used to determine the length of the eye, to the Zung Self-Rating Depression Scale (SDS).
In an A-scan presentation, the initial sound pulse and the resulting rear wall or discontinuity reflections are displayed on a cathode ray tube (CRT).
RadarView receives, processes and scan converts multiple channels of radar video in normal PPI (plan position indicator) view, and, for more specialist requirements, supports B-Scan and A-Scan formats - the latter is especially useful for radar configuration and set-up.
Contract awarded for 1) 4398n001-digital ultrasonic flaw detector machine with a-scan storage with complete std accessories as per rdso specification no.
Although conventional A-scan ultrasonography is the gold standard method for measuring ACD, noncontact methods and devices such as partial coherence interferometry, slit-scanning topography, anterior segment optical coherence tomography and Scheimpflug imaging have become widely used in clinics in recent years.