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 ?
Because of the unavailability of certain clinical equipment, ocular biometry measurements (ACD) were performed using contact A-scan ultrasonography, and ICA was evaluated by Goldmann 3-mirror lens in our study.
Faster systems that extend into the megahertz range for the A-scan rates are then more interesting for real-time 3D applications.
A-scan of the inspection from the steel side using 3.5 MHz phased array transducer.
In addition, the requirement for corneal anaesthesia and the dependence on operator expertise to achieve axial alignment of the transducer, reduce the suitability of A-scan for assessing AL changes associated with myopia progression in children.
Keratometry was done on Haag-Strait manual keratometer and A-scan was done by applanation contact method on SonoMed machine.
PEC testing technique also allows to measure the time-dependent response signal (A-scan response) and to analyze the response at different time points after pulse shut-off in order to gain information on the depth [23].
These received waves are then converted into a voltage wave, which is called a trace (a-scan), as shown in Figure 1.
Cygnus says while the Cygnus 4+ has been specifically designed to be easy to operate, it does have an excellent array of key features including: versatile measuring modes and an A-scan display.
Slit-lamp examination, transillumination, digital photography, A-scan ultrasonography, B-scan ultrasonography (USB), ultrasonic biomicroscopy (UBM), fluorescein and indocyanine green angiography, and anterior segment optical coherence tomography (AS-OCT) are methods utilized in diagnosis.
The simulation result of the model (a) was calculated by 2D-FDTD, shown as both the A-Scan and B-Scan in Figure 4.
Fourteen eyes from seven clinically normal cats were examined for intraocular distances (using A-scan ultrasound biometry) and corneal curvature (using keratometry) and by using these data appropriate posterior chamber IOL strength to achieve emmetropia after lens removal has been predicted.
In the present study 50 patients (50 eyes) with equal number of cases and controls are evaluated with detailed history, ocular examination and biometric data was taken from both the groups using A-scan ultrasonography.
Among the topics are color vision and color blindness, slit-lamp examination, corneal confocal microscopy, optic disc assessment in glaucoma, indocyanine green angiography, A-scan and B-scan ultrasonography, electrophysical tests for assessing visual function, anterior segment optical coherence tomography, localizing an intra-ocular foreign body, diagnostic procedures for genetically transmitted eye diseases, diagnostic modalities in intra-ocular malignancies, and ocular motor nerve palsies.
When all of the gated A-scan echoes for each x-y coordinate of a sample are collected, they can be decomposed by means of a Fast Fourier Transform into individual sinusoids.
It is a complete ready-to-run Windows application that receives, processes and scan converts multiple channels of radar video in 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.