ultrasonography

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Related to A-scan: ophthalmic biometry

ul·tra·so·nog·ra·phy

 (ŭl′trə-sə-nŏg′rə-fē)
n.
The use of high-frequency sound waves to image internal body structures, a developing fetus, or objects and currents that are underwater. Also called echography.

ul′tra·so·nog′ra·pher n.
ul′tra·son′o·graph′ic (-sŏn′ə-grăf′ĭk, -sō′nə-) adj.

ultrasonography

(ˌʌltrəsəˈnɒɡrəfɪ)
n
(Medicine) the technique of using ultrasound to produce pictures of structures within the body, as for example of a fetus

ul•tra•so•nog•ra•phy

(ˌʌl trə səˈnɒg rə fi, -soʊ-)

n.
a diagnostic imaging technique utilizing reflected ultrasonic waves to delineate, measure, or examine internal body structures or organs.
[1950–55]
ultrasound, ultrasonography - Ultrasounds and ultrasonography work on the principle that sound is reflected at different speeds by tissues or substances of different densities.
See also related terms for reflected.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ultrasonography - using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram)ultrasonography - using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth or study bodily organs
prenatal diagnosis - any of the diagnostic procedures used to determine whether a fetus has a genetic abnormality
tomography, imaging - (medicine) obtaining pictures of the interior of the body
A-scan ultrasonography - the use of ultrasonography to measure the length of the eyeball
B-scan ultrasonography - the use of ultrasonography to view structure in the back of the eye
Translations

ul·tra·so·nog·ra·phy

n. ultrasonografía, técnica de diagnóstico que emplea ultrasonido para producir imágenes de una estructura o de tejidos del cuerpo.

ultrasonography

n ecografía (técnica); Doppler — ecografía Doppler; duplex — ecografía dúplex
References in periodicals archive ?
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.
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.
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.
40 A-scan were acquired at different locations in steps of 0.
The A-Scan Mode allows direct analysis of the raw signal and the real-time B-Scan Mode provides a cross-sectional view perpendicular to the scanning surface.
5 MHz single-element transducer * A-Scan mode showing waveform on display and saves images to memory * Metal thickness measuring through surface coating (for example paint) in A-Scan mode.