A-scan ultrasonography
- noun
- /ˈeɪˌskæn ˌʌltrəˈsɒnəɡrəfi/
- Specialized
:
ultrasonido A-scan
- Accurate A-scan ultrasonography is crucial in calculating intraocular lens power before implantation.
Examples
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The ophthalmologist performed A-scan ultrasonography to obtain precise measurements for the patient's cataract surgery.
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The doctor performed an A-scan ultrasonography on the patient.
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Technicians receive special training to operate the equipment used in A-scan ultrasonography.
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Is this A-scan ultrasonography safe?
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The ophthalmologist performed A-scan ultrasonography to obtain precise measurements for the patient's cataract surgery.
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Accurate A-scan ultrasonography is crucial in calculating intraocular lens power before implantation.
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Technicians receive special training to operate the equipment used in A-scan ultrasonography.
Surface Forms
Morphology
A-scan + ultrasonography
The headword contains the transparent element 'ultrasonography' (an ultrasound imaging method) and the compound structure indicates a subtype (an 'A-scan' form of ultrasound), so learners can infer it is a kind of ultrasound scan. However, 'A-scan' is a technical label whose specific function (measuring axial eyeball length and calculating IOL power) is not derivable from the constituents 'A' + 'scan' or from general knowledge, so the precise meaning requires specialist knowledge.
Etymology
A-scan ultrasonography gets its name from the simple, one-line picture the machine makes: the A-scan part refers to the line of spikes the device draws as it sends sound into the eye. Because that single-line reading shows the front and back of the eye, doctors can 'measure the eyeball' and work out the right lens power, so the name ties directly to how it is used.
