Ultra sound instrumentation

Ultra sound instrumentation - Term Definition DF is_when...

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Term: DF is ____when the system is imaging at shallow depths . Definition: Lower Term: For a simple crystal there are 2 dimensions , they are: Definition: Diameter and crystal thickness Term: Crystal diameter plays a huge role in determine ..... ? Definition: Beam width Term: Crystal thickness plays a role in determine.. Definition: The transducers operating frequency. Term: Causes a decrease in the intensity with increasing distance from the transducer. Definition: Divergence of the beam.
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Term: Divergence is responsible for ? Definition: Intensity loss Term: 2 factors combine to determine beam divergence: Definition: Transducer diameter & frequency of the sound. Term: Crystal diameter and beam divergence are _____related. Definition: Inversely Term: Larger crystals improve lateral resolution in the ____field. Definition: Far Term: Frequency and beam divergence are ______related. Definition: Inversely
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Term: Higher frequency sound improves lateral resolution in the _____field. Definition: Far Term: The near field is called ____zone. Definition: Fresnel Term: The far field is called the _____zone. Definition: Fraunhofer Term: The lateral resolution deteriorates in the ____field. Definition: Far Term: The lateral resolution deteriorates in the far field region of the beam because of ____. Definition: Divergence
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Term: The diverging or spreading out of the wave as it propagates. Definition: Diffraction Term: The more cycles present in and US pulse creates _______of the frequency US emission. Definition: Purity Term: A long pure tone of sound at a single frequency. Definition: Resonant frequency Term: Resonant frequency is determined by ...? Definition: The transducer fabrication Term: The range of frequencies in an US beam. Definition: Bandwidth
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Term: The fewer cycles and US pulse contains the more ______it will contain. Definition: Frequencies Term: Describes the purity of the vibration of the PZT crystal. Definition: Q factor (quality factor) Term: Wide bandwidth probes = ____Q factor, and _____ring down. Definition: Low, short Term: Narrow bandwidth probes = ___Q factor, and _____ring down. Definition: High. Long Term: ______ Q transducers are desirable. Definition: Low
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Term: Refers to how closely two reflector or scattering regions can be to one another and still be identified as separate reflectors on an image. Definition: Spatial resolution Term: Spatial resolution symbol Definition: AR Term: Spatial resolution units Definition: mm Term: Sometimes called longitudinal , axial range, or depth resolution. Definition: Axial resolution Term: LARD refers to ...... Definition: Longitudinal , axial range , or depth resolution ( axial resolution) .
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Term: Axial resolution _____be changed by the sonographer. Definition: Cannot Term: Axial resolution depends on 3 characteristics of the US beam .... Definition: The SPL, US frequency , and damping factor. Term: ________depends primarily on the length of the U S pulse in space.
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