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acoustics |
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the science of sound, including its production, propagation and effects |
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acoustic enhancement |
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an area of increased echo intensity distal to a fluid filled area |
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acoustic wave |
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a mechanical disturbance which propagates through a continuous medium |
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acoustic window |
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any medium or structure that transmits sound well |
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anechoic |
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no internal echoes |
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artifact |
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part of an ultrasound image that does not accurately represent the underlying anatomy |
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attenuation |
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progressive weakening of the sound beam as it travels through body tissue |
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color flow imaging |
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ability to display bood flow in multipe colors depending on the velocity, direction of flow and extent of tubulence |
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complex |
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a structure that has both fluid filled and solid components |
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doppler |
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concern s the behavior of high frequency sound waves as they are reflected off moving fluid, usually blood. a waveform image is produced |
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duplex imaging |
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the simultaneous display of a gray scale image and the Doppler waveform |
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echo |
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a recorded acoustic signal |
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echogenic |
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a region containing a high amount of echoes |
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frequency |
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number of cycles per second |
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heterogeneous |
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does not have a uniform texture |
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homogeneous |
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used in the sense of having a uniform texture |
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hyperechoic |
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a region containing many echoes, used mainly to describe an area in relation to its surrounding structures |
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hypoechoic |
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a region that contains only a few echoes, used maily to descrie a area in relation to its surrounding structures |
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interface |
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surface forming the boundary between different structures |
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isoechoic |
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of the same echogenicity as a neighboring area, but not necessarily of the same texture |
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parenchyma |
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a general term for the tissue of an organ |
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real time imaging |
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type of imaging in which many frames are run together to create a cinematic view of the tissue |
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rocking |
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holding the transducer in one spot and angling along the curve or rounded protion of the scan head |
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rotating |
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twisting the transducer in a circular motion while holding it in one place |
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sector |
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shape of the image on the film, depends on the type of transducer that is used |
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shadowing |
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failure of the sound beam to pass through an object, causing the absense of echoes posterior |
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solid |
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defines a mass with no fluid areas |
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transducer |
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a device capable of convering energy from one form to another |
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ultrasound |
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sound waves which have a frequency above the audible range of the human ear |
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