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| sound waves beyond the audible range use frequencies of: |
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| transmission of high frequency mechanical vibrations greater than: |
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described by the Curie brothers in 1880
"pressure electric" describes property of certain crystals (quartz) expanding and contracting in response to the application of an electric field |
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device that converts electrical energy to ultrasonic energy
has a transmitter and receiver |
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| measures the ability to distinguish between adjacent structures |
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| a propagation of energy that moves back and forth or vibrates at a steady rate |
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| ultrasonic wave can be focused, refracted reflected, or scattered between different media |
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| ultrasound beam can be reflected depending on the difference in ____ between two media and ___ to which the beam hits the interface |
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| reduction of acoustic amplitude along propagation pathway as a result of diffraction, absorption, scattering, reflections, or any other process that redirects the signal away from the receiver |
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| soundwaves that are reflected by internal structures back to transducer |
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| mechanical oscillations that are trasnmitted by particlesin gas, liquid, or solid medium |
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| sound waves beyond the audible range of 16,000-20,000 Hz |
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| acoustic energy reflected from a structure that interferes with the expected path |
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| diffusion or redirection of sound in different directions |
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| to concentrate sound beam into a smaller beam than would exist without focusing |
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| impedes sound transmission |
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| sound varies slightly from one to another |
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multiple frames per second over selected area of the body
gives ability to visualize structures as they change position |
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a change in the frequency when the mition of laminar or turbulent flow is detected within a vascular structure
determines velocity and direction of blood flow |
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| technique that assigns a color sclae to the change in frequency or doppler shift |
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| signifies direction of flow towards the transducer |
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| signifies a shift away from the transducer |
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| used inside the transducer, behind the piezoelectric element to absorb useless vibrations |
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| used for abdomen and OB (large surfaces) |
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| used for breast, thyroid, scrotum, limbs, or other superficial areas |
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| transducers range from low frequencies of __ MHz to higher frequencies __ MHz |
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| the smaller the part imaged, the ___ the frequency used |
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| has low-level echoes with a good posterior border |
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bright echo reflectors and possible shadowing
may reprsent a tumor, thrombus, or calcification |
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| same texture pattern as the surrounding parenchyma with no significant change through transmission |
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| shows no internal echoes, smooth walls, displays increased through transmission |
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| a mass that shows more than one pattern is considered |
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| upper abdominal exams are best preformed after patient has been fasting for a minimum of ___ hours to show bile duct distended |
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| abdominal scanning is performed in these planes: |
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Definition
transverse
oblique
sagittal
coronal
subcostal planes |
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| structures that can be visualized for neonatal neurosonography |
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Definition
ventricular system
septum pellucidum
corpus callosum
choroid plexus
posterior fossa
vermis
cerebrum |
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| a full bladder is required because it serves as a ___ |
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| procedure of choice when evaluating gestational sac, embryo, yolk sac, and amniotic cavities |
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| color flow doppler is used to evaluate |
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| color flow doppler can also denote ____ within a vessel |
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