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Flashcards in Physics reverse Deck (70)
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Amplitude Modulation

Distance between transducer and structure determines where an echo is seen along hte time axis

1 dimensional image

Not used anymore

A-Mode

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device in which data are represented by variable, measurable, physical quantities. Length, width, voltage or pressure

Analog Scan Converter

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2D presentation of echo producing interfaces.

A mode signal converted to dots which vary in brightness depending on echo strength

Brightness Modulation

B-Mode

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formation of cavities in a body tissue or an organ resulting from the sudden formation and collapse of low pressure bubbles by means of mechanical forces

Cavitation

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image processing device that uses a stable electronic circuit to store and manipulate ultrasonic images in memory. The device then reconstructs and displays these images simultaneously to create one image

Digital Scan Converter

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change in observed frequency of a wave. Freq increases as source and observer get closer, decreases as they move apart

Doppler effect

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series of shades from black to white the more shades the more realistically an image can be recorded and displayed

Gray Scale Imaging

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series of B-Mode dots are displayed on moving time base graph to show moving structures

basis of echocariography prior to real time scanning

used in conjunction with real time imaging in adult, pediatric and fetal echo

M-Mode

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Mechanical deformation occurs when an electrical field is applied to a crystal the crystal vibrates mechanically. When a crystal vibrates mechanically it creates an electrical field

Piezoelectric Effect

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waves sent from many directions to the returns are used to build a volume image in 3 dimensions

3-D imaging

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3-d imaging with the addition of real time

4-D Imaging

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sound with freq above the limits of human hearing greater than 20kHz

Ultrasound

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Waves that move in an up and down motoin

Transverse Waves

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Waves that move in a line

Longitudinal Waves

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area of wave that gets closer together

Compression

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area of wave that spreads apart

Rarefaction

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material through which a wave is transmitted

Medium

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period

frequency

amplitude

power

intensity

wavelength

propagation

Accoustic parameters

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time

Period of wave

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1/time

frequency of wave

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"Bigness" of wave

dofference between peak and avg value of the wave

amplitude of wave

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force

rate of energy transfer or rate which work is preformed

power

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concentration of strength of a wave

Intensity = watts/cm^2

intensity

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distance from one peak to the next

wavelength

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speed wave travels through medium (avg 1540 soft tissue)

propagation speed

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measurement of frequency

Hertz

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sound below the human hearing level

Infrasound

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20-20kHz

Audible sound

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2mHz-12mHz

DMS frequency

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any damage to tissue

ALARA as low as reasonably achievable

Bio effects