Intro Quiz 1 Physics Flashcards Preview

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Flashcards in Intro Quiz 1 Physics Deck (140)
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1

A-Mode

Amplitude Modulation

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

1 dimensional image

Not used anymore

2

Analog Scan Converter

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

3

B-Mode

2D presentation of echo producing interfaces.

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

Brightness Modulation

4

Cavitation

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

5

Digital Scan Converter

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

6

Doppler effect

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

7

Gray Scale Imaging

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

8

M-Mode

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

9

Piezoelectric Effect

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

10

3-D imaging

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

11

4-D Imaging

3-d imaging with the addition of real time

12

Ultrasound

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

13

Transverse Waves

Waves that move in an up and down motoin

14

Longitudinal Waves

Waves that move in a line

15

Compression

area of wave that gets closer together

16

Rarefaction

area of wave that spreads apart

17

Medium

material through which a wave is transmitted

18

Accoustic parameters

period

frequency

amplitude

power

intensity

wavelength

propagation

19

Period of wave

time

20

frequency of wave

1/time

21

amplitude of wave

"Bigness" of wave

dofference between peak and avg value of the wave

22

power

force

rate of energy transfer or rate which work is preformed

23

intensity

concentration of strength of a wave

Intensity = watts/cm^2

24

wavelength

distance from one peak to the next

25

propagation speed

speed wave travels through medium (avg 1540 soft tissue)

26

Hertz

measurement of frequency

27

Infrasound

sound below the human hearing level

28

Audible sound

20-20kHz

29

DMS frequency

2mHz-12mHz

30

Bio effects

any damage to tissue

ALARA as low as reasonably achievable