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Flashcards in Intro Quiz 1 Physics Deck (140)
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61

Real Time B-Mode

provides cinematic view of the area being evaluated by displaying a rapid series of images sequentially

62

Real Time Imaging

all modern systems use real time approach

signals integrated into a scan converter for 2d image display

Real time movie

 

63

Frame Rate

Hz

images per second

2 factors Sound speed in medium

depth of imaging

higher frame rate better temporal resolution and image quality

64

Temporal resolution

ability to precisely position a moving structure

important in adult and fetal echo

high rate yields better movies but worse photographs

65

imaging depth

shallow depth incrases frame rate and resolution

deeper decreases frame rate and degrades resolution

depth and frame rate inversely related

operator controlled 

66

Focus

Single Focus

Multi Focus

67

Single Focus

only 1 sound pulse is transmitted down the scan line

high frame rate 

superior resolution

inferior lateral resolution

68

Multi Focus

Adj number of focus Pulses

longer time 

decreases frame rate

inferior temporal resolution

superior lateral resolution

69

lateral resolution

ability to distinguish between structures that are side by side

70

sector size

field of view

operator controlled

size increases number of pulses increases

 

71
reverse

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

72
reverse

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

Analog Scan Converter

73
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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

74
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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

75
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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

76
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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

77
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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

78
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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

79
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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

80
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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

81
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3-d imaging with the addition of real time

4-D Imaging

82
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sound with freq above the limits of human hearing greater than 20kHz

Ultrasound

83
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Waves that move in an up and down motoin

Transverse Waves

84
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Waves that move in a line

Longitudinal Waves

85
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area of wave that gets closer together

Compression

86
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area of wave that spreads apart

Rarefaction

87
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material through which a wave is transmitted

Medium

88
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period

frequency

amplitude

power

intensity

wavelength

propagation

Accoustic parameters

89
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time

Period of wave

90
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1/time

frequency of wave