Intro Quiz 1 Physics Flashcards Preview

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Flashcards in Intro Quiz 1 Physics Deck (140)
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121
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strongly echoic

usually with acoustic shadows

calcified echoes

122
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mixed echogenicity

with or without shadowing

 

Complex

123
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Device that converts energy from one form to another

 

Transducers

124
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Crystal

matching layers

Damping material

Transducer case

electronic cable

Transducer components

125
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diameter determines beam shape

like beam of flashlight

shape is region in the patient which sound travels

Crystal

126
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provide an acoustic connection between crystals and skin

reduces amount of reflection from large acoustic mismatch

allows wave to travel into the body

gel

matching layers

127
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decrease secondary reverberations of crystal with returning signals

reduces the ring time and results in an increase in depth resolution (axial)

Damping material

128
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provides housing for all internal components

Trasducer Case

129
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caontains bundle wires to cary electrical signals to and from the crytals

Electronic cable

130
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uses series of B-mode images to biuld a 2 d image of tissue

transducer attached to articulated arm to provide system with position and orientation

no longer used due to numerous drawbacks

B-scan (Static scan)

 

131
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provides cinematic view of the area being evaluated by displaying a rapid series of images sequentially

Real Time B-Mode

132
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all modern systems use real time approach

signals integrated into a scan converter for 2d image display

Real time movie

 

Real Time Imaging

133
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Hz

images per second

2 factors Sound speed in medium

depth of imaging

higher frame rate better temporal resolution and image quality

Frame Rate

134
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ability to precisely position a moving structure

important in adult and fetal echo

high rate yields better movies but worse photographs

Temporal resolution

135
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shallow depth incrases frame rate and resolution

deeper decreases frame rate and degrades resolution

depth and frame rate inversely related

operator controlled 

imaging depth

136
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Single Focus

Multi Focus

Focus

137
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only 1 sound pulse is transmitted down the scan line

high frame rate 

superior resolution

inferior lateral resolution

Single Focus

138
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Adj number of focus Pulses

longer time 

decreases frame rate

inferior temporal resolution

superior lateral resolution

Multi Focus

139
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ability to distinguish between structures that are side by side

lateral resolution

140
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operator controlled

size increases number of pulses increases

 

sector size

field of view