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Flashcards in 14 reverse Deck (29):
1

Converts electrical to acoustic energy (transmission) Converts acoustic to electrical energy (reception)

Transducer

2

Communicates organizes and times the functions

Master Synchronizer

3

determines the amplitude, PRP, and PRF occurs during transmission creates and controls electrical signal sent to transducer

Pulser

4

determines the firing, delay patterns for phased array system

Beam Former

5

transform electrical signals from the transducer into a form suitable for display

Receiver

6

Monitor

Display

7

archives the ultrasound studies storage devices include: computer hard drives, CD, DVD, videotape, magneto-optical discs, paper printouts, photographs, and USB

Storage

8

effects entire image use during transmission can cause exposure/ bioeffects Adjustable

Transducer output

9

output gain, acoustic power, pulser power, energy output, transmitter output, power or gain

Transducer Synonyms

10

random and persistent disturbance that obscures or reduces a signal's clarity

Noise

11

signal is much stronger than the noise and the image is a high quality

Signal to Noise when high

12

degrades image strength is closer to strength of the noise

Signal to Noise when low

13

comparison of the meaningful info (signal) to the amount of contamination (noise)

Signal to Noise

14

increase

increase output power, signal to noise ratio ______.

15

inversely

PRP and PRF are what related

16

Yes

Is PRP adjustable

17

shorter listening time shorter PRP higher PRF

Shallow Imaging listening time PRP PRF

18

longer listening time longer PRP lower PRF

Deep Imaging listening time PRP PRF

19

adjust electrical spikes voltage to reduce love artifacts

Apodization

20

1. Amplification 2. Compensation 3. Compression 4. Demodulation 5. Reject

Order of Receiver Operations

21

adjustable all signals trated identically entire image gets brighter or darker

Amplification adjustable? singals processed Effects on image

22

adjustble signals treated differently based on reflector depth image will be uniformly bright from top to bottom

Compensation adjustable? singals processed Effects on image

23

adjustable signals treated differently depending on strength changes gray scale mapping

Compression adjustable? singals processed Effects on image

24

not adjustable prepares electrical signals to be suitable for display none

Demodulation adjustable? singals processed Effects on image

25

adjustable only weak signals affects; strong signals remain unchanged weal echoes appear or are eliminated from image

Reject adjustable? singals processed Effects on image

26

uses damping material to create short pulses, which provides better axial resolution use only high frequencies

Dynamic Frequency Tuning

27

As Low As Reasonably Achievable minimizes the patients ultrasound exposure

ALARA

28

changes brightness of entire image alters signal to noise ratio alters patient exposure bioeffect concerns decrease this first if image is too bright

Output Power vs Receiver Gain Output Power

29

changes brightness of entire image doesn't affect signal to noise ratio doesn't change patient exposure no bio effect concern increase this first if image is too dark

Output Power vs Receiver Gain Receiver Gain