Pulse-Echo Instrumentation Flashcards Preview

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Flashcards in Pulse-Echo Instrumentation Deck (32):
1

Amplification

Receiver Gain

2

Analog

relating to or using signals or information represented by a continuously variable physical quantity such as spatial position or voltage

3

Analog-to-Digital Converter

In Beam former; converts voltage amplitude to a number; analog to digital suitable for computer memory

4

Beam Former

Beam former electronically determines
Shape and steer of beam by firing delays
Then sends signals accordingly to transducer

5

Bistable

an electronic circuit that has two stable states

6

Bit

A bit (short for binary digit) is the smallest unit of data in a computer

7

Cathode-ray tube

a high-vacuum tube in which cathode rays produce a luminous image on a fluorescent screen, used chiefly in televisions and computer terminals

8

Coded Excitation

creating very long sound pulses containing a wide range of frequencies, distributing energy over a broad frequency range

9

Compensation

Used to make image uniformly bright from top to bottom

10

Compression

Compression decreases the difference between the largest and the smallest voltages or echo amplitudes

11

Contrast Resolution

Contrast resolution is the ability to distinguish between differences in intensity in an image

12

Demodulation

Demodulation is the act of extracting the original information-bearing signal from a modulated carrier wave

13

Depth Gain Compensation

TGC - Increases amplification at varying depths

14

Digital-to-analog converter

In Image Proceimage data ssor; Converts processed digital into analog signals suitable for the TV video display

15

Dynamic Range

Ratio of the largest to the smallest amplitude or power that a system can handle is called Dynamic Range

16

Frame Rate

the number of sonographic images stored into memory per second

17

Gain

ratio of amplifier output to input electrical power

18

Gray Scale

Ultrasonography that displays small differences in an acoustical impedance as if they were different shades of gray.

19

Image Memory

Temporarily stores images during scanning, for viewing and recording

20

Image Processor

An electronic device that reformats echo data into image form

21

Persistence

averaging of sequential frames together to get a smoother image

22

PACS

Picture archiving and communications systems

23

Pixel

a minute area of illumination on a display screen, one of many from which an image is composed.

24

Postprocessing

after scan converter memory - ability to change image after it is taken.

25

Preprocessing

before scan converter memory
Persistence
Panoramic imaging
Spatial compounding
3D processing
Storage of image

26

Real-time

ultrasound technique used to obtain images of soft tissue as they move in real-time.

27

Real-time Display

Because several images can be presented per second its called a “real time” display

28

Scan Converter

Image Memory

29

Signal Processor

Signal processing is an enabling technology that encompasses the fundamental theory, applications, algorithms, and implementations of processing or transferring information contained in many different physical, symbolic, or abstract formats broadly designated as signals.

30

Spatial Compounding

averaging of frames that view anatomy from different angles

31

Temporal resolution

Temporal resolution (TR) refers to the precision of a measurement with respect to time.

32

Time Gain Compensation

Time Gain Compensation (TGC) is a setting applied in diagnostic ultrasound imaging to account for tissue attenuation. By increasing the received signal intensity with depth, the artifacts in the uniformity of a B-Mode image's intensity are reduced.