Kremkau Chapter 1 - Key Terms

Question 1

Ultrasound

Answer 1

Sound having a frequency greater than what humans can hear (greater than 20kHz).

Question 2

Sonography

Answer 2

Medical 2D, cross sectional, and 3D anatomic and flow imaging using ultrasound

Question 3

Color-Doppler Display

Answer 3

The presentation of 2D, real time Doppler-shift information in color superimposed on a real-time, gray-scale, anatomic, cross-sectional image. Flow directions toward and away from the transducer (i.e., positive and negative Doppler sifts) are presented as different colors on the display.

Question 4

Doppler effect

Answer 4

A change in frequency caused by reflector motion

Question 5

Gray-scale image

Answer 5

Range of brightness (gray levels) between black and white. The brightness of each of each dot (created by the ultrasound instrument processing the echoes). corresponds to the echo strength.

Question 6

Image

Answer 6

A reproduction, representation, or imitiation of the physcial form of a person of thing.

Question 7

Linear image

Answer 7

An anatomic image presented in a rectangular format.

Question 8

Pulse-echo technique

Answer 8

Ultrasound imaging in which pulses are reflected and used to produce a display.

Question 9

Scan line

Answer 9

A line produced on a display that preresents ultrasonic echoes returning from the body. A sonographic image is composed of many such lines.

Question 10

Sector image

Answer 10

An anatomic image presented in a pie slice-shaped format.

Question 11

Spectral Doppler display

Answer 11

The presentation of Doppler informtaion in a quantitative form of Doppler shift versus time. Visal display of a Doppler spectrum.

Question 12

Transducer

Answer 12

A device that converts energy from one form to another.

Question 13

Volume imaging

Answer 13

3D imaging