Physics Ch. 15-17

Question 1

Bistable means

Answer 1

that the image is black and white

Question 2

User controls for video monitors include

Answer 2

brightness and contrast

Question 3

If an image has a high contrast is has ______ shades of gray

Answer 3

few

Question 4

Analog numbers are

Answer 4

real world values, unlimited, exact number value

Question 5

Smallest building block of a digital picture

Answer 5

pixel

Question 6

Translates information for the spoke format received from the transducer to the video format

Answer 6

scan converter

Question 7

Today’s ultrasound machines use ______ scan converters

Answer 7

digital

Question 8

List the advantages of digital scan converters

Answer 8

1. stability 2. uniformity 3. durability 4. accuracy 5. speed

Question 9

Each pixel can display how many shades of grey

Answer 9

one

Question 10

Smallest amount of computer memory

Answer 10

bit/binary digit

Question 11

A byte is equal to _____ bits

Answer 11

8

Question 12

Where does coded excitation occur

Answer 12

pulser

Question 13

What all applies to write magnification

Answer 13

aquires new data, improved spatial res, same pixel size, pre processing and more pixels than the original ROI

Question 14

PACS=

Answer 14

picture archiving and communications system

Question 15

Means number of available choices

Answer 15

dynamic range

Question 16

Represents the level below which information will not be displayed

Answer 16

threshold

Question 17

If the fundamental frequency is 3.5 MHz, what is the harmonic frequency

Answer 17

7 MHz

Question 18

Harmonic frequency sound arises from ______ behavior

Answer 18

non-linear

Question 19

A ______ pixel density improves spatial resolution

Answer 19

high

Question 20

What is persistence a synonym for

Answer 20

temporal compounding/temporal averaging

Question 21

Which image processing technique is especially helpful to differentiate benign from malignant lesions

Answer 21

elastography

Question 22

How many pulses are transmitted down each scan line with frequency compounding

Answer 22

one

Question 23

Which imaging technique is used to create data where non existed

Answer 23

fill-in interpolation

Question 24

Which image processing method only works with sector shaped images and improves spatial resolution

Answer 24

fill-in interpolation