Chapter 15

Question 1

Analog numbers give us _____ possibilities

Answer 1

INFINITE. Think of an analog watch and how you can see every second going by

Question 2

Digital numbers give us ______ possibilities

Answer 2

Limited. Think of a digital watch, you can’t see the seconds.

Question 3

Pixel stands for

Answer 3

Picture element

Question 4

Higher pixel density equals ______ spatial resolution

Answer 4

Higher

Question 5

The scan converter is also known as______ and takes two steps:

Answer 5

AKA Memory.
1. Writing (storage)
2. read (display)

Question 6

A bistable image is

Answer 6

Black and white

Question 7

Bit stands for

Answer 7

Binary digit

Question 8

A bit is the ______ amount of computer memory

Answer 8

Smallest

Question 9

A byte contains __ bits

Answer 9

8

Question 10

A word contains ___ bytes.

Answer 10

2 bytes (so 16 bits)

Question 11

Preprocessing is any processing done _______ storage

Answer 11

Before

Question 12

Post processing is any processing done _____ storage

Answer 12

After

Question 13

Magnification can be done before or after taking the picture. These two options are called

Answer 13

Write magnification and read magnification.

Question 14

What is spatial compounding

Answer 14

Using info of the same structure but from different angles to make one image. This improves quality

Question 15

What is temporal compounding

Answer 15

Using various images from different times and basically putting one on top of the other to make ONE single best image

Question 16

What is fill-in interpolation

Answer 16

Construction of new simulated data to fill in the gaps between the sound beams

Question 17

Describe elastography

Answer 17

Elasticity of tissue when you apply a force and how it moves (density/ stiffness) think of the gelatina example

Question 18

Coded excitation improves

Answer 18

Image quality, signal to noise ratio, axial and spatial resolution, contrast, and penetration

Question 19

Coded excitation is determined by

Answer 19

Pulser