Section 3

Question 1

What is a pixel?

Answer 1

smallest amount of info in 2D image

Question 2

What is matrix size?

Answer 2

Number of pixels

Question 3

Few # of pixels =

Answer 3

coarse

Question 4

Big # of pixels =

Answer 4

fine

Question 5

Image size/FOV is

Answer 5

size of anatomical area being imaged

Question 6

Matrix size =

Answer 6

image size/ pixel size

Question 7

A binary digit can be

Answer 7

0 or 1

Question 8

Bit depth is

Answer 8

number of bits per pixel

Question 9

Higher bit depth means

Answer 9

more contrast

Question 10

1 byte has how many bits?

Answer 10

8 bits

Question 11

Resolution is the

Answer 11

image property of the ability for the smallest objects (detail) to be seen as separate

Question 12

Higher resolution means that you can

Answer 12

resolve the details that are smaller

Question 13

Low resolution is

Answer 13

blurring as a larger separation is needed

Question 14

A histogram is

Answer 14

a plot of # occuances ofpixel values

Question 15

Histogram equalisation adjusts the

Answer 15

contrast to expand histogram and keep shades that contribute diagnostic info

Question 16

Filtering is used

Answer 16

to enhance the certain aspects of the image

Question 17

How are coregistration and image subtraction different?

Answer 17

Coreg is about aligning the 2 images spatially whereas image subraction is about comparing the differences between 2 images

Question 18

What does compression ratio describe

Answer 18

describes the level of compression

Question 19

Which type of compression has a higher ratio

Answer 19

lossy compression

Question 20

DICOM stands for

Answer 20

Digital Imaging & Communications in Medicine

Question 21

PACS stand for

Answer 21

Picture Archiving & Communication System

Question 22

Lossless is where

Answer 22

the information is not lost

Question 23

What do we change in co-registration?

Answer 23

We can alter the kVp, the radiopharmaceutical, different imaging modalities

Question 24

DSA stands for

Answer 24

digital subraction angiography

Question 25

In DICOM, modalities like CT, NM, MRI are all

Answer 25

information objects

Question 26

Service class is when

Answer 26

an operation/service is carried out in info object, like printing, retrieval, copying

Question 27

Service class + info object is called

Answer 27

SOP = service object pair