Computer Science Intro to Digital Radiography

Question 1

A digital image is displayed as a combination of:

Answer 1

Rows and columns (matrix)

Question 2

The smallest component of the digital image is the:

Answer 2

pixel

Question 3

Handles data composed of continuously varying electrical currents.

Answer 3

Analog computers

Question 4

Handles data composed of definite quantities of current.

Answer 4

Digital computers.

Question 5

Needed to convert analog input into digital data for processing (converts analog signal into sequence of numbers)

Answer 5

Analog-to-digtal converter (ADC)

Question 6

Converts this info back into analog signals so that it can be interpreted by analog display device such as a TV monitor.

Answer 6

Digital-to-analog converter (DAC)

Question 7

ADC and DAC and digital processor make up the:

Answer 7

Digital Signal Processor

Question 8

Location of the pixel within the image matrix corresponds to:

Answer 8

an area within the pt or volume of tissue.

Question 9

Two systems available for digitizers:

Answer 9

Laser and CCD linear array

Question 10

Computer performs all operations by converting everything to

Answer 10

binary values. There is less chance for error when operating in the binary code

Question 11

Two-symbol alphabet – only two values are used – 0 and 1
1 = On
0 = Off

Answer 11

Binary system.

Question 12

Bit

Answer 12

each binary number or a single binary digit (BInary digiT)

Question 13

8 bits =

Answer 13

1 byte

Question 14

2 bytes =

Answer 14

word

Question 15

Digital image

Answer 15

an image constructed from numerical data

Question 16

Digital imaging consists of

Answer 16

CR and DR

Question 17

Example of digital image processing (CT):

Answer 17

Detectors convert the x-ray photons into electrical signals (analog signals) that must be converted into numeric data (digital data) for input into a digital computer

Question 18

_______ are compatible w/ conventional x-ray equipment. _________ are not…conventional equipment must be modified or replaced.

Answer 18

Digital Fluoroscopy and CR