Computer Science Intro to Digital Radiography Flashcards Preview

XR220 Image Production and Evaluation II > Computer Science Intro to Digital Radiography > Flashcards

Flashcards in Computer Science Intro to Digital Radiography Deck (18):
1

A digital image is displayed as a combination of:

Rows and columns (matrix)

2

The smallest component of the digital image is the:

pixel

3

Handles data composed of continuously varying electrical currents.

Analog computers

4

Handles data composed of definite quantities of current.

Digital computers.

5

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

Analog-to-digtal converter (ADC)

6

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

Digital-to-analog converter (DAC)

7

ADC and DAC and digital processor make up the:

Digital Signal Processor

8

Location of the pixel within the image matrix corresponds to:

an area within the pt or volume of tissue.

9

Two systems available for digitizers:

Laser and CCD linear array

10

Computer performs all operations by converting everything to

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

11

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

Binary system.

12

Bit

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

13

8 bits =

1 byte

14

2 bytes =

word

15

Digital image

an image constructed from numerical data

16

Digital imaging consists of

CR and DR

17

Example of digital image processing (CT):

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

18

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

Digital Fluoroscopy and CR