Flashcards in Computer Science Intro to Digital Radiography Deck (18):
A digital image is displayed as a combination of:
Rows and columns (matrix)
The smallest component of the digital image is the:
Handles data composed of continuously varying electrical currents.
Handles data composed of definite quantities of current.
Needed to convert analog input into digital data for processing (converts analog signal into sequence of numbers)
Analog-to-digtal converter (ADC)
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)
ADC and DAC and digital processor make up the:
Digital Signal Processor
Location of the pixel within the image matrix corresponds to:
an area within the pt or volume of tissue.
Two systems available for digitizers:
Laser and CCD linear array
Computer performs all operations by converting everything to
binary values. There is less chance for error when operating in the binary code
Two-symbol alphabet – only two values are used – 0 and 1
1 = On
0 = Off
each binary number or a single binary digit (BInary digiT)
8 bits =
2 bytes =
an image constructed from numerical data
Digital imaging consists of
CR and DR
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