Digital Imaging Flashcards
Which aspect of a digital display device should be evaluated by using the TG 18-PX test pattern?
Display resolution
What is a histogram?
it is a plot between frequencies of occurrence versus the digital value of each pixel
Which artifact is unique to digital radiography?
Pixel failure
Which test pattern should a radiologic technologist use regularly for the overall evaluation of various digital display characteristics?
TG 18-QC
Which describes quantum noise?
an image effect of too little exposure on a digital image receptor
Which process must radiographic images go through to be converted to a digital form?
Digitizing
Which is a direct capture digital image receptor?
Flat panel detectors with amorphous selenium
Which substance is found in the system with the best spatial resolution?
Amorphous Selenium
How does digital radiography create a radiographic image?
it converts x-ray energy into a digital electronic signal
Which process helps reduce the heel effect on digital radiographic images?
Flatfielding
Which process helps to improve the visibility of a digital image?
Magnification
Which term is used to describe the random scattering of light on a digital display device?
Diffuse reflection
What is the function of a cassette?
it holds the photostimulable phosphor imaging plate
Which is the term for the picture elements in a digital image?
Pixel
Which term refers to the organized arrangement of a digital image into columns and rows for display on a cathode ray tube?
image matrix
