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
Spatial resolution in digital radiography is primarily determined by which factor?
pixel size
Which most accurately refers to the individual hardware elements of a digital radiography image receptor plate that detect radiation?
DEL
Which describes the effect of an increase in matrix size on digital image quality?
increase in spatial resolution
What is a mandated feature that must be on all digital display devices?
Grayscale standard display function
Which is true regarding the viewing of digital radiographic images?
Digital cathode ray tubes have replaced liquid crystal displays in recent years
