Quiz C23 (Bush) Flashcards
The three classifications of digital imaging artifacts are _______________________.
image receptor, software, and object
A ghost image can occur in digital imaging because of ____________________.
incomplete erasure
During preprocessing, the digital output of the image receptor may need to be manipulated to correct for _________________.
dead pixels
__________________ is done during preprocessing to correct for an irregular pattern over the image.
Flatfielding
The software correction that equalizes the response of each pixel to a uniform exposure of x-rays is called _______________.
flatfielding
Which is/are done to the image during preprocessing?
I. Lossless compression
II. Partitioning
III. Flatfielding
flatfielding
Which modality produces the largest image files?
Digital mammography
Computed radiography cassettes can sit for ____________ between exposures.
a few days
The size and number of digital images have to be compressed to permit ___________.
transmitting and archiving
Computer aided diagnosis (CAD) requires the use of ______________________.
uncompressed images
Object artifacts in digital imaging can occur from errors in ___________________.
x-ray beam collimation, histogram selection, and patient positioning
Backscatter radiation artifacts can occur more readily in digital imaging because of the ____________________.
highly sensitive receptors
A graph of the frequency of occurrence versus digital value intervals is called a(n) ________________.
histogram
Each anatomical part has an image histogram with a(n) _______________ shape.
characteristic
Histogram selection is done ____________________________.
by the radiographer before each exam
