Digital Radiology Flashcards
What is the primary difference between film based and digital radiology?
Images are electronically captures, recorded and viewed at a computer terminal instead of using film and a view box
The conventional screen film cassette is replaced by a reusable receptor called a _______
Detector
Broad term for computers and components used to capture, transfer, store, retrieve and display medical digital information
PACS (Picture Archiving and Communication Systems)
Unlike traditional screen film radiography, kVp has _____ effect on the contrast or latitude of the digital image
little to no effect
The number of electrons trapped by the digital image receptor during an x-ray exposure is _____ related to the intensity of the xray beam
linearly
Digital images have more ____ (more sahdes of gray) than film images
latitude
Digital images can display ____ ____ body parts while simultaneously displaying soft tissue
high contrast
_______ tools allow for viewing only bone or soft tissue from a single exposure
Subtraction
While the radiation dose of CR systems is comparable to film-based systems _____ ____ is NOT.
Spatial resolution
The spatial resolution of a general screen/film system is __-__ line pairs per _____
7-8, millimeter
The spatial resolution of CR systems is often less than half that of general screen/film, ranging from ___-___ line pairs per ____
2.5-5, millimeter
In the majority of applications, ___ does not perform as well as ___ in the spatial resolution category
CR does not perform as well as film
CR is better than film in what area? (Which also impacts the diagnostic utlility of images)
Contrast resolution
What imagine systems are available for viewing within several seconds of exposure?
CCDs and flat panel receptor digital imaging
What imaging system has the disadvantage of having to be processed similarly to a cassette?
Computed Radiography
Higher ___ does not affects the quality of the image as it is no longer affecting contrast and latitude in digital imaging
kVp
In what circumstances are images unable to be corrected in digital imaging?
Patient motion, gross errors in exposure settings
What has the highest possible standard of quality in image management?
DICOM
The ____ signal (from the light emitted by the scintillating screens) is converted to a digital signal
analog
The more bits the _____ the contrast resolution
higher
The digital signal is represented as between __ and __ bits
8 and 12
______ offers easy access to specialists who provide timely consultations on your ECG, radiograph or ultrasound images
Telemedicine
The radiographic image is digitized into millions of tiny squares known as ____ aka ____ ____
pixels, picture elements
Pixels are arranged into ____ and ____
rows and columns
