Digital Imaging Flashcards
The system used to view and store digital x-ray images is called a _____ system
PACS
Fog affects radiographic quality by causing
Decreased Contrast
A low kVp setting produces an image with
A short scale of contrast
The universally accepted standard for exchanging radiographic images inside and outside the institution, among all manufacturers, is which?
DICOM
What is the name of the computer software functions hat allows separate radiographic images to be tied into one image for viewing?
Image stitching
Which of the following would be considered involuntary motion by the patient?
1)tremor
2)peristalsis
3)breathing
1 & 2
Which of the following must be used with digital based x-ray procedures to ensure ALARA concept is practiced?
An exposure technique chart
Shape distortion is the result of:
Unequal magnification of the actual shape of the structure
This occurs when there may be a defect in a component of the computer screen matrix that may cause a loss of patient information
Dead pixels
One of the main advantages of using CR and DR digital systems is:
Ability to process images very fast
The difference in density between any two adjacent portions of the image is called
Radiographic contrast
Quantum mottle occurs in digital images if
There are not enough photons reaching the IR
The term used in the new digital environment to replace density is
Brightness
Which of the following artifacts can occur if the CR imaging plate receives too much background scatter radiation?
Fogging
Which of the following is important to use when using digital systems for mobile radiography?
Grid
Which of the following are the prime factors of exposures in radiography?
Ma, exposure time, kilovoltage, SID
If an image is made using 500 mA, 0.1 second, and 75 kVp, What would the mAs be for this exposure?
50 mAs
The geometric factors that affect the formation of the image are:
1) SID
2) OID
3) Focial spot
1,2,&3
A matrix of 1200 x 1800 will show how many pixels on the viewing monitor?
2,160,000
Another name for size distortion is
Magnification
When it is necessary to differentiate tissues with similar tissue densities, which of the following image quality factors is most desireable?
High contrast
An increase in OID will result in
Increased magnification
When an image demonstrates only a few densities, and there is a great difference between the densities, the image is described having
Short scale contrast
What is the term for the calibration of an image display system that ensures that all radiographic images gray scales are presented consistently?
DICOM grayscale function
The primary controller of radiographic density is
MAs
A CCD (charged coupled device) is used in an indirection conversion DR system to
Convert light into an electrical signal
If a radiographer produced an image using an x-ray exposure that is below the dynamic range, the resulting image is expected to display?
Quantum mottle
The spatial resolution of a radiography system is expressed in units of
Line pairs per millimeter
When SID is increased, which change must be made to maintain IR exposure?
Increase mAs
The ability to produce quality radiographs using a wide range of technical factors is called
Exposure latitude
The response of the detector to different levels of radiation exposure is termed
Dynamic range
The ability of a digital system to convert the x-ray input electrical signal into a useful radiographic image is termed the
Signal to noise ratio
Which of the following takes the stored charge in the flat-panel detector and converts it into a digital value
analog to digital converter (ADC)
Which of the following will be seen in the x-ray image if either the kVp or mA is set too low for the projection?
Quantum mottle
