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RADT425 Ch.1 & 2

QuestionAnswer
How does elongation occur? There was an angle towards the body part and the CR was not likely perpendicular to the part
What can we do to reduce the amount of inevitable magnification? Increase SID
If the IR was placed against the medial aspect of the patient's leg and the CR was centered to the lateral aspect, what projection of the leg was taken? Lateromedial
Intensity refers to the total quantity of x-ray photons that expose the patient and IR. The controlling factor for intensity and IR exposure is: Milliampere-seconds (mAs)
The _____ represents the ideal histogram for the projection. LUT
What type of patient condition causes the tissues to decrease mass density or thickness and become more radiolucent? Destructive
What is the reasoning behind AEC early termination? Anatomy of interest was not properly placed over the activated cells causing direct radiation to go into chamber
The _______ dimension of the thorax expands the most during respiration. Vertical
On a properly positioned AP chest projection, ____ posterior ribs are demonstrated above the diaphragm. 9
For a Transthoracic Humerus, how long should the exposure be made? 3-5 seconds
We want ____ (high/low) signal and ____ (high/low) noise. High signal and low noise
A technologist / QA workstation has ________ (higher/lower) resolution than a Radiologist workstation. lower
A Radiologist workstation has ________ (higher/lower) resolution than a technologist workstation. higher
_____________ allows us to change the collimation field size and then reprocess the image. Post processing
What statement states "It is the position of the American Society of Radiologic Technologists that a digital image should not be cropped or masked such that it eliminates areas of exposure from the image that are presented for interpretation" ASRT position statement
Collimation should be within _____ of the outer tissue margins. 0.5 inch
Bilateral projections generally are for what 3 body parts? Hands, feet, knees
When an angled CR or diverged beam is used to record an object: the object will move in the direction in which the beams are traveling
With magnification, the part ______ (closest/farthest) from the IR will be magnified the _______ (least/most) farthest, most
For the most optimal spatial resolution we should use _________. less than 300mA, longer SID, shorter OID.
What amount of exposure time can nearly freeze radiographic motion? .033 seconds
Longer SID = _______ (increased/decreased) Spatial Resolution. increased
At a 40" SID, beams diverge at about: 2 degrees per inch
At a 72" SID, beams diverge at about: 1 degree per inch
CR cassettes should be erased after how much time has passed? 48 hours
With AEC, the technologist primarily controls what factors? kVp and mA
What turns on if the AEC is malfunctioning? AEC backup-timer
What is Aspect Ratio? Relationship between the width and height of an image
What is the definition of Spatial Resolution? Ability of an imaging system to differentiate between two nearby objects
T/F: Larger matrix sizes are better. True
T/F: Smaller pixel sizes are better. True
What is Pitch? The distance from the center of one pixel to the center of the next
What is contrast resolution? The ability to distinguish between differences in image intensity
Ambient Lighting “peripheral glare” of a monitor screen can occur depending on the viewer's: Viewing angle
Veil Glare is: Stray light that fogs images on a monitor
In a histogram, peaks and valleys represent: subject contrast in remnant radiation determined by total exposure used to create the image
What helps maintain consistent image brightness despite overexposure or underexposure? Automatic Rescaling
T/F: The histogram shape should be consistent with body part imaged. True
Created by: rdwilliams
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