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RADT 465 Image Prod.

ARRT registry review covering image production

QuestionAnswer
The fixed spatial resolution characteristic of direct digital systems is termed by what? TFT & DEL size (Lange Q&A p. 167)
An algorithm, as used in x-ray imaging, is/ are what? A series of variable instructions (Lange Q&A p.167 )
The part of a detector element (DEL) that stores electrical charges is the Capacitor (Lange Q&A p.168 )
Grid cutoff due to off-centering would result in what? Overall loss of receptor exposure (Lange Q&A p. 169)
The postprocessing function that removes high frequency noise from an x-ray image is Smoothing (Lange Q&A p.169 )
If an IR exposed using a 12:1 ratio grid exhibits loss of signal at its lateral edges, it is probably because why? SIF was too great (Lange Q&A p.169 )
What can foreshortening be caused by? The radiographic object being placed at an angle to the IR (Lange Q&A p.169 )
The device that functions that terminates the x-ray exposure following ionization of a particular quantity of an air is the AEC (Lange Q&A p.170 )
The primary function of x-ray beam filtration is to Reduce patient dose (Lange Q&A p.171 )
What part of the detector element (DEL) that functions as a switch/gate to release charges for readout is the TFT (Lange Q&A p.171 )
What device is used to overcome severe variation in patient anatomy or tissue density, providing more uniform receptor exposure? Compensating filter (Lange Q&A p.172)
The distance between the center of one pixel and the center of an adjacent pixel is termed what? Pixel pitch (Lange Q&A p.173 )
Because of the anode heel effect, the intensity of the x-ray beam is greatest at Cathode end of the beam (Lange Q&A p.173)
Analog-to-digital conversion is required in which of the following imaging system? A larger field matrix (Lange Q&A p.173)
For the same field of view (FOV), spatial resolution will be improved using A larger matrix (Lange Q&A p.173 )
In what way does SID affect sharpness of an images detail? Image detail sharpness is directly related to SID (Lange Q&A p.175 )
The quality assurance term used to describe consistency in exposure at adjacent mA station is Linearity (Lange Q&A p.175 )
What factors impact spatial resolution? Focal spot size, subject motion, and SOD (Lange Q&A p.175 )
How are milliampere seconds and patient dose related? Milliampere seconds and patient dose are directly proportional (Lange Q&A p.176 )
What is an example of a pathologic condition that would require a decrease in exposure factors? Emphysema (Lange Q&A p.176 )
What pixel size has a 512X512 matrix with a 20cm field of view (FOV)? 040mm/pixel (Lange Q&A p.176 )
Foreshortening of the radiographic image is a result of what? Improper part alignment (Lange Q&A p.177 )
Misalignment of the tube-part-IR relationship results in what? Shape distortion (Lange Q&A p.177 )
Exposure rate will decrease with an increase in SID (Lange Q&A p.178 )
As digital image matrix size increases what happens? Pixel size decreases (Lange Q&A p.178 )
What can distortion be caused by? Tube angle, the position of the organ or structure within the body, and the radiographic positioning of the part (Lange Q&A p.178 )
Decreasing field size from 14x17 inches to 8x10 inches, with no changes will? Decrease the amount of scattered radiation generated within the part (Lange Q&A p.178 )
Reduction in x-ray photon intensity as it passes through numerous tissue densities is termed Attenuation (Lange Q&A p.179 )
Scattered radiation can impact the image negatively, but has no effect on Spatial Resolution (Lange Q&A p.179 )
The material comprising the IP front must be Homogeneous/ radiolucent (Lange Q&A p.180 )
OID is related to image sharpness/ spatial resolution in which of the following ways? Sharpness/ resolution is inversely related to OID (Lange Q&A p.180 )
The purpose of the electroconductive layer of a CR-PSP plate is to Facilitate transportation through the scanner/reader (Lange Q&A p.180 )
What pixel has a 2048x2048 matrix with a 60cm FOV? -0.3mm (Lange Q&A p.180 )
As window width increases what happens? Brightness decreases (Lange Q&A p.180 )
Ionizing radiation intensity decreases as Distance from the source of radiation increases (Lange Q&A p.180 )
The radiographic accessory used to measure the thickness of body parts to determine optimal selection of exposure factors is the Caliper (Lange Q&A p.181 )
The x-ray image is seen on the computer display monitor is a/an Analog image (Lange Q&A p.181 )
A radiograph made with a parallel grid demonstrated decreased receptor exposure on its lateral edges. This is most likely due to what? Decreased SID (Lange Q&A p.181 )
As digital detector element (DEL) size decreases Spatial resolution increases (Lange Q&A p.182 )
An increase in kilovoltage will serve to Increase photon energy (Lange Q&A p.182 )
The maximum spatial resolution in digital imaging is equal to the Nyquist frequency, which is 1/2 x the pixel pitch (mm) (Lange Q&A p.183 )
The processing algorith represents the Anatomical part and projection (Lange Q&A p.183 )
The relationship between the height of a grid's lead strips and the distance between them is called grid Ratio (Lange Q&A p. 183)
What are advantages of high kilovoltage chest radiography? Reduces patient dose & exposure time can be shorter (Lange Q&A p.183 )
The line-focus principle expresses the relationship between what? The actual and the effective focal spot (Lange Q&A p.184 )
Why is a short exposure time essential in chest radiography? To imimize involuntary motion (Lange Q&A p.185 )
The term windowing describes the practice of Changing the image brightness and/or contrast scale(Lange Q&A p.186 )
In digital imaging, thin film transistor (TFT) and detector element (DEL) size is related to Spatial resolution (Lange Q&A p.186 )
A compensating filter is used to Even out widely differing tissue densities (Lange Q&A p.187 )
The ratio of the pixel's sensing area to the area of the pixel itself refers to Fill factor (Lange Q&A p.187 )
Created by: 18Fieldsms
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