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Image Acquisition

QuestionAnswer
The component of a CR image plate that records the radiologic image is photostimulable phospor
the luminescent light emitted by the PSP is transformed into the image seen on the CRT by the ADC (analog to digital converter)
SId affects recorded detail in which of the following ways? directly related
Grid interspace material is made up of what? Aluminum and plastic fiber
In a duration of 0.05 second was selected for an exposure what mA would be necessary to produce 30 mAs? 600 mA
Unopened boxes of radiographic film should be stored away from radiation and in the vertical position
The term windowing describes the practice of changing the image brightness and/or contrast scale
foreshortening can be caused by the radiographic object being placed at an angle to the IR
what does not affect the exposure rate of the primary beam? field size
a patient with Congestive heart failure has to have what done to the technique for a PA chest Xray? Increase
Misalignment of the tube-part-IR relationship results in shape distortion
the direction of electron travel in the xray tube is cathode to anode
for the same FOV the spatial resolution will be improved using a larger matrix
which of the following technical change would best serve to remedy the effect of very dissimilar tissue densities high KV exposure factors
the absorption of useful radiation by a grid is called grid cutoff
during CR imaging, the latent image present on the PSP is changed to a computerized image by the ADC
How are mAs and patient dose related? directly
the reduction in xray photon intensity as the photon passes through material is termed attenuation
diagnostic xrays are generally associated with high frequency and short wavelength
At what portion of the xray beam is the effective focal spot the largest? at the cathode end
the intensity of ionizing radiation decreases as distance from the source of radiation increases
what is the purpose of the thin layer of lead that is often location in the rear portion of the IP to prevent scatter radiation
the purpose of the electroconductive layer of the CR PSP plate is to facilitate transportation through the scanner/reader
the xray image seen on the computer display monitor is a digital image
the accessory used to measure the thickness of body parts in order to determine optimal selection of exposure factors is the caliper
a radiograph made with a parallel grid demonstrates decreased density on its lateral edges. this is most likely due to decreased SID
a particular mAs value, regardless of the combination of the mA and time, will reproduce the same radiographic density, this is a statement of the reciprocity law
the relationship between the height of a grid's lead strips and the distance between them is referred to as grid ratio
because of the anode heel effect the intensity of the xray beam is greatest along the cathode end of the beam
in digital imaging, TFT DEL size is related to spatial resolution
Created by: jfwoodard