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Image Acq. & Eval

QuestionAnswer
What is the single most important way to reduce the production of scatter radiation? restricting the size of the x-ray field (Lange Radiography Prep Book, pg. 310)
What is the main function of a grid? absorb a large percentage of scatter radiation before it reaches the IR (Lange Radiography Prep Book, pg. 310)
What is a focused grid? grid with lead strips that are angled (Lange Radiography Prep Book, pg 312)
What is a crossed grid? grid that has another set of lead strips perpendicular to the first and prohibits the ability to angle the tube against them (Lange Radiography Prep Book, pg. 314)
How do you determine grid ratio? height of lead strip divided by the width of the interspace material (Lange Radiography Prep Book, pg. 314)
What is the total filtration of the primary beam suppose to be? 2.5mm Al (Lange Radiolgraphy Prep Book, pg. 317)
What is considered inherent filtration? glass envelope and collimator (Lange Radiography Prep Book, pg. 317)
What is considered added filtration? manufacturer determined if machine is using above 70 kVp (Lange Radiography Prep Book, pg. 317)
What is the purpose of the anode heel effect? placing the thicker body portion under the cathode end of the x-ray beam where the intensity is strongest (Lange Radiography Prep Book, pg. 319)
When would you use a trough filter? chest radiography (Lange Radiographyt Prep Book, pg. 328)
Long scale of contrast shows displays what? many similar image/ tissue densities that uses a higher kVp and larger field sizes (Lange Radiography Prep Book, pg. 338)
Short scale of contrast displays what? few, very different image/tissue densities that uses lower kVp and more "tigher" collimation (Lange Radiography Prep Book, pg. 338)
mAs controls what on a radiographic images? density (Lange Radiogaphy Prep Book, pg. 340)
T/F: the scale of contrast is controlled by mAs? False- kVp (Lange Radiography Prep Book, pg. 340)
kVp controls what? contrast (Lange Radiography Prep Book, pg. 340)
What are the two types of AEC and where are they located? ionization chamber: beneth the table top, above the IR phototimer: fluorescent screen underneath the IR (Lange Radiography Prep Book, pg. 351)
The result of poor patient positioning using AEC will produce what type of image? underexposed (Lange Radiography Prep Book, pg. 351)
If you increase the focal spot size, what does it do to your blur and detail? blur increases and detail decreases (Lange Radiography Prep Book, pg. 367)
The effective focal spot size is always _____ than the actual focal spot size. smaller (Lange Radiography Prep Book, pg. 367)
What is a LUT? matches the anatomic being imaged and functions to manipulate grayscale values to provide the appropriate grayscale (Lange Radiography Prep Book, pg. 397)
Bit depth determines what? grayscale (Lange Radiography Prep Book, pg. 334)
Spacial resolution increases with __ pixel size, ___ pixel pitch, ____image matrix small, small, large (Lange Radiography Prep Book, pg. 355)
What factors affect spacial resolution? OID, SID, focal spot size, patient body habitus, and motion (Lange Radiography Prep Book, pg. 358)
What part of this film processing converts the latent image into a manifest image? developer (Lange Review Radiography Prep Book, pg. 402)
Window width controls what? number of shades of grey (Lange Radiography Prep Book, pg. 377)
Window level controls what? brightness (Lange Radiography Prep Book, pg 377)
What system is a true indirect flat panel system? TFT (Lange Radiography Prep Book, pg. 378)
How are x-rays converted in indirect systems? x-rays are converted to light and then converted to electronic signal (Lange Radiography Prep Book, pg. 378)
How are x-rays converted in direct systems? x-rays are directly converted into electronic signal (Lange Radiography Prep Book, pg 378)
What is the scintillator composed of in a TFT indirect system? CsI or Gd2O2S (Lange Radiography Prep Book, pg. 378)
Created by: jmjones3