RADT 1085 Unit 5 Test Questions and Answers All Correct
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Course
RADT 1085
Institution
RADT 1085
RADT 1085 Unit 5 Test Questions and Answers All Correct
Fluoroscopic Image Quality: Quantum Mottle - Answer-Blotchy, grainy appearance
Caused by insufficient radiation
Most common solution is to increase fluoro
tube mA
Advantages of FPIR over II-CCD: - Answer-• Less image distortion.
...
RADT 1085 Unit 5 Test Questions
and Answers All Correct
Fluoroscopic Image Quality: Quantum Mottle - Answer-Blotchy, grainy appearance
Caused by insufficient radiation
Most common solution is to increase fluoro
tube mA
Advantages of FPIR over II-CCD: - Answer-• Less image distortion.
• Constant image quality over entire image.
• Improved contrast resolution.
• Rectangular image area coupled to similar
image monitor.
CCD converts - Answer-light pattern to electrical signal
Direct Capture - Amorphous Selenium System - Answer-- X-rays directly interact with
amorphous selenium
(photoconductor)
- No phosphor, so no light spread.
- Better spatial resolution
As focal point gets closer to input phosphor, .. - Answer-the size of the area of the input
phosphor decreases
Magnification mode results in: - Answer-• Better spatial resolution
• Better contrast resolution
• higher patient dose
- More x-rays per unit area are required
• "Mag Down" - Answer-- Few lp/mm (poorer spatial resolution)
- Poorer contrast resolution
- Less patient dose
Indirect - Cesium Iodide/Amorphous Sliicon - Answer-X-ray energy converted into
visible light in
scintillator layer.
• Light is converted into electrical charges by an
array of amorphous silicon photodiodes
• Read out by a TFT array.
Both Direct Capture Radiography Systems(CCD with amorphous silicon or Amorphous
Selenium) consist of - Answer-an (AMA) Active Matrix Array of detectors.
Pixel Pitch - Answer-Distance between the center of one DEL and the
center of the adjacent DEL
Smaller Pixel Size in a fixed receptor size = - Answer-Larger Matrix
Fluoroscopic Image Intensifier •Image Intensifier (II) was developed in - Answer-1948
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