Image Quality Review Flashcards
What image quality factor is defined as the structural sharpness recorded in the radiographic image?
spatial resolution
Increasing source to object distance does what to spatial resolution?
increases
What aspects of the image receptor IR influence spatial resolution?
size, pitch, number of detector elements (dexels)
What primarily controls the display monitor spatial resolution?
matrix size
How many shades of gray can one monitor pixel display at a time?
1
Which factor will produce a monitor capable of displaying greater spatial resolution?
large number of pixels
How many pixels are in a 2MP (megapixel) monitor?
2 million
What is the minimum size for a monitor recommended by the American College of Radiography (ACR) for routine radiography?
3MP
How is spatial resolution measured (unit)?
lp/mm (line pairs per millimeter)
What is used to test a monitor’s spatial resolution?
SMPTE test pattern
What does DQE stand for?
Detective Quantum Efficiency
Define DQE
score that describes the ability of the imaging system to convert the remnant x-ray beam into a high-quality image
quantum is synonymous with what?
photon
High efficiency in converting x-ray signal into an image and a lower xray signal is required to produce a quality image would result in a system with (high/low) DQE
high
When a radiograph has a high DQE, what combo of noise/signal will be demonstrated?
high signal and low noise
