COMPUTED RADIOGRAPHY AND DIGITAL
RADIOGRAPHY-STUDY GUIDE
2024 QUESTIONS AND CORRECT ANSWERS
ALREADY GRADED A+
The two general types of digital radiographic systems are what? - Answer-
Computed Radiography (CR) and Digital Radiography (DR).
Digital radiography (DR) systems use detectors that employ _____________ or
_____________ conversion processors. - Answer-Direct or indirect.
How many bits are required to form a byte? - Answer-8.
How do you figure how many pixels comprise a matrix? - Answer-You multiply
the columns and rows together.
The overall dimension of the image matrix is termed the _______________. -
Answer-Field Of View (FOV).
Large matrix = ________ pixels. - Answer-Small.
Small pixels = ________ resolution - Answer-Greater.
Spatial resolution is also known as: - Answer-Detail.
The range of shades of gray that can be displayed on the digital image is
determined by the ______________. - Answer-Grayscale bit depth.
The grayscale bit depth ranges from ____ to ____. - Answer-8 to 32.
The ____________ the bit depth, the more shades of gray there will be. - Answer-
Greater.
What are the 3 primary types of image processing operations? - Answer-
1. Histogram.
2. LUT.
3. Windowing.
, COMPUTED RADIOGRAPHY AND DIGITAL
RADIOGRAPHY-STUDY GUIDE
2024 QUESTIONS AND CORRECT ANSWERS
ALREADY GRADED A+
What does LUT stand for? - Answer-Look up Table.
What are the 3 types of noise that can affect a digital image? - Answer-
1. System noise.
2. Ambient noise.
3. Quantum Mottle.
Noise that does not affect the image: - Answer-System noise.
Noise that will affect the image, causing it to look foggy because of scatter: -
Answer-Ambient noise.
Noise that occurs when the incorrect use of kVp or mAs is used: - Answer-
Quantum Mottle.
SNR stands for: - Answer-Signal to Noise Ratio.
True or False:
You want more signal and low noise. - Answer-True.
What does DQE stand for? - Answer-Detective Quantum Efficiency.
A measure of the sensitivity and accuracy by which the IR converts the incoming
data to the out-put viewing device. - Answer-DQE.
The comparison of the actual exposure received by the IR and the proper exposure
that should have been received. - Answer-Deviation Index (DI).
CT was invented in ________. - Answer-1970.
CT stands for: - Answer-Computed Tomography.
RADIOGRAPHY-STUDY GUIDE
2024 QUESTIONS AND CORRECT ANSWERS
ALREADY GRADED A+
The two general types of digital radiographic systems are what? - Answer-
Computed Radiography (CR) and Digital Radiography (DR).
Digital radiography (DR) systems use detectors that employ _____________ or
_____________ conversion processors. - Answer-Direct or indirect.
How many bits are required to form a byte? - Answer-8.
How do you figure how many pixels comprise a matrix? - Answer-You multiply
the columns and rows together.
The overall dimension of the image matrix is termed the _______________. -
Answer-Field Of View (FOV).
Large matrix = ________ pixels. - Answer-Small.
Small pixels = ________ resolution - Answer-Greater.
Spatial resolution is also known as: - Answer-Detail.
The range of shades of gray that can be displayed on the digital image is
determined by the ______________. - Answer-Grayscale bit depth.
The grayscale bit depth ranges from ____ to ____. - Answer-8 to 32.
The ____________ the bit depth, the more shades of gray there will be. - Answer-
Greater.
What are the 3 primary types of image processing operations? - Answer-
1. Histogram.
2. LUT.
3. Windowing.
, COMPUTED RADIOGRAPHY AND DIGITAL
RADIOGRAPHY-STUDY GUIDE
2024 QUESTIONS AND CORRECT ANSWERS
ALREADY GRADED A+
What does LUT stand for? - Answer-Look up Table.
What are the 3 types of noise that can affect a digital image? - Answer-
1. System noise.
2. Ambient noise.
3. Quantum Mottle.
Noise that does not affect the image: - Answer-System noise.
Noise that will affect the image, causing it to look foggy because of scatter: -
Answer-Ambient noise.
Noise that occurs when the incorrect use of kVp or mAs is used: - Answer-
Quantum Mottle.
SNR stands for: - Answer-Signal to Noise Ratio.
True or False:
You want more signal and low noise. - Answer-True.
What does DQE stand for? - Answer-Detective Quantum Efficiency.
A measure of the sensitivity and accuracy by which the IR converts the incoming
data to the out-put viewing device. - Answer-DQE.
The comparison of the actual exposure received by the IR and the proper exposure
that should have been received. - Answer-Deviation Index (DI).
CT was invented in ________. - Answer-1970.
CT stands for: - Answer-Computed Tomography.
