Exam (elaborations)
DQE and MTF.
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- 126 MTTC English As A Second Language
Exam of 3 pages for the course 126 MTTC English as a Second Language at 126 MTTC English as a Second Language (DQE and MTF.)
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DQE and MTFWhat does DQE stand for? - ANS-detective quantum efficiency
Detective Quantum Efficiency (DQE) is a: - ANS-Score that describes the ability of the
imaging system to convert the remnant x-ray beam into a high-quality image
Photon is synonymous with which of the following terms? - ANS-quantum
Which of the following will result in a system with high DQE? - ANS-There is a high
efficiency in converting the x-ray signal into an image; a lower x-ray signal is required to
produce a quality image
When a radiograph has a high DQE, what combination of noise and signal will be
demonstrated? - ANS-high signal, low noise
Which percentage would be considered the highest DQE? - ANS-80%
Which term describes the amount of photons that are absorbed by the detector? -
ANS-Capture efficiency
Which of the following would decrease DQE? - ANS-increasing kVp
Which of the following increases DQE? - ANS-Decreasing kVp
What does MTF stand for? - ANS-modulation transfer function
The MTF evaluates the: - ANS-Ability of the system to transfer the information into the
image
MTF is also referred to as? - ANS-image fidelity
Which MTF score indicates that an image perfectly represents the object in both spatial
resolution and contrast? - ANS-1.0
What unit is used to express spatial frequency? - ANS-Line pairs per mm
Which of the following line pairs per mm would represent the highest spatial frequency?
- ANS-9 lp/mm
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