LRA 221 Quizzes With Complete
Solutions
Scintillators are phosphors that
| | |
Produce light when absorbing X-rays
| | | |
A device that includes photosensititive array and small pixels that
| | | | | | | | | |
convert light into electrical charges is known as a ____ translator.
| | | | | | | | | |
a. Thin field
| |
b. Field-effect
|
c. Thin-film
|
d. Field-energy
|
Thin-film
in a flat panel detector, specialized silicon integrated circuits control
| | | | | | | | |
a. Line scanning sequences
| | |
b. readout
|
c. amplification
|
,d. analog-to-digital conversion
| |
Line scanning sequences
| |
Which of the following is used as a photoconductor
| | | | | | | |
a. Gd2O2S
|
b. a-Se
|
c. a-Si:h
|
Cesium Iodide |
a-Se
Which of the following is not considered a scintillator?
| | | | | | | |
a. Gd2O2S
|
b. Csl
|
c. a-Se
|
d. None of the above
| | | |
a-Se
Flat-panel detectors that use indirect conversion technology convert
| | | | | | |
,a. electrical signals to light.
| | | |
b. light to x-rays
| | |
c. x-rays to electrical signals
| | | |
d. X-rays to visible light
| | | |
x-rays to visible light
| | |
Indirect conversion in flat-panel detectors is a ____-step process.
| | | | | | | |
a. one
|
b. two
|
c. three
|
d. four
|
two
Detector performance is measured with all of the following except:
| | | | | | | | |
a. spatial resolution
| |
b. observation of flow contrast objects in a phantom
| | | | | | | |
c. DQE
|
d. contrast
|
contrast
, Possible causes of image lag include all except
| | | | | | |
a. rapid succession images
| | |
b. over exposure
| |
c. lack of beam attenuation
| | | |
d. underexposure
|
underexposure
All of the following statements are true EXCEPT:
| | | | | | |
a. as the detector ages, the number of dead pixels increases
| | | | | | | | | |
b. software programs identify and isolate dead pixels
| | | | | | |
c. interpolation uses information from surrounding pixels
| | | | | |
d. Dead pixels at the edge of the detector are easily identified
| | | | | | | | | | |
Dead pixels at the edge of the detector are easily identified
| | | | | | | | | |
The absorption material can be attached to the pixel array electrically or
| | | | | | | | | | |
physically.
|
true or false | |
Solutions
Scintillators are phosphors that
| | |
Produce light when absorbing X-rays
| | | |
A device that includes photosensititive array and small pixels that
| | | | | | | | | |
convert light into electrical charges is known as a ____ translator.
| | | | | | | | | |
a. Thin field
| |
b. Field-effect
|
c. Thin-film
|
d. Field-energy
|
Thin-film
in a flat panel detector, specialized silicon integrated circuits control
| | | | | | | | |
a. Line scanning sequences
| | |
b. readout
|
c. amplification
|
,d. analog-to-digital conversion
| |
Line scanning sequences
| |
Which of the following is used as a photoconductor
| | | | | | | |
a. Gd2O2S
|
b. a-Se
|
c. a-Si:h
|
Cesium Iodide |
a-Se
Which of the following is not considered a scintillator?
| | | | | | | |
a. Gd2O2S
|
b. Csl
|
c. a-Se
|
d. None of the above
| | | |
a-Se
Flat-panel detectors that use indirect conversion technology convert
| | | | | | |
,a. electrical signals to light.
| | | |
b. light to x-rays
| | |
c. x-rays to electrical signals
| | | |
d. X-rays to visible light
| | | |
x-rays to visible light
| | |
Indirect conversion in flat-panel detectors is a ____-step process.
| | | | | | | |
a. one
|
b. two
|
c. three
|
d. four
|
two
Detector performance is measured with all of the following except:
| | | | | | | | |
a. spatial resolution
| |
b. observation of flow contrast objects in a phantom
| | | | | | | |
c. DQE
|
d. contrast
|
contrast
, Possible causes of image lag include all except
| | | | | | |
a. rapid succession images
| | |
b. over exposure
| |
c. lack of beam attenuation
| | | |
d. underexposure
|
underexposure
All of the following statements are true EXCEPT:
| | | | | | |
a. as the detector ages, the number of dead pixels increases
| | | | | | | | | |
b. software programs identify and isolate dead pixels
| | | | | | |
c. interpolation uses information from surrounding pixels
| | | | | |
d. Dead pixels at the edge of the detector are easily identified
| | | | | | | | | | |
Dead pixels at the edge of the detector are easily identified
| | | | | | | | | |
The absorption material can be attached to the pixel array electrically or
| | | | | | | | | | |
physically.
|
true or false | |
