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Digital Radiography Test

Enter the letter for the matching Definition
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1.
Turbid Powdered Phosphor
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2.
Image lag
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3.
Spatial Resolution
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4.
Flat fielding
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5.
Photodiode
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6.
photoconductor
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7.
Indirect Detector
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8.
light optics
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9.
Photodiode layer
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10.
one
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11.
detector elements
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12.
Thin Film Transistor
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13.
Signal noise ratio
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14.
size
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15.
high
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16.
Amorphous Silicon
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17.
Storage Capacitor
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18.
Turbid Powdered Unstructured Phosphor
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19.
Photoconductor
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20.
Fill Factor
A.
A perfect digital detector would have a DQE of __.
B.
The sensing/storage element of an indirect flat-panel TFT detector is the _______.
C.
The spatial resolution depends on the ____ of the pixels in the matrix.
D.
An array for readout of electrical charges generated by the photodiode layer in an indirect detector system, or by the storage capacitor from the photoconductor of the direct detector system.
E.
The light optics reduces the image quality by reducing the ______to_____ _____.
F.
A pre-processing technique properly referred to as system calibration that ensures detector performance integrity by removing artifacts.
G.
An Indirect detector has a layer of ______.
H.
The purpose of a a-Si ______ ______ is to convert the light from the x-ray detection scintillator into electrical charges.
I.
Detectors with ____ fill factors will provide better spatial and contrast resolutions.
J.
Gradolinium oxysulfide crystals are deposited as powdered particles in the photodiode array.
K.
The ratio of sensing area of the pixel to the area of the pixel itself.
L.
also known as memory effect;The persistence of an image in a flat-panel detector due to charge still being produced after the x-ray radiation beam has been turned off
M.
The sensing/storage element of a direct flat-panel TFT detector is the _____ ________ in the photoconductor.
N.
Which type of phosphor or scintillation screen causes lateral spreading of light and decreases the spatial resolution of the image?
O.
The _____ ______ in a CCD digital detector system reduces the output image from the scintillator phosphor to the size of the CCD array thereby reducing the image quality.
P.
The ability of an imaging system to resolve fine details present in an object. It's also referred to as the sharpness of the image.
Q.
The ______ in a direct digital detector system converts the x-ray to an electrical signal.
R.
The flat-panel TFT digital detector is designed as a matrix of ______ _______.
S.
The direct detectors use a a-Se ____________ to convert x-ray energy directly into electrical charges.
T.
A system that uses phosphors to convert x-ray energy into an electrical signal through an intermediate stage that utilizes light photons.
Type the Definition that corresponds to the displayed Term.
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21.
The _____ _______ operation is based on subtraction of images taken at different kVps.
Type the Term that corresponds to the displayed Definition.
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22.
_____________ operations address the appearance of the image displayed on a monitor for viewing and interpretation by a radiologist.
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23.
____________ operations deal with applying corrections to the raw data.
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24.
X-ray scintillators are CsI and Gradolinium oxysulfide for indirect flat-panel TFT detectors and a _______ for direct flat-panel TFT detectors.
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25.
The exposure latitude for digital detectors is much _____ compared to the film-screen receptors.
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26.
The response of the image receptor to the radiation falling upon it.
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27.
The ______ detects x-rays and converts them into light.
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28.
As spatial frequency increases, the MTF _______.
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29.
A system that uses photoconductors to convert x-ray energy directly into electrical charge without the intermediate stage.
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30.
The response of a detector to different levels of radiation exposure.

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