Question 1

In a flat-panel detector, specialized silicon integrated circuits control:

Accepted Answer

A)  line scanning sequence. 
B)  readout. 
C)  amplification. 
D)  analog-to-digital conversion. 
A)  line scanning sequence. 
B)  readout. 
C)  amplification. 
D)  analog-to-digital conversion. A

Question 2

A device that includes a photosensitive array and small pixels that convert light into electrical charges is known as a ______ transistor.

Accepted Answer

A)  thin-field 
B)  field-effect 
C)  thin-film 
D)  field-energy 
A)  thin-field 
B)  field-effect 
C)  thin-film 
D)  field-energy C

Question 3

The absorption material can be attached to the pixel array electrically or physically.

Accepted Answer

A) True 
 B)False  True

Question 4

CsI detectors use:

Accepted Answer

A)  rare-earth scintillators. 
B)  thin crystalline needles. 
C)  miniature cameras. 
D)  specialized pixel sensors. 
A)  rare-earth scintillators. 
B)  thin crystalline needles. 
C)  miniature cameras. 
D)  specialized pixel sensors.

Question 5

The 2-D array determines whether the imager is direct conversion or indirect conversion.

Accepted Answer

A) True 
 B)False

Question 6

Photoconductors are materials that:

Accepted Answer

A)  produce light when absorbing x-rays. 
B)  produce x-rays when absorbing light. 
C)  absorb light and produce electric charges. 
D)  absorb x-rays and produce electrical charges. 
A)  produce light when absorbing x-rays. 
B)  produce x-rays when absorbing light. 
C)  absorb light and produce electric charges. 
D)  absorb x-rays and produce electrical charges.

Question 7

Which of the following can be done to decrease the chance of having image lag occur in the next image?

Accepted Answer

A)  Decrease the amount of time between exposures. 
B)  Increase the amount of time between exposures. 
C)  Leave collimation open. 
D)  Acquire the image requiring the highest technical factors first. 
A)  Decrease the amount of time between exposures. 
B)  Increase the amount of time between exposures. 
C)  Leave collimation open. 
D)  Acquire the image requiring the highest technical factors first.

Question 8

Indirect conversion in flat-panel detectors is a ____-step process.

Accepted Answer

A)  one 
B)  two 
C)  three 
D)  four 
A)  one 
B)  two 
C)  three 
D)  four

Question 9

Flat-panel detectors that use indirect conversion technology convert:

Accepted Answer

A)  electrical signals to light. 
B)  light to x-rays. 
C)  x-rays to electrical signals. 
D)  x-rays to visible light. 
A)  electrical signals to light. 
B)  light to x-rays. 
C)  x-rays to electrical signals. 
D)  x-rays to visible light.

Question 10

In CsI detectors:

Accepted Answer

A)  there is very little light spread. 
B)  crystalline needles block light from the detector. 
C)  x-rays are converted into an electrical signal. 
D)  light spread causes resolution to decrease. 
A)  there is very little light spread. 
B)  crystalline needles block light from the detector. 
C)  x-rays are converted into an electrical signal. 
D)  light spread causes resolution to decrease.

Question 11

Detector performance is measured with all of the following except:

Accepted Answer

A)  spatial resolution. 
B)  observation of flow contrast objects in a phantom. 
C)  DQE. 
D)  contrast. 
A)  spatial resolution. 
B)  observation of flow contrast objects in a phantom. 
C)  DQE. 
D)  contrast.

Question 12

Possible causes of image lag include all but:

Accepted Answer

A)  rapid succession images. 
B)  overexposure. 
C)  lack of beam attention. 
D)  underexposure. 
A)  rapid succession images. 
B)  overexposure. 
C)  lack of beam attention. 
D)  underexposure.

Question 13

A Gd2O2S scintillator is known as what type of phosphor?

Accepted Answer

A)  Turbid 
B)  Unstructured 
C)  Structured 
D)  Both a and b 
A)  Turbid 
B)  Unstructured 
C)  Structured 
D)  Both a and b

Question 14

Gain calibration will remove inherent detector artifacts from an image.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following is not considered a scintillator?

Accepted Answer

A)  Gd2O2S 
B)  CsI 
C)  a-Se 
D)  None of the above 
A)  Gd2O2S 
B)  CsI 
C)  a-Se 
D)  None of the above

Question 16

Manufacturers make efforts to maintain a standard of less than ________ defective pixels.

Accepted Answer

A)  0.01% to 0.02% 
B)  0.1% to 0.2% 
C)  1% to 2% 
D)  none of the above 
A)  0.01% to 0.02% 
B)  0.1% to 0.2% 
C)  1% to 2% 
D)  none of the above

Question 17

Amplifiers perform all of the following functions except:

Accepted Answer

A)  readout. 
B)  amplification. 
C)  noise cancelling. 
D)  analog-to-digital conversion. 
A)  readout. 
B)  amplification. 
C)  noise cancelling. 
D)  analog-to-digital conversion.

Question 18

Scintillators are phosphors that:

Accepted Answer

A)  produce light when absorbing x-rays. 
B)  produce x-rays when absorbing light. 
C)  absorb light and produce electrical charges. 
D)  absorb x-rays and produce electrical charges. 
A)  produce light when absorbing x-rays. 
B)  produce x-rays when absorbing light. 
C)  absorb light and produce electrical charges. 
D)  absorb x-rays and produce electrical charges.

Question 19

Offset correction is used to remove inherent signal that remains in a detector.

Accepted Answer

A) True 
 B)False

Question 20

Defective pixels can result from all of the following except:

Accepted Answer

A)  chemical corrosion. 
B)  static discharge. 
C)  software programs. 
D)  age. 
A)  chemical corrosion. 
B)  static discharge. 
C)  software programs. 
D)  age.

In a flat-panel detector, specialized silicon integrated circuits control:

A device that includes a photosensitive array and small pixels that convert light into electrical charges is known as a ______ transistor.

The absorption material can be attached to the pixel array electrically or physically.

CsI detectors use:

The 2-D array determines whether the imager is direct conversion or indirect conversion.

Photoconductors are materials that:

Which of the following can be done to decrease the chance of having image lag occur in the next image?

Indirect conversion in flat-panel detectors is a ____-step process.

Flat-panel detectors that use indirect conversion technology convert:

In CsI detectors:

Detector performance is measured with all of the following except:

Possible causes of image lag include all but:

A Gd₂O₂S scintillator is known as what type of phosphor?

Gain calibration will remove inherent detector artifacts from an image.

Which of the following is not considered a scintillator?

Manufacturers make efforts to maintain a standard of less than ________ defective pixels.

Amplifiers perform all of the following functions except:

Scintillators are phosphors that:

Offset correction is used to remove inherent signal that remains in a detector.

Defective pixels can result from all of the following except:

Introduction to Digital Radiography and Pacs

Digital Image Characteristics

Digital Radiographic Image Processing and Manipulation

Photostimulable Phosphor Image Capture

Ccdcmos Image Capture

Basic Computer Principles

Networking and Communications Basics

Pacs Fundamentals

Pacs Archiving and Peripherals

Ensuring Quality in Pacs

Quality Acceptance Testing Within Digital Projection Imaging

Filters

Exam 5: Tft Flat Panel Array Image Acquisition

In a flat-panel detector, specialized silicon integrated circuits control:

A device that includes a photosensitive array and small pixels that convert light into electrical charges is known as a ______ transistor.

The absorption material can be attached to the pixel array electrically or physically.

CsI detectors use:

The 2-D array determines whether the imager is direct conversion or indirect conversion.

Photoconductors are materials that:

Which of the following can be done to decrease the chance of having image lag occur in the next image?

Indirect conversion in flat-panel detectors is a ____-step process.

Flat-panel detectors that use indirect conversion technology convert:

In CsI detectors:

Detector performance is measured with all of the following except:

Possible causes of image lag include all but:

A Gd2O2S scintillator is known as what type of phosphor?

Gain calibration will remove inherent detector artifacts from an image.

Which of the following is not considered a scintillator?

Manufacturers make efforts to maintain a standard of less than ________ defective pixels.

Amplifiers perform all of the following functions except:

Scintillators are phosphors that:

Offset correction is used to remove inherent signal that remains in a detector.

Defective pixels can result from all of the following except:

Introduction to Digital Radiography and Pacs

Digital Image Characteristics

Digital Radiographic Image Processing and Manipulation

Photostimulable Phosphor Image Capture

Ccdcmos Image Capture

Basic Computer Principles

Networking and Communications Basics

Pacs Fundamentals

Pacs Archiving and Peripherals

Ensuring Quality in Pacs

Quality Acceptance Testing Within Digital Projection Imaging

Filters

A Gd₂O₂S scintillator is known as what type of phosphor?