Question 1

Which statement best describes a charge-coupled device (CCD)?

Accepted Answer

A)  It is the oldest direct conversion technology that is still in use today. 
B)  It is the oldest direct conversion technology with limited use today. 
C)  It is the oldest indirect conversion technology that is no longer used in medical imaging. 
D)  It is the oldest indirect conversion technology used in a variety of image capture applications. 
A)  It is the oldest direct conversion technology that is still in use today. 
B)  It is the oldest direct conversion technology with limited use today. 
C)  It is the oldest indirect conversion technology that is no longer used in medical imaging. 
D)  It is the oldest indirect conversion technology used in a variety of image capture applications. D

Question 2

Clinical applications for CCDs include all of the following except:

Accepted Answer

A)  digital fluoroscopy. 
B)  computed tomography fluoroscopy. 
C)  digital mammography. 
D)  general radiography. 
A)  digital fluoroscopy. 
B)  computed tomography fluoroscopy. 
C)  digital mammography. 
D)  general radiography. B

Question 3

Some advantages to CCDs include:

Accepted Answer

A)  less expensive to manufacture. 
B)  module design makes repairs and upgrades easy. 
C)  demagnification capabilities. 
D)  a and c only. 
E)  all of the above. 
A)  less expensive to manufacture. 
B)  module design makes repairs and upgrades easy. 
C)  demagnification capabilities. 
D)  a and c only. 
E)  all of the above. D

Question 4

CCDs use more power than CMOS.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following statements about scintillators is true?

Accepted Answer

A)  All scintillators absorb the same amount of x-ray photons. 
B)  The amount of x-rays absorbed depends on the type of scintillator. 
C)  Structured phosphors produce more light spread. 
D)  Unstructured phosphors are more efficient. 
A)  All scintillators absorb the same amount of x-ray photons. 
B)  The amount of x-rays absorbed depends on the type of scintillator. 
C)  Structured phosphors produce more light spread. 
D)  Unstructured phosphors are more efficient.

Question 6

All of the following are considered impurities except:

Accepted Answer

A)  gallium arsenide. 
B)  indium antimonide. 
C)  tellurium. 
D)  most metal oxides. 
A)  gallium arsenide. 
B)  indium antimonide. 
C)  tellurium. 
D)  most metal oxides.

Question 7

The polysilicon layer within a CCD acts as an insulator.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following flat-panel detector technologies was developed by NASA?

Accepted Answer

A)  CCD 
B)  Field-effect transistor 
C)  CMOS 
D)  Thin-field transistor 
A)  CCD 
B)  Field-effect transistor 
C)  CMOS 
D)  Thin-field transistor

Question 9

The most common types of noise that affect image quality include all of the following except:

Accepted Answer

A)  quantum noise. 
B)  statistical noise. 
C)  "dark" current noise. 
D)  amplification noise. 
A)  quantum noise. 
B)  statistical noise. 
C)  "dark" current noise. 
D)  amplification noise.

Question 10

Demagnification is:

Accepted Answer

A)  reducing the phosphor output image to the size of the active area of the CCD. 
B)  reducing the field size of the CCD detector. 
C)  reducing the amount of light spread from the scintillator. 
D)  none of the above. 
A)  reducing the phosphor output image to the size of the active area of the CCD. 
B)  reducing the field size of the CCD detector. 
C)  reducing the amount of light spread from the scintillator. 
D)  none of the above.

Question 11

Which of the following statements is true?

Accepted Answer

A)  Quantum efficiency and detective quantum efficiency are the same. 
B)  Quantum efficiency will affect detective quantum efficiency. 
C)  Quantum efficiency has no effect on detective quantum efficiency. 
D)  Quantum efficiency is the absolute efficiency of the amount of light collected. 
A)  Quantum efficiency and detective quantum efficiency are the same. 
B)  Quantum efficiency will affect detective quantum efficiency. 
C)  Quantum efficiency has no effect on detective quantum efficiency. 
D)  Quantum efficiency is the absolute efficiency of the amount of light collected.

Question 12

Detector elements are formed by voltage gates that _____ at readout to _____ the flow of electrons.

Accepted Answer

A)  close; allow 
B)  open; allow 
C)  close; stop 
D)  open; stop 
A)  close; allow 
B)  open; allow 
C)  close; stop 
D)  open; stop

Question 13

When compared with a CMOS, CCDs:

Accepted Answer

A)  are less light sensitive. 
B)  are more susceptible to noise. 
C)  use more than 100 times the power. 
D)  are inexpensive to manufacture. 
A)  are less light sensitive. 
B)  are more susceptible to noise. 
C)  use more than 100 times the power. 
D)  are inexpensive to manufacture.

Question 14

_______ turn semi-conductors into full electrical conductors.

Accepted Answer

A)  Dopants 
B)  Amplifiers 
C)  Positive transistors 
D)  Negative transistors 
A)  Dopants 
B)  Amplifiers 
C)  Positive transistors 
D)  Negative transistors

Question 15

A detector in which each pixel has its own amplifier is known as a:

Accepted Answer

A)  CCD. 
B)  field-effect transistor. 
C)  CMOS. 
D)  thin-field transistor. 
A)  CCD. 
B)  field-effect transistor. 
C)  CMOS. 
D)  thin-field transistor.

Question 16

The components that focus the signal from the scintillators to the CCD are called:

Accepted Answer

A)  detector elements. 
B)  capacitors. 
C)  fiber optics. 
D)  analog-digital converters. 
A)  detector elements. 
B)  capacitors. 
C)  fiber optics. 
D)  analog-digital converters.

Question 17

A device that acts like a camera in an indirect conversion detector is known as a:

Accepted Answer

A)  CCD. 
B)  field-effect transistor. 
C)  CMOS 
D)  thin-field transistor. 
A)  CCD. 
B)  field-effect transistor. 
C)  CMOS 
D)  thin-field transistor.

Question 18

When specialized pixels in a complementary metal oxide silicon system are struck with x-ray photons:

Accepted Answer

A)  the x-ray photons are converted into light. 
B)  light photons are stored in capacitors. 
C)  light photons are converted into electrical charges. 
D)  all of the above. 
A)  the x-ray photons are converted into light. 
B)  light photons are stored in capacitors. 
C)  light photons are converted into electrical charges. 
D)  all of the above.

Question 19

The indirect conversion detector system that requires optical coupling and image size reduction is known as a:

Accepted Answer

A)  CCD. 
B)  field-effect transistor. 
C)  CMOS. 
D)  thin-field transistor. 
A)  CCD. 
B)  field-effect transistor. 
C)  CMOS. 
D)  thin-field transistor.

Question 20

Quantum efficiency is a measurement of the:

Accepted Answer

A)  amount of electron-hole pairs held by the electrostatic force. 
B)  percentage of light that is absorbed. 
C)  amount of electrons produced relative to the incident light from the scintillator. 
D)  total amount of light that is absorbed. 
A)  amount of electron-hole pairs held by the electrostatic force. 
B)  percentage of light that is absorbed. 
C)  amount of electrons produced relative to the incident light from the scintillator. 
D)  total amount of light that is absorbed.

Which statement best describes a charge-coupled device (CCD)?

Clinical applications for CCDs include all of the following except:

Some advantages to CCDs include:

CCDs use more power than CMOS.

Which of the following statements about scintillators is true?

All of the following are considered impurities except:

The polysilicon layer within a CCD acts as an insulator.

Which of the following flat-panel detector technologies was developed by NASA?

The most common types of noise that affect image quality include all of the following except:

Demagnification is:

Which of the following statements is true?

Detector elements are formed by voltage gates that _ at readout to _ the flow of electrons.

When compared with a CMOS, CCDs:

_______ turn semi-conductors into full electrical conductors.

A detector in which each pixel has its own amplifier is known as a:

The components that focus the signal from the scintillators to the CCD are called:

A device that acts like a camera in an indirect conversion detector is known as a:

When specialized pixels in a complementary metal oxide silicon system are struck with x-ray photons:

The indirect conversion detector system that requires optical coupling and image size reduction is known as a:

Quantum efficiency is a measurement of the:

Introduction to Digital Radiography and Pacs

Digital Image Characteristics

Digital Radiographic Image Processing and Manipulation

Photostimulable Phosphor Image Capture

Tft Flat Panel Array Image Acquisition

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 6: Ccdcmos Image Capture

Which statement best describes a charge-coupled device (CCD)?

Clinical applications for CCDs include all of the following except:

Some advantages to CCDs include:

CCDs use more power than CMOS.

Which of the following statements about scintillators is true?

All of the following are considered impurities except:

The polysilicon layer within a CCD acts as an insulator.

Which of the following flat-panel detector technologies was developed by NASA?

The most common types of noise that affect image quality include all of the following except:

Demagnification is:

Which of the following statements is true?

Detector elements are formed by voltage gates that _____ at readout to _____ the flow of electrons.

When compared with a CMOS, CCDs:

_______ turn semi-conductors into full electrical conductors.

A detector in which each pixel has its own amplifier is known as a:

The components that focus the signal from the scintillators to the CCD are called:

A device that acts like a camera in an indirect conversion detector is known as a:

When specialized pixels in a complementary metal oxide silicon system are struck with x-ray photons:

The indirect conversion detector system that requires optical coupling and image size reduction is known as a:

Quantum efficiency is a measurement of the:

Introduction to Digital Radiography and Pacs

Digital Image Characteristics

Digital Radiographic Image Processing and Manipulation

Photostimulable Phosphor Image Capture

Tft Flat Panel Array Image Acquisition

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

Detector elements are formed by voltage gates that _ at readout to _ the flow of electrons.