Question 1

In digital radiography,the brightness of the image is determined by _____.

Accepted Answer

A)  pixel values 
B)  Hounsfield units 
C)  automatic brightness control 
D)  film contrast 
A)  pixel values 
B)  Hounsfield units 
C)  automatic brightness control 
D)  film contrast A

Question 2

Digital imaging techniques are always applied to _____.

Accepted Answer

A)  computed tomography (CT) 
B)  ultrasound 
C)  magnetic resonance imaging 
D)  all of the above 
A)  computed tomography (CT) 
B)  ultrasound 
C)  magnetic resonance imaging 
D)  all of the above D

Question 3

Conventional x-ray tubes and cassettes are used with _____ radiography systems.

Accepted Answer

A)  computed 
B)  scanned projection 
C)  direct capture 
D)  all of the above 
A)  computed 
B)  scanned projection 
C)  direct capture 
D)  all of the above A

Question 4

In scanned beam radiography,the spatial resolution is determined by the _____.

Accepted Answer

A)  number of detectors 
B)  width of the beam 
C)  semiconductor material 
D)  translation speed 
A)  number of detectors 
B)  width of the beam 
C)  semiconductor material 
D)  translation speed

Question 5

Scanned projection radiography differs from conventional radiography in the lack of _____.

Accepted Answer

A)  patient motion 
B)  spatial resolution 
C)  contrast resolution 
D)  scattered x-rays 
A)  patient motion 
B)  spatial resolution 
C)  contrast resolution 
D)  scattered x-rays

Question 6

Digital radiography first began to be used in clinical settings in the _____.

Accepted Answer

A)  1960s 
B)  1970s 
C)  1980s 
D)  1990s 
A)  1960s 
B)  1970s 
C)  1980s 
D)  1990s

Question 7

In digital fluoroscopy,each matrix pixel represents _____.

Accepted Answer

A)  interface reflectivity 
B)  atomic number and mass density 
C)  proton density and spin relaxation 
D)  radionuclide uptake 
A)  interface reflectivity 
B)  atomic number and mass density 
C)  proton density and spin relaxation 
D)  radionuclide uptake

Question 8

Spatial resolution is determined by the ratio of _____ to _____.

Accepted Answer

A)  matrix size, field of view 
B)  field of view, matrix size 
C)  bit depth, field of view 
D)  field of view, dynamic range 
A)  matrix size, field of view 
B)  field of view, matrix size 
C)  bit depth, field of view 
D)  field of view, dynamic range

Question 9

The primary limitation of fanned beam radiography is _____.

Accepted Answer

A)  reduced spatial resolution 
B)  long scanning time 
C)  low contrast resolution 
D)  shortened dynamic range 
A)  reduced spatial resolution 
B)  long scanning time 
C)  low contrast resolution 
D)  shortened dynamic range

Question 10

Scanned projection radiography was developed as a complement to _____.

Accepted Answer

A)  plain film radiography 
B)  computerized tomography 
C)  magnetic resonance imaging 
D)  nuclear medicine 
A)  plain film radiography 
B)  computerized tomography 
C)  magnetic resonance imaging 
D)  nuclear medicine

Question 11

In digital radiography,spatial resolution is improved with increased _____.

Accepted Answer

A)  field of view 
B)  Hounsfield units 
C)  pixel size 
D)  matrix size 
A)  field of view 
B)  Hounsfield units 
C)  pixel size 
D)  matrix size

Question 12

Digital imaging could only be developed after advances were made in _____.

Accepted Answer

A)  microprocessors 
B)  semiconductor memory 
C)  photostimulable phosphors 
D)  both A and B 
A)  microprocessors 
B)  semiconductor memory 
C)  photostimulable phosphors 
D)  both A and B

Question 13

Computed radiography developed in the 1970s with the use of _____ as the image receptor.

Accepted Answer

A)  phosphor 
B)  selenium 
C)  silicon 
D)  film 
A)  phosphor 
B)  selenium 
C)  silicon 
D)  film

Question 14

In digital radiography,the latent image is formed on the _____.

Accepted Answer

A)  radiographic film 
B)  image matrix 
C)  radiation detector 
D)  computer screen 
A)  radiographic film 
B)  image matrix 
C)  radiation detector 
D)  computer screen

Question 15

The dynamic range determines the degree of _____ in the image.

Accepted Answer

A)  contrast resolution 
B)  spatial resolution 
C)  motion blur 
D)  all of the above 
A)  contrast resolution 
B)  spatial resolution 
C)  motion blur 
D)  all of the above

Question 16

Computed radiography uses (a)_____ for latent image formation.

Accepted Answer

A)  thin film transistors 
B)  photosensitive silicon chips 
C)  photostimulable phosphor 
D)  semiconductor material 
A)  thin film transistors 
B)  photosensitive silicon chips 
C)  photostimulable phosphor 
D)  semiconductor material

Question 17

What is the most recent development in digital radiography image receptors?

Accepted Answer

A)  fanned x-ray beams 
B)  linear array radiation detectors 
C)  photostimulable phosphors 
D)  direct capture solid-state devices 
A)  fanned x-ray beams 
B)  linear array radiation detectors 
C)  photostimulable phosphors 
D)  direct capture solid-state devices

Exam 16: Digital Radiography

In digital radiography,the brightness of the image is determined by _____.

Digital imaging techniques are always applied to _____.

Conventional x-ray tubes and cassettes are used with _____ radiography systems.

In scanned beam radiography,the spatial resolution is determined by the _____.

Scanned projection radiography differs from conventional radiography in the lack of _____.

Digital radiography first began to be used in clinical settings in the _____.

In digital fluoroscopy,each matrix pixel represents _____.

Spatial resolution is determined by the ratio of _____ to _____.

The primary limitation of fanned beam radiography is _____.

Scanned projection radiography was developed as a complement to _____.

In digital radiography,spatial resolution is improved with increased _____.

Digital imaging could only be developed after advances were made in _____.

Computed radiography developed in the 1970s with the use of _____ as the image receptor.

In digital radiography,the latent image is formed on the _____.

The dynamic range determines the degree of _____ in the image.

Computed radiography uses (a)_____ for latent image formation.

What is the most recent development in digital radiography image receptors?

Essential Concepts of Radiologic Science

The Structure of Matter

Electromagnetic Energy

Electricity, Magnetism, and Electromagnetism

The X-ray Imaging System

The X-ray Tube

X-ray Production

X-ray Emission

X-ray Interaction with Matter

Concepts of Radiographic Image Quality

Control of Scatter Radiation

Screen-Film Radiography

Screen-Film Radiographic Technique

Computers in Medical Imaging

Computed Radiography

Digital Radiographic Technique

Viewing the Digital Radiographic Image

Screen-Film Radiographic Artifacts

Screen-Film Radiographic Quality Control

Digital Radiographic Artifacts

Digital Radiographic Quality Control

Mammography

Mammography Quality Control

Fluoroscopy

Digital Fluoroscopy

Interventional Radiography

Computed Tomography

Human Biology

Fundamental Principles of Radiobiology

Molecular Radiobiology

Cellular Radiobiology

Deterministic Effects of Radiation

Stochastic Effects of Radiation

Health Physics

Designing for Radiation Protection

Patient Radiation Dose Management

Occupational Radiation Dose Management

Filters

Spatial resolution is determined by the ratio of _ to _.