Question 1

Please match the following units of dose measurement. All answer selections will be used just once.

-rem

Accepted Answer

A) Old unit of effective dose 
B) Conventional unit of exposure 
C) Old unit of absorbed dose 
D) SI unit of effective dose 
E) SI unit of absorbed dose 
A) Old unit of effective dose 
B) Conventional unit of exposure 
C) Old unit of absorbed dose 
D) SI unit of effective dose 
E) SI unit of absorbed dose

Question 2

What is the purpose of the use of bowtie filters in CT?

Accepted Answer

A)  Increase scan time 
B)  Increase patient exposure 
C)  Shape the beam intensity 
D)  Ensure correct patient centering 
A)  Increase scan time 
B)  Increase patient exposure 
C)  Shape the beam intensity 
D)  Ensure correct patient centering

Question 3

What is the term used to describe the instrumentation and methods used to measure patient dose from a CT scanner?

Accepted Answer

A)  CT dosimetry 
B)  CT absorptiometry 
C)  Radiation intensity 
D)  Dose distribution 
A)  CT dosimetry 
B)  CT absorptiometry 
C)  Radiation intensity 
D)  Dose distribution

Question 4

If a technologist decreases slice thickness by a factor of two, he/she would need to increase dose by a factor of ______ to keep noise constant.

Accepted Answer

A)  two 
B)  four 
C)  eight 
D)  sixteen 
A)  two 
B)  four 
C)  eight 
D)  sixteen

Question 5

Stochastic effects are those effects for which the probability of the effect occurring depends on the dose.

Accepted Answer

A) True 
 B)False

Question 6

The old unit of effective dose was the rad.

Accepted Answer

A) True 
 B)False

Question 7

What dose-response model is a radiation risk model most favored by radiobiologists in estimating the risk of exposure in radiology?

Accepted Answer

A)  Linear threshold 
B)  Linear nonthreshold (LNT) 
C)  Nonlinear threshold 
D)  Nonlinear nonthreshold 
A)  Linear threshold 
B)  Linear nonthreshold (LNT) 
C)  Nonlinear threshold 
D)  Nonlinear nonthreshold

Question 8

Iterative reconstruction algorithms have proven beneficial in dose reduction in each of these CT exams except:

Accepted Answer

A)  pediatric studies. 
B)  abdominal examinations. 
C)  brain perfusion imaging. 
D)  CT angiography. 
A)  pediatric studies. 
B)  abdominal examinations. 
C)  brain perfusion imaging. 
D)  CT angiography.

Question 9

The principle of _____________ refers to the reduction of the radiation dose while maintaining the required image quality needed for making a diagnosis.

Accepted Answer

A)  as low as reasonably achievable 
B)  collimation 
C)  optimization 
D)  shielding 
A)  as low as reasonably achievable 
B)  collimation 
C)  optimization 
D)  shielding

Question 10

Please match the following units of dose measurement. All answer selections will be used just once.

-rad

Accepted Answer

A) Old unit of effective dose 
B) Conventional unit of exposure 
C) Old unit of absorbed dose 
D) SI unit of effective dose 
E) SI unit of absorbed dose 
A) Old unit of effective dose 
B) Conventional unit of exposure 
C) Old unit of absorbed dose 
D) SI unit of effective dose 
E) SI unit of absorbed dose

Question 11

The DLP is directly proportional to the scan length.

Accepted Answer

A) True 
 B)False

Question 12

What is the process by which additional rotations before and after the planned length are taken?

Accepted Answer

A)  z-overscanning 
B)  Doubling scan 
C)  Tripling scan 
D)  Over-rotating 
A)  z-overscanning 
B)  Doubling scan 
C)  Tripling scan 
D)  Over-rotating

Question 13

Phantoms are not used for the process of CT dose measurement.

Accepted Answer

A) True 
 B)False

Question 14

Each of the following are types of dosimeters that have previously been used to measure dose in CT except:

Accepted Answer

A)  film dosimeter. 
B)  electrometer. 
C)  thermoluminescent dosimeter (TL
D) . 
D)  ionization chamber. 
A)  film dosimeter. 
B)  electrometer. 
C)  thermoluminescent dosimeter (TL
D) . 
D)  ionization chamber.

Please match the following units of dose measurement. All answer selections will be used just once. -rem

What is the purpose of the use of bowtie filters in CT?

What is the term used to describe the instrumentation and methods used to measure patient dose from a CT scanner?

If a technologist decreases slice thickness by a factor of two, he/she would need to increase dose by a factor of ______ to keep noise constant.

Stochastic effects are those effects for which the probability of the effect occurring depends on the dose.

The old unit of effective dose was the rad.

What dose-response model is a radiation risk model most favored by radiobiologists in estimating the risk of exposure in radiology?

Iterative reconstruction algorithms have proven beneficial in dose reduction in each of these CT exams except:

The principle of _____________ refers to the reduction of the radiation dose while maintaining the required image quality needed for making a diagnosis.

Please match the following units of dose measurement. All answer selections will be used just once. -rad

The DLP is directly proportional to the scan length.

What is the process by which additional rotations before and after the planned length are taken?

Phantoms are not used for the process of CT dose measurement.

Each of the following are types of dosimeters that have previously been used to measure dose in CT except:

Computed Tomography: an Overview

Digital Image Processing

Physical Principles of Computed Tomography

Data Acquisition Concepts

Image Reconstruction

Iterative Reconstruction Basics

Basic Instrumentation

Image Postprocessing and Visualization Tools

Image Quality

Multislice Computed Tomography: Physical Principles and Instrumentation

Other Technical Applications of Computed Tomography Imaging: Basic Principles

Three-Dimensional Computed Tomography: Basic Concepts

Positron Emission Tomographyct Petct and Single-Photon Emission Computed Tomographyct Spectct Hybrid Scanners

Computed Tomography of the Head, Cerebral Vessels, Neck, and Spine

Computed Tomography of the Body

Pediatric Computed Tomography

Quality Control for Computed Tomography Scanners

Filters

Exam 10: Radiation Dose in Computed Tomography

Please match the following units of dose measurement. All answer selections will be used just once. -rem

What is the purpose of the use of bowtie filters in CT?

What is the term used to describe the instrumentation and methods used to measure patient dose from a CT scanner?

If a technologist decreases slice thickness by a factor of two, he/she would need to increase dose by a factor of ______ to keep noise constant.

Stochastic effects are those effects for which the probability of the effect occurring depends on the dose.

The old unit of effective dose was the rad.

What dose-response model is a radiation risk model most favored by radiobiologists in estimating the risk of exposure in radiology?

Iterative reconstruction algorithms have proven beneficial in dose reduction in each of these CT exams except:

The principle of _____________ refers to the reduction of the radiation dose while maintaining the required image quality needed for making a diagnosis.

Please match the following units of dose measurement. All answer selections will be used just once. -rad

The DLP is directly proportional to the scan length.

What is the process by which additional rotations before and after the planned length are taken?

Phantoms are not used for the process of CT dose measurement.

Each of the following are types of dosimeters that have previously been used to measure dose in CT except:

Computed Tomography: an Overview

Digital Image Processing

Physical Principles of Computed Tomography

Data Acquisition Concepts

Image Reconstruction

Iterative Reconstruction Basics

Basic Instrumentation

Image Postprocessing and Visualization Tools

Image Quality

Multislice Computed Tomography: Physical Principles and Instrumentation

Other Technical Applications of Computed Tomography Imaging: Basic Principles

Three-Dimensional Computed Tomography: Basic Concepts

Positron Emission Tomographyct Petct and Single-Photon Emission Computed Tomographyct Spectct Hybrid Scanners

Computed Tomography of the Head, Cerebral Vessels, Neck, and Spine

Computed Tomography of the Body

Pediatric Computed Tomography

Quality Control for Computed Tomography Scanners

Filters