How to Use This Resource
Table of Contents and List of Topics
Computed Tomography Image Quality and Dose Management
Mind Map
Outline and Learning Guide
Objectives and Learning Activities
Visuals for Class Discussions
Self-study Module
Online Textbook
Visuals For Class Discussions
To begin class discussion CLICK HERE
1
The Five Principle Characteristics of CT Images
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2
Image Quality Depends On The Selection of Protocol Factors
3
The Factors That Affect Blurring and Image Detail
4
The Dimensions of Each Ray Is Determined by the Size of the Detectors
5
Spiral Scanning
6
Increasing the Pitch Increases the Effective Width of the Beam and the Associated Blurring.
7
The Filter Algorithm Used To Decrease Noise Also Blurs The Image.
8
The Factors That Affect Noise in a CT Image
9
The Calculation of CT Numbers from Tissue Attenuation Coefficient Values
10
Photons Absorbed in Tissue Voxels
11
Reducing the Dose Increases the Noise
12
Noise Results From the Random Variation in the Number of Photons Absorbed in the Individual Voxels
13
Random Distribution of CT Numbers for a Region in an Image of Water
14
Scanning a Water Phantom Produces an Image Showing the Noise
15
Selecting The Filter Algorithm to Enhance Detail Increases the Noise
16
Dose is the Radiation Quantity that Expresses the Concentration of Radiation Energy Absorbed in the Tissue
17
The CTDI is the Special Quantity Used to Express Radiation Dose in CT
18
The Total Radiation Energy Deposited in the Body Depends on the Volume of Tissue Scanned
19
The Dose-Length-Product is a Practical Quantity for Expressing the Total Radiation Energy Deposited in the Body
20
Decreasing Slice Thickness (To Improve Detail) Will Require an Increased Dose to Maintain the Same Noise Level
21
Increasing Pitch Will Decrease Dose but Can Also Increase Blurring and Reduce Detail
22
Several Types of CT Image Artifacts
23
End of Module
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