March Manual No. 38616 Rev
AAPM MRI Phantoms
Nuclear Associates 76-907 and
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6045 Cochran Road Cleveland, Ohio
Radiation Management Services
Fluke Biomedical
Table of Contents
General Information
Operations
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1.1 Introduction
General Information
Section
1.2 Phantom Description
Figure 1-2. Resolution Block Detail
1.2.1 3D Resolution and Slice 3DRAS Phantom Model
Resolution Block Detail - 2 Required
Outer Shape 6 X 6 X 5 Cubical Box
Phantom Description
Figure 1-3. Resolution Sections in Three Imaging Planes
General Information
2 mm Gap 1 mm Gap 1 mm Gap
Operators Manual
1.2.2 Uniformity and Linearity UAL Phantom
Nuclear Associates
Figure 1-5. Slice Thickness Sections
Phantom Description
MR Phantom for Spatial Linearity, Signal-To-Noise, and Image Artifact
General Information
UAL Phantom
Operators Manual
The flood phantom has a uniform solution, the image of which can be used to measure the uniformity in signal intensity in the images. The grid section consists of grids that can be used to assess geometric linearity
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2.1 Phantom Preparation
2.1.1Signal Producing Solution
Operation
2.1.2Filling the Phantom
2.2.1 Positioning the Phantom
2.3 Tests with 3D Resolution and Slice 3DRAS Phantom
2.2 Preparation for Scanning
2.2.2 Scanning Parameters
Tests with 3D Resolution and Slice 3DRAS Phantom
2.3.2 Signal-To-Noise Ratio
2.3.3 High-Contrast Spatial Resolution
Operation
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2.3.4 Slice Thickness
2.3.5 Slice Position and Separation
Operators Manual
Operation
2.3.6 Example Images
Tests with 3D Resolution and Slice 3DRAS Phantom
Operators Manual
Figures 2-2 and 2-3 represent two adjacent sagital views of the phantom. The resolution holes are well resolved in vertical and horizontal direction and the two slices are 6 mm apart SP = 14.5 and 20.5. The slice thickness images of short vertical lines on top and bottom of the phantom image again are from the crossed hot ramps of 2 mm top and 1 mm bottom
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Tests with 3D Resolution and Slice 3DRAS Phantom
Operation
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Operators Manual
Operation
Tests with 3D Resolution and Slice 3DRAS Phantom
Figures 2-7 and 2-8 show an example of the slice thickness measurement analysis. A signal intensity profile is drawn vertically through a set of slice thickness ramp Images. The profile is the slice thickness profile. One can also obtain the slice thickness by measuring full width half maximum of the profile. Figure 2-8 represents the same data using a larger zoom factor
2.4.2 Spatial Linearity Distortion
2.4 Tests With Uniformity and Linearity UAL Phantom
2.4.1 Image Uniformity
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Tests with Uniformity and Linearity UAL Phantom
2.4.3 Image Artifacts
Operation
DC-Offset Errors
2.4.4 Action Criteria
2.4.5 Example Images
Receive Quadrature Errors
Operation
Tests with Uniformity and Linearity UAL Phantom
2-14
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Operators Manual
2-15
Operation
Tests with Uniformity and Linearity UAL Phantom
6045 Cochran Road Cleveland, Ohio
Radiation Management Services
Fluke Corporation
