Article Figures & Data
Figures
- FIGURE 1.
Attenuation maps and corresponding 18F-AV-45 PET images for 2 representative subjects. No artifacts or obvious misregistration can be observed (QC 1).
- FIGURE 2.
Cumulative voxelwise relative differences between PET images obtained using 4 attenuation map generation methods and those generated using reference CT-based approach for 2 representative subjects (blue). Voxelwise relative differences are below 10% in at least 90% of voxels included in brain masks for Siemens skull model-based and GE ZTE-based approaches (QC 2). Percentage of voxels with absolute relative difference smaller than 10% is indicated in each case. Green line represents histogram of pixelwise percentage difference.
- FIGURE 3.
Bland–Altman plots of absolute relative differences between PET images obtained using 4 attenuation map generation methods and those generated using reference CT-based approach for study-specific FreeSurfer-based ROIs for 2 representative subjects. Average absolute percentage differences are below 10% in all study-specific ROIs for Siemens skull model-based and GE ZTE-based approaches (QC 3). CTAC = CT-based AC.
- FIGURE 4.
Cumulative voxelwise relative differences between PET images obtained using MRI-based methods with respect to CT-based approach for all 10 subjects analyzed. Solid curve represents mean across 5 subjects for each method. Voxelwise relative differences are below 10% in at least 90% of voxels included in brain masks for all subjects when using Siemens skull model-based and GE ZTE-based approaches.
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