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![Page 1: Site Differences in Kspace Filtering and How They Explain Site Differences in Image Smoothness Lee Friedman, Ph.D. The MIND Institute FIRST BIRN All Hands.](https://reader036.fdocuments.us/reader036/viewer/2022062304/56649f575503460f94c7ba9f/html5/thumbnails/1.jpg)
Site Differences inSite Differences in Kspace Filtering Kspace Filtering
and How They Explain and How They Explain Site Differences in Image Site Differences in Image
SmoothnessSmoothnessLee Friedman, Ph.D.Lee Friedman, Ph.D.The MIND InstituteThe MIND Institute
FIRST BIRN All Hands MeetingFIRST BIRN All Hands MeetingMarch 21, 2005March 21, 2005
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Site Differences in SensitivitySite Differences in Sensitivity
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Site Differences in SmoothnessSite Differences in Smoothness
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Smoothness Predicts SensitivitySmoothness Predicts Sensitivity
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http://www.revisemri.com/tutorials/intro_kspace1.htmDave Higgins
Google: kspace mri tutorial
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The Voxel Point Spread FunctionThe Voxel Point Spread Function
Narrow PSFLess Smooth ImageMore Noisy Image
Less Sensitive to BOLD
Broader PSFMore Smooth Image
Less Noisy ImageMore Sensitive to BOLD
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STAN 3T, DUKE 1.5T, DUKE 4.0T all GE IOWA GE 1.5T
IRVINE PICKER 1.5T ALL SIEMENS, BRIGHAM GE 3T
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EPI SPIRAL
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STAN 3T, DUKE 1.5T, DUKE 4.0TIOWA GE 1.5T IRVINE PICKER 1.5T
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Recommendations for Multi-Center Recommendations for Multi-Center StudiesStudies
No Kspace Filters
Easy to implementHigher Spatial ResolutionLess SmoothMore NoisyLess SensitiveUgly Voxel PSF
All sites use same kspace filtering regimes
Rotationally SymmetricFermi FilterRadius = 32Width = 2.5
Hard to implementLower Spatial ResolutionMore SmoothLess NoisyMore SensitivePretty Voxel PSF