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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 Meeting March 21, 2005. Site Differences in Sensitivity. Site Differences in Smoothness. Smoothness Predicts Sensitivity.

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Site differences in kspace filtering and how they explain site differences in image smoothness

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 Meeting

March 21, 2005





Site differences in kspace filtering and how they explain site differences in image smoothness

http://www.revisemri.com/tutorials/intro_kspace1.htm

Dave Higgins

Google: kspace mri tutorial


The voxel point spread function

Broader PSF

More Smooth Image

Less Noisy Image

More Sensitive to BOLD

Narrow PSF

Less Smooth Image

More Noisy Image

Less Sensitive to BOLD

The Voxel Point Spread Function



Site differences in kspace filtering and how they explain site differences in image smoothness

IOWA GE 1.5T

STAN 3T, DUKE 1.5T, DUKE 4.0T all GE

IRVINE PICKER 1.5T

ALL SIEMENS, BRIGHAM GE 3T


Site differences in kspace filtering and how they explain site differences in image smoothness

SPIRAL

EPI


Site differences in kspace filtering and how they explain site differences in image smoothness

STAN 3T, DUKE 1.5T, DUKE 4.0T

IOWA GE 1.5T

IRVINE PICKER 1.5T


Recommendations for multi center studies
Recommendations for Multi-Center Studies

All sites use same kspace filtering regimes

Easy to implement

Higher Spatial Resolution

Less Smooth

More Noisy

Less Sensitive

Ugly Voxel PSF

No Kspace Filters

gary

Hard to implement

Lower Spatial Resolution

More Smooth

Less Noisy

More Sensitive

Pretty Voxel PSF

Rotationally Symmetric

Fermi Filter

Radius = 32

Width = 2.5