Volume 29, Issue 1 pp. 183-188
Technical Note

Cerebral blood flow estimation in vivo using local tissue reference functions

Jayme Cameron Kosior BSc

Jayme Cameron Kosior BSc

Department of Electrical and Computer Engineering, University of Calgary, Calgary, Alberta, Canada

Seaman Family MR Research Centre, Foothills Medical Centre, Calgary Health Region, Calgary, Alberta, Canada

Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada

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Michael R. Smith PhD

Michael R. Smith PhD

Department of Electrical and Computer Engineering, University of Calgary, Calgary, Alberta, Canada

Department of Radiology, University of Calgary, Calgary, Alberta, Canada

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Robert Karl Kosior BSc

Robert Karl Kosior BSc

Department of Electrical and Computer Engineering, University of Calgary, Calgary, Alberta, Canada

Seaman Family MR Research Centre, Foothills Medical Centre, Calgary Health Region, Calgary, Alberta, Canada

Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada

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Richard Frayne PhD

Corresponding Author

Richard Frayne PhD

Department of Electrical and Computer Engineering, University of Calgary, Calgary, Alberta, Canada

Seaman Family MR Research Centre, Foothills Medical Centre, Calgary Health Region, Calgary, Alberta, Canada

Department of Radiology, University of Calgary, Calgary, Alberta, Canada

Department of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada

Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada

Department of Radiology, Seaman Family MR Research Centre, Foothills Medical Centre/University of Calgary, 1403, 29th Street, NW, Calgary, AB, Canada T2N 2T9Search for more papers by this author
First published: 18 December 2008
Citations: 5

Presented in part at the 15th Annual Meeting of ISMRM, Berlin, Germany, 2007.

Abstract

Purpose

To evaluate the use of bolus signals obtained from tissue as reference functions (or local reference functions [LRFs]) rather than arterial input functions (AIFs) when deriving cross-calibrated cerebral blood flow (CBFCC) estimates via deconvolution.

Materials and Methods

AIF and white matter (WM) LRF CBFCC maps (cross-calibrated so that normal WM was 23.7 mL/minute/100 g) derived using singular value decomposition (SVD) were examined in 28 ischemic stroke patients. Median CBFCC estimates from normal gray matter (GM) and ischemic tissue were obtained.

Results

AIF and LRF median CBFCC estimates resembled one another for all 28 patients (average paired CBFCC difference 0.4 ± 1.7 mL/minute/100 g and –0.4 ± 1.4 mL/minute/100 g in GM and ischemic tissue, respectively). Wilcoxon signed-rank comparisons of patient median CBFCC measurements revealed no statistically significant differences between using AIFs and LRFs (P > 0.05).

Conclusion

If CBF is quantified using a patient-specific cross-calibration factor, then LRF CBF estimates are at least as accurate as those from AIFs. Therefore, until AIF quantification is achievable in vivo, perfusion protocols tailored for LRFs would simplify the methodology and provide more reliable perfusion information. J. Magn. Reson. Imaging 2009;29:183–188. © 2008 Wiley-Liss, Inc.

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