Volume 74, Issue 4 pp. 1077-1085
Note

Comparison of fitting methods and b-value sampling strategies for intravoxel incoherent motion in breast cancer

Gene Young Cho

Corresponding Author

Gene Young Cho

Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, New York, USA

Sackler Institute of Graduate Biomedical Sciences, New York University School of Medicine, New York, New York, USA

Correspondence to: Gene Young Cho, M.S., 660 First Avenue, 4th Floor, Room 420, New York, NY 10016. E-mail: [email protected]Search for more papers by this author
Linda Moy

Linda Moy

Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, New York, USA

New York University Langone Medical Center - Cancer Institute, New York, New York, USA

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Jeff L. Zhang

Jeff L. Zhang

Department of Radiology, University of Utah, Salt Lake City, Utah, USA

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Steven Baete

Steven Baete

Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, New York, USA

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Riccardo Lattanzi

Riccardo Lattanzi

Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, New York, USA

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Melanie Moccaldi

Melanie Moccaldi

New York University Langone Medical Center - Cancer Institute, New York, New York, USA

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James S. Babb

James S. Babb

Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, New York, USA

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Sungheon Kim

Sungheon Kim

Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, New York, USA

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Daniel K. Sodickson

Daniel K. Sodickson

Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, New York, USA

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Eric E. Sigmund

Eric E. Sigmund

Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, New York, USA

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First published: 09 October 2014
Citations: 98

Abstract

Purpose

To compare fitting methods and sampling strategies, including the implementation of an optimized b-value selection for improved estimation of intravoxel incoherent motion (IVIM) parameters in breast cancer.

Methods

Fourteen patients (age, 48.4 ± 14.27 years) with cancerous lesions underwent 3 Tesla breast MRI examination for a HIPAA-compliant, institutional review board approved diffusion MR study. IVIM biomarkers were calculated using “free” versus “segmented” fitting for conventional or optimized (repetitions of key b-values) b-value selection. Monte Carlo simulations were performed over a range of IVIM parameters to evaluate methods of analysis. Relative bias values, relative error, and coefficients of variation (CV) were obtained for assessment of methods. Statistical paired t-tests were used for comparison of experimental mean values and errors from each fitting and sampling method.

Results

Comparison of the different analysis/sampling methods in simulations and experiments showed that the “segmented” analysis and the optimized method have higher precision and accuracy, in general, compared with “free” fitting of conventional sampling when considering all parameters. Regarding relative bias, IVIM parameters fp and Dt differed significantly between “segmented” and “free” fitting methods.

Conclusion

IVIM analysis may improve using optimized selection and “segmented” analysis, potentially enabling better differentiation of breast cancer subtypes and monitoring of treatment. Magn Reson Med 74:1077–1085, 2015. © 2014 Wiley Periodicals, Inc.

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