Volume 36, Issue 5 pp. 1113-1123
Original Research

Quantitative mapping of total choline in healthy human breast using proton echo planar spectroscopic imaging (PEPSI) at 3 Tesla

Chenguang Zhao PhD

Corresponding Author

Chenguang Zhao PhD

Department of Neurology and UNM Cancer Center, University of New Mexico School of Medicine, Albuquerque, New Mexico, USA

Department of Neurology, The University of New Mexico School of Medicine, 1 University of New Mexico, MSC 105620, Albuquerque, NM, 87131Search for more papers by this author
Patrick J. Bolan PhD

Patrick J. Bolan PhD

Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA

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Melanie Royce MD, PhD

Melanie Royce MD, PhD

Department of Internal Medicine and UNM Cancer Center, Division of Hematology/Oncology, University of New Mexico School of Medicine, Albuquerque, New Mexico, USA

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Navneeth Lakkadi MS

Navneeth Lakkadi MS

Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota, USA

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Steven Eberhardt MD

Steven Eberhardt MD

Department of Radiology and UNM Cancer Center, University of New Mexico School of Medicine, Albuquerque, New Mexico, USA

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Laurel Sillerud PhD

Laurel Sillerud PhD

Department of Biochemistry and Molecular Biology and UNM Cancer Center, University of New Mexico School of Medicine, Albuquerque, New Mexico, USA

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Sang-Joon Lee PhD

Sang-Joon Lee PhD

Department of Internal Medicine and UNM Cancer Center, Division of Epidemiology and Biostatistics, University of New Mexico School of Medicine, Albuquerque, New Mexico, USA

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Stefan Posse PhD

Stefan Posse PhD

Department of Neurology and UNM Cancer Center, University of New Mexico School of Medicine, Albuquerque, New Mexico, USA

Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, New Mexico, USA

Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico, USA

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First published: 10 July 2012
Citations: 12

Abstract

Purpose:

To quantitatively measure tCho levels in healthy breasts using Proton-Echo-Planar-Spectroscopic-Imaging (PEPSI).

Materials and Methods:

The two-dimensional mapping of tCho at 3 Tesla across an entire breast slice using PEPSI and a hybrid spectral quantification method based on LCModel fitting and integration of tCho using the fitted spectrum were developed. This method was validated in 19 healthy females and compared with single voxel spectroscopy (SVS) and with PRESS prelocalized conventional Magnetic Resonance Spectroscopic Imaging (MRSI) using identical voxel size (8 cc) and similar scan times (∼7 min).

Results:

A tCho peak with a signal to noise ratio larger than 2 was detected in 10 subjects using both PEPSI and SVS. The average tCho concentration in these subjects was 0.45 ± 0.2 mmol/kg using PEPSI and 0.48 ± 0.3 mmol/kg using SVS. Comparable results were obtained in two subjects using conventional MRSI. High lipid content in the spectra of nine tCho negative subjects was associated with spectral line broadening of more than 26 Hz, which made tCho detection impossible. Conventional MRSI with PRESS prelocalization in glandular tissue in two of these subjects yielded tCho concentrations comparable to PEPSI.

Conclusion:

The detection sensitivity of PEPSI is comparable to SVS and conventional PRESS-MRSI. PEPSI can be potentially used in the evaluation of tCho in breast cancer. A tCho threshold concentration value of ∼0.7 mmol/kg might be used to differentiate between cancerous and healthy (or benign) breast tissues based on this work and previous studies. J. Magn. Reson. Imaging 2012;36:1113–1123. © 2012 Wiley Periodicals, Inc.

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