Volume 75, Issue 1 pp. 337-344
Full Paper

Rotating frame relaxation imaging of prostate cancer: Repeatability, cancer detection, and Gleason score prediction

Ivan Jambor

Corresponding Author

Ivan Jambor

Department of Diagnostic Radiology, University of Turku, Turku, Finland

Correspondence to: Ivan Jambor, M.D., Department of Diagnostic Radiology, University of Turku, Kiinamyllynkatu 4-8, P.O. Box 52, FI-20521 Turku, Finland. E-mail: [email protected]Search for more papers by this author
Marko Pesola

Marko Pesola

Department of Diagnostic Radiology, University of Turku, Turku, Finland

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Pekka Taimen

Pekka Taimen

Department of Pathology, University of Turku and Turku University Hospital, Turku, Finland

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Harri Merisaari

Harri Merisaari

Department of Information Technology, University of Turku, Turku, Finland

Turku PET Centre, University of Turku, Turku, Finland

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Peter J. Boström

Peter J. Boström

Department of Surgery, Division of Urology, Turku University Hospital, Turku, Finland

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Heikki Minn

Heikki Minn

Department of Oncology and Radiotherapy, Turku University Hospital, Turku, Finland

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Timo Liimatainen

Timo Liimatainen

Department of Biotechnology and Molecular Medicine, A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland

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Hannu J. Aronen

Hannu J. Aronen

Department of Diagnostic Radiology, University of Turku, Turku, Finland

Medical Imaging Centre of Southwest Finland, Turku University Hospital, Turku, Finland

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First published: 02 March 2015
Citations: 16

Abstract

Purpose

To investigate relaxation along a fictitious field (RAFF) and continuous wave (cw) T imaging of prostate cancer (PCa) in the terms of repeatability, PCa detection, and characterization.

Methods

Thirty-six patients (PSA 11.6 ± 7.6 ng/mL, mean ± standard deviation) with histologically confirmed PCa underwent two repeated 3T MR examinations using surface array coils before prostatectomy. Relaxation along fictitious field, cw T, and T2 relaxation times (TRAFF, T1ρcw, T2) were measured and averaged over regions of interest placed in PCa, normal peripheral zone (PZ), and normal central gland (CG) positioned using whole-mount prostatectomy sections and anatomical T2-weighted images. Receiver operating characteristic curve analysis with area under the curve (AUC) was calculated to distinguish PCa from PZ/CG and PCa with Gleason score (GS) of 3+3 from GS of 3+4/≥3+4.

Results

TRAFF and T1ρcw relaxation times were repeatable with coefficients of repeatability as a percentage of median value in the range of 7.8–23.2%. AUC (mean, 95% confidence interval) in the differentiation of PCa with GS of 3+3 from PCa with CS of ≥3+4 were 0.88 (0.72–0.99), 0.69 (0.46–0.90), and 0.68 (0.45–0.88), for TRAFF, T1ρcw, and T2, respectively.

Conclusion

In quantitative region of interest based analysis, TRAFF outperformed T1ρcw and T2 in PCa detection and characterization. Magn Reson Med 75:337–344, 2016. © 2015 Wiley Periodicals, Inc.

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