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Erschienen in: European Radiology 4/2015

01.04.2015 | Oncology

The Histogram Analysis of Diffusion-Weighted Intravoxel Incoherent Motion (IVIM) Imaging for Differentiating the Gleason grade of Prostate Cancer

verfasst von: Yu-Dong Zhang, Qing Wang, Chen-Jiang Wu, Xiao-Ning Wang, Jing Zhang, Hui Liu, Xi-Sheng Liu, Hai-Bin Shi

Erschienen in: European Radiology | Ausgabe 4/2015

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Abstract

Objective

To evaluate histogram analysis of intravoxel incoherent motion (IVIM) for discriminating the Gleason grade of prostate cancer (PCa).

Methods

A total of 48 patients pathologically confirmed as having clinically significant PCa (size > 0.5 cm) underwent preoperative DW-MRI (b of 0–900 s/mm2). Data was post-processed by monoexponential and IVIM model for quantitation of apparent diffusion coefficients (ADCs), perfusion fraction f, diffusivity D and pseudo-diffusivity D*. Histogram analysis was performed by outlining entire-tumour regions of interest (ROIs) from histological–radiological correlation. The ability of imaging indices to differentiate low-grade (LG, Gleason score (GS) ≤6) from intermediate/high-grade (HG, GS > 6) PCa was analysed by ROC regression.

Results

Eleven patients had LG tumours (18 foci) and 37 patients had HG tumours (42 foci) on pathology examination. HG tumours had significantly lower ADCs and D in terms of mean, median, 10th and 75th percentiles, combined with higher histogram kurtosis and skewness for ADCs, D and f, than LG PCa (p < 0.05). Histogram D showed relatively higher correlations (ñ = 0.641–0.668 vs. ADCs: 0.544–0.574) with ordinal GS of PCa; and its mean, median and 10th percentile performed better than ADCs did in distinguishing LG from HG PCa.

Conclusion

It is feasible to stratify the pathological grade of PCa by IVIM with histogram metrics. D performed better in distinguishing LG from HG tumour than conventional ADCs.

Key Points

GS had relatively higher correlation with tumour D than ADCs.
Difference of histogram D among two-grade tumours was statistically significant.
D yielded better individual features in demonstrating tumour grade than ADC.
D* and f failed to determine tumour grade of PCa.
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Metadaten
Titel
The Histogram Analysis of Diffusion-Weighted Intravoxel Incoherent Motion (IVIM) Imaging for Differentiating the Gleason grade of Prostate Cancer
verfasst von
Yu-Dong Zhang
Qing Wang
Chen-Jiang Wu
Xiao-Ning Wang
Jing Zhang
Hui Liu
Xi-Sheng Liu
Hai-Bin Shi
Publikationsdatum
01.04.2015
Verlag
Springer Berlin Heidelberg
Erschienen in
European Radiology / Ausgabe 4/2015
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-014-3511-4

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