Abstract
Purpose
This study evaluated the accuracy of MR sequences [T2-, diffusion-weighted, and dynamic contrast-enhanced (T2WI, DWI, and DCE) imaging] at 3T, based on the European Society of Urogenital Radiology (ESUR) scoring system [Prostate Imaging Reporting and Data System (PI-RADS)] using MR-guided in-bore prostate biopsies as reference standard.
Methods
In 235 consecutive patients [aged 65.7 ± 7.9 years; median prostate-specific antigen (PSA) 8 ng/ml] with multiparametric prostate MRI (mp-MRI), 566 lesions were scored according to PI-RADS. Histology of all lesions was obtained by targeted MR-guided in-bore biopsy.
Results
In 200 lesions, biopsy revealed prostate cancer (PCa). The area under the curve (AUC) for cancer detection was 0.70 (T2WI), 0.80 (DWI), and 0.74 (DCE). A combination of T2WI + DWI, T2WI + DCE, and DWI + DCE achieved an AUC of 0.81, 0.78, and 0.79. A summed PI-RADS score of T2WI + DWI + DCE achieved an AUC of 0.81. For higher grade PCa (primary Gleason pattern ≥ 4), the AUC was 0.85 for T2WI + DWI, 0.84 for T2WI + DCE, 0.86 for DWI + DCE, and 0.87 for T2WI + DWI + DCE. The AUC for T2WI + DWI + DCE for transitional-zone PCa was 0.73, and for the peripheral zone 0.88. Regarding higher-grade PCa, AUC for transitional-zone PCa was 0.88, and for peripheral zone 0.96.
Conclusion
The combination of T2WI + DWI + DCE achieved the highest test accuracy, especially in patients with higher-grade PCa. The use of ≤2 MR sequences led to lower AUC in higher-grade and peripheral-zone cancers.
Key Points
• T2WI + DWI + DCE achieved the highest accuracy in patients with higher grade PCa
• T2WI + DWI + DCE was more accurate for peripheral- than for transitional-zone PCa
• DCE increased PCa detection accuracy in the peripheral zone
• DWI was the leading sequence in the transitional zone
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Abbreviations
- ESUR:
-
European Society of Urogenital Radiology
- PI-RADS:
-
Prostate Imaging Reporting and Data System
- mp-MRI:
-
Multiparametric magnetic resonance imaging
- DCE:
-
Dynamic contrast-enhanced imaging
- MRSI:
-
Magnetic resonance spectroscopic imaging
- DWI:
-
Diffusion-weighted imaging
- ROC:
-
Receiver operating characteristic
- AUC:
-
Area under the curve
- PCa:
-
Prostate cancer
- PSA:
-
Prostate-specific antigen
- TRUS:
-
Transrectal ultrasound
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Acknowledgments
The scientific guarantor of this publication is Dirk Blondin. The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article. The authors state that this work has not received any funding. No complex statistical methods were necessary for this paper. Institutional Review Board approval was obtained. Written informed consent was obtained from all patients in this study. No study participants or cohorts have been previously reported. Methodology: retrospective, diagnostic or prognostic study, performed at one institution.
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Schimmöller, L., Quentin, M., Arsov, C. et al. MR-sequences for prostate cancer diagnostics: validation based on the PI-RADS scoring system and targeted MR-guided in-bore biopsy. Eur Radiol 24, 2582–2589 (2014). https://doi.org/10.1007/s00330-014-3276-9
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DOI: https://doi.org/10.1007/s00330-014-3276-9