DOI: 10.1007/s00259-017-3854-6Pages: 1-8

Simultaneous whole-body 18F–PSMA-1007-PET/MRI with integrated high-resolution multiparametric imaging of the prostatic fossa for comprehensive oncological staging of patients with prostate cancer: a pilot study

1. German Cancer Research Center, Department of Radiology

2. University Hospital Heidelberg, Department of Urology

3. German Cancer Research Center, Division of Radiopharmaceutical Chemistry

4. University Hospital Heidelberg, Department of Nuclear Medicine

5. German Cancer Research Center, Medical Image Computing Group

6. Technical University Hospital Munich, Department of Nuclear Medicine

7. University Hospital Heidelberg, Institute of Pathology

8. German Cancer Research Center, Clinical Cooperation Unit Nuclear Medicine

Correspondence to:
Martin T. Freitag
Tel: 06221-422523
Email: m.freitag@dkfz.de

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Abstract

Introduction

The aim of the present study was to explore the clinical feasibility and reproducibility of a comprehensive whole-body 18F–PSMA-1007-PET/MRI protocol for imaging prostate cancer (PC) patients.

Methods

Eight patients with high-risk biopsy-proven PC underwent a whole-body PET/MRI (3 h p.i.) including a multi-parametric prostate MRI after 18F–PSMA-1007-PET/CT (1 h p.i.) which served as reference. Seven patients presented with non-treated PC, whereas one patient presented with biochemical recurrence. SUVmean-quantification was performed using a 3D–isocontour volume-of-interest. Imaging data was consulted for TNM-staging and compared with histopathology. PC was confirmed in 4/7 patients additionally by histopathology after surgery. PET-artifacts, co-registration of pelvic PET/MRI and MRI-data were assessed (PI-RADS 2.0).

Results

The examinations were well accepted by patients and comprised 1 h. SUVmean-values between PET/CT (1 h p.i.) and PET/MRI (3 h p.i.) were significantly correlated (p < 0.0001, respectively) and similar to literature of 18F–PSMA-1007-PET/CT 1 h vs 3 h p.i. The dominant intraprostatic lesion could be detected in all seven patients in both PET and MRI. T2c, T3a, T3b and T4 features were detected complimentarily by PET and MRI in five patients. PET/MRI demonstrated moderate photopenic PET-artifacts surrounding liver and kidneys representing high-contrast areas, no PET-artifacts were observed for PET/CT. Simultaneous PET-readout during prostate MRI achieved optimal co-registration results.

Conclusions

The presented 18F–PSMA-1007-PET/MRI protocol combines efficient whole-body assessment with high-resolution co-registered PET/MRI of the prostatic fossa for comprehensive oncological staging of patients with PC.

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  • Accepted: Oct 5, 2017
  • Online: Oct 16, 2017

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