Published in:
01-09-2013 | Original article
Does 11C-choline PET-CT contribute to multiparametric MRI for prostate cancer localisation?
Authors:
L. Van den Bergh, S. Isebaert, M. Koole, R. Oyen, S. Joniau, E. Lerut, C.M. Deroose, F. De Keyzer, H. Van Poppel, K. Haustermans
Published in:
Strahlentherapie und Onkologie
|
Issue 9/2013
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Abstract
Background and purpose
The aim of this work was to determine whether 11C-choline positron emission tomography (PET)–computed tomography (CT) makes a positive contribution to multiparametric magnetic resonance imaging (MRI) for localisation of intraprostatic tumour nodules.
Patients and methods
A total of 73 patients with biopsy-proven intermediate- and high-risk prostate cancer were enrolled in a prospective imaging study consisting of T2-weighted (T2w), dynamic contrast-enhanced (DCE) and diffusion-weighted (DW) MRI and 11C-choline PET-CT before radical prostatectomy. Cancerous regions were delineated on the whole-mount prostatectomy sections and on the different MRI modalities and analysed in 24 segments per patient (3 sections, 8 segments each). To analyse PET-CT images, standardized uptake values (SUV) were calculated per segment.
Results
In total, 1,752 segments were analyzed of which 708 (40.4 %) were found to be malignant. A high specificity (94.7, 93.6 and 92.2 %) but relatively low sensitivity (31.2, 24.9 and 44.1 %) for tumour localisation was obtained with T2w, DCE and DW MRI, respectively. Sensitivity values significantly increased when combining all MRI modalities (57.2 %). For PET-CT, mean SUVmax of malignant octants was significantly higher than mean SUVmax of benign octants (3.68 ± 1.30 vs. 3.12 ± 1.02, p < 0.0001). In terms of accuracy, the benefit of adding PET-CT to (multiparametric) MRI was less than 1 %.
Conclusion
The additional value of 11C-choline PET-CT to MRI in localising intraprostatic tumour nodules is limited, especially when multiparametric MRI is used.