The primary objective of the study is the matching of sensitivity, specificity, the negative predicate value and the positive predictive value of Contrast-Enhanced Ultrasound (CEUS), Shear Wave Elastography (SWE) and the combination to detect clinically significant prostate carcinoma foki. Conventional ultrasound is insufficient to safely display prostate carcinoma. Therefore, other imaging agents are recently added to improve the detection of tumor foci. These include innovative imaging ultrasound methods and multiparametric MRI.
All patients scheduled for radical prostatectomy in the Martini-Klinik are admitted the day prior to the surgery. In case a patient gives his informed consent mpUS (multiparametric Ultrasound) scanning is performed on the day prior to surgery, the day of admittance. The patient will be prepared with an intravenous access to administer the contrast agent. Ultrasound Scanning will be performed in the left-lateral decubitus position and start with regular B-mode scanning and volumetry. A base to apex sweeps and left to right sweep will be acquired to allow building a 3D reconstruction of the prostate. The imaging protocol will then start with SWE. Stiffness of the tissue is measured in Shear modulus (kPa) and visualized in a color scale. SWE results will be recorded for later interpretation and analysis. Then 2 minute recordings of CEUS imaging will be made following the administration of a 2.4ml bolus of the contrast agent SonoVue® (Bracco, Geneva) through the intravenous canula. A maximum of four recordings will be made. For every recording a new bolus of contrast agent will be administered. In this way, for planes the contrast inflow can be recorded. Data will be stored and transported to an image processing system for dispersion analysis. On this system a dispersion (CUDI) parametric map will be constructed from each acquired CEUS recording. At the time of interpretation imaging results will be scored separately for the standard prostate sextants, base left, base right, mid left, mid right, apex left and apex right. The radical prostatectomy will be performed as in accordance to institution standards. This procedure will not be altered because of the trial. In many cases this means frozen sections are taken intraoperatively from the lateral sides of the prostate. These frozen sections are processed separately from the resection specimen in the pathology lab. Following the radical prostatectomy the resection specimen is fixated according to institution standards. This means that the specimen is photographed and the location and orientation of all coupes is recorded. This will enable allocating pathology findings to the standard prostate sextants described earlier.
Study Type
OBSERVATIONAL
Enrollment
50
compare the mpUS to other methods
Martini-Klinik am UKE GmbH
Hamburg, Germany
Diagnostic accuracy in terms of sensitivity and specificity of CEUS, SWE and their combination using radical prostatectomy specimens as the gold-standard.
The data gathered will be structured so that for each prostate sextant B-mode TRUS results, SWE results, CEUS results including CUDI maps and Pathology results are available for correlation. For the imaging modalities quantifiable data and visual interpretation using a 1 to 5 Likert-type scale for suspicion will be stored for each sextant. Pathology data will be gathered in the form of tumor size and grade. The data will be used to calculate sensitivity, specificity, negative predictive value and positive predictive value for each of the imaging modalities separately. Furthermore the data will be used to calculate an optimal algorithm for combining the imaging modalities. The maximum attainable sensitivity, specificity, NPV and PPV for tumor detection using this optimized algorithm will be calculated.
Time frame: 14 days
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