MR Imaging of Prostate Cancer: Diffusion Weighted Imaging and (3D) Hydrogen 1 (1H) MR Spectroscopy in Comparison with Histology. (27th June 2010)

• Record Type: Journal Article
• Authors: Yamamura, J.; Salomon, G.; Buchert, R.; Hohenstein, A.; Graessner, J.; Huland, H.; Graefen, M.; Adam, G.; Wedegaetner, U.
• Other Names: Maintz David Academic Editor.
• Is Part Of: Radiology research and practice. Volume 2011(2011)
• Publication Date: 2010-06-27
• Subjects: Radiography -- Periodicals; Radiology -- Periodicals; Medical radiology -- Periodicals; Radiology; Radiography; Radiology; Medical radiology; Electronic journals; Periodicals; Periodicals; Fulltext; Internet Resources; Periodicals; 616.0757
• DOI: 10.1155/2011/616852
• Languages: English
• ISSNs: 2090-1941

Abstract

Abstract : Purpose. To evaluate retrospectively the impact of diffusion weighted imaging (DWI) and (3D) hydrogen 1 ( 1 H) MR-spectroscopy (MRS) on the detection of prostatic cancer in comparison to histological examinations. Materials and Methods: 50 patients with suspicion of prostate cancer underwent a MRI examination at a 1.5T scanner. The prostate was divided into sextants. Regions of interest were placed in each sextant to evaluate the apparent diffusion coefficient (ADC)-values. The results of the DWI as well as MRS were compared retrospectively with the findings of the histological examination. Sensitivity and specificity of ADC and metabolic ratio (MET)—both separately and in combination—for identification of tumor tissue was computed for variable discrimination thresholds to evaluate its receiver operator characteristic (ROC). An association between ADC, MET and Gleason score was tested by the non-parametric Spearmanρ -test. Results. The average ADC-value was1.65 ± 0.32 mm 2 /s× 10 -3 in normal tissue and 0.96±0.24 mm 2 /s× 10 -3 in tumor tissue (mean± 1 SD). MET was0.418 ± 0.431 in normal tissue and2.010 ± 1.649 in tumor tissue. The area under the ROC curve was 0.966 (95%-confidence interval 0.941–0.991) and 0.943 (0.918–0.968) for DWI and MRS, respectively. There was a highly significant negative correlation between ADC-value and the Gleason score in the tumor-positive tissue probes (n = 62, ρ = - 0.405, P = . 001 ). MRS did not show a significant correlation with the Gleason score (ρ = 0.117, P = . 366 ). By using both the DWI and MRS, the regression model provided sensitivity and specificity for detection of tumor of 91.9% and 98.3%, respectively. Conclusion. The results of our study showed that both DWI and MRS should be considered as an additional and complementary tool to the T2-weighted MRI for detecting prostate cancer.