Cerebral Microbleeds on MR Imaging: Comparison between 1.5 and 7T

• Published in: American journal of neuroradiology : AJNR Vol. 32; no. 6; pp. 1043 - 1049
• Main Authors: CONIJN, M. M. A, GEERLINGS, M. I, BIESSELS, G.-J, TAKAHARA, T, WITKAMP, T. D, ZWANENBURG, J. J. M, LUIJTEN, P. R, HENDRIKSE, J
• Format: Journal Article
• Language: English
• Published: Oak Brook, IL American Society of Neuroradiology 01.06.2011
• Subjects: Adult and adolescent clinical studies; Alzheimer Disease - complications; Alzheimer Disease - diagnosis; Biological and medical sciences; Brain; Cerebral Hemorrhage - diagnosis; Cerebral Hemorrhage - etiology; Female; Humans; Investigative techniques, diagnostic techniques (general aspects); Magnetic Resonance Angiography - methods; Male; Medical sciences; Middle Aged; Miscellaneous; Mood disorders; Nervous system; Observer Variation; Psychology. Psychoanalysis. Psychiatry; Psychopathology. Psychiatry; Radiodiagnosis. Nmr imagery. Nmr spectrometry; Reproducibility of Results; Sensitivity and Specificity; Nervous system diseases; Radiodiagnosis; Nuclear magnetic resonance imaging; Comparative study; Central nervous system; Encephalon
• ISSN: 0195-6108; 1936-959X
• DOI: 10.3174/ajnr.A2450

The detection of microbleeds differs strongly between studies, due to differences in scan protocol. This study aims to compare the visualization of microbleeds with 3D T2*-weighted imaging at 1.5T with 3D dual-echo T2*-weighted imaging at 7T. Thirty-four patients (29 male; mean age, 58 ± 12 years) with atherosclerotic disease from the Second Manifestations of ARTerial Disease study were included. 3D T2*-weighted imaging at 1.5T and dual-echo T2*-weighted imaging at 7T were done in all patients. The presence and number of definite microbleeds were recorded on minimal intensity projections. Inter- and intraobserver reliability was assessed with Cohen κ test and the ICC. The difference in presence and number of microbleeds was tested with the McNemar test and Wilcoxon signed rank test. The interobserver ICC at 7T was 0.61 and the intraobserver ICC was 0.94, whereas at 1.5T the interobserver ICC was 0.50 and the intraobserver ICC was 0.59. Microbleeds were detected in significantly more patients on 7T (50%) than on 1.5T scans (21%) (P = .001). The number of microbleeds was also higher at 7T (median, 0.5; range, 0-5) than on 1.5T (median, 0.0; range, 0-6) (P = .002). 3D dual-echo T2*-weighted imaging at 7T results in better and more reliable detection of microbleeds compared with 3D T2*-weighted imaging at 1.5T.