High-Resolution Mechanical Imaging of Glioblastoma by Multifrequency Magnetic Resonance Elastography

• Published in: PloS one Vol. 9; no. 10; p. e110588
• Main Authors: Streitberger, Kaspar-Josche, Reiss-Zimmermann, Martin, Freimann, Florian Baptist, Bayerl, Simon, Guo, Jing, Arlt, Felix, Wuerfel, Jens, Braun, Jürgen, Hoffmann, Karl-Titus, Sack, Ingolf
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 22.10.2014; Public Library of Science (PLoS)
• Subjects: Adolescent; Adult; Aged; Biology and Life Sciences; Biomechanics; Biopsy; Brain; Brain - pathology; Brain cancer; Brain mapping; Brain Mapping - instrumentation; Brain Mapping - methods; Brain Neoplasms - diagnosis; Brain Neoplasms - pathology; Diagnostic imaging; Edema; Elasticity; Elasticity Imaging Techniques; Female; Glioblastoma; Glioblastoma - diagnosis; Glioblastoma - pathology; Glioblastomas; Heterogeneity; High resolution; Humans; Image Interpretation, Computer-Assisted; Image resolution; Imaging, Three-Dimensional; Magnetic resonance; Magnetic Resonance Imaging; Male; Mechanical properties; Medical prognosis; Medicine and Health Sciences; Middle Aged; Neuroimaging; Neurosurgery; NMR; Nuclear magnetic resonance; Parameter estimation; Parenchyma; Patients; Preoperative Period; Resonance; Scanners; Shear modulus; Stiffness; Tumors; Viscoelasticity; Germany
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0110588

To generate high-resolution maps of the viscoelastic properties of human brain parenchyma for presurgical quantitative assessment in glioblastoma (GB). Twenty-two GB patients underwent routine presurgical work-up supplemented by additional multifrequency magnetic resonance elastography. Two three-dimensional viscoelastic parameter maps, magnitude |G*|, and phase angle φ of the complex shear modulus were reconstructed by inversion of full wave field data in 2-mm isotropic resolution at seven harmonic drive frequencies ranging from 30 to 60 Hz. Mechanical brain maps confirmed that GB are composed of stiff and soft compartments, resulting in high intratumor heterogeneity. GB could be easily differentiated from healthy reference tissue by their reduced viscous behavior quantified by φ (0.37±0.08 vs. 0.58±0.07). |G*|, which in solids more relates to the material's stiffness, was significantly reduced in GB with a mean value of 1.32±0.26 kPa compared to 1.54±0.27 kPa in healthy tissue (P = 0.001). However, some GB (5 of 22) showed increased stiffness. GB are generally less viscous and softer than healthy brain parenchyma. Unrelated to the morphology-based contrast of standard magnetic resonance imaging, elastography provides an entirely new neuroradiological marker and contrast related to the biomechanical properties of tumors.