Possibilities and limitations for high resolution small animal MRI on a clinical whole-body 3T scanner

• Published in: Magma (New York, N.Y.) Vol. 25; no. 3; pp. 233 - 244
• Main Authors: Herrmann, Karl-Heinz, Schmidt, Silvio, Kretz, Alexandra, Haenold, Ronny, Krumbein, Ines, Metzler, Martin, Gaser, Christian, Witte, Otto W., Reichenbach, Jürgen R.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.06.2012
• Subjects: Animals; Biomedical Engineering and Bioengineering; Brain - pathology; Computer Appl. in Life Sciences; Equipment Design; Equipment Failure Analysis; Feasibility Studies; Health Informatics; Image Enhancement - instrumentation; Imaging; Magnetic Resonance Imaging - instrumentation; Magnetic Resonance Imaging - veterinary; Medicine; Medicine & Public Health; Mice; Radiology; Rats; Reproducibility of Results; Research Article; Sensitivity and Specificity; Solid State Physics; Whole Body Imaging - instrumentation; Whole Body Imaging - veterinary; MEMRI; High spatial resolution; MRI; Rodents; 3 T; Morphometry; Clinical scanner
• ISSN: 0968-5243; 1352-8661
• DOI: 10.1007/s10334-011-0284-5

Object To investigate the potential of a clinical 3 T scanner to perform MRI of small rodents. Materials and methods Different dedicated small animal coils and several imaging sequences were evaluated to optimize image quality with respect to SNR, contrast and spatial resolution. As an application, optimal grey-white-matter contrast and resolution were investigated for rats. Furthermore, manganese-enhanced MRI was applied in mice with unilateral crush injury of the optic nerve to investigate coil performance on topographic mapping of the visual projection. Results Differences in SNR and CNR up to factor 3 and more were observed between the investigated coils. The best grey-white matter contrast was achieved with a high resolution 3D T 2 -weighted TSE (SPACE) sequence. Delineation of the retino-tectal projection and detection of defined visual pathway damage on the level of the optic nerve could be achieved by using a T 1 -weighted, 3D gradient echo sequence with isotropic resolution of (0.2 mm) 3 . Conclusions Experimental studies in small rodents requiring high spatial resolution can be performed by using a clinical 3 T scanner with appropriate dedicated coils.