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Updated: Jun 4, 2026
Registered Bioimaging of Nanomaterials for Diagnostic and Therapeutic Monitoring
Published on: December 9, 2010
Comprehensive small animal imaging strategies on a clinical 3 T dedicated head MR-scanner; adapted methods and
Deepu R Pillai1, Robin M Heidemann, Praveen Kumar
1Department of Neurology, Regensburg University Medical Centre, Regensburg, Germany.
Background:
Small animal models of human diseases are an indispensable aspect of pre-clinical research. Being dynamic, most pathologies demand extensive longitudinal monitoring to understand disease mechanisms, drug efficacy and side effects. These considerations often demand the concomitant development of monitoring systems with sufficient temporal and spatial resolution.
Methodology And Results:
This study attempts to configure and optimize a clinical 3 Tesla magnetic resonance scanner to facilitate imaging of small animal central nervous system pathologies. The hardware of the scanner was complemented by a custom-built, 4-channel phased array coil system. Extensive modification of standard sequence protocols was carried out based on tissue relaxometric calculations. Proton density differences between the gray and white matter of the rodent spinal cord along with transverse relaxation due to magnetic susceptibility differences at the cortex and striatum of both rats and mice demonstrated statistically significant differences. The employed parallel imaging reconstruction algorithms had distinct properties dependent on the sequence type and in the presence of the contrast agent. The attempt to morphologically phenotype a normal healthy rat brain in multiple planes delineated a number of anatomical regions, and all the clinically relevant sequels following acute cerebral ischemia could be adequately characterized. Changes in blood-brain-barrier permeability following ischemia-reperfusion were also apparent at a later time. Typical characteristics of intra-cerebral haemorrhage at acute and chronic stages were also visualized up to one month. Two models of rodent spinal cord injury were adequately characterized and closely mimicked the results of histological studies. In the employed rodent animal handling system a mouse model of glioblastoma was also studied with unequivocal results.
Conclusions:
The implemented customizations including extensive sequence protocol modifications resulted in images of high diagnostic quality. These results prove that lack of dedicated animal scanners shouldn't discourage conventional small animal imaging studies.
Insights
This study optimized a clinical MRI scanner for small animal central nervous system imaging. Customized protocols enabled high-quality visualization of rodent brain and spinal cord pathologies, including tumors and injuries.
Area of Science:
- Biomedical Imaging
- Pre-clinical Research
- Neuroscience
Background:
- Small animal models are crucial for studying human diseases and require longitudinal monitoring.
- Dynamic pathologies necessitate advanced imaging systems with high temporal and spatial resolution.
- Developing such monitoring systems is essential for understanding disease progression and treatment efficacy.
Purpose of the Study:
- To configure and optimize a clinical 3 Tesla magnetic resonance scanner for small animal central nervous system (CNS) imaging.
- To develop and validate advanced imaging protocols for preclinical research.
- To demonstrate the utility of a modified clinical scanner for characterizing various rodent CNS pathologies.
Main Methods:
- Utilized a clinical 3 Tesla MRI scanner equipped with a custom 4-channel phased array coil.
- Performed extensive modifications to standard MRI sequence protocols based on tissue relaxometric calculations.
- Employed parallel imaging reconstruction algorithms and contrast agents for enhanced image acquisition.
- Validated imaging protocols by phenotyping healthy rodent brains and characterizing induced pathologies.
Main Results:
- Achieved statistically significant differentiation of gray and white matter in rodent spinal cords.
- Successfully characterized acute cerebral ischemia, including blood-brain-barrier changes and intra-cerebral hemorrhage.
- Adequately visualized two models of rodent spinal cord injury, correlating with histological findings.
- Demonstrated unequivocal results in a mouse model of glioblastoma, showcasing the system's versatility.
Conclusions:
- Implemented hardware and software customizations yield high-diagnostic-quality images in small animals.
- A modified clinical MRI scanner can effectively support advanced small animal imaging studies.
- Dedicated animal scanners are not strictly necessary for high-quality preclinical CNS research.
