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Implanted coil MR microscopy of renal pathology
T H Farmer1, G A Johnson, G P Cofer
1Duke University Medical Center, Durham, North Carolina 27710.
Magnetic Resonance in Medicine
|June 1, 1989
Summary
Implanted radiofrequency (RF) coils enhance MRI signal for rodent kidney imaging. This study used RF coils to track kidney injury and recovery in rats, reducing animal numbers needed for research.
Area of Science:
- Medical Imaging
- Nephrology
- Biomedical Engineering
Background:
- Implanted radiofrequency (RF) coils significantly improve signal-to-noise ratio in small animal MRI.
- Previous studies focused on general small animal imaging, not specific organ pathology.
Purpose of the Study:
- To adapt implanted RF coil technology for imaging rodent renal pathology.
- To investigate the utility of MR microscopy in monitoring acute tubular necrosis (ATN) and its resolution in rats.
Main Methods:
- Resonant RF coils were implanted around the left kidney in four rats.
- In vivo MRI was performed at 2 Tesla using a T1-weighted spin-echo sequence.
- Mercuric chloride was used to induce nephrotoxic ATN, with serial imaging and histological analysis.
Main Results:
- Baseline MR microscopy revealed detailed kidney structures (cortex, medulla, vasculature).
- Nephrotoxic ATN diminished cortico-medullary contrast within 24 hours, correlating with inner cortex pathology.
- Kidney MR appearance returned to baseline by 360 hours, confirmed by histology.
Conclusions:
- Implanted RF coils enable in vivo demonstration and serial monitoring of renal pathology, specifically nephrotoxic ATN.
- This technique allows for tracking the resolution of kidney damage in individual animals.
- The approach minimizes the number of animals required for biostatistical analysis in preclinical renal studies.