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Three-dimensional canine renovascular structure and circulation visualized in situ with the dynamic spatial
M D Bentley1, E A Hoffman, M J Fiksen-Olsen
1Department of Physiology and Biophysics, Mayo Medical School, Rochester, Minnesota 55905.
The American Journal of Anatomy
|January 1, 1988
Summary
The dynamic spatial reconstructor visualizes canine renal circulation and anatomy. This X-ray computed tomographic system reveals blood flow dynamics up to arcuate arteries, offering insights into kidney capillary circulation.
Area of Science:
- Medical Imaging
- Renal Physiology
- Veterinary Anatomy
Background:
- Assessing canine renal vasculature and circulation in situ is crucial for understanding kidney function.
- Existing imaging techniques may have limitations in visualizing fine vascular structures and dynamic blood flow.
Purpose of the Study:
- To evaluate the utility of a dynamic spatial reconstructor (DSR) for imaging canine renovascular anatomy and renal circulation.
- To compare DSR imaging with vascular casts for detailed anatomical and functional assessment.
Main Methods:
- Utilized a high-speed, volume-scanning X-ray computed tomographic system (DSR) on four canine kidneys.
- Performed scans during bolus injections of angiographic contrast material and a contrast-enhanced casting compound.
- Created vascular casts by digesting kidney parenchyma in potassium hydroxide for comparison.
Main Results:
- The DSR system clearly detected interlobar and arcuate arteries.
- While vessels <1 mm were not resolved, dynamic density changes visualized capillary bed flow.
- Maximal cortical density was observed in the outer-middle zone throughout scans.
- Renal artery-to-vein transit time was as short as 3 seconds.
Conclusions:
- The DSR system effectively visualizes canine renal circulation up to the arcuate artery level.
- Capillary flow through the renal cortex can be followed, indicating both rapid and slow peritubular circulation components.