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Kidney size estimation in piglets using dimercaptosuccinic acid (DMSA) scintigraphy
1Department of Clinical Physiology, University Hospital of Lund, Sweden.
Clinical Physiology (Oxford, England)
|December 31, 1997
Summary
Dimercaptosuccinic acid (DMSA) scintigraphy reliably measures kidney length in pediatric patients. However, width and volume measurements, particularly for smaller kidneys, show less accuracy.
Area of Science:
- Nuclear Medicine
- Pediatric Nephrology
- Medical Imaging
Background:
- Accurate kidney size assessment is crucial in pediatric practice.
- Dimercaptosuccinic acid (DMSA) scintigraphy is a common imaging modality.
- Validation of DMSA measurements against anatomical references is needed.
Purpose of the Study:
- To validate kidney size measurements (length, width, volume) using DMSA scintigraphy.
- To assess accuracy in pediatric-relevant kidney sizes.
- To compare scintigraphic data with direct measurements and phantom studies.
Main Methods:
- DMSA scintigraphy performed on 10 piglets in vivo.
- Comparison with excised kidneys (calipers, planar scintigraphy, water submersion).
- Kidney phantom and torso phantom used for further validation of planar and tomographic scintigraphy.
Main Results:
- Scintigraphy overestimated renal length by <4% (excised) and <8% (in vivo).
- Width measurements showed higher overestimation: 7.0% (excised) and 7.8% (in vivo).
- Volume estimation by tomography overestimated by 23%; phantom studies showed overestimations of 5-11% for length, width, and volume.
Conclusions:
- DMSA scintigraphic renal length measurements are reliable for pediatric kidneys.
- Scintigraphic width measurements and volume estimations demonstrate lower reliability.
- Caution is advised when interpreting DMSA-derived width and volume, especially for small kidneys.