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Ultrasound echogenicity in experimental venous thrombosis
J B Fowlkes1, R M Strieter, L J Downing
1Department of Radiology, University of Michigan Medical Center, Ann Arbor, USA.
Ultrasound in Medicine & Biology
|December 2, 1998
Summary
This study shows that duplex ultrasound can measure echogenicity of venous thrombosis in rats and primates. Echogenicity increases over time and correlates with fibrin content, aiding in thrombus age determination.
Area of Science:
- Vascular Ultrasound
- Thrombosis Research
- Medical Imaging
Background:
- Venous thrombosis diagnosis and monitoring rely on imaging techniques.
- Accurate characterization of thrombus properties is crucial for effective treatment.
- Echogenicity, a measure of ultrasound reflectivity, is a key imaging parameter.
Purpose of the Study:
- To characterize the echogenicity of experimentally induced venous thrombosis in animal models.
- To assess the correlation between thrombus echogenicity and fibrin content.
- To evaluate the potential of duplex ultrasound for noninvasive thrombus age determination and progression monitoring.
Main Methods:
- Experimental venous thrombosis was induced in rat and primate inferior vena cava (IVC) models.
- Duplex ultrasound imaging was used to capture B-mode images of the IVC.
- Gain-corrected echogenicity units were measured longitudinally and transversely.
- Fibrin monomer levels were determined in rat studies via chromogenic assay.
Main Results:
- Thrombus echogenicity generally increased over time in both rat and primate studies.
- Significant differences in echogenicity were observed between ligated and sham-treated rats at various time points.
- Echogenicity values in primates were significantly different from baseline at all measured time points.
- Fibrin monomer levels showed a significant correlation with echogenicity units (p < 0.05).
Conclusions:
- Duplex ultrasound can effectively quantitate thrombus echogenicity.
- Thrombus echogenicity correlates with its fibrin content.
- This quantitative measurement holds potential for improved noninvasive thrombus age determination and monitoring of progression or resolution.