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State-of-the-Art Technology
The Noninvasive Vascular Laboratory at USC University Hospital features the latest technology available in the field. This includes:
Direct Studies
Colorflow duplex ultrasonography is utilized to evaluate the arterial and venous systems. This technology combines three ultrasound modalities:
- Two-dimensional B-mode ultrasound imaging of tissue in gray scale provides anatomic information about the vessels of interest. The presence or absence of atherosclerotic plaque or thrombus is determined using this modality.
- Doppler ultrasound provides physiologic information about blood flow in the vessel. Using this modality, a Doppler velocity spectral analysis is obtained, which can determine whether plaque or thrombus is hemodynamically significant and compromising blood flow.
- Colorflow ultrasound provides the ability to quickly visualize blood flow and demonstrate the degree of vessel obstruction.
Indirect Studies
Indirect studies also play a key role in noninvasive vascular evaluations. These tests include digit plethysmographic analysis for evaluation of perfusion, spectral and/or analog waveform analysis for characterization of the Doppler velocity signals, segmental Doppler systolic pressures, partial transcutaneous oxygen pressure measurements, and air plethysmography (APG), which quantitatively evaluates venous outflow obstruction and valvular incompetence.
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