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A volunteer subject with no known significant health problems who participates in research to test a new drug, device or intervention. These volunteers are recruited to serve as controls for patient groups. Healthy volunteers receive the same test, procedure, or drug the patient group receives.

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During the early phases (phases 1 and 2), researchers assess safety, side effects, optimal dosages and risks/benefits. In the later phase (phase 3), researchers study whether the treatment works better than the current standard therapy. They also compare the safety of the new treatment with that of current treatments. Phase 3 trials include large numbers of people to make sure that the result is valid. There are also less common very early (phase 0) and later (phase 4) phases. Phase 0 trials are small trials that help researchers decide if a new agent should be tested in a phase 1 trial. Phase 4 trials look at long-term safety and effectiveness, after a new treatment has been approved and is on the market.

Search Results 1-10 of 37 for Ultrasound

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  • Study status: Open/Status Unknown
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  1. A Study of the Mayo Clinic College of Medicine Ultrasound System

    Rochester, MN

  2. Ultrasound Imaging of Hepatic Masse Vasculature for Treatment Evaluation

    Rochester, MN

  3. Training of Physicians in Critical Care Ultrasonography (CCUS)

    Rochester, MN

  4. New Technologies to Determine Carotid Plaque Vulnerability in Patients With Significant Carotid Plaques

    Rochester, MN

  5. Study to Compare Contrast-Enhanced Ultrasound, Contrast-Enhanced Dual Energy Mammography, and Contrast-Enhanced Breast MR for Early Breast Cancer Detection

    Rochester, MN

  6. A Study to Evaluate a Novel Technique to Diagnose Carotid Artery Stenosis

    Rochester, MN

  7. A Study of the Use of Shear Wave Elastography with an Ultrasound Scanner to Measure Myofascial Trigger Points

    Rochester, MN

  8. Ultrasound Evaluation of Synovitis

    Rochester, MN

  9. Ultrasound-based Technology (similar to standard clinical echocardiography) for Measuring the Stiffness of Heart Muscle and Peripheral Arteries

    Rochester, MN

  10. A Study of Evaluating the Use of Ultrasound Shear Wave Imaging in Patients with Liver Fibrosis

    Rochester, MN

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