Technical Development of Cardiovascular Magnetic Resonance Imaging (CMR) Using a Low Specific Absorption Rate (SAR) Scanner System
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- STATUS
- Recruiting
Summary
Background:
- Researchers are testing version of a system known as a magnetic resonance imagining (MRI) scanner that uses strong magnetic fields, radio waves and the like to create images of the organs in the body. It uses lower energy levels than other MRI scanners. This may help scan people with metal devices in their body, or in invasive heart procedures using metal tools.
Objective:
- To test a new MRI scanner and software changes to create better pictures.
Eligibility:
- People with disease and healthy volunteers, ages 18 and older.
Design:
- Participants will be screened with blood tests.
- Participants may have both the new MRI and a conventional MRI or only the new one. If 2 are done, they must be within 60 days.
- For both MRI versions, participants lie on a table that slides into a large tube. During scans, they will hold their breath for up to 20 seconds at a time. Heart activity will be measured by wires connected to pads on the skin. A flexible belt may be used to monitor their breathing. They will be in the scanner up to 2 hours.
- Participants can agree to have a dye called gadolinium injected into their arm during the scan. This brightens the pictures.
- Participants can agree to take a drug called a vasodilator. This helps detect areas of the heart with abnormal blood supply. Scans of the heart are taken before, during, and after they get the medicine. The drug may cause temporary chest pain or shortness of breath. They may get other drugs to relieve these symptoms.
- Sponsoring Institution: National Heart, Lung, and Blood Institute
Description
Magnetic resonance imaging (MRI) generates medical images of organs inside the body and can provide accurate and reproducible measures of cardiac chamber volumes, cardiac function, blood flow, myocardial scar, extracellular volume as a measure of collagen content, iron content, and others, all without exposure to ionizing radiation. The prevailing wisdom is that MRI using high specific absorption rate (SAR) scanning modes produces highest image quality. We propose a method of MRI that can be performed with low SAR but that nevertheless preserves image quality because of efficient use of MRI signal. MRI using low SAR is attractive because it may reduce heating of metallic structures. This may allow safe MRI in patients with metallic implants, and it may allow MRI catheterization using metallic guidewires and catheter devices.
The goal of this non-significant risk (NSR) medical device study is to test initial technical feasibility of low SAR MRI in healthy volunteers by technical optimization of scanner protocols, to test comparative accuracy of standard CMR measurements in healthy volunteers using low SAR MRI versus conventional MRI.
A secondary goal is to assess the potential of this new low-SAR MRI system to perform cardiovascular diagnostic imaging and non-cardiovascular radiological diagnostic imaging by testing comparative diagnostic accuracy of standard MR measurements in adult patients with known disease using the low SAR MRI system vs conventional MR exam.
Details
| Condition | Cardiovascular Disease, *Healthy Patient Studies, Cardiovascular Imaging |
|---|---|
| Clinical Study Identifier | TX218180 |
| Last Modified on | 9 April 2019 |
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