Mar 172010

4D Heart Imaging

Heart disease is the number one killer in the U.S, and congenital heart disease is the most common birth defect around the world.

About five million people in the U.S. have heart failure, and it kills 300,000 people a year. Current lengthy MRI heart imaging technology has led to long waiting lists but remarkable new imaging technology can not only show the heart in 3D showing blood flow, direction, and velocity but can also show them relating to a fourth dimension – time. The procedure is fast, and requires no invasive procedures, no contrast agent or general anesthesia and could have significant consequences for patients at risk of cardiac problems.

Until now physicians have measured blood velocity with MRIs that require a patient to be completely still for up to 90 minutes in order to capture the 20 to 30 slices needed to scan the entire heart. Ultrasound is also sometimes used but other anatomy can make it difficult to see some areas of the heart. Furthermore the images from both are typically 2D, though sometimes 3D.

With the new technology the MRI scan takes only ten minutes, and while wriggly children might need to be sedated patients don’t need to be absolutely still for long periods. From a short procedure scientists can produce remarkable images to measure how fast blood is flowing through various places in the heart and the major arteries around it. Blood flowing through the heart is seen as a bundle of long filaments color-coded to indicate the speed of the flow at various locations in the heart. Blue threads represent a relaxed heart with relatively slow flow such as when sleeping or at rest, while green threads indicate blood flowing faster during contraction. Red and yellow threads show abnormally fast blood flow in patients with heart problems.

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