ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Healthy heart. Magnetic resonance imaging (MRI) scans of axial (horizontal) sections through the human chest, showing a healthy heart (centre of each image). The images, running from left to right and top to bottom, move progressively down the torso. A vertebra of the spine (bottom centre) and the network of blood vessels in the lungs (centre left and right) are seen in each image. The aortic arch (the heart's main artery) is seen in the first image. In the image at centre the pulmonary artery (centre) and the descending aorta (circle) are seen. The heart's atrial chambers are seen in the last image. MRI uses a powerful magnet & radio waves to create "slice" images.
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