Heart and torso blood vessels. Coloured 3D frontal magnetic resonance angiography (MRA) scan of a healthy heart and blood vessels in the chest, neck, arms and upper abdomen of a 39-year-old woman. The heart is at centre, with its major blood vessels (including the aorta and vena cava). AT bottom centre are the kidneys. The blood vessels of the neck and arms are at top centre and upper left and upper right. MRA is a type of magnetic resonance imaging (MRI) technique that highlights blood vessels without the need for X-rays or the injection of a radio-opaque dye.