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Courtesy of Intermountain Medical Imaging, Boise, Idaho. Figure 1 is a PET scan that shows normal activity in a healthy brain

Positron emission tomography (PET) is a test that uses a special type of camera and a tracer (radioactive substance) to look at

The aorta stems from the heart, arches upward (the aortic arch), and then extends down behind the heart and through the chest (the

The aortic valve has three flaps that work like a one-way gate. When the heart pumps, the aortic valve opens to allow oxygen-rich

In aortic valve regurgitation, the aortic valve does not close completely. The valve lets blood leak back (regurgitate) into the

The medicine is injected directly into the left or right side of the penis at a 90-degree angle. This puts the medicine directly

An applicator is used to insert a small pellet of medicine inside the opening at the end of the penis. The pellet dissolves, and

A vacuum device is a tube made of plastic that fits around the penis to help achieve an erection. The base of the penis is coated

In closed-angle glaucoma, the colored part of the eye (iris) and the lens block the movement of fluid between the chambers of the

Hold on to a table or the back of a chair with your unaffected arm. Then bend forward a little and let your affected arm hang