Ligaments attach your breasts to the pectoral muscle on your chest. When you wear a bra, your supported breast does not allow the pectoral muscle to be exercised as much as it could be. When you do not wear a bra, as you move your arms, reach, and lift, your pectoral muscle is strengthened.
Positron emission tomography. Positron emission tomography (PET) is a nuclear medicine functional imaging technique that is used to observe metabolic processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron-emitting radionuclide (tracer), which is introduced into the body on a biologically active molecule.
A PET scan (positron emission tomography) is an imaging test that can help reveal how your tissues and organs are functioning. To show this chemical activity, a small amount of radioactive material must enter your body.ET scan is often combined with other imaging tests, such as CT scan and MRI. The combination of the tests improves the clarity of the images and makes it easier for the physician to interpret the results.