Emphysema: Hyperaeration means that the lungs appear more radiolucent on chest x-ray and over expanded. This is due to enlargement of the airspaces caused by destruction of the walls of the alveoli (air sacs).
A radiographer works with medical imaging equipment (particularly X-rays) to create images of patients that a physician may use in diagnosing injuries and disease. They typically work in hospitals, large clinics or as part of a dedicated radiography business that sees referrals for these procedures.
A radiologist is a medical professional who interprets medical images like MRIs, X-rays, CT scans, and ultrasounds. He or she may also use radioactive materials for the purpose of medical imaging, while another related medical specialty focuses on the use of radiation to treat conditions such as cancer.