Areas of the lungs outside the alveoli where gas exchange with the blood does not take place. During adulthood, explain why vital capacity changes with age. As one ages, the elastic fibers in the lung gradually decrease as well. elastance and greater compliance of the lungs.
Brain aneurysm: An mri/mra of the brain is an excellent screening test for the detection of even small (2-3 mm) brain aneurysms. Some neurosurgeons may recommend a ct angiogram of the brain or even a cerebral angiogram to be absolutely sure of the initial test results. Discuss the best option for you with a cerebrovascular neurosurgeon.
Types of X-rays and Scans. MRA (Magnetic Resonance Angiography) MRAâa type of magnetic resonance imaging (MRI) study that is obtained with the same scanning machineâuses a strong magnetic field combined with radiofrequency waves to create highly detailed images of blood vessels in the body. (MRA is most often used to examine vessels in the brain, neck, kidneys, and legs.) The resulting scans, which provide information about blood flow and the condition of blood vessel walls, may then be saved on a computer or on film and examined for abnormalities.