An adjuvant is a substance added to some vaccines to enhance the immune response of vaccinated individuals. The aluminum salts in some U.S. licensed vaccines are aluminum hydroxide, aluminum phosphate, alum (potassium aluminum sulfate), or mixed aluminum salts. For example: aluminum salts are used in DTaP vaccines, the pneumococcal conjugate vaccine, and hepatitis B vaccines.
Most CT departments or centers offer a wide array of computed tomography (CT) imaging examinations. Depending on the type of exam you will receive, the length of the actual procedure will typically be between 10 minutes and 45 minutes. A few involved CT examinations take longer than 45 minutes. Also, many CT exams require the patient to hold their breath several times.
Also, the stroke region may be too small to be seen on CT scan, or it may be in a part of the brain (brain stem or cerebellum) which the CT scan does not image well. Depending on the results of the CT scan, your doctor may wish to obtain additional testing, including an MRI scan. CT scan uses X-rays to take pictures of your skull and brain. The patient lies in a tunnel-like machine while the inside of the machine rotates and takes X-rays of the head from different angles.