Broca's area is closely related to Wernicke's area. It, too, works with spoken language and was actually discovered before Wernicke's area. Both of these areas are found on the same side of the brain, usually the left.
Intravenous dye may be used in some imaging procedures (e.g., CT scan, MRI scan). Contrast dye is not used in all cases.Although rare, some patients suffer allergic reactions to the dye and newer contrast agents are quite expensive.he primary risk of a CT scan is radiation. If intravenous contrast is used, there is a risk for allergic reaction as well. Overall, the risks of CT are small.
There are four types of contrast agent used in CT: 1  The type that is given via intravenous (through a vein) injection. 2  The type that is given orally. 3  The type that is given rectally. 4  A much less common type of contrast used in CT is inhaled as a gas and used for special lung and brain imaging.