Approved for cancer. Pet scan are approved for staging, response assessment and surveillance of certain types of cancers. However, any pathologic process that augments the consumption of glucose (such as infection or inflammation) can be evaluated, though these indications are not currently covered. In addition, pet scans are used to evaluate for brain cognitive disorder, heart ischemia and myocardial viability.
Pet. The most common Pet scan use is for oncologic reasons however it can be used for many applications. FDG (labeled glucose) is the most common tracer and glucose metabolism can be measured which can be increased in inflammatory, infectious, or malignant conditions. Pet can also be used to evaluate the heart for ischemia or brain for dementia.
Usually cancer. A pet/ct scan is usually used to image glucose metabolism in people with cancer to identify the extent of the cancer. It can also be used to image the heart for cardiac evaluation. In addition, the pet bone scan can be used to image calcium metabolism which can be altered in many disease, most prominently bony metastatic cancer.
Cancer usually. The most common illnesses studied are various types of cancer. Frontal temporal lobe dementia can be differentiated from alzheimers disease from lewy body dementia also.
CT's define. Anatomy; pet's assess energy consumption (metabolism). Put them together and you see what is bigger than it supposed to be, what's in the neighborhood, and what consumes energy...And the price and cost are quite high.
Physiology of lesion. Pet scans most often use a radioactive form of glucose, the energy source for most of the cells in our bodies. The pet scanner can detect and measure how much of the radioactive glucose analog, f-18 fdg, is in a particular organ or region. The areas using more glucose are hyper metabolic and generally more worrisome. Our brains and sometimes hearts prefer glucose as food, making it hard to see.
PET tracers. There are many pet tracers which can be used for different indications. Some indications include cardiac perfusion, oncologic imaging, and beta amyloid plaque imaging for alzheimer's. Most commonly the FDG (glucose) tracer is used for oncologic purposes.
Several uses. In most cases PET CT scan is used for detecting metatases in the body. It can also be used for brain with mets, primary tumors, and epilepsy. Injection of glucose metabolite F18 FDG goes to malignant lesions that are highly metabolic, . Usually more sensitive for detecting smaller lesions. Used in staging malignancies and following patient's response to chemotherapy and radiation.