It is a device that detects objects on a person's body for security screening purposes, without physically removing clothes or making physical contact.
A full-body scanner is a device that detects objects on a person's body for security screening purposes, without physically removing clothes or making physical contact.  With a PET scan you have an injection of a very small amount of a radioactive drug (tracer) first. The amount of radiation is very small and does not make you feel unwell. It only stays in the body for a few hours. Depending on which drug you have, the radioactive drug will travel to particular parts of your body. A PET scan can help to. 1  Show up a cancer. 2  Find out the stage of a cancer. 3  Show whether a lump is cancer or not. 4  Show whether a cancer has spread to other parts of the body. 5  Decide the best treatment for your cancer. 6  Show how well cancer drug treatment is working. A positron emission tomography (PET) scan is an imaging test that allows doctors to check for disease in your body. The scan uses radioactive tracers in a special dye. These tracers are injected into a vein in your arm and are then absorbed by your organs and tissues.  Key Messages: 1  A bone scan is an imaging test that uses a very small amount of a radioactive substance (tracer) to find or monitor cancer that started in the bones or that has spread to the bones from another part of the body. A bone scan is used to examine the bones for damage caused by cancer or another disease. It is a nuclear medicine test, which means that a very small amount of a radioactive substance is used during the procedure. A bone scan is a nuclear imaging test that helps diagnose and track several types of bone disease. Your doctor may order a bone scan if you have unexplained skeletal pain, bone infection or a bone injury that can't be seen on a standard X-ray. A bone scan is also an important tool for detecting cancer that has spread (metastasized) to the bone from the tumor's original location, such as the breast or prostate. 1  Why it's done. Positron Emission Tomography (PET Scan). A positron emission tomography (PET) scan is a unique type of imaging test that helps doctors see how the organs and tissues inside your body are actually functioning. The test involves injecting a very small dose of a radioactive chemical, called a radiotracer, into the vein of your arm. Currently, PET scans are most commonly used to detect cancer, heart problems (such as coronary artery disease and damage to the heart following a heart attack), brain disorders (including brain tumors, memory disorders, seizures) and other central nervous system disorders. The dye makes structures and organs easier to see on the CT pictures. A CT scan can be used to study all parts of your body, such as the chest, belly, pelvis, or an arm or leg. It can take pictures of body organs, such as the liver, pancreas, intestines, kidneys, bladder, adrenal glands, lungs, and heart. It also can study blood vessels, bones, and the spinal cord.  If your full body scan is negative (no signs of disease or cancer), it is important to realize that these results do not guarantee a clean bill of health in the future. If you remain at high risk for certain diseases, you may still develop pathology. Full body scanning is a non-invasive, painless procedure that uses low-dose x-rays to screen the body from the brain to the pelvis for various diseases of the major organs. A bone scan is a nuclear medicine imaging test that uses bone-seeking radioactive materials or tracers (radiopharmaceuticals) and a computer to create an image of the skeleton (bones). A bone scan looks at the bones to see if there are any abnormalities, such as a fracture, tumour or infection.  A full-body scan is a scan of the patient's entire body as part of the diagnosis or treatment of illnesses. If computed tomography (CAT) scan technology is used, it is known as a full-body CT scan, though many medical imaging technologies can perform full-body scans. 
https://en.wikipedia.org/wiki/Full_body_scanner http://www.cancerresearchuk.org/about-cancer/cancers-in-general/tests/pet-scan http://www.healthline.com/health/pet-scan http://www.cancer.net/navigating-cancer-care/diagnosing-cancer/tests-and-procedures/bone-scan http://www.mayoclinic.org/tests-procedures/bone-scan/basics/definition/PRC-20020302 http://my.clevelandclinic.org/services/imaging-institute/imaging-services/hic-pet-scan http://www.webmd.com/a-to-z-guides/computed-tomography-ct-scan-of-the-body http://www.diaxray.com/services/vcu_full_body.html http://www.cancer.ca/en/cancer-information/diagnosis-and-treatment/tests-and-procedures/bone-scan/?region=on https://en.wikipedia.org/wiki/Full-body_CT_scan
what does a body scan detect?