Others claimed the scanners created tension between travelers and TSA officers. The agency said 1% of travelers have opted for pat-downs to avoid the machines. TSA says the scanners add another layer of security at checkpoints besides metal detectors, explosives-detection systems and bomb-sniffing dogs.
https://www.usatoday.com/story/news/2016/03/02/tsa-defends-full-body-scanners-airport-checkpoints/81203030/
TSA defends full-body scanners at airport checkpoints TSA justifies full-body scanners at airport checkpoints as “the most effective and least intrusive” way to search travelers for weapons hidden under their clothes.
https://www.usatoday.com/story/news/2016/03/02/tsa-defends-full-body-scanners-airport-checkpoints/81203030/
TSA defends full-body scanners at airport checkpoints. WASHINGTON – Three years, more than 1,000 comments and multiple challenges by advocacy groups later, the Transportation Security Administration issued a rule Wednesday finalizing its policy for using full-body scanners at airports.
https://www.usatoday.com/story/news/2016/03/02/tsa-defends-full-body-scanners-airport-checkpoints/81203030/
TSA defends full-body scanners at airport checkpoints. TSA justifies full-body scanners at airport checkpoints as “the most effective and least intrusive” way to search travelers for weapons hidden under their clothes. 
https://www.usatoday.com/story/news/2016/03/02/tsa-defends-full-body-scanners-airport-checkpoints/81203030/
A CT scan can reveal tumors, abnormal tissue, and problems with arteries. A scan of the head can provide important information about the brain, for instance, if there is any bleeding, swelling of the arteries, or a tumor.
https://www.medicalnewstoday.com/articles/153201.php
A CT scan can reveal a tumor in the abdomen, and any swelling or inflammation in nearby internal organs. It can show any lacerations of the spleen, kidneys, or liver. As a CT scan detects abnormal tissue, it is useful for planning areas for radiotherapy and biopsies, and it can provide valuable data on blood flow and other vascular conditions. It can help a doctor assess bone diseases, bone density, and the state of the patient's spine.
https://www.medicalnewstoday.com/articles/153201.php
The full-body scanners used in all airports since May 2013 are called millimeter wave machines, which bounce electromagnetic waves off the traveler to provide an animated image where a suspicious item might be located. The TSA no longer uses the backscatter scanners that produced near-naked images of travelers.
https://www.usatoday.com/story/news/2016/03/02/tsa-defends-full-body-scanners-airport-checkpoints/81203030/
This is different from an X-ray machine, which sends just one radiation beam. The CT scan produces a more detailed final picture than an X-ray image. The CT scanner's X-ray detector can see hundreds of different levels of density. It can see tissues within a solid organ.
https://www.medicalnewstoday.com/articles/153201.php
A scanner is a digital device that converts films, documents and photographic prints to digital images. It scans documents, which can be sent to a computer, printer, flash drive or email address. Continue Reading.
https://www.reference.com/technology/function-scanner-18d7ebf1338fc685
A scanner is a digital device that converts films, documents and photographic prints to digital images. It scans documents, which can be sent to a computer, printer, flash drive or email... A scanner is a digital device that converts films, documents and photographic prints to digital images. It scans documents, which can be sent to a computer, printer, flash drive or email address. Scanned files can be stored on a computer’s hard drive, flash drive or shared network folders.
https://www.reference.com/technology/function-scanner-18d7ebf1338fc685
what are scanners
A scanner is a digital device that converts films, documents and photographic prints to digital images.