1. CT SCANS Malari Lapp

2. Who?  Godfrey Hounsfield  Left school  Had no qualifications  Awarded Nobel Prize in 1979

3. When?  Developed in 1972  Revolutionized diagnostic medicine  First only developed for head scans  Took days to construct a single image

4. What  Computed Tomography (CT) imaging is also known as "CAT scanning" (Computed Axial Tomography).  Tomography is from the Greek word "tomos" meaning "slice" or "section"  "graphia" meaning "describing".

5. Why  For diagnostic purposes  Doctors wanted a better way to look at the inside of people  Noninvasive  Better for the patient

6. How it works  Produce X-rays  Visible light photons  High energy levels allow beams to pass through the body

7. ...  Patient lies down on a platform  Slowly moves through the machine  Motor turns X-ray tube  Revolve around body

8. Preparation  There are a few things a patient may be asked to do  Drink something  Avoid certain foods  Dye injected

9. Risks?  CT scans expose the patient to radiation.  a single CT scan subjects the human body to between 150 and 1,100 times the radiation of a conventional x-ray  29,000 future cancer cases could be attributed to the 72 million CT scans performed in the country in 2007

10. Citation  " How Much Do CT Scans Increase the Risk of Cancer?" Scientific American Global RSS. N.p., n.d. Web. 09 Nov. 2014.  "CT Scan." Definition. N.p., n.d. Web. 08 Nov. 2014.  "Body CT (CAT Scan)." Body CT (CAT Scan). N.p., n.d. Web. 09 Nov. 2014.  http://www.encyclopedia.com/topic/CAT_scan.aspx http://www.encyclopedia.com/topic/CAT_scan.aspx  http://www.medicinenet.com/cat_scan/article.htm http://www.medicinenet.com/cat_scan/article.htm