Third Article:
Mayo Clinic Staff, . "CT Scan ." Mayo Clinic . 12/01/2008. Mayo Foundation for Medical Education and Research, Web. 6 Nov 2009. http://www.mayoclinic.com/health/ct-scan/MY00309.
A CT scan, also called computerized tomography or just CT, is an X-ray technique that produces images of your body that visualize internal structures in cross section rather than the overlapping images typically produced by conventional X-ray exams. This article explains why CT scans are done. Also it explains the risks, how you prepare, what to expect and the results of CT Scan.
Fourth Article:
Mayo Clinic Staff , . "Ultrasound." Mayo Clinic . 27/12/2007. Mayo Foundation for Medical Education and Research, Web. 6 Nov 2009. http://www.mayoclinic.com/health/ultrasound/MY00308
Ultrasound examination, also called sonography or diagnostic medical sonography, is an imaging method that uses high-frequency sound waves to produce precise images of structures within your body. The images produced through ultrasound examination often provide information that's valuable in diagnosing and treating a variety of diseases and conditions. The website also explains the risks, how you prepare, what to expect and the results of ultrasound.
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