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This research is to compare noise and quantity of exposed ray at abdomen with two medical equipment company, GE and Siemens. As well as figuring out which one has high or low quantity of exposed ray and advantages of each equipment in certain areas. This research used SIEMENS (Somatom Definition Flash, Germany) and GE (Discovery CT 750 HD, USA) in ‘C’ University as CT equipments. For dummy, this research used Rando phantom (Art-20x fluke biomedical, USA) in condition of care dose 4D and care Kv System with Siemens and GE respectively. For slice thickness, this research used 3 mm for Siemens and 3.75 mm for GE and scanned abdomen 4 times with same FOV 38 cm and 80, 100, 120, 140 kVp. This research is to figure out correlation between noise and quantity of rays from changes of tube voltage in each company’s equipment for abdominal phantom. Also this paper got the results that average value of noise decreases and values of CTDlvol and DLP increases by increasing tube voltage to 80, 100, 120, 140 kVp respectively. From above research, there is a difference in quantity of ray for patients by type of equipment, even scanning same area. Therefore, there should be appropriate management criteria. With this perception, the limitation of this research used only two different companies’ equipment and used standardized phantom that excludes different characteristics by each patient. To increase quality of image with decreasing unnecessary quantity of rays, there should be additional technology development.
