1. 1)Department of Health and Human Services, Food and Drug Administration, Cord of federal Regulations 21 CFR 1020.33: Performance standard for ionizing radiation emitting products-diagnostic x-ray system and their major components computed tomography (CT) equipment. 1984.
2. 2)IEC 60601-2-44 Edition 1: Medical electrical equipment-Part 2-44: Particular requirements for the basic safety and essential performance of X-ray equipment for computed tomography, Switzeland, 1999.
3. 3)European Commission: European Guidelines on Quality Criteria for Computed Tomography. EUR 16262 EN. 2000.
4. 4)ICRP Publication 87: Managing patient dose in computed tomography. Annals of the ICRP 2000.
5. 5)IEC 60601-2-44 Edition 2: Medical electrical equipment-Part 2-44: Particular requirements for the basic safety and essential performance of X-ray equipment for computed tomography, Switzeland, 2002.