UV, or ultraviolet, rays are the sun's invisible burning rays. They can cause sunburns, and in some cases skin cancer. There are three types of UV rays: UVB: Are the primary cause of sun burning, premature aging of the skin and the development of skin cancer.UVC: Are blocked by the ozone layer and do not reach the earth's surface.hey can cause sunburns, and in some cases skin cancer. There are three types of UV rays: UVB: Are the primary cause of sun burning, premature aging of the skin and the development of skin cancer. UVC: Are blocked by the ozone layer and do not reach the earth's surface.
About the IAC. The Intersocietal Accreditation Commission (IAC) provides accreditation programs for vascular testing, echocardiography, nuclear/PET, MRI, diagnostic CT, dental CT, carotid stenting, vein treatment and management and cardiac electrophysiology.
Abstract. 1  Background and objectives: Intracranial artery calcification (IAC) is frequently observed on brain computed tomography (CT) scans in stroke patients. This retrospective study was designed to determine the prevalence, risk factors, and clinical relevance of IAC in a cohort of patients with ischemic stroke.