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It explains why CT is used to diagnose and monitor conditions while addressing public concerns about cancer risk. The paper distinguishes well-established high-dose radiation risks from uncertain very-low-dose risks in diagnostic imaging, and outlines how authorities use exposure extrapolation and the ALARA principle to minimize potential harm. It emphasizes justification, especially for paediatric imaging.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/computed-tomography-and-radiation-risks-version-2-position-paper-guidance/446154/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/computed-tomography-and-radiation-risks-version-2-position-paper-guidance/446154.png","ImageObject",300,407,{"name":92,"@type":93},"Jasmine","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-31","2026-09-29",true,{"@type":102,"interactionType":103,"userInteractionCount":52},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is the purpose and scope of the CT and radiation risks position paper?","Question",{"text":112,"@type":113},"It provides guidance on computed tomography and radiation risks for the College, fellows, members, and other individuals, covering the rationale for safe and appropriate CT use and the risks involved.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How does the paper compare high-dose and diagnostic CT radiation risks?",{"text":117,"@type":113},"High-dose radiation risks are well known, including an increased chance of cancer. In contrast, the risks from the very low radiation levels used in diagnostic CT imaging are uncertain and debated among experts.",{"name":119,"@type":110,"acceptedAnswer":120},"What principles and steps does the policy recommend for CT use?",{"text":121,"@type":113},"CT should be performed only when medical benefit outweighs associated risk and alternative methods without radiation cannot provide the needed clinical information. The paper also promotes justification and uses the ALARA principle with optimization to keep radiation doses as low as reasonably achievable.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},446154,1790922157,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":52,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":19,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":52,"preview_page_count":4},2336478487870,"https://ap-avatar.wpscdn.com/davatar_085a072bc5b1113ac321206ff7593b45","Computed Tomography and Radiation Risks  \nVersion: 2.0  \nApproved by: Faculty of Clinical Radiology Council  \nDate of approval: 16 February 2018  \n1. INTRODUCTION  \n1.1 Purpose  \nThis position paper has been developed to give guidance to The Royal Australian and New Zealand College of Radiologists® (ABN 37 000 029 863) (the College), Fellows, Members and other individuals on computed tomography and radiation risks.  \n1.2 Scope  \nThe mission of The Royal Australian and New Zealand College of Radiologists is to drive the appropriate, proper and safe use of radiological and radiation oncological medical services for optimum health outcomes by leading, training and sustaining our professionals.  \n1.3 Background  \nComputed Tomography (CT) scanners use low levels of radiation to help diagnose and monitor a wide array of conditions such as cancer, stroke and traumatic injuries. In Australia and New Zealand, CT utilisation has increased substantially over the last two decades as the technology has become more sophisticated, frequently replacing invasive, less accurate or higher risk alternatives such as exploratory surgery. Over this time, there has also been significant technology improvement, enabling scanners to deliver higher quality images with lower radiation doses.  \nRecent news reports have highlighted concerns regarding the potential risk of cancer from CT scanning.  \n2. DEFINITIONS  \nIn this Computed Tomography and Radiation Risks Position Paper:  \nCollege means The Royal Australian and New Zealand College of Radiologists Member means a member of the College.  \n3. RISK IN CONTEXT  \nThe risks from exposure to high-dose radiation are well known. This can occur in the context of nuclear bomb explosion and accidents involving nuclear facilities (Chernobyl, for example) and involves, among other risks, an increased chance of developing cancer.  \nHowever, the risks from the very low level radiation that is employed in diagnostic CT imaging  \nare uncertain and continue to be debated among experts in the field. For example, there have been no large scale prospective epidemiologic studies that would allow confirmation or  \nHead Office: Level 9, 51 Druitt Street, Sydney NSW 2000, Australia Ph: +61 2 9268 9777 Email: [ranzcr@ranzcr.com](ranzcr@ranzcr.com)[ ](ranzcr@ranzcr.com)New Zealand Office: Floor 6, 142 Lambton Quay, Wellington 6011, New Zealand Ph: +64 4 472 6470 Email: [nzbranch@ranzcr.com](nzbranch@ranzcr.com)  \n[Web: www.ranzcr.com](Web: www.ranzcr.com) ABN 37 000 029 863  \nquantification of the amount of risk conferred to an individual from a single CT scan. Although these studies are in progress in a number of countries, even if a very small increase in risk is demonstrated, it will take a large number of patients and many years of follow up to prove this.  \nTherefore, our current “best guess” about the possible risks of low levels of radiation from diagnostic imaging are extrapolated from higher dose exposures such as those experienced by people who lived some distance from the epicentre of the atomic bomb blasts in Nagasaki and Hiroshima, and who were followed to determine whether they developed cancer years later. Because of the uncertainty about this extrapolation, radiation protection authorities recommend that we should regard low doses of radiation as potentially harmful and we should minimise radiation exposure whenever possible to balance potential risk against benefit to the patient. This is particularly important with regard to paediatric imaging examinations as radiation risk is higher in children and young adults because their cells are dividing more rapidly and so are more susceptible to damage from radiation.  \nIt is important also to remember that all of us are exposed to radiation every day. This is mostly from natural radiation in the soil, rocks, air and cosmic radiation from space. The level of this background radiation varies considerably, depending on geographic location. We are also exposed on a daily ","cbCaiq2qxcS43eb7","https://ap.wps.com/l/cbCaiq2qxcS43eb7","pdf",198718,"English","# Introduction\n## Purpose\n## Scope\n## Background\n# Definitions\n# Risk in Context\n# Policy Procedures on Computed Tomography","[{\"question\":\"What is the purpose and scope of the CT and radiation risks position paper?\",\"answer\":\"It provides guidance on computed tomography and radiation risks for the College, fellows, members, and other individuals, covering the rationale for safe and appropriate CT use and the risks involved.\"},{\"question\":\"How does the paper compare high-dose and diagnostic CT radiation risks?\",\"answer\":\"High-dose radiation risks are well known, including an increased chance of cancer. In contrast, the risks from the very low radiation levels used in diagnostic CT imaging are uncertain and debated among experts.\"},{\"question\":\"What principles and steps does the policy recommend for CT use?\",\"answer\":\"CT should be performed only when medical benefit outweighs associated risk and alternative methods without radiation cannot provide the needed clinical information. The paper also promotes justification and uses the ALARA principle with optimization to keep radiation doses as low as reasonably achievable.\"}]","Computed Tomography and Radiation Risks - Version 2 - Position Paper guidance | PDF",1790714328]