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1 The use of cone-beam computed tomography in dentistry : An advisory statement from the American Dental Association Council on Scientific Affairs The American Dental Association Council on Scientific Affairs JADA 2012;143(8): The following resources related to this article are available online at jada.ada.org ( this information is current as of August 15, 2012): Updated information and services including high-resolution figures, can be found in the online version of this article at: This article cites 8 articles, 2 of which can be accessed free: Information about obtaining reprints of this article or about permission to reproduce this article in whole or in part can be found at: Downloaded from jada.ada.org on August 15, 2012 Reproduction or republication strictly prohibited without prior written permission of the American Dental Association.
2 The use of cone-beam computed tomography in dentistry An advisory statement from the American Dental Association Council on Scientific Affairs The American Dental Association Council on Scientific Affairs The emergence of cone-beam computed tomography (CBCT) has expanded the field of oral and maxillofacial radiology. CBCT imaging provides three-dimensional volumetric data construction of dental and associated maxillofacial structures with isotropic resolution and high dimensional accuracy. A CBCT scanner uses a collimated x-ray source that produces a cone- or pyramid-shaped beam of x- radiation, which makes a single full or partial circular revolution around the patient, producing a sequence of discrete planar projection images using a digital detector. These two-dimensional images are reconstructed into a three-dimensional volume that can be viewed in a variety of ways, including cross-sectional images and volume renderings of the oral anatomy. Although CBCT units produce a higher radiation dose than one would receive from a single traditional dental radiograph, the radiation dose delivered typically is less than that produced during a medical multichannel computed tomographic scan. CBCT radiation doses also vary widely according to the device used, x-ray energy and filtration, tolerance for image noise and motion artifacts, and the size of the imaging area (field of view [FOV]) that is used to acquire volumetric data 1-3 (Table, 2,4,5 page 901). Since CBCT devices were introduced commercially in the United States in 2001, dentists have come to use the technology in increasing numbers. Yet, A B S T R A C T Background and Overview. The American Dental Association Council on Scientific Affairs (CSA) promotes safe use of conebeam computed tomography (CBCT) and appropriate professional justification of CBCT imaging procedures. The CSA reviewed the current research literature to develop collaborative guidance regarding the use of CBCT in dentistry with input from a broad group of stakeholder organizations. The Council s principles for CBCT safety may be applied to any number of potential dental CBCT imaging applications. Practice Implications. As with other radiographic modalities, CBCT imaging should be used only after a review of the patient s health and imaging history and the completion of a thorough clinical examination. Dental practitioners should prescribe CBCT imaging only when they expect that the diagnostic yield will benefit patient care, enhance patient safety or improve clinical outcomes significantly. Key Words. Radiation protection; professional practice; dental radiography; cone-beam computed tomography. JADA 2012;143(8): Address reprint requests to the Council on Scientific Affairs, American Dental Association, 211 E. Chicago Ave., Chicago, Ill JADA 143(8) August
3 although CBCT technologies have advanced rapidly across time, concerns have been expressed about whether the information acquired with CBCT imaging warrants the additional exposure risk, as well as about the level of training, education and experience required to interpret the CBCT data set. 1 To provide guidance on CBCT imaging, national and international groups have prepared basic principles, 1 position statements 6,7 and professional guidelines for CBCT use. 4,8 Recommendations for adequate operator education regarding use and interpretation of CBCT imaging also have been published. 1,6 In addition, CBCT guidance documents are being developed by dental specialty organizations. 9 As with any clinical guidance regarding the acquisition of diagnostic information, dentists must keep in mind their primary ethical obligation to protect patients from harm. Consistent with its mission to serve as a primary resource on the science of dentistry, the ADA Council on Scientific Affairs (CSA) reviewed the current science, guidance and other resources available from professional organizations to prepare this advisory statement of principles for the safe use of CBCT in dentistry. The Council then sought comments and input from a range of stakeholder organizations (listed in the acknowledgments at the end of this article) to develop this collaborative guidance statement for the profession. PRINCIPLES FOR THE SAFE USE OF DENTAL AND MAXILLOFACIAL CONE- BEAM COMPUTED TOMOGRAPHY The Council recommends adherence to the following principles for the safe and appropriate use of CBCT in clinical practice. das with other radiographic modalities, CBCT imaging should be used only after a review of the patient s health and imaging history and completion of a thorough clinical examination. din accordance with the National Council on Radiation Protection & Measurements 10 (NCRP s) Report No. 145 and standard selection criteria for dental radiographs, 11 clinicians should perform radiographic imaging, including CBCT, only after professional justification that the potential clinical benefits will outweigh the risks associated with exposure to ionizing radiation. All radiographic examinations should be indicated clinically and justified appropriately, and such examinations should not be performed for screening purposes. Additional considerations should be weighed prior to the exposure of children and adolescents. These patients are more radiosensitive (that is, their cancer risk per unit dose of ionizing radiation is higher), and they have a longer lifetime risk of developing radiation-induced cancers. 12,13 dthe clinician should prescribe traditional dental radiographs and CBCT scans only when he or she expects that the diagnostic yield will benefit patient care, enhance patient safety, significantly improve clinical outcomes or all of these. dcbct should be considered as an adjunct to standard oral imaging modalities. CBCT may supplement or replace conventional (twodimensional or panoramic) dental radiography for the diagnosis, monitoring and treatment of oral disease or the management of oral conditions when, in the clinician s decision-making process, he or she determines that oral anatomical structures of interest may not be captured adequately by means of conventional radiography. din accordance with the as-low-as-reasonablyachievable (ALARA) principle, radiation dose for dental patients should be optimized to achieve the lowest practical level to address a specific clinical situation. (Author s note: Dose optimization means delivering a radiation dose to the organs and tissues of clinical interest no greater than that required for adequate imaging and minimizing the dose to other structures. The patient s radiation dose is considered to be optimized when imaging is performed with the least amount of radiation required to provide adequate image quality. The goal of every imaging procedure is to provide images adequate for the clinical purpose. What constitutes adequate image quality depends on the modality being used and the clinical question being asked.) The clinician should limit the radiation dose for CBCT scans by optimizing image quality, using the smallest FOV necessary for imaging a specific anatomical area of interest and using the lowest combination of tube output and scan time (in milliamperes) consistent with adequate image noise content and motion artifact. dcbct operators should take every precaution to reduce radiation dose and ensure the patient s safety during CBCT imaging. The use of thyroid collars and lead aprons is recommended in the NCRP s 10 radiation safety guid- ABBREVIATION KEY. ADA: American Dental Association. ALARA: As low as reasonably achievable. CBCT: Cone-beam computed tomography. CSA: Council on Scientific Affairs. FOV: Field of view. NCRP: National Council on Radiation Protection & Measurements. 900 JADA 143(8) August 2012
4 TABLE Effective dose estimates for common dental radiographic examinations and cone-beam computed tomographic (CBCT) imaging.* ance for the dental profession. However, it is neither possible nor desirable to use these protective devices in all clinical situations, especially in cases in which the collar or apron may obstruct the area of interest. Protective thyroid collars and lead aprons should be used when they will not interfere with the examination. da CBCT examination should be prescribed by a dentist who has appropriate training and education in CBCT imaging, including an understanding of the significance of CBCT selection and imaging findings. dcbct images of the oral and maxillofacial structures that are the subject of the CBCT examination should be evaluated by a dentist with appropriate training and education in CBCT interpretation. (Author s note: Establishing formal standards for CBCT training and education is beyond the scope of this CSA advisory statement. The Council will share the statement with the Commission on Dental Accreditation and other educational groups for further consideration.) dregardless of the primary purpose for the selection of CBCT, the complete image data set must be interpreted by an appropriately qualified health care provider (such as a dentist or a physician). The prescribing clinician should receive a thorough radiological report. If the prescriber also interprets the CBCT images, he or she should enter the findings into the patient record and communicate them appropriately to the patient or, if the patient is a minor, to the patient s parent or legal guardian. ddental practitioners who use CBCT devices must receive appropriate training and education in the safe use of CBCT imaging systems. Although there may be instances in which training provided by vendors of CBCT systems is appropriate, dental practitioners should consider the source of the information concerning radiation safety. The Council encourages CBCT operators to participate in continuing education courses to maintain adequate knowledge regarding radiation protection in the dental care setting. IMAGING TECHNIQUE EFFECTIVE DOSE Conventional Radiography Four-image posterior bitewings with photo-stimulable phosphor (PSP) 5.0 or F-speed film and rectangular collimation Panoramic radiograph with charge-coupled device Cephalometric radiograph, posteroanterior or lateral with PSP Full-mouth radiographs With PSP storage or F-speed film and rectangular collimation 34.9 With PSP or F-speed film and round collimation CBCT Dentoalveolar CBCT (small and medium field of view [FOV]) (61) Maxillofacial CBCT (large FOV) (87) * Estimates for adult patients based on data from Pauwels and colleagues, 2 The SEDENTEXCT Project 4 and Ludlow and colleagues. 5 Measured in microsieverts. Median values for effective dose provided parenthetically. ddentists must abide by applicable federal and state regulations in the provision of dental imaging modalities. This includes following regulations or guidance to ensure a safe working environment for both the staff and the public in relation to CBCT equipment and other sources of ionizing radiation. CBCT unit operators should contact state and local radiation control programs to verify any additional requirements for operation of CBCT, including applicable requirements for licensure or accreditation. ddentists should use professional judgment in the prescription and performance of CBCT examinations by consulting recommendations from available CBCT guidelines and by considering the specific clinical situation and needs of the individual patient. Given the ongoing development and research in this technology, dentists should stay abreast of the scientific literature and apply an evidence- and science-based approach to the use of CBCT. dthis advisory statement calls for appropriate agencies within the ADA and the dental community at large to develop and implement recommendations and criteria for adequate CBCT training and education of dentists or other CBCT unit operators. These recommendations should include but not be limited to patient evaluation, radiation protection, selection of appropriate CBCT imaging parameters, performance of the CBCT examination and image interpretation. The recommendations also must include requirements for predoctoral dental education programs and for continuing education coursework and training. dfacilities considering the installation of JADA 143(8) August
5 CBCT devices should consult a health physicist (or other qualified expert) to perform a shielding analysis based on NCRP reports 145 and ,14 dfacilities using CBCT systems should consult a health physicist (or other qualified expert) to perform equipment performance and compliance evaluations initially at installation and then follow a schedule in compliance with local, state and federal requirements. The Council recommends that a performance evaluation be completed at least annually. The evaluations should include patient dose estimation to assist the facility with patient dose management. dstaffs of facilities using CBCT should establish a quality control program. This program can be based on the manufacturer s recommendations or can be established, implemented and monitored by a qualified expert. SUMMARY CBCT technologies offer an advanced point-ofcare imaging modality that clinicians should use selectively as an adjunct to conventional dental radiography. The selection of CBCT for dental and maxillofacial imaging should be based on professional judgment in accordance with the best available scientific evidence, weighing potential patient benefits against the risks associated with the level of radiation dose. Clinicians must apply the ALARA principle in protecting patients and staff during the acquisition of CBCT images. This includes appropriate justification of CBCT use, optimizing technical factors, using the smallest FOV necessary for diagnostic purposes and using appropriate personal protective shielding. Disclosure. Members of the American Dental Association Council on Scientific Affairs (CSA) are required to maintain a current conflict-of-interest disclosure to participate in CSA activities. No potential conflicts of interest relevant to this statement were reported. The American Dental Association (ADA) Council on Scientific Affairs gratefully acknowledges Dr. John Ludlow, professor, School of Dentistry, University of North Carolina, Chapel Hill, and Dr. Sharon Brooks, professor emerita, School of Dentistry, University of Michigan, Ann Arbor, for their assistance in finalizing this advisory statement. The ADA expresses its appreciation to the following organizations for their significant contributions to the statement: the American Academy of Oral and Maxillofacial Pathology; the American Academy of Oral and Maxillofacial Radiology; the American Academy of Pediatric Dentistry; the American Academy of Periodontology; the American Association of Endodontists; the American Association of Oral and Maxillofacial Surgeons; the American Association of Orthodontists; the American Association of Physicists in Medicine; the Conference of Radiation Control Program Directors; the National Council on Radiation Protection & Measurements; and the U.S. Food and Drug Administration. 1. Horner K, Islam M, Flygare L, Tsiklakis K, Whaites EJ. Basic principles for use of dental cone beam computed tomography: consensus guidelines of the European Academy of Dental and Maxillofacial Radiology. Dentomaxillofac Radiol 2009;38(4): Pauwels R, Beinsberger J, Collaert B, et al; SEDENTEXCT Project Consortium. Effective dose range for dental cone beam computed tomography scanners. Eur J Radiol 2012;81(2): Ludlow JB, Ivanovic M. Comparative dosimetry of dental CBCT devices and 64-slice CT for oral and maxillofacial radiology. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2008;106(1): The SEDENTEXCT Project. Radiation Protection: Cone Beam CT for Dental and Maxillofacial Radiology: Evidence Based Guidelines 2011 (v2.0 Final). Accessed May 11, Ludlow JB, Davies-Ludlow LE, White SC. Patient risk related to common dental radiographic examinations: the impact of 2007 International Commission on Radiological Protection recommendations regarding dose calculation. JADA 2008;139(9): Carter L, Farman AG, Geist J, et al; American Academy of Oral and Maxillofacial Radiology. American Academy of Oral and Maxillofacial Radiology executive opinion statement on performing and interpreting diagnostic cone beam computed tomography. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2008;106(4): Joint Position Statement of the American Association of Endodontists and the American Academy of Oral and Maxillofacial Radiology. Use of cone-beam computed tomography in endodontics. paper_cb.pdf. Accessed July 10, Academy of Osseointegration guidelines of the Academy of Osseointegration for the provision of dental implants and associated patient care. Int J Oral Maxillofac Implants 2010;25(3): Scarfe WC. All that glitters is not gold : standards for conebeam computerized tomographic imaging (published online ahead of print Feb. 3, 2011). Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2011;111(4): doi: /j.tripleo National Council on Radiation Protection & Measurements. Radiation Protection in Dentistry (Report No. 145). Bethesda, Md.: NRCP Publications; American Dental Association; U.S. Department of Health and Human Services. The Selection of Patients for Dental Radiographic Examinations. Chicago: American Dental Association; topics_radiography_examinations.pdf. Accessed May 11, National Research Council of The National Academies, Committee to Assess Health Risks from Exposure to Low Levels of Ionizing Radiation, Board of Radiation Effects Research, Division on Earth and Life Studies Health Risks From Exposure to Low Levels of Ionizing Radiation: BEIR VII phase 2. Washington: National Academy of Sciences, National Academies Press; International Commission on Radiological Protection. The 2007 Recommendations of the International Commission on Radiological Protection (publication 103). Ann ICRP 2007;37(2-4): National Council on Radiation Protection & Measurements. Structural Shielding Design for Medical Imaging Facilities (Report No. 147). Bethesda, Md.: NRCP Publications; JADA 143(8) August 2012
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