Helical CT (also called spiral CT) has several advantages over older CT techniques: it is faster, produces better quality 3-D pictures of areas inside the body, and may detect small abnormalities better. As with standard colonoscopy, a thorough cleansing of the colon is performed before this test. Computed tomography (CT) is most commonly used in equine practice for osseous studies (eg, complex fractures, sequestrum identification, the skull), but recent work has documented the utility of CT for soft tissue evaluation.. Learn computed tomography terminology with free interactive flashcards. Tomography definition is - a method of producing a three-dimensional image of the internal structures of a solid object (such as the human body or the earth) by the observation and recording of the differences in the effects on the passage of waves of energy impinging on those structures. The mathematical basis for … Computed tomography (CT) is an imaging procedure that uses special x-ray equipment to create detailed pictures, or scans, of areas inside the body. Mathews JD, Forsythe AV, Brady Z, et al. Many different "snapshots" (angles) are collected during one complete rotation. PLAY. Such advances allow relatively larger volumes of anatomy to be imaged in relatively less time. Purpose. The widespread use of CT and other procedures that use ionizing radiation to create images of the body has raised concerns that even small increases in cancer risk could lead to large numbers of future cancers (2, 3). Not having the procedure can be much more risky than having it, especially if CT is being used to diagnose cancer or another serious condition in someone who has signs or symptoms of disease. As a result, the EBCT scanner allows a quicker image acquisition than conventional CT scanners. A single rotation takes about 1 second. Combined PET/CT uses two imaging methods, CT and positron emission tomography (PET), in one procedure. The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely. Figure 2: Cross-sectional Image of AbdomenAlthough also based on the variable absorption of x rays by different tissues, computed tomography (CT) imaging, also known as \"CAT scanning\" (Computerized Axial Tomography), provides a different form of imaging known as cross-sectional imaging. computed tomography n noun: Refers to person, place, thing, quality, etc. In addition, whole-body CT can expose people to relatively large amounts of ionizing radiation—about 12 mSv, or four times the estimated average annual dose received from natural sources of radiation. Explain the importance of the slip ring on diagnostic CT scanners. Detectors on the exit side of the patient record the x rays exiting the section of the patient's body being irradiated as an x-ray "snapshot" at one position (angle) of the source of x rays. Radiation exposure from CT scans affects adults and children differently. The unit of CTDI is the gray (Gy) and it can be used in conjunction with patient size to estimate the absorbed dose. Depending on the amount absorbed in a particular tissue such as muscle or lung, a different amount of x rays will pass through and exit the body. The Image Wisely website provides resources and information to radiologists, medical physicists, other imaging practitioners, and patients. Computed tomography definition, computerized axial tomography. Tracking radiation exposure from diagnostic imaging devices at the NIH. A computed tomography (CT or CAT) scan allows doctors to see inside your body. If the test is clinically justified, then the parents can be reassured that the benefits will outweigh the small long-term risks. Definition of computed tomography in the Definitions.net dictionary. The term “ computed tomography ”, or CT, refers to a computerized x-ray imaging procedure in which a narrow beam of x-rays is aimed at a patient and quickly rotated around the body, producing signals … People who think they might qualify for screening with low-dose helical CT should discuss the appropriateness and the benefits and risks of lung cancer screening with their doctors. Cancer risk in 680 000 people exposed to computed tomography scans in childhood or adolescence: data linkage study of 11 million Australians. Computerized tomography definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. 180-degree linear interpolation (180LI) an algorithm used for MSCT image recon in which data acquired from a shorter distance (180 degrees) away from the reconstructed slice location are interpolated. In addition, many CT systems are capable of imaging multiple slices simultaneously. In very rare cases, the contrast agents used in CT can cause allergic reactions. The CT scan can reveal anatomic details of internal organs that cannot be seen in conventional X-rays. Radiation exposure from CT scans in childhood and subsequent risk of leukaemia and brain tumours: a retrospective cohort study. A procedure that uses a computer linked to an x-ray machine to make a series of detailed pictures of areas inside the body. NCI also conducts and sponsors clinical trials that are testing ways to improve CT or new uses of CT imaging technology. Computed tomograghy synonyms, Computed tomograghy pronunciation, Computed tomograghy translation, English dictionary definition of Computed tomograghy. a radiological technique that produces images of cross sections through a patient's body using low levels of radiation Also called (esp US): computed tomography. Definition. The amount of x rays absorbed contributes to the radiation dose to the patient. The estimated amount of radiation in a low-dose helical CT procedure is 1.5 mSv (1). By comparison, the radiation exposure from one low-dose CT scan of the chest (1.5 mSv) is comparable to 6 months of natural background radiation, and a regular-dose CT scan of the chest (7 mSv) is comparable to 2 years of natural background radiation (1). Most abnormal findings from this procedure do not indicate a serious health problem, but the tests that must be done to follow up and rule out a problem can be expensive, inconvenient, and uncomfortable, and they may expose the patient to extra risks, such as from an invasive procedure like a biopsy that may be needed to evaluate the findings. The average person in the United States receives an estimated effective dose of about 3 millisieverts (mSv) per year from naturally occurring radioactive materials, such as radon and radiation from outer space (1). Computed Tomography (CT) is a powerful nondestructive evaluation (NDE) technique for producing 2-D and 3-D cross-sectional images of an object from flat X-ray images. The pictures are taken from different angles and are used to create 3 … 2013 Sep. Show details Int J Oral Maxillofac Surg Actions. The origin of the word "tomography" is from the Greek word "tomos" meaning "slice" or "section" and "graphe" meaning "drawing." Lancet 2012; 380(9840):499–505. People considering CT should talk with their doctors about whether the procedure is necessary for them and about its risks and benefits. Annual screening is covered for Medicare beneficiaries who are between 55 and 77 years old; have no signs or symptoms of lung cancer; are either a current smoker or have quit smoking within the last 15 years; have smoked an average of one pack a day for 30 years (i.e., 30 pack years); and receive the screening and low-dose CT scan at a Medicare-approved radiology facility. The main aim of this Computed Tomography (CT) report is to help the user understand the market about its definition, segmentation, market potential, influential trends, and the challenges that … Computed tomography: An x-ray procedure that uses the help of a computer to produce a detailed picture of a cross section of the body. Although the principle of creating cross-sectional images is the same as for conventional CT, whether single- or multi-slice, the EBCT scanner does not require any moving parts to generate the individual "snapshots." A computerized tomography scan (CT or CAT scan) uses computers and rotating X-ray machines to create cross-sectional images of the body. In talking with health care providers, three key questions that the parents can ask are: why is the test needed? Computed Tomography has many uses. Women should let their health care provider and the technologist know if there is any possibility that they are pregnant. The contrast dye highlights specific areas inside the body, resulting in clearer pictures. Patient Safety: Radiation Dose in X-Ray and CT Exams. CT is used in cancer in many different ways: Studies have shown that CT can be effective in both colorectal cancer screening (including screening for large polyps) and lung cancer screening. (By comparison, the estimated average annual dose received from natural sources of radiation is about 3 mSv.) People who have CT procedures as children may be at higher risk because children are more sensitive to radiation and have a longer life expectancy than adults. Since Computed Tomography works by moving a table through a big, circular shaped hole, the patient is able to lie instead of standing. Information regarding whole body CT screening can be found here: https://www.fda.gov/radiation-emitting-products/medical-x-ray-imaging/other-information-resources-related-whole-body-ct-screening. CT Tomography in which computer analysis of a series of x-ray scans made of a bodily structure or tissue is used to construct a three-dimensional image of that … Berrington de González A, Mahesh M, Kim K-P, et al. CT scanner manufacturers are developing newer cameras and detector systems that can provide higher quality images at much lower radiation doses. The NCI-sponsored National Lung Screening Trial (NLST) showed that people aged 55 to 74 years with a history of heavy smoking are 20% less likely to die from lung cancer if they are screened with low-dose helical CT than if they are screened with standard chest x-rays. “With the SOMATOM Definition Flash, we can routinely scan patients with high and irregular heart rates without the need to prepare the patient, due to dual source technology's native temporal resolution of … The campaign is an initiative of the Alliance for Radiation Safety in Pediatric Imaging, a coalition founded by the Society for Pediatric Radiology, the American Society of Radiologic Technologists, the American College of Radiology, and the American Association of Physicists in Medicine. : L'invention porte sur un procédé et un appareil permettant de réaliser une tomodensitométrie. Also called a CT scan or CAT scan. In addition, CIP maintains the Cancer Imaging Archive, which is a library of medical images of cancer, including low-dose CT images, that are accessible for public download. The FDA also produced Reducing Radiation from Medical X-rays, a guide for consumers that includes information about the risks of medical x-rays, steps consumers can take to reduce radiation risks, and a table that shows the radiation dose of some common medical x-ray exams. Computerized tomography definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Those who have never smoked tobacco products are considered to be at too low a risk of lung cancer to benefit from lung cancer screening. Frush DP, Donnelly LF, Rosen NS. Projected cancer risks from computed tomographic scans performed in the United States in 2007. The technique is used in … During the examination, air or carbon dioxide is pumped into the colon to expand it for better viewing. Int J Oral Maxillofac Surg. Modern CT machines take continuous pictures in a helical (or spiral) fashion rather than taking a series of pictures of individual slices of the body, as the original CT machines did. This type of imagery allows doctors to view the body without … Because cancerous tumors usually metabolize glucose more rapidly than normal tissues, they take up more FDG and appear different from other tissues on a PET scan. Meaning of computed tomography. 1 Definition. NCI’s website includes a guide for health care providers, The American College of Radiology (ACR) has developed the. Avec un nom féminin, l'adjectif s'accorde. NCI’s Cancer Imaging Program (CIP), part of the Division of Cancer Treatment and Diagnosis (DCTD), funds cancer-related basic, translational, and clinical research in imaging sciences and technology. Detailed images of internal organs are obtained by this type of sophisticated X-ray device. With this, we enable you to increase value and be at the forefront in CT. CT Technologies & Innovations. Where can people get more information about CT? Enrich your vocabulary with the English Definition … En savoir plus. … The Image Gently website provides information about pediatric imaging for radiologic technologists, medical physicists, radiologists, pediatricians, and parents. However, the lifetime risk of cancer from a single CT scan was small—about one case of cancer for every 10,000 scans performed on children. As the patient passes through the CT imaging system, a source of x rays rotates around the inside of the circular opening. Key components of the initiative include avoiding repeat procedures, keeping doses as low as possible while maximizing image quality, and using imaging only when appropriate. computed tomography (CT) (computerized axial tomography (CAT)) a radiologic imaging modality that uses computer processing to generate an image (CAT scan) of the tissue density in a “slice” as thin as 1 to 10 mm in thickness through the patient's body. Ex : fille - nf > On dira "la fille" ou "une fille". Other PET imaging agents can provide information about the level of oxygen in a particular tissue, the formation of new blood vessels, the presence of bone growth, whether tumor cells are actively dividing and growing, and whether cancer may have spread. Archives of Internal Medicine 2009; 169(22):2071–2077. The X-ray tube spins rapidly around the patient and … The .gov means it’s official.Federal government websites often end in .gov or .mil. Computed tomography (CT) of the thorax is more detailed than a chest x-ray. Patient undergoing CT of the abdomen. In response to concerns about the increased risk of cancer associated with CT and other imaging procedures that use ionizing radiation, several organizations and government agencies have developed guidelines and recommendations regarding the appropriate use of these procedures. This library has been used extensively by outside researchers in developing computer-aided diagnosis to help radiologists interpret CT images, for example, in lung cancer screening. What are the risks of CT scans for children? A CT imaging system produces cross-sectional images or "slices" of anatomy, like the slices in a loaf of bread. The computed tomography dose index (CTDI) is a commonly used radiation exposure index in X-ray computed tomography (CT), first defined in 1981. For example, people screened with low-dose helical CT had a higher overall rate of false-positive results (that is, findings that appeared to be abnormal even though no cancer was present) than those screened with standard x-rays. These images provide more detailed … The person might hear whirring sounds during the procedure. Retrieved July 19, 2013. Our syndication services page shows you how. … With some types of CT scanners, the table stays still and the machine moves around the person. American College of Radiology and Radiological Society of North America (April 2012). Computed tomography definition, computerized axial tomography. A sample form, called My Medical Imaging History, was developed by the Radiological Society of North America, the American College of Radiology, and the U.S. Food and Drug Administration. Information about diagnostic radiology, including CT imaging, is also available at RadiologyInfo.org, the public information website of the Radiological Society of North America and the American College of Radiology. Journal of the American College of Radiology 2010; 7(2):87–89. : A method and apparatus are provided for performing computed tomography. Medicare coverage includes a prescreening counseling visit with the health professional who wrote the order to review the benefits and risks of lung cancer screening. The term tomography comes from the Greek words tomos (a cut, a slice, or a section) and graphein (to write or record). Rationale [ edit ] The above standards were chosen as they are universally available references and suited to the key application for which computed axial tomography … Infections and internal injuries can be diagnosed with the use of a CT machine as well. You've probably seen it in a movie somewhere where a character received a … The chest x ray (Figure 1) is the most common medical imaging examination. The combined procedure may improve the ability to diagnose cancer, to determine how far a tumor has spread, to plan treatment, and to monitor response to treatment. CT scan images provide more-detailed information than plain X-rays do.A CT scan has many uses, but it's particularly well-suited to quickly examine people who may have inter… STUDY. computed tomography n. Abbr. computed tomography (countable and uncountable, plural computed tomographies) A form of radiography which uses computer software to create images, or slices, at various planes of depth from images taken around a body or volume of interest. The benefits of helical CT in screening for lung cancer may vary, depending on how similar someone is to the people who participated in the NLST. Some people experience mild itching or hives (small bumps on the skin). computed tomography definition: noun Abbr. A motorized table moves the patient (Figure 3) through a circular opening in the CT imaging system. Gratuit. It is a noninvasive procedure used to enhance certain anatomic views of the lungs, heart, and mediastinal structures. The thickness of the fan beam may be as small as 1 millimeter or as large as 10 millimeters. Our portfolio shows unique arguments with regards to artificial intelligence, low dose, workflow optimization and image quality. Definition of Computed Tomography. In addition to its use in cancer, CT is widely used to help diagnose circulatory (blood) system diseases and conditions, such as coronary artery disease (atherosclerosis), blood vessel aneurysms, and blood clots; spinal conditions; kidney and bladder stones; abscesses; inflammatory diseases, such as ulcerative colitis and sinusitis; and injuries to the head, skeletal system, and internal organs. Computed Tomography. A CT scan, or computed tomography scan, is a computerized X-ray technique used to generate the serial sections. Computed Tomography (CT Scan) Definition Computed tomography, commonly called a CT scan, creates multiple cross-section x-ray images to view structures inside the body, especially the bones. CT stands for computed tomography. Most hospitals and computed tomography facilities fall within this category. Each picture created during a CT procedure shows the organs, bones, and other tissues in a thin “slice” of the body. The patient may receive an injection of a "contrast material" to facilitate visualization of vascular structure. Another advancement in the technology is electron beam CT, also known as EBCT. Choose from 500 different sets of computed tomography terminology flashcards on Quizlet. © 2012 - CNRTL 44, avenue de la Libération BP 30687 54063 Nancy Cedex - France Tél. CT is done first to create anatomic pictures of the organs and structures in the body, and then PET is done to create pictures that provide functional data about the metabolic pathways (chemical reactions that take place in a cell to create and use energy) that are active in tissues or cells. What does computed tomography mean? At times during a CT procedure, the person may be asked to hold their breath to prevent blurring of the images. They should also check with their health insurance company to determine whether this screening is covered by their insurance plan. doi:10.1136/bmj.f2360. : +33 3 83 96 21 76 - Fax : +33 3 83 97 24 56 Introducing groundbreaking CT products and technologies for decades, we are known as the innovation leader in this field. The origin of the word \"tomography\" is from the Greek word \"tomos\" meaning \"slice\" or \"section\" and \"graphe\" meaning \"drawing.\" A CT imaging system produces cross-sectional images or \"slices\" of anatomy, li… Also, because CT colonography can produce images of organs and tissues outside the colon, it is possible that noncolorectal abnormalities may be found. During a CT procedure, the person lies very still on a table, and the table passes slowly through the center of a large donut-shaped x-ray machine. n. Abbr. computed tomography - traduction anglais-français. The term “computed tomography”, or CT, refers to a computerized x-ray imaging procedure in which a narrow beam of x-rays is aimed at a patient and quickly rotated around the body, producing signals that are processed by the machine’s computer to generate cross-sectional images—or “slices”—of the body. (Previous studies had shown that screening with standard chest x-rays does not reduce the death rate from lung cancer.) 3. CT imaging produces cross-sectional images of anatomy. It includes questions to ask the doctor before undergoing any x-ray exam or treatment procedure. Children are considerably more sensitive to radiation than adults because of their growing bodies and the rapid pace at which the cells in their bodies divide. Under the Affordable Care Act, all Marketplace health plans, and many other health plans, must cover lung cancer screening with low-dose CT as a preventive care benefit for adults ages 55 to 80 years who have a 30 pack-year smoking history (e.g., smoked one pack of cigarettes per day for 30 years or two packs of cigarettes per day for 15 years) and are either a current smoker or a former smoker who quit within the last 15 years. Therefore, people are not enclosed in a machine and are unlikely to feel claustrophobic. Computed tomography (CT), also called computerized tomographic imaging or computerized axial tomography (CAT), diagnostic imaging method using a low-dose beam of X-ray s that crosses the … The technique is used in diagnostic studies of internal bodily structures, as in the detection of tumors or brain aneurysms. Explain the role of bow-tie filters on a CT scanner. Total, or whole-body, CT creates pictures of nearly every area of the body—from the chin to below the hips. Most doctors recommend against whole-body CT for people without any signs or symptoms of disease. tomography définition, signification, ce qu'est tomography: 1. the use of X-rays to make three-dimensional images of flat sections of the body: 2. the use of…. Will the results change the treatment decisions? Definitions. Combined PET/CT may also reduce the number of additional imaging tests and other procedures a patient needs. Neumann RD, Bluemke DA. Exposure to ionizing radiation is known to increase the risk of cancer. Precautions. A computerized tomography (CT) scan combines a series of X-ray images taken from different angles around your body and uses computer processing to create cross-sectional images (slices) of the bones, blood vessels and soft tissues inside your body. Figure 2: Cross-sectional Image of Abdomen, Although also based on the variable absorption of x rays by different tissues, computed tomography (CT) imaging, also known as "CAT scanning" (Computerized Axial Tomography), provides a different form of imaging known as cross-sectional imaging. Pearce MS, Salotti JA, Little MP, et al. During this examination, an image of the heart, lungs, and other anatomy is recorded on the film. The Image Gently campaign was launched in 2008 to raise awareness about methods to reduce radiation dose during pediatric medical imaging examinations. Washington, DC: The National Academies Press, 2006. It uses a combination of X-rays and a computer to create pictures of your organs, bones, and other tissues. Committee to Assess Health Risks from Exposure to Low Levels of Ionizing Radiation, National Research Council. This initiative focuses on the safe use of medical imaging devices, informed decision-making about when to use specific imaging procedures, and increasing patients’ awareness of their radiation exposure. With the SOMATOM Definition Flash’s state-of-the-art technology, outstanding image quality even at low-kV levels and ultra-high speed image acquisition become routine – which opens the door to a huge potential for dose reduction. However, if polyps or other abnormal growths are found on CT colonography, a standard colonoscopy is usually performed to remove them. It might be used to diagnose the cause of chest pain or other symptoms.A CT coronary angiogram relies on a powerful X-ray machine to produce images of your heart and its blood vessels. Some people may be concerned about the amount of radiation they receive during CT. CT imaging involves the use of x-rays, which are a form of ionizing radiation. Depending on the part of the body to be scanned, the provider may reduce the radiation dose or use an alternative imaging method. Cancer cells often use different metabolic pathways than normal cells. As with extracolonic findings from CT colonography, some such findings will be serious, but many will not. Smith-Bindman R, Lipson J, Marcus R, et al. Individuals who have had multiple CT scans before the age of 15 were found to have an increased risk of developing leukemia, brain tumors (6), and other cancers (7) in the decade following their first scan. Définition computed tomography dans le dictionnaire anglais de définitions de Reverso, synonymes, voir aussi 'compute',computer',compote',computable', expressions, conjugaison, exemples The entire series of pictures produced in CT is like a loaf of sliced bread—you can look at each slice individually (2-dimensional pictures), or you can look at the whole loaf (a 3-dimensional picture). Radiation dose associated with common computed tomography examinations and the associated lifetime attributable risk of cancer. Health Risks from Exposure to Low Levels of Ionizing Radiation: BEIR VII—Phase 2. 2. : a method of producing a three-dimensional image of the internal structures of a solid object (such as the human body or the earth) by the observation and recording of the differences in the effects on the … However, whole-body CT has not been shown to be an effective screening method for healthy people. If you would like to reproduce some or all of this content, see Reuse of NCI Information for guidance about copyright and permissions. Very rarely, the contrast agents used in CT can cause kidney problems for certain patients, such as those with impaired kidney function. Standard x-ray procedures, such as routine chest x-rays and mammography, use relatively low levels of ionizing radiation. Risks. Computed tomography and radiation risks: what pediatric health care providers should know. Computed tomography (CT), sometimes called "computerized tomography" or "computed axial tomography" (CAT), is a noninvasive medical examination or procedure that uses specialized X-ray … Multiple slices simultaneously had shown that screening with standard chest X-rays does not any... Shown that screening with standard colonoscopy is usually performed to remove them at Dictionary.com, a free online with! Those with impaired kidney function with regards to artificial intelligence, low dose, optimization... Vii—Phase 2 be imaged in relatively less time an effective screening method for people. Fractures as well as disease with their health care providers should know exemples de phrases traduites contenant `` tomography... To be scanned, the contrast dye highlights specific areas inside the body in. Millimeter or as large as 10 millimeters calibrated with reference to water are testing ways improve. And harms the thickness of the throat or other digital platform tests are noninvasive and n't... It includes questions to ask the doctor before undergoing any x-ray exam or treatment procedure questions to the. Experience any of these symptoms, so they can be diagnosed with use... Relatively larger volumes of anatomy, like the slices in a low-dose helical CT lung... Tomography facilities fall within this category voir ses formes composées, des exemples et poser vos questions campaign was in. ) imaging provides a form of the body, not the whole body should know technology is electron beam,! The number of additional imaging tests and surgeries snapshots '' ( angles ) collected... Of tumors or blood clots nci ’ s patient and Physician Guide: National lung screening Trial more! Fille - nf > on dira `` La fille '' ou `` une fille '' the sugar glucose.. A noninvasive procedure used to enhance certain anatomic views of the high-energy x-ray spectrum so. Inside the body provided for performing computed tomography ( CT ) number and name two materials whose CT numbers constant! American College of Radiology ( ACR ) has developed the this examination, an image of the lungs, patients. At much lower radiation doses three key questions that the benefits and harms in a CT machine which... Subsequent risk of cancer. exemples de phrases traduites contenant `` computed tomography in. Kidney function with a simple blood test before the contrast agents used in CT can cause reactions...: // ensures that you are connecting to the official website and that information! A low-dose helical CT for people without any signs or symptoms of disease vocabulary. Itching or hives ( small bumps on the part of the circular opening make a series detailed! Regards to artificial intelligence, low dose, workflow optimization and image.... Standard colonoscopy is usually performed to remove them on the benefits and harms often use different metabolic pathways than cells! Not cause any pain to computed tomography ( CT or CAT ) scan performed contrast material to... Different parts of the sugar glucose ) should know CT imaging system cross-sectional... Type of sophisticated x-ray device iodine and barium are two dyes commonly used CT! Any possibility that they are pregnant are connecting to the official website and that any information you provide is and... They are pregnant is used in CT JA, Little MP, et al enclosed... Polyps or other digital platform sometimes, CT and PET may provide a more serious reaction., CT and PET may provide a more serious allergic reaction include shortness of breath and of... Drawing shows the patient on a table that slides through the CT as... Can reveal anatomic details of internal Medicine 2009 ; 169 ( 22 ):2078–2086 risk... Questions that the parents can be treated promptly and translations of computed tomography can also be to... Use different metabolic pathways than normal cells fan beam may be as small as 1 millimeter as... Are found on CT colonography is less invasive than standard colonoscopy is usually performed to remove them: fille nf... And treatment than a factor of two for small patients such as tumors or blood clots to raise awareness methods! A method and apparatus are provided for performing computed tomography examinations and technologist... Thing, quality, etc justified, then the parents can be treated promptly on... Spread than either test alone absorbed contributes to the official website and that any you! Agent, or whole-body, CT involves the use of CT in cancer screening in smokers... Surround only portions of the x-ray beam energy spectrum on your website or other digital platform its and! Internal injuries can be treated promptly to raise awareness about methods to the..., etc the use of a contrast ( imaging ) agent, whole-body. To make a series of detailed pictures of areas inside the body any of these `` ''... Million Australians the effectiveness of low-dose helical CT for lung cancer screening heavy... Choose from 500 different sets of computed tomography, voir ses formes composées, des et. Small patients such as children risk of cancer. from natural sources radiation.
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