computed tomography definition

Whether CT colonography can help reduce the death rate from colorectal cancer is not yet known, and most insurance companies (and Medicare) do not currently reimburse the costs of this procedure. 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. 2. Depending on the part of the body to be scanned, the provider may reduce the radiation dose or use an alternative imaging method. X-ray computed tomography, or simply computed tomography (CT), is an imaging method using X-ray transmission and computer algorithms to reconstruct two-dimensional (2D) images of an object, representing object’s slices, or three-dimensional (3D) representations of the object’s structure, including inner geometries. A CT scan or computed tomography scan (formerly known as a computed axial tomography or CAT scan) is a medical imaging technique that uses computer-processed combinations of multiple X-ray measurements taken from different angles to produce tomographic (cross-sectional) images (virtual "slices") of a body, allowing the user to see inside the body without cutting. Lancet 2012; 380(9840):499–505. In addition, many CT systems are capable of imaging multiple slices simultaneously. Abnormal results. One hundred fifty-three patients (45 females; mean age, 67 y/o), who met the Berlin definition … Meaning of computed tomography. Also, because CT colonography can produce images of organs and tissues outside the colon, it is possible that noncolorectal abnormalities may be found. Computed Tomography. computed tomography - traduction anglais-français. 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. Radiation exposure from CT scans affects adults and children differently. En savoir plus. n. Abbr. Computed Tomography. Patient Safety: Radiation Dose in X-Ray and CT Exams. 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. computed tomography n. Abbr. You've probably seen it in a movie somewhere where a character received a … Where can people get more information about CT? Medicare covers the costs of annual lung cancer screening with low-dose CT in beneficiaries considered to be at increased risk based on their smoking history. 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. If you would like to reproduce some or all of this content, see Reuse of NCI Information for guidance about copyright and permissions. NCI also conducts and sponsors clinical trials that are testing ways to improve CT or new uses of CT imaging technology. 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. The unit of CTDI is the gray (Gy) and it can be used in conjunction with patient size to estimate the absorbed dose. The cross-sectional images (Figure 2) are used for a variety of diagnostic and therapeutic purposes. For most people, the CT is performed on an outpatient basis at a hospital or a radiology center, without an overnight hospital stay. Computed tomography, in short CT, is an X-ray method with which the human body is represented in cross-sectional images (sectional imaging technique).. In the case of permitted digital reproduction, please credit the National Cancer Institute as the source and link to the original NCI product using the original product's title; e.g., “Computed Tomography (CT) Scans and Cancer was originally published by the National Cancer Institute.”. Combining CT and PET may provide a more complete picture of a tumor’s location and growth or spread than either test alone. Berrington de González A, Mahesh M, Kim K-P, et al. 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. 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. Since Computed Tomography works by moving a table through a big, circular shaped hole, the patient is able to lie instead of standing. X-ray Imaging: Computed Tomography Zhihua Qi, PhD LEARNING OBJECTIVES 1. Computed Tomography, Renal Synonym/acronym: Computed axial tomography (CAT), computed transaxial tomography (CTT), kidney CT, helical/spiral CT. Common use To visualize and assess the kidney and surrounding structures to assist in diagnosing cancer, tumor, infection, and congenital anomalies. Computed Tomography can also be used to locate specific complications such as tumors or blood clots. Definition of Computed Tomography. 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. Women are at a somewhat higher risk than men of developing cancer after receiving the same radiation exposures at the same ages (4). A CT scan, or computed tomography scan, is a computerized X-ray technique used to generate the serial sections. Computed Tomography has many uses. The radiation exposure from CT is higher than that from standard x-ray procedures, but the increase in cancer risk from one CT scan is still small. CT imaging produces cross-sectional images of anatomy. Combined PET/CT uses two imaging methods, CT and positron emission tomography (PET), in one procedure. Computed tomography (CT) of the thorax is more detailed than a chest x-ray. Int J Oral Maxillofac Surg. Computed tomograghy synonyms, Computed tomograghy pronunciation, Computed tomograghy translation, English dictionary definition of Computed tomograghy. : 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. Such advances allow relatively larger volumes of anatomy to be imaged in relatively less time. 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. Some organizations recommend that people keep a record of the imaging examinations they have received in case their doctors don’t have access to all of their health records. Abbreviation: CT See more. Preparation. 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.. CIP supports the development of novel imaging agents for CT and other types of imaging procedures to help doctors better locate cancer cells in the body. Patients undergoing a PET/CT procedure are administered a positron-emitting (radioactive) substance, or radiopharmaceutical, that is designed to target cancer cells specifically. They should also check with their health insurance company to determine whether this screening is covered by their insurance plan. It uses a combination of X-rays and a computer to create pictures of your organs, bones, and other tissues. Our portfolio shows unique arguments with regards to artificial intelligence, low dose, workflow optimization and image quality. 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. Information and translations of computed tomography in the most comprehensive dictionary definitions resource on the web. 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 structure. CT colonography is less invasive than standard colonoscopy and has a lower risk of complications. The Image Gently campaign was launched in 2008 to raise awareness about methods to reduce radiation dose during pediatric medical imaging examinations. 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. Computed Tomography (CT) A computerized tomography (CT) scan is a detailed X-ray used to produce three-dimensional images of the body. 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. Symptoms of a more serious allergic reaction include shortness of breath and swelling of the throat or other parts of the body. However, because low-dose lung CT can produce images of organs and tissues outside the lung, it is possible that nonpulmonary abnormalities such as renal or thyroid masses may be found. 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 … 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. Patient undergoing CT of the abdomen. CT colonography uses the same dose of radiation that is used in standard CT of the abdomen and pelvis, which is about 10 millisieverts (mSv) (1). The estimated amount of radiation in a low-dose helical CT procedure is 1.5 mSv (1). Many different "snapshots" (angles) are collected during one complete rotation. Archives of Internal Medicine 2009; 169(22):2071–2077. The CTDI and absorbed dose may differ by more than a factor of two for small patients such as children. 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… Computerized tomography definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Most doctors recommend against whole-body CT for people without any signs or symptoms of disease. De très nombreux exemples de phrases traduites contenant "computed tomography scan" – Dictionnaire français-anglais et moteur de recherche de traductions françaises. 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. Normal results. X-ray computed tomography, also computed tomography (CT scan) or computed axial tomography (CAT scan), can be used for medical imaging and industrial imaging methods employing tomography created by computer … During the examination, air or carbon dioxide is pumped into the colon to expand it for better viewing. Computed tomography (CT), sometimes called "computerized tomography" or "computed axial tomography" (CAT), is a noninvasive medical examination or procedure that uses specialized X-ray … Enrich your vocabulary with the English Definition … Purpose. The technique is used in … Three-dimensional Cone Beam Computed Tomography Definition of the Anatomical Subregions of the Upper Airway: A Validation Study R Guijarro-Martínez et al. (x-ray method) tomodensitométrie, scanographie nf nom féminin: s'utilise avec les articles "la", "l'" (devant une voyelle ou un h muet), "une". Infections and internal injuries can be diagnosed with the use of a CT machine as well. Very rarely, the contrast agents used in CT can cause kidney problems for certain patients, such as those with impaired kidney function. What can a person expect during a CT procedure? Standard x-ray procedures, such as routine chest x-rays and mammography, use relatively low levels of ionizing radiation. The CT scan can reveal anatomic details of internal organs that cannot be seen in conventional X-rays.The X-ray tube spins rapidly around the patient and the X-rays strike numerous detectors after passing through the body. The amount of x rays absorbed contributes to the radiation dose to the patient. … A motorized table moves the patient (Figure 3) through a circular opening in the CT imaging system. 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). The X-ray tube spins rapidly around the patient and … 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). It is sometimes called computerized tomography or computerized axial tomography (CAT). Pearce MS, Salotti JA, Little MP, et al. Researchers funded by NCI are studying ways to improve the use of CT in cancer screening, diagnosis, and treatment. Will the results change the treatment decisions? At times during a CT procedure, the person may be asked to hold their breath to prevent blurring of the images. Neumann RD, Bluemke DA. Risks. It uses a combination of X-rays and a computer to create pictures of your organs, bones, and other tissues. Before sharing sensitive information, make sure you're on a federal government site. American College of Radiology and Radiological Society of North America (April 2012). Methods: In this study, we examined the associations between the Berlin definition criteria and prognosis and clinical parameters, including high-resolution computed tomography (HRCT) scores of fibroproliferative changes of the lungs. Mathews JD, Forsythe AV, Brady Z, et al. The pictures are taken from different angles and are used to create 3 … 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. 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. Archives of Internal Medicine 2009; 169(22):2078–2086. 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. 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. It is sometimes called computerized tomography … The computed tomography dose index (CTDI) is a commonly used radiation exposure index in X-ray computed tomography (CT), first defined in 1981. In very rare cases, the contrast agents used in CT can cause allergic reactions. Computer programs are used to create both types of pictures. Methods: In this study, we examined the associations between the Berlin definition criteria and prognosis and clinical parameters, including high-resolution computed tomography (HRCT) scores of fibroproliferative changes of the lungs. The person might hear whirring sounds during the procedure. CT was conceived by William Oldendorf and developed independently by Godfrey Newbold Hounsfield and Allan MacLeod Cormack, who shared a … Computed tomography (CT), diagnostic imaging method using a low-dose beam of X-rays that crosses the body in a single plane at many different angles. Definition. In addition, children have a longer life expectancy than adults, providing a larger window of opportunity for radiation-related cancers to develop (5). Health Risks from Exposure to Low Levels of Ionizing Radiation: BEIR VII—Phase 2. Complementary & Alternative Medicine (CAM), Coping with Your Feelings During Advanced Cancer, Emotional Support for Young People with Cancer, Young People Facing End-of-Life Care Decisions, Late Effects of Childhood Cancer Treatment, Tech Transfer & Small Business Partnerships, Frederick National Laboratory for Cancer Research, Milestones in Cancer Research and Discovery, Step 1: Application Development & Submission, Patient and Physician Guide: National Lung Screening Trial, Initiative to Reduce Unnecessary Radiation Exposure from Medical Imaging, Radiation Risks and Pediatric Computed Tomography (CT): A Guide for Health Care Providers, Division of Cancer Treatment and Diagnosis, Results of the National CT Colonography Trial: Questions and Answers, Tests to Detect Colorectal Cancer and Polyps, U.S. Department of Health and Human Services, To determine exactly where to perform (i.e., guide) a, To guide certain local treatments, such as, To determine whether a cancer is responding to treatment. 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. 2013 Sep. Show details Int J Oral Maxillofac Surg Actions. 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. 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. doi:10.1136/bmj.f2360. In typical examinations there are several phases; each made up of 10 to 50 rotations of the x-ray tube around the patient in coordination with the table moving through the circular opening. Radiation exposure from CT scans in childhood and subsequent risk of leukaemia and brain tumours: a retrospective cohort study. 4.… However, the most common PET procedure uses an imaging agent called FDG (a radioactive form of the sugar glucose). 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. Tracking radiation exposure from diagnostic imaging devices at the NIH. 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 structure. Washington, DC: The National Academies Press, 2006. What is being done to reduce the level of radiation exposure from CT? The patient may receive an injection of a "contrast material" to facilitate visualization of vascular structure. All x-ray imaging is based on the absorption of x rays as they pass through the different parts of a patient's body. The length of a CT procedure depends on the size of the area being scanned, but it usually lasts only a few minutes to half an hour. 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. 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. CT stands for computed tomography. Projected cancer risks from computed tomographic scans performed in the United States in 2007. The personnel that perform CT scans are called radiographers or radiologic technologists. If the test is clinically justified, then the parents can be reassured that the benefits will outweigh the small long-term risks. In 2009, the American College of Radiology, the Radiological Society of North America, the American Society of Radiological Technologists, and the American Association of Physicists in Medicine created the Image Wisely campaign with the objective of lowering the amount of radiation used in medically necessary imaging studies and eliminating unnecessary procedures. CT scan: Computed tomography scan. CT is a noninvasive procedure and does not cause any pain. 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. 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. 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. … 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). With some types of CT scanners, the table stays still and the machine moves around the person. computed tomography definition in English dictionary, computed tomography meaning, synonyms, see also 'compute',computer',compote',computable'. “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 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… 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 structure. 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. The dye may be given by mouth, injected into a vein, given by enema, or given in all three ways before the procedure. 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 origin of the word "tomography" is from the Greek word "tomos" meaning "slice" or "section" and "graphe" meaning "drawing." Computed tomography and radiation risks: what pediatric health care providers should know. 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. 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. (Previous studies had shown that screening with standard chest x-rays does not reduce the death rate from lung cancer.) The benefits may also be greater for those with a higher lung cancer risk, and the harms may be more pronounced for those who have more medical problems (like heart or other lung disease), which could increase problems arising from biopsies and other surgery. Combined PET/CT may also reduce the number of additional imaging tests and other procedures a patient needs. The American College of Radiology Imaging Network, which is now part of ECOG-ACRIN, performed the National CT Colonography Trial, which tested the use of CT for colorectal cancer screening, and participated in the NLST, which tested the use of CT for lung cancer screening in high-risk individuals. Tomographic reconstruction is a type of multidimensional inverse problem where the challenge is to yield an estimate of a specific system from a finite number of projections. The term tomography comes from the Greek words tomos (a cut, a slice, or a section) and graphein (to write or record). The .gov means it’s official.Federal government websites often end in .gov or .mil. Frush DP, Donnelly LF, Rosen NS. computed tomography definition: noun Abbr. Learn computed tomography terminology with free interactive flashcards. Cancer cells often use different metabolic pathways than normal cells. © 2012 - CNRTL 44, avenue de la Libération BP 30687 54063 Nancy Cedex - France Tél. During conventional x-ray imaging, the exiting x rays interact with a detection device (x-ray film or other image receptor) and provide a 2-dimensional projection image of the tissues within the patient's body - an x-ray produced "photograph" called a "radiograph." However, the level of radiation exposure in a CT scan is believed to be too low to harm a growing fetus. In comparison to the traditional … A procedure that uses a computer linked to an x-ray machine to make a series of detailed pictures of areas inside the body. 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. NCI’s website includes a guide for health care providers, The American College of Radiology (ACR) has developed the. The data are sent to a computer to reconstruct all of the individual "snapshots" into a cross-sectional image (slice) of the internal organs and tissues for each complete rotation of the source of x rays. Computed tomography definition is - radiography in which a three-dimensional image of a body structure is constructed by computer from a series of plane cross-sectional images made along an axis … Committee to Assess Health Risks from Exposure to Low Levels of Ionizing Radiation, National Research Council. These images provide more detailed … Some of these clinical trials are run by the ECOG-ACRIN Cancer Research Group, one of five groups in NCI’s National Clinical Trials Network. A computerized tomography (CT) coronary angiogram is an imaging test that looks at the arteries that supply blood to your heart. : +33 3 83 96 21 76 - Fax : +33 3 83 97 24 56 1 Definition. Definition. 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. 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. Some people are concerned about experiencing claustrophobia during a CT procedure. Ex : fille - nf > On dira "la fille" ou "une fille". Computed tomography (CT) imaging provides a form of imaging known as cross-sectional imaging. Choose from 500 different sets of computed tomography terminology flashcards on Quizlet. Computed Tomography Definitions. However, if polyps or other abnormal growths are found on CT colonography, a standard colonoscopy is usually performed to remove them. PLAY. What does computed tomography mean? 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. It is the definition for CT scanners that are calibrated with reference to water. Sometimes, CT involves the use of a contrast (imaging) agent, or dye. Series of detailed pictures of your organs, bones, and other anatomy is on... Diagnose fractures as well tomographic scans performed in the detection of tumors or brain aneurysms kidney. 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