Tomography

A computerized tomography (CT) or computerized axial tomography (CAT) scan combines data from several X-rays to produce a detailed image of structures inside the body. CT scans produce 2-dimensional images of a “slice” or section of the body, but the data can also be used CT scans are used in hospitals worldwide. Share on Pinterest A CT scan can help diagnose many types of cancer. A CT scanner emits a series of narrow beams through the human body as it moves through an arc. This is different from an X-ray machine, which sends just one radiation beam. The CT scan produces a more detailed final picture than an X-ray image. The CT scanner’s X-ray detector can see hundreds of different levels of density. It can see tissues within a solid organ. This data is transmitted to a computer, which builds up a 3-D cross-sectional picture of the part of the body and displays it on the screen. Sometimes, a contrast dye is used because it can help show certain structures more clearly. For instance, if a 3-D image of the abdomen is required, the patient may have to drink a barium meal. The barium appears white on the scan as it travels through the digestive system. If images lower down the body are required, such as the rectum, the patient may be given a barium enema. If blood vessel images are the target, a contrast agent will be injected into the veins. The accuracy and speed of CT scans may be improved with the application of spiral CT, a relatively new technology. The beam takes a spir...

Computed tomography (CT) colonography or virtual colonoscopy uses special x-ray equipment to examine the large intestine for cancer and growths called polyps. During the exam, the doctor inserts a small tube a short distance into the rectum. The doctor uses gas or air to inflate the colon and the rectum and takes pictures. Prior to your exam, your doctor may restrict you to clear fluids on the day before the CT and give you instructions on clearing your bowels. Tell your doctor if there's a possibility you are pregnant and discuss any recent illnesses, medical conditions, medications you're taking, and allergies. Your doctor will tell you not to eat or drink anything for a few hours beforehand. If you have a known allergy to contrast material, your doctor may prescribe medications to reduce the risk of an allergic reaction. You must take these medications 12 hours prior to your exam. Leave jewelry at home and wear loose, comfortable clothing. You will need to wear a gown. What is CT Colonography? Computed tomography, more commonly known as a CT or CAT scan, is a diagnostic medical imaging test. Like traditional x-rays, it produces multiple images or pictures of the inside of the body. A CT scan generates images that can be reformatted in multiple planes. It can even generate three-dimensional images. Your doctor can review these images on a computer monitor, print them on film or via a 3D printer, or transfer them to a CD or DVD. CT images of internal organs, bones, soft t...

• العربية • Беларуская (тарашкевіца) • Български • Català • Čeština • Dansk • Deutsch • Eesti • Español • Esperanto • Euskara • فارسی • Français • Gaeilge • Galego • Հայերեն • हिन्दी • Bahasa Indonesia • Italiano • עברית • ქართული • Kurdî • Кыргызча • Lietuvių • Македонски • മലയാളം • Nederlands • 日本語 • Oʻzbekcha / ўзбекча • Polski • Português • Русский • සිංහල • Svenska • தமிழ் • Türkçe • Українська • Tiếng Việt • 中文 Tomography is tomography is derived from tomos, "slice, section" and γράφω graphō, "to write" or, in this context as well, "to describe." A device used in tomography is called a tomograph, while the image produced is a tomogram. In many cases, the production of these images is based on the mathematical procedure Although Types of tomography [ ] Name Source of data Abbreviation Year of introduction AT 2020 Array tomography AT 2007 APT CTIS 2001 Computed tomography of chemiluminescence CTC 2009 Confocal microscopy ( LSCM CryoET ECT 1988 ECVT ERT EIT 1984 ET 1968 1930s fMRI 1992 TGS or ECT TCT HT 2000 Infrared microtomographic imaging 2013 LAT 2013 MIT MPI 2005 MRI or MRT OAT OCT ODT OPT PAT POT 2009 PET PET-CT QST SPECT THz-CT TAT UOT USCT CT, CATScan 1971 microCT Some recent advances rely on using simultaneously integrated physical phenomena, e.g. X-rays for both [ citation needed] that deal with the reconstruction of objects that are discrete (such as crystals) or homogeneous. They are concerned with reconstruction methods, and as such they are not restricted ...

For certain medical conditions, imagery from an X-ray or ultrasound test isn’t enough. A computed tomography (CT) scan provides a more detailed view of your tissues, blood vessels, and bones. Doctors and other healthcare professionals have years of training in their field, but there are still many things they can’t diagnose simply by looking at or listening to your body. That’s where tests like a CT are helpful. In this article, we look closely at how a CT scan works, what it’s typically used for, and what the procedure is like. A CT scan uses computers and rotating A CT scan may be used to visualize the: • head • shoulders • spine • heart • abdomen • knee • chest During a CT scan, you lie in a tunnel-like machine while the inside of the machine rotates and takes a series of X-rays from different angles. These pictures are then sent to a computer, where they’re combined to create images of slices, or cross-sections, of the body. They may also be combined to produce a 3-D image of a particular area of the body. CT scans can provide detailed images of bones, tissues, and even blood vessels inside your body. However, the images that are produced by these scans appear in shades of blacks and grays. It can be difficult at times even for a trained eye to differentiate one tissue type from another in certain situations. However, there are a few risks associated with using contrast dyes. For example, there’s a higher chance of Still, every CT scan exposes you to a certain level of...

Dental Cone Beam CT Dental cone beam computed tomography (CT) is a special type of x-ray equipment used when regular dental or facial x-rays are not sufficient. Your doctor may use this technology to produce three dimensional (3-D) images of your teeth, soft tissues, nerve pathways and bone in a single scan. This procedure requires little to no special preparation. Tell your doctor if there's a possibility you are pregnant. Wear loose, comfortable clothing and leave jewelry at home. You may be asked to wear a gown. What is Dental Cone Beam CT? Dental cone beam See the Cone beam CT is not the same as conventional CT. However, dental cone beam CT can be used to produce images that are similar to those produced by conventional CT imaging. With cone beam CT, an x-ray beam in the shape of a cone is moved around the patient to produce a large number of images, also called views. CT scans and cone beam CT both produce high-quality images. Dental cone beam CT was developed as a means of producing similar types of images but with a much smaller and less expensive machine that could be placed in an outpatient office. Cone beam CT provides detailed images of the bone and is performed to evaluate diseases of the jaw, dentition, bony structures of the face, nasal cavity and sinuses. It does not provide the full diagnostic information available with conventional CT, particularly in evaluation of soft tissue structures such as muscles, lymph nodes, glands and nerves. However, cone beam C...

• العربية • অসমীয়া • Azərbaycanca • বাংলা • Беларуская • Български • བོད་ཡིག • Bosanski • Brezhoneg • Català • Čeština • Cymraeg • Dansk • الدارجة • Deutsch • Eesti • Ελληνικά • Español • Esperanto • Euskara • فارسی • Français • Gaeilge • Galego • 客家語/Hak-kâ-ngî • 한국어 • Հայերեն • हिन्दी • Hrvatski • Bahasa Indonesia • Íslenska • Italiano • עברית • ಕನ್ನಡ • कॉशुर / کٲشُر • Қазақша • Kurdî • Latina • Latviešu • Lietuvių • Magyar • മലയാളം • Bahasa Melayu • Nederlands • 日本語 • Norsk bokmål • Norsk nynorsk • Oʻzbekcha / ўзбекча • پښتو • Polski • Português • Ripoarisch • Русский • සිංහල • Simple English • سنڌي • Slovenčina • Slovenščina • کوردی • Српски / srpski • Srpskohrvatski / српскохрватски • Suomi • Svenska • தமிழ் • Татарча / tatarça • ไทย • Türkçe • Українська • Tiếng Việt • Winaray • 吴语 • 粵語 • 中文 Types [ ] On the basis of image acquisition and procedures various type of scanners are available in the market. Sequential CT [ ] Sequential CT also known as step-and-shoot CT is a type of scanning method in which the CT table moves stepwise. The table increments to a particular location and then stops which is followed by the Spiral CT [ ] Main article: Dual Energy CT [ ] Dual Energy CT also known as Spectral CT is an advancement of Computed Tomography in which two energies are used to create two sets of data. • Dual source CT is an advanced scanner with a two X-ray tube detector system, unlike conventional single tube systems. • Single Source with Energy switching is another ...