WebTomography is imaging by sections or sectioning that uses any kind of penetrating wave.The method is used in radiology, archaeology, biology, atmospheric science, geophysics, oceanography, plasma physics, materials science, astrophysics, quantum information, and other areas of science.The word tomography is derived from Ancient …

WebPositron emission tomography (PET) is a functional imaging technique that uses radioactive substances known as radiotracers to visualize and measure changes in metabolic processes, and in other physiological activities including blood flow, regional chemical composition, and absorption.Different tracers are used for various imaging …

WebHigh-resolution computed tomography (HRCT) is a type of computed tomography (CT) with specific techniques to enhance image resolution.It is used in the diagnosis of various health problems, though most commonly for lung disease, by assessing the lung parenchyma. On the other hand, HRCT of the temporal bone is used to diagnose various …

WebThe computed tomography dose index (CTDI) is a commonly used radiation exposure index in X-ray computed tomography (CT), first defined in 1981. The unit of CTDI is the gray (Gy) and it can be used in conjunction with patient size to estimate the absorbed dose.The CTDI and absorbed dose may differ by more than a factor of two for small …

WebComputed tomography is an imaging procedure that uses special x-ray equipment to create detailed pictures, or scans, of areas inside the body. It is sometimes called computerized tomography or computerized axial tomography (CAT).. The term tomography comes from the Greek words tomos (a cut, a slice, or a section) and …

WebComputed tomography of the head uses a series of X-rays in a CT scan of the head taken from many different directions; the resulting data is transformed into a series of cross sections of the brain using a computer program. CT images of the head are used to investigate and diagnose brain injuries and other neurological conditions, as well as other …

WebTomografia computadorizada (português brasileiro) ou tomografia computorizada (português europeu) (TC), originalmente apelidada tomografia axial computadorizada / computorizada (TAC) - em inglês: X-ray computed tomography - é um exame complementar de diagnóstico por imagem, que consiste numa imagem que representa …

WebWhen pitch is greater than 1, the radiation dose for a given axial field of view (FOV) is decreased compared to conventional CT. At high pitches there is, however, a trade-off in terms of noise and longitudinal resolution. ... Helical (or spiral) cone beam computed tomography is a type of three-dimensional computed tomography (CT) ...

WebComputed tomography of the abdomen and pelvis is an application of computed tomography (CT) and is a sensitive method for diagnosis of abdominal diseases. It is used frequently to determine stage of cancer and to follow progress. It is also a useful test to investigate acute abdominal pain (especially of the lower quadrants, whereas ultrasound …

WebA computed tomography scan (usually abbreviated to CT scan; formerly called computed axial tomography scan or CAT scan) is a medical imaging technique used to obtain detailed internal images of the body. The personnel that perform CT scans are called radiographers or radiology technologists.. CT scanners use a rotating X-ray tube and a …