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Positron emission tomography–computed tomography (better known as PET-CT or PET/CT) is a nuclear medicine technique which combines, in a single gantry, a positron emission tomography (PET) scanner and an x-ray computed tomography (CT) scanner, to acquire sequential images from both devices in the same session, which are combined into a single superposed (co-registered) image. Thus, functional imaging obtained by PET, which depicts the spatial distribution of metabolic or biochemical activity in the body can be more precisely aligned or correlated with anatomic imaging obtained by CT scanning. Two- and three-dimensional image reconstruction may be rendered as a function of a common software and control system....

A 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 row of detectors placed in a gantry to measure X-ray attenuations by different tissues inside the body. The multiple X-ray measurements taken from different angles are then processed on a computer using tomographic reconstruction algorithms to produce tomographic (cross-sectional) images (virtual \"slices\") of a body. CT scan can be used in patients with metallic implants or pacemakers, for whom magnetic resonance imaging (MRI) is contraindicated.

Since its development in the 1970s, CT scanning has proven to be a versatile imaging technique. While CT is most prominently used in medical diagnosis, it can also be used to form images of non-living objects. The 1979 Nobel Prize in Physiology or Medicine was awarded jointly to South African-American physicist Allan MacLeod Cormack and British electrical engineer Godfrey Hounsfield \"for the development of computer-assisted tomography\"...

A CT pulmonary angiogram (CTPA) is a medical diagnostic test that employs computed tomography (CT) angiography to obtain an image of the pulmonary arteries. Its main use is to diagnose pulmonary embolism (PE). It is a preferred choice of imaging in the diagnosis of PE due to its minimally invasive nature for the patient, whose only requirement for the scan is an intravenous line.

Modern MDCT (multi-detector CT) scanners are able to deliver images of sufficient resolution within a short time period, such that CTPA has now supplanted previous methods of testing, such as direct pulmonary angiography, as the gold standard for diagnosis of pulmonary embolism....

In human anatomy, the left and right posterior communicating arteries are small: 471  arteries at the base of the brain that form part of the circle of Willis.

Anteriorly, it unites with the internal carotid artery (ICA) (prior to the terminal bifurcation of the ICA into the anterior cerebral artery and middle cerebral artery); posteriorly, it unites with the posterior cerebral artery.

With the anterior communicating artery, the posterior communicating arteries establish a system of collateral circulation in cerebral circulation....

The middle cerebral artery (MCA) is one of the three major paired cerebral arteries that supply blood to the cerebrum. The MCA arises from the internal carotid artery and continues into the lateral sulcus where it then branches and projects to many parts of the lateral cerebral cortex. It also supplies blood to the anterior temporal lobes and the insular cortices.

The left and right MCAs rise from trifurcations of the internal carotid arteries and thus are connected to the anterior cerebral arteries and the posterior communicating arteries, which connect to the posterior cerebral arteries. The MCAs are not considered a part of the Circle of Willis....

Nursing butterfly (LPN) is a term known in the United States for a person who, with a doctor's or nursing license, provides nursing services to care for sick and injured people who are recovering or failing.

in Iran, a nursing license is given to a person who has completed a nursing training course (associate, bachelor, master and doctorate) in accordance with the rules of the Higher Education Planning Council in one of the approved faculties of the council for the expansion of accredited foreign universities or faculties and whose degree has been approved by the General Directorate of graduates of the Ministry of health, treatment and medical education.
people with nursing licenses are able to do specialized work in homes, nursing homes and extensive care centers.
to obtain this government license, people must successfully complete the required score during an examination period....

Confrontational disobedience disorder (ODD) is defined in the fifth edition of the Diagnostic and statistical guide to Mental Disorders (DSM-5) as a neurological/irritable mood pattern, contentious/confrontational behavior, or retaliatory behavior that lasts for at least six months. Unlike children with conduct disorder (CD), children with coping disobedience disorder are not aggressive towards people or animals, do not destroy property, and do not show a pattern of theft or deception. Opposition defiant disorder is a type of behavioral disorder, commonly observed in children. Usually, children with this disorder have behaviors associated with violence, disobedience, stubbornness and anger, as opposed to those in a position of power.these children are very sensitive to the reaction of others and resist their orders and requests. These children, in the company of family, friends, classmates and even at an older age in the workplace, also create many problems for themselves with this behavior....

Assistant physician...