Articles

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16,851 results found
Article

Segond fracture

Segond fracture is an avulsion fracture of the knee that involves the lateral aspect of the tibial plateau and is very frequently (~75% of cases) associated with disruption of the anterior cruciate ligament (ACL). On the frontal knee radiograph, it may be referred to as the lateral capsular sign...
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Dual energy CT

Dual energy CT, also known as spectral CT, is a computed tomography technique that uses two separate x-ray photon energy spectra, allowing the interrogation of materials that have different attenuation properties at different energies. Technique Whereas conventional single-energy CT produces a...
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T1 mapping - myocardium

T1 mapping is a magnetic resonance imaging technique used to calculate the T1 time of a certain tissue and display them voxel-vice on a parametric map. It has been used for myocardial tissue characterization 1-6 and has been investigated for other tissues 5. Terminology Native T1 is referred t...
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T2 mapping - myocardium

T2 mapping is a magnetic resonance imaging technique used to calculate the T2 times of a certain tissue and display them voxel-vice on a parametric map. It has been used for tissue characterization of the myocardium 1-5 and has been investigated for cartilage 6,7 and other tissues 4. T2 mapping...
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T2* mapping - myocardium

T2* mapping is a magnetic resonance imaging technique used to calculate the T2* time of tissue and display them voxel-vice on a parametric map. It is used for myocardial tissue characterization 1-4 and has been investigated for other tissues 5,6. Clinical applications T2* relaxation time has b...
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Myositis ossificans

Myositis ossificans is the most common form of heterotopic ossification, usually within large muscles. Its importance stems in large part from its ability to mimic more aggressive pathological processes. Myositis ossificans is one of the skeletal “don’t touch” lesions. Some conditions are relat...
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Guillain-Barré syndrome

Guillain-Barré syndrome (GBS) is a heterogeneous group of autoimmune polyradiculopathies, involving sensory, motor, and autonomic nerves. It is the most common cause of rapidly progressive flaccid paralysis. It is believed to be one of a number of related conditions, sharing a similar underlying...
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Optic nerve

The optic nerve is the second (CN II) cranial nerve (TA: nervus opticus or nervus cranialis II). It is a purely sensory nerve that conveys visual information from the eye to the brain.  The nerve arises from the back of the globe exiting the orbit via the optic canal. It joins the contralateral...
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Post-acute COVID-19 vaccination syndrome

Post-acute COVID-19 vaccination syndrome (PACVS) 1 was recently described in a fifty-year-old woman vaccinated (after the second BNT162b2 dose). Specifically, the patient was diagnosed with chronic myopericarditis, a coagulopathy, Guillain-Barré syndrome (GBS) and a series of other anomalies (oc...
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Huntington disease

Huntington disease (HD), also known as Huntington chorea, is an autosomal dominant trinucleotide repeat neurodegenerative disease characterized by a loss of GABAergic neurons of the basal ganglia, especially atrophy of the caudate nucleus and putamen (dorsal striatum). Huntington disease is clin...
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Acute hepatitis

Acute hepatitis (plural: acute hepatitides) occurs when the liver suffers an injury with a resulting inflammatory reaction. The cause of the injury can happen in multiple different ways, and imaging findings are often non-specific. Acute hepatitis is a clinical diagnosis and a normal imaging app...
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Optimal exposure in digital radiography

General radiography has a direct relationship between optimal exposure and a diagnostic image. Dynamic range Traditionally, general radiography utilized film technology with a limited dynamic range, in which under or overexposed films either develop ‘too dark’ or ‘too light' 1. Put simply; dyn...
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Small bowel follow-through

Small bowel follow-through is a fluoroscopic technique designed to obtain high-resolution images of the small bowel. The motility of the small bowel can also be grossly evaluated. Indications The small bowel follow-through can be useful for the evaluation of: strictures obstruction divertic...
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Shoulder (lateral scapula view)

The lateral scapula shoulder or Y view is part of the standard shoulder series. Indications Orthogonal to the AP shoulder (note: as is an axillary view); this view is a pertinent projection to assess suspected dislocations, scapula fractures, and degenerative changes. It is also useful in seei...
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Iterative reconstruction (CT)

Iterative reconstruction refers to an image reconstruction algorithm used in CT that begins with an image assumption and compares it to real-time measured values while making constant adjustments until the two are in agreement. Computer technology limited early scanners in their ability to perf...
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Cardiac strain imaging

Strain imaging is a cardiac imaging technique that detects ventricular deformation patterns and functional abnormalities before they become obvious as regional wall motion abnormalities on conventional cine imaging or echo. It has become more popular lately due to several technological improveme...
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Virtual grid

Virtual grid software is a relatively new innovation utilizing no physical grid at all. Instead, the original purpose of a grid is replicated by an algorithm 1 based on fundamental mathematics (i.e. Laplace transformation, wavelet transformation and Gaussian decomposition) which iteratively reco...
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Aicardi-Goutières syndrome

Aicardi-Goutières syndrome is a rare hereditary neurodegenerative disease which usually presents in early infancy as a systemic and central nervous system inflammatory syndrome characterized by hepatosplenomegaly, vasculopathy and encephalopathy. Many of the features are similar to congenital TO...
Article

LI-RADS US Surveillance

Liver Imaging Reporting and Data System Ultrasound Surveillance (LI-RADS US Surveillance) is standardized system with recommendations for imaging technique, interpretation and reporting for surveillance of HCC using unenhanced ultrasound in patients at high risk for developing HCC. As a surveill...
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CT colonography reporting and data system

CT Colonography Reporting and Data System (C-RADS) is a method devised to standardize CT colonography (CTC) reporting. The current revision is Version 20235. Terminology A polyp is defined as a homogenous soft tissue attenuation lesion, projecting into the colonic lumen with a fixed point of a...

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