Items tagged “refs”
2,968 results found
Article
Single linear regression
Single linear regression, also known as simple linear regression, in statistics, is a technique that maps a relationship between one independent and one dependent variable into a first-degree polynomial. Linear regression is the simplest example of curve fitting, a type of mathematical problem i...
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Quantitative computed tomography (overview)
Quantitative computed tomography (QCT) can refer to
quantitative computed tomography - bone (in BMD assessment)
quantitative computed tomography - thoracic imaging
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Limbus labrum
A limbus labrum is as an enlarged and deformed acetabular labrum, which covers the lateral margin of a subluxed femoral head.
Epidemiology
Seen in children and young adults.
Clinical presentation
hip pain and labral tears
seen mainly in settings of developmental dysplasia of the hip (DDH) o...
Article
Self‐limiting sternal tumors of childhood
Self‐limiting sternal tumors of childhood (SELSTOC) are rare, self-limiting, dumbbell-shaped chest wall tumor found in young children.
Epidemiology
Median age is 16 months (range 7-50 months).
Pathology
The pathology is not clearly defined, but often shows aspecific inflammation.
Radiograp...
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Pedunculated hepatic hemangioma
Pedunculated hepatic hemangiomas are a type of hepatic hemangioma and are rare benign tumors of the liver. They can create a diagnostic challenge when they are connected only by a thin stalk and can be mistaken for a malignant mass.
Clinical presentation
They can be asymptomatic or complicate...
Article
Redating pregnancy (ultrasound)
Redating a pregnancy may occur when there is a discrepancy between the estimated due date (EDD) calculated by the last menstrual period (LMP) and that by ultrasound. Care should be taken when redating a pregnancy, especially in the third trimester, as there may be other reasons for a fetus to be...
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Time to peak (TTP)
Time-to-peak (TTP) is the time at which contrast concentration reaches its maximum. For example, for a particular dynamic susceptibility contrast (DSC) imaging acquisition in which images are acquired every 1.5 seconds, possible TTP values could include 20.0 seconds, 21.5 seconds, 23.0 seconds, ...
Article
Lenticonus
Lenticonus is a rare congenital abnormality characterized by conical bulging of the posterior or anterior lens surface. If the bulging is global rather than conical, the condition is referred to as lentiglobus 1.
Clinical presentation
It produces a decrease in visual acuity and irregular refra...
Article
Suprascapular vein
The suprascapular vein drains the posterior structures of the scapula including the supraspinatus and infraspinatus muscles.
Gross anatomy
Course
Running adjacent to the suprascapular nerve and artery it passes through the suprascapular notch in a number of configurations:
above the transver...
Article
Hair artifact
Hair artifact and hair-product artifacts are artifacts produced by the presence of the patient's hair, hair accessories (e.g. hair clip) and hair products (e.g. shampoo) within the field of view during acquisition of an image, which can affect all modalities to varying degrees. For example, in m...
Article
American Dental Association Universal Numbering System
The American Dental Association Universal Numbering System is a tooth notation system primarily used in the United States.
Teeth are numbered from the viewpoint of the dental practitioner looking into the open mouth, clockwise starting from the distalmost right maxillary teeth.
Permanent teeth...
Article
Uterine venous plexus
The uterine venous plexus is a network of veins surrounding the uterus and has extensive anastomoses with the vaginal venous plexus inferiorly and ovarian venous plexuses laterally.
Gross anatomy
The uterine venous plexus lies along the lateral aspects and superior angles of the uterus within ...
Article
Primary pulmonary hemosiderosis
Primary pulmonary hemosiderosis is one group of pulmonary hemosiderosis and can comprise of
pulmonary hemosiderosis associated Goodpasture syndrome
pulmonary hemosiderosis associated with hypersensitivity to proteins in cow's milk (Heiner syndrome)
idiopathic pulmonary hemosiderosis (IPH)
Article
Intra-articular gas
Intra-articular gas or air (pneumarthrosis) can occur from a number of varied pathologies and should be interpreted according to the clinical context.
Causes include
trauma
compound injury with gas entering from the outer surface
can occur with a pneumolipohaemarthrosis
surg...
Article
Abusive head trauma
Abusive head trauma is a term that is used for inflicted head injury that has occurred by either shaking, impact head trauma, or both, as part of the spectrum of non-accidental injury (NAI).
Pathology
Intracranial injuries
Subdural hemorrhage in a child should be viewed with suspicion. Most o...
Article
Skull fracture (NAI)
Skull fractures in non-accidental injury are the result of abusive impact head trauma. However, not all skull fractures in children are the result of abuse. Accidental head injury may result in a skull fracture and it is important for the radiologist to understand what features make a non-accide...
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Rib fractures (NAI)
Rib fractures in non-accidental injury are a relatively common mode of presentation in inflicted non-accidental injury.
In the context of a child with normal bones, rib fractures are always concerning for non-accidental injury 1 and appropriate clinical assessment should be made. This will usua...
Article
SRU guidelines for assessment of thyroid nodules
The Society of Radiologists in Ultrasound (SRU) guidelines for the assessment of thyroid nodules were defined in a consensus conference statement published in 2005 focused on which thyroid nodules detected on ultrasonography should undergo fine needle aspiration.
Recommendations
The recommenda...
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Right ventricular false tendons
Right ventricular false tendons (RFTs), also known as right ventricular muscular bands, are a much less well-known entity than left ventricular false tendons (LFTs). They are fibromuscular structures that arise from the inner trabeculated myocardial layer of the right ventricle, with a range of ...
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Biotin deficiency
Biotin deficiency is very rare. Biotin is a vitamin which acts as an enzymatic cofactor with a key role in energy production and the synthesis of fats. Biotin is present in a diverse range of cereals, nuts, seeds and eggs. Hence, true deficiency is unusual. It has been observed in the following ...
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