Items tagged “ultrasound”

398 results found
Article

Long head of biceps tendinopathy

Biceps tendon can be examined both with MRI of the shoulder or Ultrasound of the shoulder. Ultrasound findings The findings on ultrasound indicating tendinopathy are the same as with other tendons: fluid in the tendon sheath (note: it communicates with the shoulder joint and is therefore no...
Article

Ultrasound of the hip (adult)

There are several approaches to ultrasound examination of the adult hip.  Anterior approach Patient positioning supine with the hip in mild external rotation Planes sagittal oblique plane parallel to the long axis of the femoral neck to assess femoral head and neck and for any joint effusio...
Article

Ultrasound appearances of liver metastases

Ultrasound appearance of liver metastases can have bewildering variation. Patterns do exist between ultrasound appearance of the liver metastases and the likely primary, which is sometimes helpful in directing a search for an unknown primary, as well as helping distinguish between benign lesion...
Article

Pseudodysraphism

A pseudodysraphism refers to the splayed  appearance of a normal spine created due to excessive craniocaudal angulation during sonographic evaluation. This can erroneously lead to the diagnosis of a spinal neural tube defect.
Case

Subacromial subdeltoid bursa injection - ultrasound guided

Subacromial subde...
 Diagnosis certain
A.Prof Frank Gaillard
Published 08 Nov 2009
63% complete
Ultrasound
Article

Physical principles of ultrasound

Medical ultrasound is based on the use of high-frequency sound to aid in the diagnosis and treatment of patients. Ultrasound frequencies range from 2 to approximately 15 MHz, although even higher frequencies may be used in some situations. The ultrasound beam originates from mechanical oscillat...
Article

Ultrasound frequencies

Ultrasound frequencies in diagnostic radiology range from 2 MHz to approximately 15 MHz.  It is important to remember that higher frequencies of ultrasound have shorter wavelengths and are absorbed/attenuated more easily. Therefore, higher frequencies are not as penetrating. This explains why h...
Article

Piezoelectric effect

Piezoelectric effect refers to applying an electric field to a crystal, which causes realignment of the internal dipole structure resulting in the crystal to lengthen or contract. The process converts electrical energy into kinetic or mechanical energy. The reverse of the piezoelectric effect c...
Article

Historical aspects of ultrasound in medicine

The first written document dealing with the use of waves in spatial orientation dates back to 1794, when Lazaro Spallanzani (“Opus coli di fisica”), analyzed the basic mechanisms of spatial orientation of the bats, proposing other mechanisms of spatial orientation than the visual – ophthalmic sy...
Article

Ultrasound evaluation of breast cysts

Ultrasound evaluation of breast cysts is the modality of choice. Obstruction of the ducts, often appearing as the result of epithelial hyperplastic processes or the stromal fibrosis, or both processes lead to the formation of cysts, disabling the drainage of the terminal ducts of the lobules. I...
Article

Reactive vs malignant lymph nodes (ultrasound features)

A number of sonographic features are helpful in distinguishing reactive versus malignant lymph nodes. Grey scale features Features that favour reactive/infective nodes over malignancy include: nodal matting surrounding soft tissue oedema Doppler features Doppler examination is particularly...
Article

Ultrasound assessment of carotid arterial atherosclerotic disease

Ultrasound assessment of carotid arterial atherosclerotic disease has become the first choice for carotid artery stenosis screening, permitting the evaluation of both the macroscopic appearance of plaques as well as flow characteristics in the carotid artery. This article focus on internal caro...
Article

Hepatic arterial resistive index

The resistive index (RI) is the commonest Doppler parameter used for hepatic arterial evaluation. The usual range in normal, as well as post-transplant individuals, is between 0.55 and 0.8. It is measured by: RI = (peak systolic velocity - end diastolic velocity)/peak systolic velocity Hepati...
Article

Colour comet-tail artifact

The colour comet-tail artifact is an ultrasonographic sign seen in a number of situations when colour Doppler scanning is performed. Typically the artifact, which resembles the grey-scale comet-tail artifact, is seen in a situation when a small highly refractive (usually calcific) object is int...
Article

Comet-tail artefact

The comet-tail artefact is a grey-scale ultrasound finding seen when small calcific / crystalline / highly reflective objects are interrogated and is believed to be a special form of reverberation artifact. It is similar to the colour comet-tail artefact and is seen in similar situations, altho...
Case

Failed early pregnancy

Gestational sac >...
 Diagnosis certain
Dr Bruno Di Muzio
Published 05 Aug 2010
88% complete
Ultrasound
Article

Generalised reduced hepatic echogenicity

Causes of generalised reduction of liver echogenicity on ultrasound include: acute hepatitis diffuse malignant infiltration See also generalised increase in liver echogenicity hepatic attenuation on CT
Article

Generalised increase in hepatic echogenicity

Causes of generalised increased liver echogenicity include: diffuse fatty infiltration cirrhosis: can be coarsened as well chronic hepatitis 3: can be coarsened as well diffuse infiltration or deposition malignant process granulomata  tuberculosis brucellosis sarcoidosis glycogen stora...
Article

Keyhole sign (posterior urethral valves)

The keyhole sign is an ultrasonographic sign seen in boys with posterior urethral valves. It refers to the appearance of the proximal urethra (which is dilated) and associated thick walled distended bladder which on ultrasound may resemble a key hole.
Case

Acute appendicitis - paediatric

Appendix transver...
 Diagnosis probable
Brendan Cullinane
Published 15 Jan 2011
54% complete
Ultrasound

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