IN THE NAME OF GOD. Imaging Diagnosis Of Parasitic Helminthes 1 An introduction to imaging techniques . By Sh.Ghaffary January 2008 . Outlines. An introduction to imaging techniques Normal and abnormal images Major Multi-System Diseases Schistosomiasis
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Predominantly Small Bowel
Predominantly Colon Diseases
Air Fat Water/ST Bone Metal/+Contrast
BLACKGRAY- GRAY GRAY -WHITE
CT also relies on x-rays transmitted through the body.
differs from conventional radiography in that :
very small differences in x-ray absorption values can be visualized and range of densities recorded is increased approximately 10-fold.
Not only can fat be distinguished from other soft tissues, but gradations of density within soft tissues can also be recognized, e.g. brain substance from cerebrospinal fluid, or tumor from surrounding normal tissues.
Ultrasound scan of longitudinal section through the liver and right kidney. A cyst (C) is present in the upper pole of the kidney.
Ultrasound scan of gail bladder showing a large stone in the neck of the gall bladder (white arrow). Note the acoustrc shadow behind the stone (horizontal arrows).
The basic principles of MRI:
Advantages of MRI over CT :
Disadvantages of MRI:
(a) Extrapleural mass. The mass has a smooth convex border with a wide base on the chest wall(myeloma lesion arising in a rib). (b) located pulmonary mass such as a primary carcinoma of the lung.
The silhouette sign :
The silhouette sign
Any abnormal intrapulmonary shadow is placed into one or more of the following broad categories:
The presence of cavitation or calcification should be noted.
The signs of air-space filling are:
ill-defined pulmonary shadowing in both mid-zones
Pneumococcal pneumonia - massive opacity left lung with air bronchogram.
Alveolar pulmonary oedema. Typical bat’s wing pattern.
Pulmonary collapse (atelectasis):
Spherical shadows (lung mass, lung nodule):
The usual causes of a solitary pulmonary nodule are:
Normal abdominal plain film
Barium enema (double-contrast)
Radiologic manifestations of Malabsorption:
The signs that may occur with any of the causes of malabsorption are:
Normal Intravenous pyelogram
An injection of x-ray contrast media is given to a patient via a needle or cannula into the vein. The contrast is excreted or removed from the bloodstream via the kidneys, and the contrast media becomes visible on x-rays almost immediately after injection.