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Most radiation therapy is planned using the results of a 3D CT scan. A 3D scan largely presents a snapshot of the body at a particular point in time, however due to the time of the acquisition, in which the patient is likely to have moved in some way (even if only breathing), there will be an element of blurring or averaging in the 3D scan. [6]
Cockade image; Codfish vertebra; Codman's triangle; Coffee bean sign; Coin lesion; Collar button ulcer; Colon cut-off sign; Comb sign; Comet sign; Comet tail sign (CT thorax) Coned epiphyses; Continuous diaphragm sign; Copula sign; Cord sign; Corduroy sign; Corkscrew oesophagus; Corkscrew sign; Cortical ring sign; Cottage loaf sign; Cotton wool ...
Ultrasound image showing the liver, gallbladder and common bile duct. Medical ultrasound uses high frequency broadband sound waves in the megahertz range that are reflected by tissue to varying degrees to produce (up to 3D) images. This is commonly associated with imaging the fetus in pregnant women. Uses of ultrasound are much broader, however.
CT scanners create these images by taking multiple radiographic planes (or cuts) of the body at different angles which records the layers of different structures in the remains. This differs from typical radiographic scans (X-rays) where all the structural layers are documented in one image, which can create shadows and therefore limit their ...
A specific type of body fat — visceral fat — around the midsection has been linked to the abnormal proteins that develop in the brain and are a hallmark of Alzheimer’s, according to findings ...
The dose should be adjusted in those not having normal body weight, and in such cases the adjustment should be proportional to the lean body mass of the person. In obese patients, the Boer formula is the method of choice (at least in those with body mass index (BMI) between 35 and 40): [12] For men: Lean body mass = (0.407 × W) + (0.267 × H ...
The first computed tomography (CT) system capable of producing images of any part of the human body without the need for a cumbersome "water tank" was the Automatic Computerized Transverse Axial (ACTA) scanner, designed by Dr. Robert S. Ledley, DDS, at Georgetown University. This revolutionary machine was equipped with 30 photomultiplier tubes ...
A notable example of applications is the reconstruction of computed tomography (CT) where cross-sectional images of patients are obtained in non-invasive manner. Recent developments have seen the Radon transform and its inverse used for tasks related to realistic object insertion required for testing and evaluating computed tomography use in ...