One of the most important aspects of an accurate colon examination is patient preparation. This requires a thorough knowledge of the types and actions of cathartics as well as their potential hazards. In addition, other adjunctive measures can be applied to ensure good hospital staff and patient cooperation. A guide for the radiologist is presented.
In a crossover study of more than 300 double contrast colon examinations, including 2,200 radiographs, many common and some uncommon views were taken and compared. An optimal series of "routine" films and the order in which they should be taken are presented. This will produce a complete colon examination in the most efficient way. Some technical considerations are presented which proved necessary to produce a superb examination. This new routine represents a reduction in the number of films advocated by Welin and Miller in earlier publications. The findings are compatible with both air contrast and full column techniques.
In double contrast enemas, the rectum and distal sigmoid can easily be examined with a high degree of accuracy. This requires adequate drainage and good air distension of this segment of the colon. Methods are outlined by which this can easily be accomplished.
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