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[en] If a mass of tissue equivalent material is exposed in turn to wedged and open radiation fields of the same size, for equal times, it is incorrect to assume that the resultant isodose pattern will be effectively that of a wedge having half the angle of the wedged field. Computer programs have been written to address the problem of creating an intermediate wedge field, commonly known as a motorized wedge. The total exposure time is apportioned between the open and wedged fields, to produce a beam modification equivalent to that of a wedged field of a given wedge angle. (author)
Source
International Atomic Energy Agency, Vienna (Austria); European Commission, Brussels (Belgium); Pan American Health Organization, Washington, DC (United States); World Health Organization, Geneva (Switzerland); 916 p; Mar 2001; p. 644-646; International conference on radiological protection of patients in diagnostic and interventional radiology, nuclear medicine and radiotherapy; Malaga (Spain); 26-30 Mar 2001; IAEA-CN--85-79; ISSN 1563-0153; 
; 1 ref., 1 fig., 1 tab
; 1 ref., 1 fig., 1 tab