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An attempt has been made to develop heavy atom containing transparent plastic filters which are identical with conventional aluminum or copper filters in X-ray attenuating property. These transparent filters can be used as fixed at the front of a conventional multilayer collimator without obstructing the optical detection of the field size of X-ray exposure. It has become a serious problem that recent increasing use of X-ray in diagnostics, namely increasing patient exposure, may cause baneful influence upon the patients. To reduce such patient exposure, the I.C.R.P. has recommended the proper use of metal filters made of aluminum or copper with regards to the applied tube potential. These filters are generally used as fixed at the X-ray tube window or used at the front of a multilayer collimator as added filters. In the former case, an exchange of filters to select the best one with regards to the applied tube potential needs complicated works, and in the latter, the use of the added filters also needs complicated works to confirm field size before each radiography. These troublesome works have at times resulted in improper uses of the filters although the effective selection of filters is known to be useful to the reduction of patient exposure. Therefore, the problem of reduction of patient exposure by means of filtration still remains practically unsolved. To offer practical added filters which do not possess above mentioned disadvantages of metal filters, we tried to develop transparent added filters. Transparent plastics as the material of the filters were loaded with heavy atoms to equalize X-ray attenuating property with aluminum or copper.
公益社団法人日本放射線技術学会の論文
1980-03-01

透明フィルタの試作について

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