Iron Filters as a Means of Reducing the Dose in Roentgen Examination of the Female Breast
Abstract
FROM STATENS INSTITUTT FOR STRALHYGIENE, OSLO, NORWAY. IRON FILTERS AS A MEANS OF REDUCING THE DOSE I N ROENTGEN EXAMINATION OF THE FEMALE BREAST SEMMAUDAL Attention has long been directed to filters as being the best means of obtaining the most useful quality of roentgen radiation. THORAEUS developed multifilter combinations of tin, copper and aluminium to avoid too much soft radiation in deep therapy. These filters, compared to those of pure copper, are particularly efficient around 250 kV and 300 kV. TROUT, KELLY CATHY & performed a series of measurements with different aluminium filters in the range between 50 to 130 kV for the purpose of establishing a means of reducing the exposure to in the patient in roentgen diagnosis. The work of BOSCHE & FRIK this field must also be mentioned; these authors reported the advantages of iron over copper filters in the 60 to 150 kV roentgen radiation range. Roentgen examination of the female breast is relatively new. The most useful quality of roentgen radiation has been found to lie in the range between 20 kV and 40 kV; the technique has been fully described by EGAN. The aim of the present investigation was to determine