title: [Dose measurements during mammography using a grid (author's transl)].
abstract: In order to increase film contrast, the Mammo Diagnost U (Philips) has been equipped with a newly developed grid. The apparatus was used with a film-screen combination in a clinical investigation (film: 3M type M,  screen: Kodak Min R, cassette: Kodak Min R). The paper deals with dose measurements on patients and phantoms who had been x-rayed by the apparatus. Measurements were carried out with a low kv. chamber and a LiF dose meter which were calibrated for various kv. ranges. The tissue equivalent phantom was a modification of the phantom substance M3; this was preferred to the usual substances such as Plexiglass or Vestyron because of its more suitable physical properties. A breast compressed to 5 cm. irradiated with 35 kv. receives an entry dose of about 1.4mC/kg. (5.3 R) corresponding to a maximal surface dose of about 31 mGy (3.1 rd.). In order to determine radiation dose to patients, measurements were carried out on an Alderson phantom using four different techniques. Surface dose to the contralateral breast and the lens was about 1% and .1% of maximal surface dose of the irradiated breast. Gonadal dose was less than 0.4 muGy (40murd.) per exposure.
mesh_terms: D005260:Female; D006801:Humans; D008327:Mammography / Q000295:instrumentation*; D008433:Mathematics; D008961:Models, Structural; D011829:Radiation Dosage
vernacular_title: Dosismessungen bei der Rastermammographie.