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An interlaboratory measurement of screen-film speed and average gradient according to ISO 9236-1
E Buhr1, D Bergmann, D Hoeschen
1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany. egbert.buhr@ptb.de
Medical Physics
|March 16, 2000
Abstract:
The speed and average gradient of a conventional screen-film system was measured at four European laboratories. This is the first interlaboratory comparison in which the measurement conditions described in ISO 9236-1 were applied. The four laboratories used calibrated measurement equipment. The values obtained by the four laboratories were within a range of 14% for the speed and within a range of 8% for the average gradient. These variations are consistent with the expected measurement uncertainty.