Evaluation and routine testing in medical imaging departments. Constancy tests - Method for radiographic cassettes and film changers and film-screen contact and relative sensitivity of the screen-cassette assembly has-tracked-changes even though locally or nationally

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Evaluation and routine testing in medical imaging departments. Constancy tests - Method for radiographic cassettes and film changers and film-screen contact and relative sensitivity of the screen-cassette assembly has-tracked-changes even though locally or nationally1 Scope and object 1. 1 Scope This technical report applies to radiographic cassettes and to film changers used to record an X ray pattern on radiographic film by direct radiography. This technical report applies to radiographic cassettes and film changers that are equipped with intensifying screen(s). This technical report does not apply to specialized radiographic cassettes such as mammographic cassettes, multi section cassettes and cassettes used