An x-ray imager system of the type that indicates alignment of patient treatment field with x-ray field, using fluorescence screen and imaging sensor, has a cabinet that permits selection of two pre- determinable orientations of cabinet parts mounting the fluorescence screen and sensor (1) at 90° to each other and (2) in linear alignment with each other, by pivoting of upper and lower portions of the cabinet relative to each other. For this, any axially aligned ring- bearing fixed at 45° to the vertical rotatively joins together respective 45° diagonal ends of the cabinet parts, and a detent holds the diagonal ends in either of the two pre-determinable positions of the cabinet parts to each other. A mirror that relays the image at one orientation can be retracted from position in the light path to avoid the beam, when not used.
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