off-center

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off-center

said of an x-ray beam which is not centered exactly over the part to be examined; the rays will be diverging as they pass it and the image will be distorted.
References in periodicals archive ?
To Oe (to whom the epilogue is devoted and to whom Off Center as a whole is dedicated), Miyoshi accords a spot as the "most formidable figure in the literary world of Japan now.
To demonstrate the effect, Shinbrot and Ottino turned to an apparatus consisting of two cylinders, one inside the other but placed off center.