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The boxlike device attached under the tube housing that allows the limited operator to vary the size of the radiation field is called a: A. collimator B. transformer C. detent D. tube port {Ans: A. collimator}collimation and light beam restriction does what? {Ans: decreases irradiated tissue volume =decreases scatter radiation production which results in increased image contrast-and decreased receptor exposure-reduces pt exposure-reduces occupational exposure----IMAGE quality improves with smaller collimated fields...as long as anatomic area isnt compromised}... {Ans: radiographic table}The mediium that transforms the xray beam into a visible image; radiographic film or a phosphorescent screen {Ans: Image Receptor (IR)}what is a mechanical or electrical lock to prevent movement of the XRAY tube {Ans: detent}collimator {Ans: a devise used to restrict xray beam}