orthodiagram
noun
or·tho·di·a·gram
-ˈdī-ə-ˌgram 
: a tracing showing the outer contours and exact size of an organ (as the heart) made by illuminating the edge of the organ with parallel X-rays through a small movable aperture and marking the outer edge of the shadow cast upon a fluoroscopic screen
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“Orthodiagram.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/orthodiagram. Accessed 29 Nov. 2024.
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