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16.4 Electron Microscope -- Part 2
X-ray computerized tomography (CT Scan) was developed in the 1960s.
A thin beam of X-rays passes through the plane we want to see and is detected by an opposing detector.
The process is repeated around the object after the angle is changed by a small amount.
While at each position, the detected signal carries integrated information about the full path, two paths that intersect contain common information about the one point of intersection.
Information about the X-ray transmission properties of each point within the plane of the object is contained in the multiple images obtained by translation and rotation.
A point by point image is constructed of the thin slice scanned within the body after these signals are stored.
The slices obtained in this way are typically about 2mm thick.
In the newer versions of the instrument, a fan rather than a beam of X-rays scans the object, and an array of multiple detectors is used to record the signal.
This method of data acquisition yields an image in a few seconds.
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