| 摘要 |
Disclosed is a visibility expander of relatively simple and inexpensive construction for use in reading X-ray photographs. It comprises a TV picture tube and monitor coupled, together via a low pass filter and window amplifier in series as stated. Both the expansion factor and the midpoint of the window(amplifier transfer characteristics are continuously variable so that the operator may better detect changes to picture contrasts. It may be used by doctors, X-ray technicians, investigative agencies and others who need a simple and inexpensive device for analyzing X-ray photographs.
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