Picture of the Pan Scanner, front and back side. This design was an attempt to develop system that did not require full immersion but could still take advantage of a controlled sound beam (focus) and compound scanning. The tank was semi-circular with plastic film in contact with the skin of the patient. In those days there was no computer to reconstruct the images. The team used photographic film. A camera, with an open shutter, recorded the signals on the CRT in term of bright spots on the monitor. It took four or five "hits" from the same internal structure for the "spot" to bright enough to record on the film. While the image could be seen developing on the CRT, one had to wait till the film was developed to see the final product.
-- from Mr. Posakony.
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