Large screen image amplification with closed-circuit television employing television tape-recorder.

The ever increasing public emphasis on the hazards of radiation and the ever expanding fields of motion radiography present challenges to the radiologist and to the manufacturer of x-ray equipment. At the same time that more extensive use of motion studies is made, every effort must be concentrated on limiting the amount of radiation during any given examination. The recently opened x-ray department at the Children's Hospital of Pittsburgh utilizes television tape-recording of the fluoroscopic image, mediated through a newly developed image Orthicon television camera2 optically coupled to a 9-inch image amplifier. The system permits recording on television tape and simultaneous viewing on the closed-circuit television monitor at the same low levels of radiation as are required for closed-circuit television viewing alone. This paper will outline some of the considerations that went into the planning of the department. Image amplifiers with field diameters of 4 1/2 and 5 inches have been available for nine ...