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Abstract

Apparatus for generating a triggering signal to an x-ray machine in accordance with the respiration of a subject. A trigger signal is selectably generated to the x-ray machine just prior to occurrence of a selected respiration extrema. The value of the respiration signal at a sample occurring just after detection of the selected extrema is stored, and modified in accordance with the resolution of the system. The x-ray trigger signal is generated, if not otherwise inhibited, upon detection of the next occurrence of the modified value in the respiration wave form. Apparatus for generating signals indicative of respiration rate, respiration extrema, and heart rate is also disclosed. Apnea alarms are generated if a predetermined decrease in respiration rate is detected in successive periods in conjunction with a predetermined number of decelerating heart beats. An alarm also generated if the respiration rate and heart rate signals appear to indicate that the respiration and heart rates are equal for a predetermined number of periods, or if the respiration or heart rates stray outside of preset threshold values. Provisions are included for adaptive DC offset, and to eliminate electromagnetic interference. Amplitude, time domain, and slew rate discrimination against artifacts are also provided.

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