| 摘要 |
PURPOSE:To display a picture exactly from a heart which is varying, by constituting a camera so that a position of an area of concern, and its size follow a pulsation of the heart automatically, synchronizing with an output of an electrocardiograph. CONSTITUTION:An R wave is taken out from an output Va of an electrocardiograph 10 by an R wave detecting circuit 11, and a synchronizing pulse Vb is generated. A signal Vc whose state is varied as 1 0 and 0 1 at every pulse is outputted by a driving circuit 12. This signal Vc is inputted to X and Y position automatic adjusting circuits 13, 14, and X and Y gain adjusting circuits 15, 16. Said circuits 13-16 are constituted in the same way, respectively and consist of an amplifier, an integrator, a volume, etc., and output a triangular waveform Vd. An initial value is set by manually adjusting a time (t) up to its apex, and the gain alpha. Said 4 triangular waveforms are inputted to synthesizing circuits 2, 3 through a concern area generating circuit 23, are synthesized with an analog X and Y position signal from a position detecting circuit 1, and are sent to a cathode ray tube 4. In this way, a position of an area of concern ROI, and its size become as (g) shown in the figure, and are displayed exactly. |
