Ultrasonic tomography of the heart : an intracardiac scan method

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Summary The application of diagnostic ultrasound to heart disease is a new field in medical and surgical practice and investigation. In this paper an ultrasonic scanning method of the inside of the heart, using intravenous ultrasonic probes, is described in principle and procedure, ultrasonic tomograms, by ppi display, are also presented. The C-scan with the intracardiac method produces a flat image of the interatrial septum and this method can produce a series of horizontal tomograms of the heart structure. In animal experiments, such structures as the right and left atrial walls, interatrial septums and right ventricles and aortas could be identified, suggesting the value of the method of diagnosis in clinical practice. Some of the clinical cases revealed that ultrasonic cardiac tomography with the ultrasonic intravenous probe could be a unique approach to patho-physiology and diagnosis of disorders of the heart. To nullify the effect of the heart movement a modified equipment has been introduced in which a servo-mechanism, to control the scanner, in synchronism with an ecg, is involved. The result is satisfactory.

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