SOME OBSERVATIONS ON THE PRACTICAL USES OF A-MODE ULTRASOUND
Barry B. Goldberg, J. Stauffer Lehman · American Journal of Roentgenology · 1969
D URING the past decade there has been an increasing recognition and acceptance of the value and capabilities of diagnostic ultrasonography as an important addition to the armamentarium of medical diagnostic procedures. Echoencephalography for the determination of the position of the diencephalic midline brain structures has an established posit-ion as a favorable standard procedure in many hospitals and medical centers.2 Echocardiography for the evaluation of cardiac valvular disease and for pericardial effusion also occupies a respect-ed position.4” In the Unit-ed States initial interest in diagnostic ultrasound has been concentrated on the uses of A-mode ultrasonic techniques;’4 however, many of the more recent investigations have been devoted to the application of the more complicated and complex two-dimension B-scan ultra-sonic displays and 9,10,12 Recently, there has been a renewed interest-in the simpler and less complex pro-cedure of A-mode studies and their use as applied to a variety of diagnostic applica-tions. It is the purpose of this presentation to discuss further some of our experiences in the use of A-mode ultrasonography as applied to echo fetal cephalometry, echo-aortography and echodifferentiation of masses as to their cystic or solid nature. Additional observations have been made since our previous publications on these subjects3’’6’7”3 and will be presented. PRINCIPLES OF A-MODE ULTRASONOGRAPHY In the A-mode presentation the reflected ultrasound or echoes are displayed on the face of the oscilloscopic screen as vertical