What display mode was primary for early devices like the one used by Edler and Hertz?
Answer
A-mode (Amplitude mode)
The initial diagnostic devices, including the modified industrial flaw detector utilized by Inge Edler and Carl Hellmuth Hertz, predominantly employed A-mode, which stands for Amplitude mode. This mode of display presents the ultrasound information along a single spatial line. Specifically, A-mode visualizes the signal strength of the returning echoes as vertical deflections or spikes along this single axis. While this provided crucial depth information based on the time delay of the returning echo, it was inherently limited as it could not create a spatial map or cross-sectional image of the underlying anatomy, requiring the subsequent development of other modes for comprehensive visualization.
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