This document discusses high frequency techniques for generating x-rays, also known as multipulse techniques. It describes how using higher frequencies allows generating high voltages with smaller, lighter transformers compared to conventional 50/60Hz techniques. The key is an oscillator circuit that rapidly triggers thyristors to generate damped half-sine waves in the transformer primary, inducing high voltage half-sine waves in the secondary. By triggering the thyristors in sequence, the combined waves form a high frequency output that can be rectified and filtered to provide a steady high voltage for x-ray tubes. This overcomes limitations of conventional techniques and allows for compact, variable frequency x-ray sources.

Technical Fundamentals of Radiology and CT - Ch12 - High Frequency Technique Multipulse PDF

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