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Advances in radiotherapy planning reduced the volumes of irradiated normal tissue and allowed safe dose escalation in prostate cancer. Image-guided radiotherapy solutions to prostate and bladder cancer offer further improvements. The initial process is understanding the causes and extent of internal organ motion, followed by development of equipment and protocols to minimise geographical miss. Further...
A circuit is described for achieving dynamic stability in a low-powered tuned-circuit magnetic levitator. A field-effect transistor is used as a controllable resistance to give velocity-feedback damping. The circuit uses standard components only, and the system is particularly suitable for vacuum applications.
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