PubMed · 15067922
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Stephen Sprigle. 2004. Categorizing cushions.. https://pubmed.ncbi.nlm.nih.gov/15067922/
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This paper reports a step-by-step shielding calculation recipe for a helical tomotherapy unit (TomoTherapy Inc., Madison, WI, USA), recently installed in an existing Varian 600C treatment room. Both primary and secondary radiations (leakage and scatter) are explicitly considered. A typical patient load is assumed. Use factor is calculated based on an analytical formula derived from the tomotherapy rotational beam delivery geometry. Leakage and scatter are included in the calculation based on corresponding measurement data as documented by TomoTherapy Inc. Our calculation result shows that, except for a small area by the therapists' console, most of the existing Varian 600C shielding is sufficient for the new tomotherapy unit. This work cautions other institutions facing the similar situation, where an HT unit is considered for an existing LINAC treatment room, more secondary shielding might be considered at some locations, due to the significantly increased secondary shielding requirement by HT.
Although it is well known that Laënnec invented the stethoscope, the story of how he invented it is less well known. This article discusses the many theories behind the story as well as the impact of Laënnec's discovery on the practice of cardiology in the 21st century.