Helical tomotherapy shielding calculation for an existing LINAC treatment room: sample calculation and cautions
| Autor: | James A Purdy, Chuan Wu, Fanqing Guo |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Physics
medicine.medical_specialty Models Statistical Radiological and Ultrasound Technology Radiotherapy medicine.medical_treatment Nuclear engineering Radiotherapy Planning Computer-Assisted Treatment room Radiotherapy Dosage Equipment Design Linear particle accelerator Tomotherapy Radiotherapy High-Energy Radiation Protection Beam delivery Radiation Monitoring Electromagnetic shielding medicine Humans Radiology Nuclear Medicine and imaging Medical physics Radiotherapy Conformal Radiometry Leakage (electronics) |
| Zdroj: | Physics in medicine and biology. 51(21) |
| ISSN: | 0031-9155 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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