Clinical evaluation of a commercial surface-imaging system for patient positioning in radiotherapy

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• 作者：F. Stieler PhD (1)
  F. Wenz (1)
  D. Scherrer (1)
  M. Bernhardt (1)
  F. Lohr (1)
  
• 关键词：Image ; guided radiotherapy ; Optical surface laser scanner ; Cone ; beam computed tomography ; Patient positioning ; Tumor location ; Bildgesteuerte Strahlentherapie ; Optischer Oberfl?chenscanner ; Digitale Volumentomographie ; Patientenpositionierung ; Tumorlokalisationen
• 刊名：Strahlentherapie und Onkologie
• 出版年：2012
• 出版时间：December 2012
• 年：2012
• 卷：188
• 期：12
• 页码：1080-1084
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• 作者单位：F. Stieler PhD (1)
  F. Wenz (1)
  D. Scherrer (1)
  M. Bernhardt (1)
  F. Lohr (1)
  
  1. Department of Radiation Therapy and Radiation Oncology, University Medical Center Mannheim, University of Heidelberg, Theodor-Kutzer-Ufer 1-3, 68167, Mannheim, Germany
  
• ISSN：1439-099X

文摘

Background Laser scanning-based patient surface positioning and surveillance may complement image-guided radiotherapy (IGRT) as a nonradiation-based approach. We investigated the performance of an optical system compared to standard kilovoltage cone-beam computed tomography (CBCT) and its potential to reduce the number of daily CBCTs. Patients and methods We analyzed the patient positioning of 153 treatment fractions in 21 patients applied to three different treatment regions. Patients were first scanned with CBCT, shifted to the optimal isocenter position, and an optical scan was performed to verify the matching in relation to CBCT. Results For the head-and-neck region, the lateral/longitudinal/vertical/rotational/roll and pitch shift was 0.9?±-.8?mm/?.7±-.8?mm/?.8±-.6?mm/0.0±-.1°/?.5±-.1°/0.2±-.6°. For the thorax, the lateral/longitudinal/vertical/roll and pitch shift was ?.2±-.6?mm/0.8±-.1?mm/0.8±-.3?mm/0.6±-.4°/0.1±-.9°/0.3±-.0°. For the pelvis, the respective values were ?.5±-.1?mm/4.6±-.3?mm/?.1±-.4?mm/0.3±-.1°/-0.5±-.0°/0.3±-.1°. In total, the recorded disagreement was ?.0±-.6?mm/1.0±-.3?mm/?.8±-.9?mm/0.3±-.2°/?.3±-.5°/0.2±-.7°. Conclusion This analysis showed good agreement between the optical scanner approach and CBCT. The optical system holds potential to ensure precise patient positioning and reduced CBCT frequency in tumor locations with fixed relation to surface structures.