Faster and more accurate patient positioning with surface guided radiotherapy for ultra-hypofractionated prostate cancer patients

Annika Mannerberg, Malin Kügele, Sandra Hamid, Anneli Edvardsson, Kristoffer Petersson, Adalsteinn Gunnlaugsson, Sven Å.J. Bäck, Silke Engelholm, Sofie Ceberg

Research output: Contribution to journalArticlepeer-review

Abstract

Introduction: The aim of this study was to evaluate if surface guided radiotherapy (SGRT) can decrease patient positioning time for localized prostate cancer patients compared to the conventional 3-point localization setup method. The patient setup accuracy was also compared between the two setup methods. Materials and methods: A total of 40 localized prostate cancer patients were enrolled in this study, where 20 patients were positioned with surface imaging (SI) and 20 patients were positioned with 3-point localization. The setup time was obtained from the system log files of the linear accelerator and compared between the two methods. The patient setup was verified with daily orthogonal kV images which were matched based on the implanted gold fiducial markers. Resulting setup deviations between planned and online positions were compared between SI and 3-point localization. Results: Median setup time was 2:50 min and 3:28 min for SI and 3-point localization, respectively (p < 0.001). The median vector offset was 4.7 mm (range: 0–10.4 mm) for SI and 5.2 mm for 3-point localization (range: 0.41–17.3 mm) (p = 0.01). Median setup deviation in the individual translations for SI and 3-point localization respectively was: 1.1 mm and 1.9 mm in lateral direction (p = 0.02), 1.8 and 1.6 mm in the longitudinal direction (p = 0.41) and 2.2 mm and 2.6 mm in the vertical direction (p = 0.04). Conclusions: Using SGRT for positioning of prostate cancer patients provided a faster and more accurate patient positioning compared to the conventional 3-point localization setup.

Original languageEnglish
Pages (from-to)41-45
Number of pages5
JournalTechnical Innovations and Patient Support in Radiation Oncology
Volume19
DOIs
Publication statusPublished - 2021 Sep 1

Subject classification (UKÄ)

  • Other Physics Topics
  • Radiology, Nuclear Medicine and Medical Imaging

Keywords

  • Patient positioning
  • Patient setup time
  • Radiotherapy workflow
  • Surface guided radiotherapy

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