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Volume 25, Number 2, 2020

Prospective evaluation of the setup errors and its impact on safety margin for cervical cancer pelvic conformal radiotherapy

Avinash Badajena, Vijay Parshuram Raturi, Kirti Sirvastava, Hidehiro Hojo, Hajime Ohyoshi, Yanping Bei, Toshiya Rachi, Chen-Ta Wu, Taku Tochinai, Masayuki Okumura, Haiqin Zhang, Hirotaki Kouta, Pragya Verma, Geeta Singh, Abhishek Anand, Anjali Sachan


Aim The primary objective was to assess set-up errors (SE) and secondary objective was to determine optimal safety margin (SM) Background To evaluate the SE and its impact on the SM utilizing electronic portal imaging (EPI) for pelvic conformal radiotherapy. Material and methods 20 cervical cancer patients were enrolled in this prospective study. Supine position with ankle and knee rest was used during CT simulation. The contouring was done using consensus guideline for intact uterus. 50 Gy in 25 fractions were delivered at the isocenter with ≥95% PTV coverage. Two orthogonal (Anterior and Lateral) digitally reconstructed radiograph (DRR) was constructed as a reference image. The pair of orthogonal [Anterior-Posterior and Right Lateral] single exposure EPIs during radiation was taken. The reference DRR and EPIs were compared for shifts, and SE was calculated in the X-axis, Y-axis, and Z-axis directions. Results 320 images (40 DRRs and 280 EPIs) were assessed. The systematic error in the Z-axis (AP EPI), X-axis (AP EPI), and Y-axis (Lat EPI) ranged from -12.0 to 11.8 mm, -10.3 to 7.5 mm, and -8.50 to 9.70 mm, while the random error ranged from 1.60 to 6.15 mm, 0.59 to 4.93 mm, and 1.02 to –4.35 mm. The SM computed were 7.07, 6.36, and 7.79 mm in the Y-axis, X-axis, and Z-axis by Van Herk’s equation, and 6.0, 5.51, and 6.74 mm by Stroom’s equation. Conclusion The computed SE helps defining SM, and it may differ between institutions. In our study, the calculated SM was approximately 8 mm in the Z-axis, 7 mm in X and Y axis for pelvic conformal radiotherapy.

Signature: Rep Pract Oncol Radiother, 2020; 25(2) : 260-265

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