Comparison of Organs at Risk Dose in Conventional (2-Dimensional) and Conformal (3-Dimensional) Radiotherapy of Seminoma

Document Type : Original Article (s)

Authors

1 MSc Student, Department of Medical Physics, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran

2 Assistant Professor, Department of Radiotherapy, School of Paramedicine, Kurdistan University of Medical Sciences AND Department of Radiotherapy and Oncology, Tohid Hospital, Sanandaj, Iran

3 Associate Professor, Department of Oncology and Radiotherapy, Seyedolshohada Hospital, Isfahan, Iran

4 Professor, Department of Medical Physics, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran

Abstract

Background: The aim of this study was to predict and compare the dose received by normal critical organs in radiotherapy of stage one seminoma in conventional (2-dimensional or 2D) and conformal (3-dimensional or 3D) methods.Methods: Conventional treatment was designed based on bony anatomy, and conformal treatment based on vessels and nodal anatomy, for 10 patients with 6-MV photon and total dose of 25 Gy. Dose distribution of inside and outside of field was measured (with the profiler system) and calculated (with a treatment planning system).Findings: Mean received dose was 5.58 and 7.16, 20.67 and 19.29, 5.20 and 3.19, 9.73 and 6.43, 5.96 and 7.60 Gy for kidneys, pancreas, liver, stomach, and colon in conventional and conformal methods, respectively. For organs out of the field, mean received dose was 1.55 and 1.48 Gy for right and left kidneys in conventional and conformal methods, respectively. Moreover, the mean received dose by testis was 7 and 6 cGy in conventional and conformal methods, respectively.Conclusion: In conformal treatment method, due to more accurate design of target volume, probability of recurrence was less, and the damage to kidneys and colon was predicted more.

Keywords

References

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Journal of Isfahan Medical School
Volume 36, Issue 478 - Serial Number 478
March and April 2018
Pages 466-471

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History

  • Receive Date: 10 December 2017
  • Revise Date: 01 November 2024
  • Accept Date: 06 April 2022

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