Evaluation of patient organ doses from kilovoltage cone-beam CT imaging in radiation therapy


Özseven A. , Dirican B.

Reports of Practical Oncology and Radiotherapy, vol.26, no.2, pp.251-258, 2021 (Journal Indexed in ESCI)

  • Publication Type: Article / Article
  • Volume: 26 Issue: 2
  • Publication Date: 2021
  • Doi Number: 10.5603/rpor.a2021.0038
  • Title of Journal : Reports of Practical Oncology and Radiotherapy
  • Page Numbers: pp.251-258

Abstract

Background: Currently, CBCT system is an indispensable component of radiation therapy units. Because of that, it is important

in treatment planning and diagnosis. CBCT is also an crucial tool for patient positioning and verification in image-guided

radiation therapy (IGRT). Therefore, it is critical to investigate the patient organ doses arising from CBCT imaging. The purpose

of this study is to evaluate patient organ doses and effective dose to patients from three different protocols of Elekta Synergy

XVI system for kV CBCT imaging examinations in image guided radiation therapy.

Materials and methods: Organ dose measurements were done with thermoluminescent dosimeters in Alderson RA NDO

male phantom for head & neck (H&N), chest and pelvis protocols of the Elekta Synergy XVI kV CBCT system. From the measured

organ dose, effective dose to patients were calculated according to the International Commission on Radiological Protection

103 report recommendations.

Results: For H&N, chest and pelvis scans, the organ doses were in the range of 0.03–3.43 mGy, 6.04–22.94 mGy and 2.5–25.28

mGy, respectively. The calculated effective doses were 0.25 mSv, 5.56 mSv and 4.72 mSv, respectively.

Conclusion: The obtained results were consistent with the most published studies in the literature. Although the doses to

patient organs from the kV CBCT system were relatively low when compared with the prescribed treatment dose, the amount

of delivered dose should be monitored and recorded carefully in order to avoid secondary cancer risk, especially in pediatric

examinations.

Key words: kV CBCT; equivalent organ dose; effective dose; image guided radiation therapy; Alderson Rando phantom

Rep Pract Oncol Radiother 2021;26(2):251–258