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Updated: Mar 5, 2026
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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
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Imaging practices and radiation doses from imaging in radiotherapy
Teemu Siiskonen1, Sampsa Kaijaluoto1, Tudor Florea2
1STUK - Radiation and Nuclear Safety Authority, P.O. Box 14, FI-00881 Helsinki, Finland.
Summary
Radiotherapy imaging practices vary significantly between clinics, leading to large differences in patient organ doses. Optimizing imaging techniques is crucial for reducing cumulative radiation exposure during image-guided radiotherapy.
Area of Science:
- Medical Physics
- Radiotherapy
- Radiation Dosimetry
Background:
- Accurate patient positioning in radiotherapy relies on frequent imaging.
- Image-guided radiotherapy (IGRT) necessitates understanding patient dose from imaging procedures.
Purpose of the Study:
- To assess current imaging practices in Finnish radiotherapy clinics.
- To evaluate patient organ dose variations in IGRT from an optimization perspective.
Main Methods:
- Analysis of imaging strategies across five Finnish radiotherapy centers.
- Assessment of organ absorbed doses based on imaging technique and frequency.
Main Results:
- Significant variations in imaging strategies and organ doses were observed.
- Cone beam computed tomography (CBCT) organ doses showed large variability (10-50x in breast, 5x in prostate).
- Cumulative imaging organ dose could vary by over tenfold for identical treatments.
Conclusions:
- Current IGRT imaging protocols lack standardization, leading to dose inequalities.
- There is a need to enhance awareness and optimization of imaging doses in IGRT.
- Standardizing imaging techniques can improve patient dose management in radiotherapy.
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