Effective dose estimates for cone beam computed tomography in interventional radiology
1Department of Diagnostic Radiology, Singapore General Hospital, Outram Road, Singapore, 169608, Singapore, kwok.yew.mun@sgh.com.sg.
European Radiology
|June 25, 2013
Summary
Radiation doses from cone beam computed tomography (CBCT) and multi-detector computed tomography (MDCT) were compared. CBCT and MDCT showed similar doses for head imaging, but CBCT had higher doses for abdominal imaging.
Area of Science:
- Radiological physics
- Medical imaging
- Radiation dosimetry
Background:
- Cone beam computed tomography (CBCT) is increasingly used in interventional radiology.
- Understanding radiation dose differences between CBCT and multi-detector computed tomography (MDCT) is crucial for patient safety.
- Standard manufacturer protocols were used for dose comparison.
Purpose of the Study:
- To compare radiation doses between CBCT and MDCT systems.
- To evaluate effective dose estimates for head and abdominal imaging protocols.
- To identify potential dose disparities in clinical applications.
Main Methods:
- Radiation doses were assessed using a dosimetric phantom with thermoluminescent dosimeters.
- Effective dose estimates were calculated based on organ doses and ICRP 2007 tissue weighting factors.
- Protocols from two CBCT systems and one MDCT system were evaluated for head and abdominal imaging.
Main Results:
- Effective doses for head imaging were comparable between CBCT and MDCT (4.4-5.4 mSv vs. 4.3 mSv).
- Eye doses were similar for one CBCT and MDCT (173.6 mGy vs. 148.4 mGy) but significantly higher than the second CBCT (44.6 mGy).
- Effective doses for abdominal imaging were higher for CBCT systems (15.0-37.0 mSv) compared to MDCT (9.8-13.5 mSv).
Conclusions:
- Radiation dose levels for CBCT and MDCT are comparable for head imaging studies.
- CBCT systems demonstrate higher radiation doses compared to MDCT for abdominal imaging.
- Significant variations in eye dose were observed between different CBCT systems.
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