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Effective dose range for dental cone beam computed tomography scanners
Ruben Pauwels1, Jilke Beinsberger, Bruno Collaert
1Oral Imaging Center, School of Dentistry, Oral Pathology and Maxillofacial Surgery, Faculty of Medicine, Catholic University of Leuven, Belgium. ruben.pauwels@med.kuleuven.be
European Journal of Radiology
|January 4, 2011
Summary
Effective dose from cone beam computed tomography (CBCT) scanners varies significantly, with a 20-fold range observed. Optimizing CBCT protocols based on field size and diagnostic needs is crucial for patient safety.
Area of Science:
- Medical Physics
- Radiology
- Radiation Dosimetry
Background:
- Cone beam computed tomography (CBCT) is widely used in dentistry and medicine.
- Variations in CBCT scanner protocols and geometries can lead to significant differences in patient radiation dose.
- Accurate estimation of organ and effective dose is essential for radiation protection.
Purpose of the Study:
- To quantify the absorbed organ dose and effective dose across a diverse range of CBCT scanners.
- To investigate the impact of different exposure protocols and geometries on radiation dose.
- To establish dose benchmarks for various CBCT devices.
Main Methods:
- Utilized anthropomorphic phantoms with LiF detectors (TLD-100 and TLD-100H) to measure doses in radiosensitive organs.
- Conducted measurements on 14 different CBCT devices, covering a spectrum of manufacturers and models.
- Calculated effective dose according to the International Commission on Radiological Protection (ICRP) 103 (2007) guidelines.
Main Results:
- Effective dose varied widely, ranging from 19 to 368 μSv.
- Remainder tissues, salivary glands, and the thyroid gland received the largest dose contributions.
- Observed significant variations in organ doses attributed to differences in exposure factors, beam dimensions, and organ positioning.
Conclusions:
- A substantial 20-fold range in effective dose exists among CBCT devices, necessitating differentiation between small, medium, and large field-of-view scanners.
- CBCT dose should be evaluated in conjunction with image quality, considering varying requirements for different patient groups and clinical indications.
- Optimizing radiation dose involves careful selection of exposure parameters and field size tailored to specific diagnostic needs.
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