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Patient dose in dual x-ray absorptiometry
M K Lewis1, G M Blake, I Fogelman
1Department of Nuclear Medicine, Guy's Hospital, London, UK.
Summary
This study quantifies radiation effective dose for typical female patients undergoing dual x-ray absorptiometry (DXA) scans on three Hologic models. Results provide essential data for radiation protection in clinical DXA assessments.
Area of Science:
- Medical Physics
- Radiological Health
Background:
- Dual x-ray absorptiometry (DXA) is a standard non-invasive technique for bone mineral assessment in clinical research.
- Accurate estimation of radiation dose is crucial for patient safety during DXA procedures.
Purpose of the Study:
- To estimate the effective radiation dose to a typical female patient from scans performed on three specific DXA scanner models (Hologic QDR-1000, QDR-1000/W, QDR-2000).
- To evaluate radiation doses across various scan modes including total body, lumbar spine (AP and lateral), proximal femur, and distal forearm.
Main Methods:
- Utilized an ionization chamber and tissue-equivalent phantom to measure entrance surface dose and percentage depth-dose curves.
- Employed anatomical data from ICRP-23 (Reference Man) and a body section atlas to estimate organ-absorbed doses.
- Calculated effective dose using ICRP-60 tissue weighting factors, considering the fraction of each organ within the scan field.
Main Results:
- Effective dose estimates were determined for each scan mode on the studied DXA scanners.
- Results are presented both excluding and including ovarian dose to differentiate between postmenopausal and premenopausal women.
Conclusions:
- The study provides essential effective dose data for common DXA scan protocols on specific Hologic equipment.
- Findings contribute to optimizing radiation protection strategies for patients undergoing DXA examinations.