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Patient dose reduction in CT examinations by optimising scanogram acquisition.
K Perisinakis1, J Damilakis, A Voloudaki
1Department of Medical Physics, University of Crete, Faculty of Medicine, PO Box 1393, 711 10 Iraklion, Crete, Greece.
Radiation Protection Dosimetry
|September 11, 2001
Summary
Optimizing computed tomography (CT) scanogram settings significantly reduces radiation dose. Lower settings for head, thorax, and abdomen scanograms were found effective, decreasing patient effective dose without compromising image quality.
Area of Science:
- Medical Imaging
- Radiological Physics
Background:
- Computed tomography (CT) examinations utilize scanograms for anatomical localization.
- Optimizing scanogram parameters is crucial for minimizing radiation exposure during CT procedures.
Purpose of the Study:
- To determine optimal computed tomography (CT) scanogram settings for improved scan localization.
- To evaluate the impact of reduced scanogram settings on radiation dose and image quality.
Main Methods:
- Scanograms of head, thorax, and abdomen were acquired on an anthropomorphic phantom using varied tube voltage and current.
- Entrance skin dose was measured using thermoluminescence dosemeters.
- Effective dose was estimated using normalized organ dose data.
Main Results:
- Acceptable scanogram quality was achieved with lower settings (80 kV/50 mA for head/thorax, 80 kV/75 mA for abdomen) than manufacturer recommendations (120 kV/100 mA).
- This resulted in significant effective dose reductions: 72% for head, 84% for thorax, and 88% for abdomen.
- Overall effective dose reduction of up to 3.5% for complete CT examinations was possible without degrading diagnostic image quality.
Conclusions:
- Optimized CT scanogram settings can substantially reduce patient radiation dose.
- Lower scanogram parameters are effective for localization and do not compromise diagnostic image quality.
- Implementing these optimized settings offers a practical method for dose reduction in CT imaging.