Image Optimization and reduction of radiation dose in CT of the paranasal sinuses

Document Type: Conference Proceedings

Authors

1 MSc of Medical Radiation Engineering, Department of Medical Imaging Center, Babol, Iran

2 Professor of Medical Physics, Radiotherapy Physicist, Babolsar Oncology Hospital, Department of Medical Physics, Babol University of Medical Sciences, Babol, Iran.

3 Radiological technology Department faculty of paramedical sciences, Babol University of Medical Science, Babol, Iran

4 Medical Physics, Radiotherapy Physicist, Babolsar Oncology Hospital, Babolsar, Iran

Abstract

Introduction: Since demand for computed tomography (CT) examinations is growing, patients are exposed more frequently to ionizing radiation. To reduce the dose delivered to patients in each scan, CT technologists can change the image acquisition parameters. However, this reduces image quality. Present study aimed to optimize and reduce radiation dose in a CT of the paranasal sinuses while minimizing deterioration of image quality
 
Materials and Methods: We divided the patients into two study groups: Group A was scanned axially and coronally using default parameters, while Group B was scanned axially and coronally using new parameters. The patients’ organ doses were estimated using the ImpactDose calculator. The tube voltage, tube current, pitch, rotation time, and other parameters were then reduced and optimized. After reconstruction and analysis, all of the images were of good diagnostic quality in both groups
Results: Using the new parameters, good agreement was found between the direct and reconstructed images. The CT parameters were reduced by the following proportions: kVp— 16.6%, mA—75%, rotation time—20%, and mAs—80%. However, these reductions did not obscure any anatomical landmarks. These parameters reduced the CTDIw, CTDIvol and DLP by 88.2%, 91.3%, and 91.3% respectively.
Conclusion: In conclusion, the results suggest that the use of a Bone algorithm reduces the total amount of radiation used during CT of the sinuses. We recommend using these parameters in children, in the evaluation of facial trauma, and in emergency CT of the paranasal sinuses

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