Reducing CT radiation dose with iterative reconstruction algorithms: The influence of scan and reconstruction parameters on image quality and CTDIvol
| Autor: | Alexander Stork, Thorsten Klink, Verena Carola Obmann, Gerhard Adam, Philipp G. C. Begemann, Johannes T. Heverhagen |
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| Rok vydání: | 2014 |
| Předmět: |
Observer Variation
Radon transform Phantoms Imaging Image quality business.industry Noise reduction Computed tomography dose index General Medicine Iterative reconstruction Signal-To-Noise Ratio Radiation Radiation Dosage Imaging phantom Region of interest Image Processing Computer-Assisted Radiographic Image Interpretation Computer-Assisted Medicine Radiology Nuclear Medicine and imaging Tomography X-Ray Computed Nuclear medicine business Algorithms |
| Zdroj: | European Journal of Radiology. 83:1645-1654 |
| ISSN: | 0720-048X |
| DOI: | 10.1016/j.ejrad.2014.05.033 |
| Popis: | OBJECTIVES In this phantom CT study, we investigated whether images reconstructed using filtered back projection (FBP) and iterative reconstruction (IR) with reduced tube voltage and current have equivalent quality. We evaluated the effects of different acquisition and reconstruction parameter settings on image quality and radiation doses. Additionally, patient CT studies were evaluated to confirm our phantom results. METHODS Helical and axial 256 multi-slice computed tomography scans of the phantom (Catphan(®)) were performed with varying tube voltages (80-140kV) and currents (30-200mAs). 198 phantom data sets were reconstructed applying FBP and IR with increasing iterations, and soft and sharp kernels. Further, 25 chest and abdomen CT scans, performed with high and low exposure per patient, were reconstructed with IR and FBP. Two independent observers evaluated image quality and radiation doses of both phantom and patient scans. RESULTS In phantom scans, noise reduction was significantly improved using IR with increasing iterations, independent from tissue, scan-mode, tube-voltage, current, and kernel. IR did not affect high-contrast resolution. Low-contrast resolution was also not negatively affected, but improved in scans with doses |
| Databáze: | OpenAIRE |
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