Image quality of virtual monochromatic images obtained using 320-detector row CT: A phantom study evaluating the effects of iterative reconstruction and body size |
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| Affiliation: | 1. Department of Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan;2. Research Park, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan;3. Department of Radiological Technology, Keio University Hospital, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan;4. Department of Radiology, Toho University Medical Center Omori Hospital, 6-11-1 Omori-nishi, Ota-ku, Tokyo, 143-8541, Japan;1. Centre for Applied Biomedical Engineering Research (CABER), Health Research Institute (HRI), School of Engineering, Bernal Institute, University of Limerick, Lonsdale Building, Limerick, Ireland;2. Department of Radiology, University Hospital Limerick, Ireland;3. Department of Vascular Surgery, University Hospital Limerick, Ireland;1. Department of Radiology, Health Sciences University, Istanbul Bakirkoy Dr. Sadi Konuk Hospital, Istanbul, Turkey;2. Department of Physical Medicine and Rehabilitation, Health Sciences University, Istanbul Bakirkoy Dr. Sadi Konuk Hospital, Istanbul, Turkey;1. Department of Diagnostic Imaging and Nuclear Medicine, Kyoto University Graduate School of Medicine, 54 Kawaharacho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan;2. Department of Diagnostic Imaging and Interventional Radiology, Kyoto Katsura Hospital, 17 Yamada-Hirao, Nishikyo-ku, Kyoto 615-8256, Japan;1. Nagoya University Graduate School of Medicine, Department of Radiology, 65 Tsurumai-cho, Showa-ku, Nagoya 4668550, Japan;2. Nagoya University Graduate School of Medicine, Department of Thoracic Surgery, Japan;3. Nagoya University Graduate School of Medicine, Department of Radiological and Medical Laboratory Sciences, Japan;1. Department of Radiology, Massachusetts General Hospital, 55 Fruit St, Boston MA 02114, USA;2. Department of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, Technical University of Munich, Ismaningerstr. 22, 81675 Munich, Germany |
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| Abstract: | ObjectivesTo compare the image quality between virtual monochromatic spectral (VMS) images obtained using 320-row detector CT and polychromatic 120-kVp images reconstructed with or without iterative reconstruction using various phantom sizes.Materials and methodsTorso phantoms simulating three patient sizes and containing four syringes filled with water or different contrast media (5, 10, 15 mgI/mL15 mgI/ml) were used. The phantoms were scanned using dual-energy (80/135-kVp) and single-energy (120-kVp) protocols at different settings (20 mGy, 12 mGy, and 6 mGy). VMS images were generated at 1-keV intervals (range, 35–135 keV). Both the VMS images and the single-energy 120-kVp images were reconstructed using filtered back projection (FBP) and adaptive iterative dose reduction 3D (AIDR-3D). The signal-to-noise ratio (SNR), and the contrast-to-noise ratio (CNR) were assessed.ResultsUsing FBP reconstruction, the SNR and CNR of the VMS images were lower than or similar to those of the 120-kVp images for most dose settings. Using AIDR-3D reconstruction, however, the 70-keV VMS images had higher SNRs and CNRs than the 120-kVp images at most settings.ConclusionsThe image quality of VMS images with FBP reconstruction tended to be lower than that of the 120-kVp images. With the use of AIDR-3D, however, approximately 70-keV VMS images had a higher image quality than the 120-kVp images. |
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| Keywords: | Virtual monochromatic image 320-detector row CT Iterative reconstruction |
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