Algorithm-based artifact reduction in patients with arms-down positioning in computed tomography |
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| Affiliation: | 1. Department of Urology, University Hospital Basel, Spitalstrasse 21, CH-4031 Basel, Switzerland;2. Laboratory of Biomechanics and Biocalorimetry (LOB2), Faculty of Medicine, University of Basel, c/o Biozentrum-Pharmazentrum, Klingelbergstrasse 50-70, 4056 Basel, Switzerland;1. Department of Clinical Radiology, Hospital of the Ludwig-Maximilians-University of Munich, Downtown Campus, Nußbaumstr. 20, Munich 80336, Germany;2. Department of Forensic Medicine, Hospital of the Ludwig-Maximilians-University of Munich, Munich, Germany;3. University Center of Legal Medicine Lausanne–Geneva, University Hospital of Lausanne, Lausanne, Switzerland;1. Department of Radiology, Pusan National University, Yangsan Hospital, Republic of Korea;2. Department of Radiology, Pusan National University Hospital, Republic of Korea;3. Deputy General Manager, CT Research Team, GE Healthcare, Republic of Korea;4. Department of Orthopedic Sugery, Pusan National University, Yangsan Hospital, Republic of Korea;1. Radiography and Diagnostic Imaging, School of Medicine, University College Dublin, Health Sciences Centre, Belfield, Dublin 4, Ireland;2. Radiology Department, University Hospital Galway, Newcastle Road, Galway, Ireland;1. Graduate School of Health Sciences, Kumamoto University, Kumamoto, Japan;2. Department of Radiology, Kumamoto University Hospital, Kumamoto, Japan;3. Department of Medical Physics, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan;4. The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, USA;5. Department of Diagnostic Radiology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan |
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| Abstract: | PurposeArm-artifact, a type of streak artifact frequently observed in computed tomography (CT) images obtained at arms-down positioning in polytrauma patients, is known to degrade image quality. This study aimed to develop a novel arm-artifact reduction algorithm (AAR) applied to projection data.MethodsA phantom resembling an adult abdomen with two arms was scanned using a 16-row CT scanner. The projection data were processed by AAR, and CT images were reconstructed. The artifact reduction for the same phantom was compared with that achieved by two latest iterative reconstruction (IR) techniques (IR1 and IR2) using a normalized artifact index (nAI) at two locations (ventral and dorsal side). Image blurring as a processing side effect was compared with IR2 of the model-based IR using a plastic needle phantom. Additionally, the projection data of two clinical cases were processed using AAR, and the image noise was evaluated.ResultsAAR and IR2 significantly reduced nAI by 87.5% and 74.0%, respectively at the ventral side and 84.2% and 69.6%, respectively, at the dorsal side compared with each filtered back projection (P < 0.01), whereas IR1 did not. The proposed algorithm mostly maintained the original spatial resolution, compared with IR2, which yielded apparent image blurring. The image noise in the clinical cases was also reduced significantly (P < 0.01).ConclusionsAAR was more effective and superior than the latest IR techniques and is expected to improve the image quality of polytrauma CT imaging with arms-down positioning. |
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| Keywords: | Computed tomography Artifact Polytrauma Image quality Reconstruction algorithm |
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