Accuracy of a CT-Ultrasound Fusion Imaging Guidance System Used for Hepatic Percutaneous Procedures |
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| Affiliation: | 1. Department of Radiology, Hôpital d’Annecy, 1 avenue de l’Hôpital, 74374 Metz-Tessy, France;2. ICUBE Laboratory, Université de Strasbourg, Centre National de la Recherche Scientifique, Strasbourg, France;3. Interventional Radiology Department, Hôpitaux Universitaires de Strasbourg, Strasbourg, France;1. Department of Vascular Surgery, Zhongshan Hospital, Institute of Vascular Surgery, Fudan University, 180 Fenglin Road, 200032, Shanghai, China;2. Department of Radiology, Zhongshan Hospital, Fudan University, and Shanghai Institute of Medical Imaging, Shanghai, China;3. Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China;1. Department of Imaging, Interventional Ultrasound Unit, Pineta Grande Hospital, Castel Volturno, Italy;2. Department of Diagnostic Radiology, Valduce Hospital, Como, Italy;3. Department of Internal Medicine, School of Medicine, 2nd University of Napoli, Napoli, Italy;4. Department of Radiology and Department of Biomedical Engineering, University of Wisconsin School of Medicine and Public Health, Medison, United States;5. 2nd Surgery Department, Hepato-bilio-pancreatic and digestive Surgery Unit, San Paolo Hospital, Milano, Italy;6. Department of Diagnostic Radiology, School of Medicine, University of Milano-Bicocca, San Gerardo Hospital, Monza, Italy;1. Division of Interventional Radiology, Department of Radiology, David Geffen School of Medicine at University of California, Los Angeles, 757 Westwood Plaza, Room 2125, Los Angeles, CA 90095;2. Department of Radiology and Surgery, St. Johns Health Center, Santa Monica, California;1. Division of Interventional Radiology, Stanford University School of Medicine, 300 Pasteur Drive, H3630, Stanford, CA 94305-5642;2. Faculty Development and Diversity, Stanford University School of Medicine, 300 Pasteur Drive, H3630, Stanford, CA 94305-5642 |
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| Abstract: | PurposeTo evaluate the accuracy of a fusion imaging guidance system using ultrasound (US) and computerized tomography (CT) as a real-time imaging modality for the positioning of a 22-gauge needle in the liver.Materials and MethodsThe spatial coordinates of 23 spinal needles placed at the border of hepatic tumors before radiofrequency thermal ablation were determined in 23 patients. Needles were inserted up to the border of the tumor with the use of CT-US fusion imaging. A control CT scan was carried out to compare real (x, y, z) and virtual (x′, y′, z′) coordinates of the tip of the needle (D for distal) and of a point on the needle located 3 cm proximally to the tip (P for proximal).ResultsThe mean Euclidian distances were 8.5 ± 4.7 mm and 10.5 ± 5.3 mm for D and P, respectively. The absolute value of mean differences of the 3 coordinates (|x′ − x|, |y′ − y|, and |z′ − z|) were 4.06 ± 0.9, 4.21 ± 0.84, and 4.89 ± 0.89 mm for D and 3.96 ± 0.60, 4.41 ± 0.86, and 7.66 ± 1.27 mm for P. X = |x′ − x| and Y = |y′ − y| coordinates were <7 mm with a probability close to 1. Z = |z′ − z| coordinate was not considered to be larger nor smaller than 7 mm (probability >7 mm close to 50%).ConclusionsPositioning errors with the use of US-CT fusion imaging used in this study are not negligible for the insertion of a 22-gauge needle in the liver. Physicians must be aware of such possible errors to adapt the treatment when used for thermal ablation. |
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| Keywords: | US" },{" #name" :" keyword" ," $" :{" id" :" kwrd0025" }," $$" :[{" #name" :" text" ," _" :" ultrasound |
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