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https://www.readbyqxmd.com/read/28213758/influence-of-a-combined-ct-c-arm-system-on-periprocedural-workflow-and-procedure-times-in-mechanical-thrombectomy
#1
Johannes Pfaff, Silvia Schönenberger, Christian Herweh, Mirko Pham, Simon Nagel, Peter Arthur Ringleb, Sabine Heiland, Martin Bendszus, Markus Alfred Möhlenbruch
OBJECTIVE: To achieve the fastest possible workflow in ischaemic stroke, we developed a CT/C-arm system, which allows imaging and endovascular treatment on the same patient table. METHODS: This prospective, monocentric trial was conducted between October 2014 and August 2016. Patients received stroke imaging and mechanical thrombectomy under general anaesthesia (GA) or conscious sedation (CS) using our combined setup comprising a CT-scanner and a mobile C-arm X-ray device...
February 17, 2017: European Radiology
https://www.readbyqxmd.com/read/28210406/use-of-c-arm-to-assess-reduction-of-zygomatic-complex-fractures-a-comparative-study
#2
Atmakuru Venkata Maheedhar, C Ravindran, Emmanuel D S Azariah
The aim of this study was to analyze the use of C-arm and its significance in accurate reduction of zygomaticomaxillary complex (ZMC) fractures. Orbital volume is used as parameter to compared pre- and postoperative volumes of injured orbit. Differences in orbital volume calculated in cases done with intraoperative imaging and in controls treated without the use of intraoperative imaging were evaluated using Student t-test. C-arm is definitively an effective tool in the armamentarium of oral and maxillofacial surgery in assessment of reduction of ZMC fracture...
March 2017: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/28210189/development-of-a-meso-scale-sma-based-torsion-actuator-for-image-guided-procedures
#3
Jun Sheng, Dheeraj Gandhi, Rao Gullapalli, J Marc Simard, Jaydev P Desai
This paper presents the design, modeling, and control of a meso-scale torsion actuator based on shape memory alloy (SMA) for image-guided surgical procedures. Developing a miniature torsion actuator is challenging, but it opens the possibility of significantly enhancing the robot agility and maneuverability. The proposed torsion actuator is bi-directionally actuated by a pair of antagonistic SMA torsion springs through alternate Joule heating and natural cooling. The torsion actuator is integrated into a surgical robot prototype to demonstrate its working performance in the humid environment under C-Arm CT image guidance...
February 2017: IEEE Transactions on Robotics: a Publication of the IEEE Robotics and Automation Society
https://www.readbyqxmd.com/read/28207655/internally-randomized-control-trial-of-radiation-exposure-using-ultra-low-radiation-imaging-versus-traditional-c-arm-fluoroscopy-for-patients-undergoing-single-level-minimally-invasive-transforaminal-lumbar-interbody-fusion
#4
Timothy Y Wang, S Harrison Farber, Scott S Perkins, Adam G Back, Sarah A Byrd, Debbie Chi, David Vincent, Isaac O Karikari
STUDY DESIGN: Randomized controlled trial. OBJECTIVE: To compare radiation exposure between ultra-low radiation imaging (ULRI) with image enhancement and standard-dose fluoroscopy for patients undergoing minimally invasive transforaminal lumbar interbody fusion (MIS TLIF). SUMMARY OF BACKGROUND DATA: Although the benefits of MIS are lauded by many, there is a significant amount of radiation exposure to surgeon and operating room personnel...
February 15, 2017: Spine
https://www.readbyqxmd.com/read/28206667/geometry-calibration-method-for-a-cone-beam-ct-system
#5
Hongkai Yang, Kejun Kang, Yuxiang Xing
PURPOSE: The positioning accuracy of each component is important to ensure the image quality of cone-beam CT. However, accurate positioning is not easy and requires experience and time. The option is to calibrate the geometric parameters and then plug them into a reconstruction algorithm which is the preferred solution in practice. In this case, the image quality is determined by the accuracy and precision of the calibration method. This work describes a method to independently calibrate an imaging system in each pose (projection angle) for a cone-beam CT with a non-ideal-circular trajectory...
February 16, 2017: Medical Physics
https://www.readbyqxmd.com/read/28192614/cone-beam-ct-based-adaptive-planning-improves-permanent-prostate-brachytherapy-dosimetry-an-analysis-of-1266-patients
#6
Hendrik Westendorp, Carel J Hoekstra, Jos J Immerzeel, Sandrine M G van de Pol, Charles G H J Niël, Robert A J Kattevilder, Tonnis T Nuver, André W Minken, Marinus A Moerland
PURPOSE: To evaluate adaptive planning for permanent prostate brachytherapy and to identify the prostate regions that needed adaptation. METHODS AND MATERIALS: After the implantation of stranded seeds, using real-time intraoperative planning, a transrectal ultrasound (TRUS)-scan was obtained and contoured. The positions of seeds were determined on a C-arm cone-beam Computed Tomography (CBCT)-scan. The CBCT-scan was registered to the TRUS-scan using fiducial gold markers...
February 13, 2017: Medical Physics
https://www.readbyqxmd.com/read/28188485/feasibility-of-laser-guided-percutaneous-pedicle-screw-placement-in-the-lumbar-spine-using-a-hybrid-or
#7
P H Richter, F Gebhard, M Salameh, K Schuetze, M Kraus
PURPOSE: Innovations in intraoperative imaging lead to major changes in orthopaedic surgery. In our setting, a 3D flat-panel c-arm (Artis zeego) is mounted on a robotic arm offering an integrated aiming tool (Syngo iGuide). Our aim was to investigate the feasibility of Syngo iGuide for pedicle screw placement in comparison with fluoroscopic screw implantation. METHODS: In 10 lumbar models, 100 screws were implanted. In 5 models, a standard fluoroscopic technique was used...
February 10, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28184364/tibial-lengthening-using-a-fixator-assisted-lengthening-plate-a-new-technique
#8
Haci Bayram Tosun, Ismail Agir, Seyitali Gumustas, Sancar Serbest, Abuzer Uludag, Suat Celik
BACKGROUND: There are many techniques that are used for limb lengthening. Lengthening a limb over a plate is an alternative choice used in children or when using an intramedullary nail is difficult. OBJECTIVES: In this study, we presented a new technique for tibial lengthening using a monolateral external fixator over a lengthening plate. MATERIALS AND METHODS: For tibial lengthening, a monolateral external fixator was attached to the composite bone model medially...
November 2016: Trauma Monthly
https://www.readbyqxmd.com/read/28168338/radiation-exposure-to-the-patients-in-thoracic-and-lumbar-spine-fusion-using-a-new-intraoperative-cone-beam-computed-tomography-imaging-technique-a-preliminary-study
#9
Ludovic Kaminski, V Cordemans, O Cartiaux, M Van Cauter
PURPOSE: The goals of this paper are to assess the ionizing radiation exposure to the patients during thoracic and lumbar spinal fusion using a new intraoperative 3D imaging system and to evaluate the factors that could explain the variability in the observed doses. METHOD: We retrospectively reviewed 97 patients who underwent posterior instrumented thoracic and/or lumbar spinal fusion from December 2013 to November 2014. Primary data were the total dose area product (total DAP, Gy cm(2)) and total skin dose (total SD, mGy)...
February 6, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28145877/transcatheter-mitral-paravalvular-leak-closure-facilitated-by-preprocedural-cardiac-ct-for-simulation-of-fluoroscopic-anatomy-and-paravalvular-defect-localization
#10
Kasper Korsholm, Ulrik Mortensen, Jesper Møller Jensen, Nicolo Piazza, Pascal Thériault-Lauzier, Jens Erik Nielsen-Kudsk
Paravalvular leakage (PVL) occurs in 6%-15% of cases after surgical heart valve replacement. A percutaneous approach is increasingly used to close PVLs as an alternative to repeat surgery. Computed tomography (CT) can be used for simulation of fluoroscopic cardiac anatomy. This technique allows preprocedural definition of optimal C-arm angulations and PVL localization in reference to fluoroscopic views. It is very helpful for guidewire crossing of the PVL and positioning of the closure device. We report a case with the first use of dedicated software for fluoroscopic simulation (FluoroCT) in transcatheter mitral PVL closure...
February 2017: Journal of Invasive Cardiology
https://www.readbyqxmd.com/read/28134050/how-to-obtain-and-identify-the-acetabular-anterior-column-axial-view-projection-in-patients
#11
Xiaoreng Feng, Huijie Fan, Frankie Leung, Bin Chen
PURPOSE: This study aims at sharing our experience as how to obtain and identify axial view image of the acetabular anterior column in patients. METHODS: Pelvic computed tomography data of six normal adults were used to reconstruct three-dimensional (3D) models. The transparency of each 3D model was downgraded at the view perpendicular to the cross section of the anterior column axis to simulate the anterior column axial view image. Fluoroscopy was performed in all patients to obtain the anterior column axial view image in the operating room...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28126753/evaluation-of-collaterals-and-clot-burden-using-time-resolved-c-arm-conebeam-ct-angiography-in-the-angiography-suite-a-feasibility-study
#12
P Yang, K Niu, Y Wu, T Struffert, A Doerfler, P Holter, B Aagaard-Kienitz, C Strother, G-H Chen
BACKGROUND AND PURPOSE: The assessment of collaterals and clot burden in patients with acute ischemic stroke provides important information about treatment options and clinical outcome. Time-resolved C-arm conebeam CT angiography has the potential to provide accurate and reliable evaluations of collaterals and clot burden in the angiographic suite. Experience with this technique is extremely limited, and feasibility studies are needed to validate this technique. Our purpose was to present such a feasibility study...
January 26, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28117241/a-multicentre-trial-of-patient-specific-rehearsal-prior-to-evar-impact-on-procedural-planning-and-team-performance
#13
L Desender, I Van Herzeele, M Lachat, J Duchateau, C Bicknell, J Teijink, J Heyligers, F Vermassen
OBJECTIVE: Patient specific rehearsal (PsR) prior to endovascular aneurysm repair (EVAR) enables the endovascular team to practice and evaluate the procedure prior to treating the real patient. This multicentre trial aimed to evaluate the utility of PsR prior to EVAR as a pre-operative planning and briefing tool. MATERIAL AND METHODS: Patients with an aneurysm suitable for EVAR were randomised to pre-operative or post-operative PsR. Before and after the PsR, the lead implanter completed a questionnaire to identify any deviation from the initial treatment plan...
January 20, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28110899/adaptive-cone-beam-ct-planning-improves-long-term-biochemical-disease-free-survival-for-125-i-prostate-brachytherapy
#14
M Peters, D A Smit Duijzentkunst, H Westendorp, S M G van de Pol, R Kattevilder, A Schellekens, J R N van der Voort van Zyp, M A Moerland, M van Vulpen, C J Hoekstra
PURPOSE: Determining the independent effect of additional intraoperative adaptive C-arm cone-beam CT (CBCT) planning vs. transrectal ultrasound (TRUS)-guided interactive planning alone in (125)I brachytherapy for prostate cancer (PCa) on biochemical disease-free survival (BDFS). METHODS AND MATERIALS: T1/T2-stage PCa patients receiving TRUS-guided brachytherapy from 2000 to 2014 were analyzed. From October 2006, patients received additional intraoperative adaptive CBCT planning for dosimetric evaluation and subsequent remedial seed placement in underdosed areas...
January 16, 2017: Brachytherapy
https://www.readbyqxmd.com/read/28109724/the-role-of-cone-beam-ct-in-transcatheter-arterial-chemoembolization-for-hepatocellular-carcinoma-a-systematic-review-and-meta-analysis
#15
Leland Pung, Moiz Ahmad, Kerstin Mueller, Jarrett Rosenberg, Christopher Stave, Gloria L Hwang, Rajesh Shah, Nishita Kothary
PURPOSE: To review available evidence for use of cone-beam CT during transcatheter arterial chemoembolization in hepatocellular carcinoma (HCC) for detection of tumor and feeding arteries. MATERIALS AND METHODS: Literature searches were conducted from inception to May 15, 2016, in PubMed (MEDLINE), Scopus, and Cochrane Central Register of Controlled Trials. Searches included "cone beam," "CBCT," "C-arm," "CACT," "cone-beam CT," "volumetric CT," "volume computed tomography," "volume CT," AND "liver," "hepatic*," "hepatoc*...
January 18, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28107246/reliability-and-usefulness-of-intraoperative-3-dimensional-imaging-by-mobile-c-arm-with-flat-panel-detector
#16
Takahito Fujimori, Motoki Iwasaki, Yukitaka Nagamoto, Masafumi Kashii, Masaki Takao, Tsuyoshi Sugiura, Hideki Yoshikawa
STUDY DESIGN: Reliability and agreement study. OBJECTIVE: To assess the reliability of intraoperative 3-dimensional imaging with a mobile C-arm (3D C-arm) equipped with a flat-panel detector. SUMMARY OF BACKGROUND DATA: Pedicle screws are widely used in spinal surgery. Postoperative computed tomography (CT) is the most reliable method to detect screw misplacement. Recent advances in imaging devices have enabled surgeons to acquire 3D images of the spine during surgery...
February 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28075046/a-standardized-fluoroscopy-based-technique-to-measure-intraoperative-cup-anteversion
#17
Matthieu Zingg, Sana Boudabbous, Didier Hannouche, Xavier Montet, Friedrich Boettner
Direct anterior approach (DAA) with the patient lying supine has facilitated the use of intraoperative fluoroscopy and allows for standardized positioning of the patient. The current study presents a new technique to measure acetabular component anteversion using intraoperative fluoroscopy. The current paper describes a mathematical formula to calculate true acetabular component anteversion based on the acetabular component abduction angle and the c-arm tilt angle (CaT). The CaT is determined by tilting the c-arm until an external pelvic oblique radiograph with the equatorial plane of the acetabular component perpendicular to the fluoroscopy receptor is obtained...
January 11, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28066670/image-guided-thoracoscopic-surgery-with-dye-localization-in-a-hybrid-operating-room
#18
Shun-Mao Yang, Wei-Chun Ko, Mong-Wei Lin, Hsao-Hsun Hsu, Chih-Yang Chan, I-Hui Wu, Yeun-Chung Chang, Jin-Shing Chen
BACKGROUND: The rate of detection of small pulmonary nodules (SPNs) has increased. Thoracoscopic resection following image-guided localization had been a reliable alternative in their treatment. We present our experience with image-guided dye localization using robotic C-arm computed tomography (CT) followed by immediate video-assisted thoracoscopic surgery (VATS) for SPNs in a hybrid operating room (OR). METHODS: From July 2015 to July 2016, 25 consecutive patients with SPNs smaller than 2 cm underwent robotic C-arm CT-guided blue dye tattooing followed by immediate VATS in a hybrid OR...
October 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28061010/scatter-correction-using-a-primary-modulator-on-a-clinical-angiography-c-arm-ct-system
#19
Bastian Bier, Martin Berger, Andreas Maier, Marc Kachelrieß, Ludwig Ritschl, Kerstin Müller, Jang-Hwan Choi, Rebecca Fahrig
PURPOSE: Cone beam computed tomography (CBCT) suffers from a large amount of scatter, resulting in severe scatter artifacts in the reconstructions. Recently, a new scatter correction approach, called improved primary modulator scatter estimation (iPMSE), was introduced. That approach utilizes a primary modulator that is inserted between the X-ray source and the object. This modulation enables estimation of the scatter in the projection domain by optimizing an objective function with respect to the scatter estimate...
January 6, 2017: Medical Physics
https://www.readbyqxmd.com/read/28052301/c-arm-cone-beam-computed-tomography-guidance-for-radiofrequency-ablation-in-hepatocellular-carcinoma
#20
Keizo Kato, Hiroshi Abe, Makiko Ika, Takeshi Yonezawa, Yoshiyuki Sato, Noriko Hanawa, Shohei Shimizu, Shinji Endo, Ryota Matsuo, Akihito Tsubota
OBJECTIVE: To assess the usefulness of C-arm cone beam computed tomography (CBCT) combined with ultrasound for the treatment of hepatocellular carcinoma (HCC) by radiofrequency ablation (RFA). METHODS: Patients underwent RFA following transcatheter arterial chemoembolization (TACE) or RFA alone under ultrasound or CBCT guidance combined with ultrasound-based techniques. They were divided into 2 groups based on the use (C group) and nonuse (NC group) of CBCT guidance...
January 5, 2017: Oncology
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