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https://www.readbyqxmd.com/read/29151568/a-comparison-of-the-mini-open-wiltse-approach-with-pedicle-screw-fixation-and-the-percutaneous-pedicle-screw-fixation-for-neurologically-intact-thoracolumbar-fractures
#1
Yong Fan, JiaNan Zhang, Xin He, YunFei Huang, QiNing Wu, DingJun Hao
BACKGROUND The thoracolumbar AO type A3 fracture is an incomplete burst fracture, which affects one vertebral body endplate. The objective of this study was to determine which of two minimal invasive techniques was more suitable for A3 fractures based on clinical and radiographic results. MATERIAL AND METHODS We studied 112 patients with A3 subtype fractures without neurological deficits. A total of 63 patients received percutaneous pedicle screw fixation (PPSF), and 49 patients were treated using mini-open Wiltse approach with pedicle screw fixation (MWPSF)...
November 20, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29136218/measurement-of-radiation-doses-to-the-eye-lens-during-orthopedic-surgery-using-an-c-arm-x-ray-system
#2
Akira Suzuki, Kosuke Matsubara, Yuko Sasa
The present study aimed to determine doses delivered to the eye lenses of surgeons while using the inverted-C-arm technique and the protective effect of leaded spectacles during orthopedic surgery. The kerma in air was measured at five positions on leaded glasses positioned near the eye lens and on the neck using small optically stimulated luminescence (OSL) dosemeters. The lens equivalent dose was also measured at the neck using an OSL dosemeter. The maximum equivalent dose to the eye lens and the maximum kerma were 0...
November 10, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29128920/prospective-evaluation-of-mr-overlay-on-real-time-fluoroscopy-for-percutaneous-extremity-biopsies-of-bone-lesions-visible-on-mri-but-not-on-ct-in-children-in-the-interventional-radiology-suite
#3
REVIEW
Sphoorti Shellikeri, Randolph M Setser, Seth Vatsky, Abhay Srinivasan, Ganesh Krishnamurthy, Xiaowei Zhu, Marc S Keller, Anne Marie Cahill
Magnetic resonance imaging (MRI) often provides better visualization of bone marrow abnormalities than computed tomography (CT) or fluoroscopy, but bone biopsies are usually performed using conventional CT or, more recently, C-arm CT guidance. Biopsies of bone lesions solely visible on MRI are often challenging to localize and require the operator to review the MRI on a separate console to correlate with MRI anatomical landmarks during the biopsy. The MR overlay technique facilitates such biopsies in the angiographic suite by allowing the pre-procedural 3-D MRI to be overlaid on intraprocedural 2-D fluoroscopy...
November 12, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/29124339/accuracy-of-screw-fixation-using-the-o-arm-%C3%A2-and-stealthstation-%C3%A2-navigation-system-for-unstable-pelvic-ring-fractures
#4
Jun Takeba, Kensuke Umakoshi, Satoshi Kikuchi, Hironori Matsumoto, Suguru Annen, Naoki Moriyama, Yuki Nakabayashi, Norio Sato, Mayuki Aibiki
PURPOSE: Screw fixation for unstable pelvic ring fractures is generally performed using the C-arm. However, some studies reported erroneous piercing with screws, nerve injuries, and vessel injuries. Recent studies have reported the efficacy of screw fixations using navigation systems. The purpose of this retrospective study was to investigate the accuracy of screw fixation using the O-arm(®) imaging system and StealthStation(®) navigation system for unstable pelvic ring fractures. METHODS: The participants were 10 patients with unstable pelvic ring fractures, who underwent screw fixations using the O-arm StealthStation navigation system (nine cases with iliosacral screw and one case with lateral compression screw)...
November 9, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/29122421/evaluating-strategies-for-reducing-scattered-radiation-in-fixed-imaging-hybrid-operating-suites
#5
Claire Miller, Daniel Kendrick, Andrew Shevitz, Ann Kim, Henry Baele, David Jordan, Vikram S Kashyap
OBJECTIVE: High-resolution fixed C-arm fluoroscopic systems allow high-quality endovascular imaging but come at a cost of greater scatter radiation generation and increased occupational exposure for surgeons. The purpose of this study was to evaluate the efficacy of two methods in reducing scattered radiation exposure. METHODS: There were 164 endovascular cases analyzed in three phases. In phase 1 (P1), baseline radiation exposure was calculated. In phase 2 (P2), staff used real-time radiation dose monitoring (dosimetry badges [RaySafe; Unfors, Hopkinton, Mass])...
November 6, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/29122127/fluoroscopic-iliosacral-screw-placement-made-safe
#6
Nadomir Gusic, Igor Grgorinic, Ivica Fedel, Domagoj Lemac, Nado Bukvic, Matko Gusic, Tedi Cicvaric, Zvonimir Lovric
AIM: Unstable posterior pelvic ring injuries should be stabilised successfully by percutaneous iliosacral screwing. The intervention takes place under intraoperative fluoroscopic guidance. The inlet and outlet views are crucial and are performed by tilting the image intensifier. Safely interpreting fluoroscopic views can be challenging in certain clinical scenarios. We demonstrated on a series of patients howpreoperative CT scans can be used to anticipate the appropriate intraoperative inlet and outlet fluoroscopic views and positioning of the patient on the operating table, thereby avoiding possible operating table obstacles...
November 2017: Injury
https://www.readbyqxmd.com/read/29122122/scaphoid-screw-placement-under-minimal-radiation-exposure
#7
Gloria M Hohenberger, Uldis Berzins, Bore Bakota, Patrick Holweg, Bernhard Clement, Stephan Grechenig
BACKGROUND: Percutaneous scaphoid fixation through either a volar or dorsal approach has the advantage of minor soft tissue damage compared with ORIF, and faster fracture union compared with conservative treatment. However, this technique demands highly intraoperative reliance on X-ray control, including increased radiation exposure and all associated side effects. PURPOSE: To test the possibility and efficacy of volar percutaneous scaphoid screw placement under minimalradiation exposure...
November 2017: Injury
https://www.readbyqxmd.com/read/29116058/a-line-fiducial-method-for-geometric-calibration-of-cone-beam-ct-systems-with-diverse-scan-trajectories
#8
Matthew W Jacobson, Michael Daniel Ketcha, Sarah Capostagno, Alexander Martin, Ali Uneri, Joseph Goerres, Tharindu De Silva, Sureerat Reaungamornrat, Runze Han, Amir Manbachi, Joseph Webster Stayman, Sebastian Vogt, Gerhard Kleinszig, Jeffrey H Siewerdsen
Modern cone-beam CT systems, especially C-arms, are capable of diverse source-detector orbits. However, geometric calibration of these systems using conventional configurations of spherical fiducials (BBs) may be challenged for novel source-detector orbits and system geometries. In part, this is because the BB configurations are designed with careful forethought regarding the intended orbit so that BB marker projections do not overlap in projection views. Examples include helical arrangements of BBs (Rougee et al Proc...
November 8, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29097444/razor-a-phase-ii-open-randomized-trial-of-screening-plus-goserelin-and-raloxifene-versus-screening-alone-in-pre-menopausal-women-at-increased-risk-of-breast-cancer
#9
Anthony Howell, Linda Ashcroft, Lesley Fallowfield, Diana M Eccles, Rosalind A Eeles, Ann Ward, Adam R Brentnall, Mitchell Dowsett, Jack M Cuzick, Rosemary Greenhalgh, Caroline Boggis, Jamie Motion, Jamie C Sergeant, Judith Adams, D Gareth R Evans
BACKGROUND: Ovarian suppression in premenopausal women is known to reduce breast cancer risk. This study aimed to assess uptake and compliance with ovarian suppression using the LHRH analogue, goserelin, with add-back raloxifene, as a potential regimen for breast cancer prevention. METHODS: Women at ≥30% lifetime risk breast cancer were approached and randomized to mammographic screening alone(C-Control) or screening in addition to monthly subcutaneous injections of 3...
November 2, 2017: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/29082218/evaluation-of-radiation-exposure-pattern-and-radiation-absorbed-dose-resulting-from-occupational-exposure-of-anesthesiologists-to-ionizing-radiation
#10
B Maghsoudi, S M J Mortazavi, S Khademi, P Vatankhah
INTRODUCTION: Little information is available concerning the radiation exposure of anesthesiologists, and no such data have previously been collected in Iran. This prospective study was performed to determine the amount of radiation exposure of anesthesiologists for the purpose of assessing whether or not dangerous levels of radiation exposures were being reached, and to identify factors that correlate with excessive risk. PARTICIPANTS AND METHODS: The radiation exposure of all anesthesiology residents and the attending of Shiraz University of Medical Sciences during a 3-month period (from June to August 2016) was measured using a film badge with monthly readings...
September 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/29057776/reduction-method-of-operator-and-medical-staff-radiation-exposure-in-balloon-pulmonary-angioplasty-for-chronic-thromboembolic-pulmonary-hypertension
#11
Hitoshi Miyazaki, Yoshiyuki Umezu, Kaede Sato, Kazuhisa Ogawa, Hiroshi Akamine
The purpose of this study is to investigate a reduction method of radiation exposure for operator and medical staff in balloon pulmonary angioplasty (BPA) for chronic thromboembolic pulmonary hypertension (CTEPH). We devised a new radiation protection, which is U-shaped acrylic supporting table with 0.35 mmPb unleaded radiation protection sheet. A human phantom was put on the bed of cardiac angiography system [C-arm angulation: posteroanterior (PA), L-arm angulation: left anterior oblique (LAO) 60°]. The ambient equivalent dose rate was measured under fluoroscopy with and without three radiation protections: U-shaped acrylic supporting table with 0...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/29052249/image-noise-reduction-technology-allows-significant-reduction-of-radiation-dosage-in-cardiac-device-implantation-procedures
#12
Rainer Hoffmann, Lukas Langenbrink, Doris Reimann, Mirlind Kastrati, Michael Becker, Michal Piatkowski, Jochen Michaelsen
BACKGROUND: Novel X-ray systems with real-time image noise reduction technology (INRT) to reduce radiation dose during fluoroscopy and cine acquisition have become available. This study evaluated the reduction of radiation dose in device implantation with INRT. METHODS: Radiation dose data from 132 consecutive new device implantation procedures (102 pacemaker (PM) or implantable cardioverter defibrillator (ICD) and 30 cardiac resynchronization therapy (CRT) devices) performed between 1-2015 and 12-2015 on an angiography system with INRT (Allura ClarityIQ) were collected...
October 20, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29049266/the-cost-and-utility-of-postreduction-radiographs-after-closed-reduction-of-pediatric-wrist-and-forearm-fractures
#13
Avi D Goodman, Mark Zonfrillo, Daniel Chiou, Craig P Eberson, Aristides I Cruz
BACKGROUND: Formal radiographs are frequently obtained after reduction of closed pediatric wrist and forearm fracture performed under mini C-arm fluoroscopy. However, their utility has not been clearly demonstrated to justify the increased time, cost, and radiation exposure. We hypothesized that formal postreduction radiographs do not affect the rereduction rate of pediatric wrist and forearm fractures. We further sought to determine the time, monetary, and opportunity costs associated with obtaining these radiographs...
October 18, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/29039259/single-camera-visual-odometry-to-track-a-surgical-x-ray-c-arm-base
#14
Hooman Esfandiari, Derek Lichti, Carolyn Anglin
This study provides a framework for a single-camera odometry system for localizing a surgical C-arm base. An application-specific monocular visual odometry system (a downward-looking consumer-grade camera rigidly attached to the C-arm base) is proposed in this research. The cumulative dead-reckoning estimation of the base is extracted based on frame-to-frame homography estimation. Optical-flow results are utilized to feed the odometry. Online positional and orientation parameters are then reported. Positional accuracy of better than 2% (of the total traveled distance) for most of the cases and 4% for all the cases studied and angular accuracy of better than 2% (of absolute cumulative changes in orientation) were achieved with this method...
October 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29035938/percutaneous-excision-of-difficult-osteoid-osteomas-using-intraoperative-airo-ct-navigation-a-preliminary-report
#15
Venkatadass Krishnamoorthy, Shanmuganathan Rajasekaran
Osteoid osteomas are well known for intraoperative technical difficulties for localization and adequate excision, especially when they are not clearly visualized on plain radiographs or when they occur in difficult and inaccessible situations. Localization in the radiology suite and shifting the patient to the operating room can be cumbersome, and can result in errors because of lack of real-time imaging. In these scenarios, intraoperative navigation will be useful. We report a technique of intraoperative computed tomography (CT) navigation for localization and excision of osteoid osteomas of the long bones...
October 13, 2017: Journal of Pediatric Orthopedics. Part B
https://www.readbyqxmd.com/read/29027895/changes-in-foraminal-area-with-anterior-decompression-versus-keyhole-foraminotomy-in-the-cervical-spine-a-biomechanical-investigation
#16
Jacqueline Nguyen, Bryant Chu, Calvin C Kuo, Jeremi M Leasure, Christopher Ames, Dimitriy Kondrashov
OBJECTIVE Anterior cervical discectomy and fusion (ACDF) with or without partial uncovertebral joint resection (UVR) and posterior keyhole foraminotomy are established operative procedures to treat cervical disc degeneration and radiculopathy. Studies have demonstrated reliable results with each procedure, but none have compared the change in neuroforaminal area between indirect and direct decompression techniques. The purpose of this study was to determine which cervical decompression method most consistently increases neuroforaminal area and how that area is affected by neck position...
October 13, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/29021314/augmented-3d-venous-navigation-for-neuroendovascular-procedures
#17
Raphaël Blanc, Robert Fahed, Pascal Roux, Stanislas Smajda, Gabriele Ciccio, Jean-Philippe Desilles, Hocine Redjem, Mikael Mazighi, Humain Baharvahdat, Michel Piotin
BACKGROUND: Endovascular venous access is increasingly used for the treatment of many cerebrovascular diseases. The quality of venous roadmapping through arterial injection can be problematic because of contrast media dilution, slow flow velocity, and unilateral opacification of the venous system. OBJECTIVE: To describe our experience with the VesselNavigator (Philips Healthcare, Best, The Netherlands) in performing live 3D roadmapping for intracranial venous procedures...
October 11, 2017: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/28994668/correction-of-patient-motion-in-cone-beam-ct-using-3d-2d-registration
#18
Sarah Ouadah, Matthew W Jacobson, Joseph Webster Stayman, Tina Ehtiati, Clifford Raabe Weiss, Jeffrey H Siewerdsen
Cone-beam CT (CBCT) is increasingly common in guidance of interventional procedures but can be subject to artifacts arising from patient motion during fairly long (~5-60s) scan times. We present a fiducial-free method to mitigate motion artifacts using 3D-2D image registration that simultaneously corrects residual errors in the intrinsic and extrinsic parameters of geometric calibration. The 3D-2D registration process registers each projection to a prior 3D image by maximizing gradient orientation using the covariance matrix adaptation-evolution strategy (CMA-ES) optimizer...
October 10, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28992760/-cochlear-view-plain-radiograph-a-simple-reliable-positioning-method
#19
Stephanie Elyse Ambrose, Norman Wendell Todd
INTRODUCTION: The plain 'cochlear view' radiograph for checking cochlear implant electrode coiling and depth of insertion is strongly influenced by positioning. The best accuracy and inter-observer agreement are achieved with the X-ray beam passing through the axis of the modiolus, which is perpendicular to the plane of the basal turn of the cochlea. The basal turn of the cochlea generally is 45 from the head's sagittal plane. OBJECTIVE: To describe a simple reliable technique of patient positioning to maximize the accuracy of postoperative radiographs in the evaluation of cochlear electrode insertion...
October 10, 2017: Cochlear Implants International
https://www.readbyqxmd.com/read/28989845/comparison-perioperative-factors-during-minimally-invasive-pre-psoas-lateral-interbody-fusion-of-the-lumbar-spine-using-either-navigation-or-conventional-fluoroscopy
#20
Yue-Hui Zhang, Ian White, Eric Potts, Jean-Pierre Mobasser, Dean Chou
STUDY DESIGN: Retrospective clinical study. OBJECTIVES: The aim of this study was to compare intraoperative conditions and clinical results of patients undergoing pre-psoas oblique lateral interbody fusion (OLIF) using navigation or conventional fluoroscopy (C-ARM) techniques. METHODS: Forty-two patients (22 patients by navigation and 20 by fluoroscopy) underwent the OLIF procedure at 2 medical centers, and records were reviewed. Clinical data was collected and compared between the 2 groups...
October 2017: Global Spine Journal
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