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https://www.readbyqxmd.com/read/28325434/radiation-exposure-and-the-orthopedic-surgeon-s-hand-measurement-of-the-equivalent-dose-over-13%C3%A2-months
#1
F Loisel, G Menu, E Boyer, I Pluvy, L Obert
Exposure to ionizing radiation in the operating room is governed by practical prevention and protection measures on the international, national and local levels. We evaluated the equivalent dose to the hand of an orthopedic surgeon over 13 months. An orthopedic surgeon wore a ring dosimeter on the ring finger of his right hand for all surgical procedures requiring intraoperative fluoroscopy between March 2014 and April 2015. Monthly doses were evaluated by the IRSN over the study period. The number and type of procedures were compiled as well as the type of fluoroscopy unit used...
April 2017: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/28306699/dynamic-measurement-of-arterial-liver-perfusion-with-an-interventional-c-arm-system
#2
Sanjit Datta, Kerstin Müller, Terilyn Moore, Lior Molvin, Sonja Gehrisch, Jarrett Rosenberg, Yamil Saenz, Michael Manhart, Yu Deuerling-Zheng, Nishita Kothary, Rebecca Fahrig
PURPOSE: Objective intraprocedural measurement of hepatic blood flow could provide a quantitative treatment end point for locoregional liver procedures. This study aims to validate the accuracy and reproducibility of cone-beam computed tomography perfusion (CBCTp) measurements of arterial liver perfusion (ALP) against clinically available computed tomography perfusion (CTp) measurements in a swine embolization model. METHODS: Triplicate CBCTp measurements using a selective arterial contrast injection were performed before and after complete embolization of the left lobe of the liver in 5 swine...
March 17, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28304221/fluoroscopy-time-is-not-accurate-as-a-surrogate-for-radiation-exposure
#3
Edvard Skripochnik, Shang A Loh
Objective The Food and Drug Administration and the Vascular Quality Initiative still utilize fluoroscopy time as a surrogate marker for procedural radiation exposure. This study demonstrates that fluoroscopy time does not accurately represent radiation exposure and that dose area product and air kerma are more appropriate measures. Methods Lower extremity endovascular interventions ( N = 145) between 2013 and 2015 performed at an academic medical center on a Siemens Artis-Zee floor mounted c-arm were identified...
January 1, 2017: Vascular
https://www.readbyqxmd.com/read/28300387/real-time-ray-casting-based-scatter-dose-estimation-for-c-arm-x-ray-system
#4
Zaid Alnewaini, Eric Langer, Philipp Schaber, Matthias David, Dominik Kretz, Volker Steil, Jürgen Hesser
OBJECTIVES: Dosimetric control of staff exposure during interventional procedures under fluoroscopy is of high relevance. In this paper, a novel ray casting approximation of radiation transport is presented and the potential and limitation vs. a full Monte Carlo transport and dose measurements are discussed. METHOD: The x-ray source of a Siemens Axiom Artix C-arm is modeled by a virtual source model using single Gaussian-shaped source. A Geant4-based Monte Carlo simulation determines the radiation transport from the source to compute scatter from the patient, the table, the ceiling and the floor...
March 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28299274/bullet-removal-from-the-infratemporal-fossa
#5
Ahmed Maki Merza
War injuries are the cornerstone of maxillofacial surgery, and it led to the initiation and development of this specialty, and each case represents a challenge to the surgeon who deals with it. In this article, we present a 30-year-old male patient who was referred to our emergency department complaining of gunshot wound, severe pain, and limitation in mouth opening. Preoperative imaging showed a bullet with a very long path lodged in the infratemporal fossa. Three different approaches with the aid of C-arm imaging system were used for the removal of this bullet; the last approach was the successful one...
July 2016: Annals of Maxillofacial Surgery
https://www.readbyqxmd.com/read/28296305/on-flattening-filter-free-portal-dosimetry
#6
Eduardo Pardo, Juan Castro Novais, María Yolanda Molina López, Sheila Ruiz Maqueda
Varian introduced (in 2010) the option of removing the flattening filter (FF) in their C-Arm linacs for intensity-modulated treatments. This mode, called flattening filter-free (FFF), offers the advantage of a greater dose rate. Varian's "Portal Dosimetry" is an electronic portal imager device (EPID)-based tool for IMRT verification. This tool lacks the capability of verifying flattening filter-free (FFF) modes due to saturation and lack of an image prediction algorithm. (Note: the latest versions of this software and EPID correct these issues...
July 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28291184/lateral-radiographic-landmarks-for-acl-and-lcl-footprint-origins-during-all-epiphyseal-femoral-drilling-in-skeletally-immature-knees
#7
Kevin G Shea, Peter C Cannamela, Peter D Fabricant, E Bailey Terhune, John D Polousky, Matthew D Milewski, Theodore J Ganley, Allen F Anderson
BACKGROUND: This study was conducted to evaluate the spatial relationship of the anterior cruciate ligament (ACL) and lateral collateral ligament (LCL) femoral footprint origins in knee specimens from skeletally immature donors as viewed on lateral radiographs. METHODS: Fourteen cadaver specimens of skeletally immature knees from children between 7 and 11 years old at the time of death were examined through gross dissection. Metallic pins were placed at the center of the ACL and LCL femoral footprints, and computed tomography (CT) scans were performed...
March 15, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28289670/radiation-hazards-to-vascular-surgeon-and-scrub-nurse-in-mobile-fluoroscopy-equipped-hybrid-vascular-room
#8
Jong Bin Kim, Jaehoon Lee, Kihyuk Park
PURPOSE: The aim of the present study was to identify the radiation hazards to vascular surgeons and scrub nurses working in mobile fluoroscopy equipped hybrid vascular operation rooms; additionally, to estimate cumulative cancer risk due to certain exposure dosages. METHODS: The study was conducted prospectively in 71 patients (53 men and 18 women) who had undergone vascular intervention at our hybrid vascular theater for 6 months. OEC 9900 fluoroscopy was used as mobile C-arm...
March 2017: Annals of Surgical Treatment and Research
https://www.readbyqxmd.com/read/28289639/clinical-efficacy-of-selective-focal-ablation-by-navigable-percutaneous-disc-decompression-device-in-patients-with-cervical-herniated-nucleus-pulposus
#9
Sung Hoon Kim, Sang-Heon Lee, Nack Hwan Kim, Min Hyun Kim, Hyeun Jun Park, Yong Jin Jung, Hyun-Joon Yoo, Won Jun Meng, Victoria Kim
OBJECTIVE: To evaluate the clinical efficacy and safety following percutaneous disc decompression, using navigable disc decompression device for cervical herniated nucleus pulposus (HNP). METHODS: Twenty subjects diagnosed with cervical HNP and refractory to conservative management were enrolled for the study. The herniated discs were decompressed under fluoroscopic guidance, using radiofrequency ablation device with navigable wand. The sagittal and axial plain magnetic resonance images of the clinically significant herniated disc, decided the space between the herniated base and outline as the target area for ablation...
February 2017: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/28269200/a-method-for-coronary-bifurcation-centerline-reconstruction-from-angiographic-images-based-on-focalization-optimization
#10
E Montin, S Migliori, C Chiastra, C Credi, R Fedele, C Aurigemma, M Levi, F Burzotta, F Migliavacca, L T Mainardi
A method for the reconstruction of a vessel centerline from angiographic images is outlined in this work. A typical coronary artery segment with bifurcations was emulated with a 3D printed static phantom and several angiograms were acquired at various angular positions on the C-Arm. The effectiveness of the reconstruction turned out to be largely influenced by the intrinsic parameters of the angiographic system, particularly the homogeneous coordinates system scaling factor λ. Therefore, recourse was made to a heuristic optimization method to estimate the optimal value of λ for each view...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269197/inexact-coronary-tree-matching-algorithm-with-artificial-nodes
#11
Helene Feuillatre, Jean-Claude Nunes, Christine Toumoulin
Coronary tree matching is applied to plan percutaneous vascular procedures. This work, which allows following each segment of non-isomorphic coronary trees over time, precedes the determination of the best 2D angiography view from C-arm acquisition system for angioplasty procedure. To match two 3D coronary trees which represent two successive cardiac phases, we adapted a reference inexact tree matching algorithm based on association graph and maximum clique. To improve the pair-wise matching performance of our approach, artificial nodes are introduced to take into account the topology variation between 3D vascular trees...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269128/experimental-evaluation-of-the-accuracy-at-the-c-arm-pose-estimation-with-x-ray-images
#12
Sabine Thurauf, Florian Vogt, Oliver Hornung, Mario Korner, M Ali Nasseri, Alois Knoll
C-arm X-ray systems need a high spatial accuracy for applications like cone beam computed tomography and 2D/3D overlay. One way to achieve the needed precision is a model-based calibration of the C-arm system. For such a calibration a kinematic and dynamic model of the system is constructed whose parameters are computed by pose measurements of the C-arm. Instead of common measurement systems used for a model-based calibration for robots like laser trackers, we use X-ray images of a calibration phantom to measure the C-arm pose...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268411/automatic-lumbar-vertebrae-detection-based-on-feature-fusion-deep-learning-for-partial-occluded-c-arm-x-ray-images
#13
Yang Li, Wei Liang, Yinlong Zhang, Haibo An, Jindong Tan
Automatic and accurate lumbar vertebrae detection is an essential step of image-guided minimally invasive spine surgery (IG-MISS). However, traditional methods still require human intervention due to the similarity of vertebrae, abnormal pathological conditions and uncertain imaging angle. In this paper, we present a novel convolutional neural network (CNN) model to automatically detect lumbar vertebrae for C-arm X-ray images. Training data is augmented by DRR and automatic segmentation of ROI is able to reduce the computational complexity...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28267538/ultra-high-resolution-c-arm-ct-arthrography-of-the-wrist-radiation-dose-and-image-quality-compared-to-conventional-multidetector-computed-tomography
#14
Thomas Werncke, Lena Sonnow, Bernhard C Meyer, Matthias Lüpke, Jan Hinrichs, Frank K Wacker, Christian von Falck
OBJECTIVE: Objective of this phantom and cadaveric study was to compare the effective radiation dose (ED) and image quality (IQ) between C-arm computed tomography (CACT) using an ultra-high resolution 1×1 binning with a standard 16-slice CT (MDCT) arthrography of the wrist. METHODS: ED was determined with thermoluminescence dosimetry using an anthropomorphic phantom and different patient positions. Imaging was conducted in 10 human cadaveric wrists after tri-compartmental injection of diluted iodinated contrast material and a wire phantom...
April 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28261430/assessment-of-anteroposterior-subpedicular-approach-and-oblique-scotty-dog-subpedicular-approach-for-selective-nerve-root-block
#15
Arun-Kumar Kaliya-Perumal, Yu-Cheng Yeh, Chi-An Luo, Kit-Yang Joey-Tan
BACKGROUND: The technique used to administer a selective nerve root block (SNRB) varies depending on individual expertise. Both the anteroposterior (AP) subpedicular approach and oblique Scotty dog subpedicular approach are widely practiced. However, the literature does not provide a clear consensus regarding which approach is more suitable. Hence, we decided to analyse the procedural parameters and clinical outcomes following SNRBs using these two approaches. METHODS: Patients diagnosed with a single lumbar herniated intervertebral disc (HIVD) refractory to conservative management but not willing for immediate surgery were selected for a prospective nonrandomized comparative study...
March 2017: Clinics in Orthopedic Surgery
https://www.readbyqxmd.com/read/28250606/successful-removal-of-foreign-body-bronchus-using-c-arm-guided-insertion-of-fogarty-catheter-through-plastic-bead
#16
Ravindra Ganuji Wankhede, Gaurab Maitra, Subhabrata Pal, Anirban Ghoshal, Soumen Mitra
Foreign body aspiration is still a cause of significant morbidity in children. Complications occur due to difficulty in diagnosis and treatment. An eight-year-old child presented with a history of recurrent cough for 3 days. Rigid bronchoscopy under general anesthesia revealed plastic bead occupying right main bronchus. Removal with grasping forceps failed for several times due to spherical, smooth, and large bead. Finally, Fogarty catheter was passed through bead under C-arm guidance and successfully removed...
February 2017: Indian Journal of Critical Care Medicine
https://www.readbyqxmd.com/read/28244423/real-time-verification-of-a-high-dose-rate-iridium-192-source-position-using-a-modified-c-arm-fluoroscope
#17
Takayuki Nose, Masashi Chatani, Yuki Otani, Teruki Teshima, Shinichirou Kumita
PURPOSE: High-dose-rate (HDR) brachytherapy misdeliveries can occur at any institution, and they can cause disastrous results. Even a patient's death has been reported. Misdeliveries could be avoided with real-time verification methods. In 1996, we developed a modified C-arm fluoroscopic verification of an HDR Iridium 192 source position prevent these misdeliveries. This method provided excellent image quality sufficient to detect errors, and it has been in clinical use at our institutions for 20 years...
March 15, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28243369/a-sternum-disk-distance-method-to-identify-the-skin-level-for-approaching-a-surgical-segment-without-fluoroscopy-guidance-during-anterior-cervical-discectomy-and-fusion
#18
Gun Woo Lee, Myun-Whan Ahn, Ji-Hoon Shin, Jae Woo Park, Jae-Hyung Uh, Jong-Ho Park, Ji-Hoon Lee, Dong-Wook Kim, Jin S Yeom, Bo-Gun Suh
STUDY DESIGN: A retrospective review of prospectively collected data. PURPOSE: To introduce the sternum-disk distance (SDD) method for approaching the exact surgical level without C-arm guidance during anterior cervical discectomy and fusion (ACDF) surgery and to evaluate its accuracy and reliability. OVERVIEW OF LITERATURE: Although spine surgeons have tried to optimize methods for identifying the skin level for accessing the operative disk level without C-arm guidance during ACDF, success has rarely been reported...
February 2017: Asian Spine Journal
https://www.readbyqxmd.com/read/28235517/partial-displacement-of-epidural-catheter-after-patient-position-change-a-case-report
#19
Yoon-Jung Shon, Seung-Kil Bae, Jae-Woo Park, In-Nam Kim, Jin Huh
Epidural catheter migration is a well-known cause of failed anesthesia and complications. One of the factors that affect catheter movement is when patients change their position after skin fixation. We report a case of an epidural catheter placed without evidence of intravascular or subdural insertion that produced an insufficient block. A 36-year-old woman presented for ankle surgery under epidural anesthesia. Epidural block was conducted at the L3-4 intervertebral space with a catheter threaded 3 cm into the epidural space with the patient in a back flexion and lateral position...
February 2017: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/28231555/edge-preserving-denoising-for-intra-operative-cone-beam-ct-in-endovascular-aneurysm-repair
#20
Yi Liu, Miguel Castro, Mathieu Lederlin, Huazhong Shu, Adrien Kaladji, Pascal Haigron
C-arm cone-beam computed tomography (CBCT) acquisition during endovascular aneurysm repair (EVAR) is an emergent technology with more and more applications. It offers real time imaging with a stationary patient and provides 3-D information to achieve guidance of intervention. However, there is growing concern on the overall radiation doses delivered to patients all along the endovascular management due to pre-, intra-, and post-operative X-ray imaging. Manufactures may have their low dose protocols to realize reduction of radiation dose, but CBCT with a low dose protocol has too many artifacts, particularly streak artifacts, and decreased contrast-to-noise ratio (CNR)...
January 30, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
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