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https://www.readbyqxmd.com/read/28324213/-split-and-splayed-c3-traumatic-lateral-c2-3-dislocation-without-neurological-deficits-unique-case-and-its-management
#1
Apinderpreeet Singh, Pravin Salunke, Rajeev P Kamble
BACKGROUND: Traumatic C2-3 dislocation has been often described in the antero-posterior plane but is extremely rare in the lateral plane. Such dislocations have been described in thoraco-lumbar and C1-2. The need to study the imaging in multiple planes has been highlighted to plan proper realignment. METHODS: A young male presented with neck pain alone following a train accident. The imaging showed a fracture of C3 splaying it. The C2-3 showed lateral dislocation in the lateral plane with locked C2-3 facets on one side and C3-4 facets on the other...
May 2017: European Spine Journal
https://www.readbyqxmd.com/read/28267550/a-correlative-study-of-aortic-valve-rotation-angle-and-thoracic-aortic-sizes-using-ecg-gated-ct-angiography
#2
Farhood Saremi, Steven Cen, Nazila Tayari, Houman Alizadeh, Amir Emami, Leah Lin, Fernando Fleischman
OBJECTIVE: Various degrees of aortic valve rotation may be seen in individuals with no history of congenital cardiovascular malformations, but its association with aortic sizes has not been studied. METHODS: Gated computed tomographic (CT angiograms in 217 patients were studied (66.7±15; 22-97 years old)). Aortic diameters were determined at 5 anatomic locations. The length of the aorta from sinus to left subclavian artery was measured. The angle of valve rotation was recorded by measuring the angle between a line connecting the midpoint of the non-coronary sinus to the anterior commissure and another line along the interatrial septum...
April 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28249308/smartphone-as-a-remote-touchpad-to-facilitate-visualization-of-3d-cerebral-angiograms-during-aneurysm-surgery
#3
Behzad Eftekhar
Background During aneurysm surgery, neurosurgeons may need to look at the cerebral angiograms again to better orient themselves to the aneurysm and also the surrounding vascular anatomy. Simplification of the intraoperative imaging review and reduction of the time interval between the view under the microscope and the angiogram review can theoretically improve orientation. Objective To describe the use of a smartphone as a remote touchpad to simplify intraoperative visualization of three-dimensional (3D) cerebral angiograms and reduce the time interval between the view under the microscope and the angiogram review...
September 2017: Journal of Neurological Surgery. Part A, Central European Neurosurgery
https://www.readbyqxmd.com/read/28097212/feasibility-of-reduced-dose-three-dimensional-four-dimensional-digital-subtraction-angiogram-using-a-weighted-edge-preserving-filter
#4
Erick L Oberstar, Michael A Speidel, Brian J Davis, Charles M Strother, Charles A Mistretta
A conventional three-dimensional/four-dimensional (3D/4D) digital subtraction angiogram (DSA) requires two rotational acquisitions (mask and fill) to compute the log-subtracted projections that are used to reconstruct a 3D/4D volume. Since all of the vascular information is contained in the fill acquisition, it is hypothesized that it is possible to reduce the x-ray dose of the mask acquisition substantially and still obtain subtracted projections adequate to reconstruct a 3D/4D volume with noise level comparable to a full-dose acquisition...
January 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28047848/tu-h-campus-iep2-02-four-dimensional-coronary-artery-visualization-based-on-image-propagation
#5
B Liu, B Liang, X Xu, B Guo, R Wei, S Xu, F Zhou, Q Wu
PURPOSE: 4D visualization of coronary artery using X-ray angiograms rotationally acquired on C-arm has many valuable applications, like dynamic roadmapping. In this work we propose and validate a method to visualize 4D artery based on 3D coronary image propagation. METHODS: After sorting the angiograms into different cardiac phases using nearest-neighbor ECG gating, a high quality 3D coronary image was reconstructed at one phase using a motion-compensated iterative reconstruction method...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28045690/clinical-case-of-the-month-a-49-year-old-man-who-presents-with-left-sided-weakness-an-update-on-ischemic-stroke
#6
Najy Masri, Rikki Weems, Falon Brown, Ben Andres, Fred Lopez
A 49 year-old man with a past medical history significant for essential hypertension, hyperlipidemia, and coronary artery disease status post percutaneous coronary intervention and stent placement in the right coronary artery in 2010 presented for evaluation of left hemiplegia. He was feeling well until three hours prior to presentation, at which time he fell while walking from his bedroom into the kitchen. After falling, he noticed that his left upper and lower extremities felt weak. He denied any symptoms preceding the fall or any loss of consciousness...
November 2016: Journal of the Louisiana State Medical Society: Official Organ of the Louisiana State Medical Society
https://www.readbyqxmd.com/read/28018741/local-motion-compensated-method-for-high-quality-3d-coronary-artery-reconstruction
#7
Bo Liu, Xiangzhi Bai, Fugen Zhou
The 3D reconstruction of coronary artery from X-ray angiograms rotationally acquired on C-arm has great clinical value. While cardiac-gated reconstruction has shown promising results, it suffers from the problem of residual motion. This work proposed a new local motion-compensated reconstruction method to handle this issue. An initial image was firstly reconstructed using a regularized iterative reconstruction method. Then a 3D/2D registration method was proposed to estimate the residual vessel motion. Finally, the residual motion was compensated in the final reconstruction using the extended iterative reconstruction method...
December 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27644405/left-ventricular-torsion-and-circumferential-strain-responses-to-exercise-in-patients-with-ischemic-coronary-artery-disease
#8
Jesus Peteiro, Alberto Bouzas-Mosquera, Javier Broullon, Gabriel Sanchez-Fernandez, Cayetana Barbeito, Lucia Perez-Cebey, Dolores Martinez, Jose M Vazquez-Rodriguez
LV torsion during exercise in patients with coronary artery disease (CAD) is not well known. Circumferential strain (CS) and left ventricular (LV) torsion (Tor) have not been evaluated during ischemia in these patients. We aimed to assess the effect of ischemia during exercise echocardiography (ExE) on CS and Tor. We studied a group of 73 patients with true positive ExE results (Ischemic group: ischemia plus an abnormal coronary angiogram) and a matched control group of 66 patients with negative ExE and either normal coronary angiography or low post-test probability of CAD...
January 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/27633810/does-arterial-flow-rate-affect-the-assessment-of-flow-diverter-stent-performance
#9
H G Morales, O Bonnefous, A J Geers, O Brina, V M Pereira, L Spelle, J Moret, I Larrabide
BACKGROUND AND PURPOSE: Our aim was to assess the performance of flow-diverter stents. The pre- and end-of-treatment angiographies are commonly compared. However, the arterial flow rate may change between acquisitions; therefore, a better understanding of its influence on the local intra-aneurysmal hemodynamics before and after flow-diverter stent use is required. MATERIALS AND METHODS: Twenty-five image-based aneurysm models extracted from 3D rotational angiograms were conditioned for computational fluid dynamics simulations...
December 2016: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/27416860/stereolithographic-models-in-the-interdisciplinary-planning-of-treatment-for-complex-intracranial-aneurysms
#10
Lukas Andereggen, Jan Gralla, Robert H Andres, Stefan Weber, Gerhard Schroth, Jürgen Beck, Hans Rudolf Widmer, Michael Reinert, Andreas Raabe, Matthias Peterhans
BACKGROUND: Treatment of complex intracranial aneurysms requires strategic pre-interventional or preoperative planning. In addition to modern three-dimensional (3D) rotational angiography, computed tomography angiography (CTA) or magnetic resonance angiogram (MRA), a solid, tangible 3D model may improve anatomical comprehension and treatment planning. A 3D rapid prototyping (RP) technique based on multimodal imaging data was evaluated for use in planning of treatment for complex aneurysmal configurations...
September 2016: Acta Neurochirurgica
https://www.readbyqxmd.com/read/27115377/association-between-rotating-night-shift-work-and-risk-of-coronary-heart-disease-among-women
#11
Céline Vetter, Elizabeth E Devore, Lani R Wegrzyn, Jennifer Massa, Frank E Speizer, Ichiro Kawachi, Bernard Rosner, Meir J Stampfer, Eva S Schernhammer
IMPORTANCE: Prospective studies linking shift work to coronary heart disease (CHD) have been inconsistent and limited by short follow-up. OBJECTIVE: To determine whether rotating night shift work is associated with CHD risk. DESIGN, SETTING, AND PARTICIPANTS: Prospective cohort study of 189,158 initially healthy women followed up over 24 years in the Nurses' Health Studies (NHS [1988-2012]: N = 73,623 and NHS2 [1989-2013]: N = 115,535)...
April 26, 2016: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/27079433/radiation-protocol-for-three-dimensional-rotational-angiography-to-limit-procedural-radiation-exposure-in-the-pediatric-cardiac-catheterization-lab
#12
COMPARATIVE STUDY
Lauren Haddad, B Rush Waller, Jason Johnson, Asim Choudhri, Vera McGhee, David Zurakowski, Andrew Kuhls-Gilcrist, Shyam Sathanandam
BACKGROUND: Three-dimensional rotational angiography (3DRA) offers more detailed anatomic information than 2D digital acquisition (2DDA). Concerns over potentially higher contrast and radiation doses have limited its routine use. OBJECTIVE: The primary objective of this study was to compare radiation doses required to obtain 3DRA using a customized low dose radiation protocol with 2DDA. The secondary objective was to compare total procedural radiation in pediatric cardiac catheterization procedures utilizing 3DRA to those that do not...
December 2016: Congenital Heart Disease
https://www.readbyqxmd.com/read/27017497/patient-individualized-boundary-conditions-for-cfd-simulations-using-time-resolved-3d-angiography
#13
Marco Boegel, Sonja Gehrisch, Thomas Redel, Christopher Rohkohl, Philip Hoelter, Arnd Doerfler, Andreas Maier, Markus Kowarschik
PURPOSE: Hemodynamic simulations are of increasing interest for the assessment of aneurysmal rupture risk and treatment planning. Achievement of accurate simulation results requires the usage of several patient-individual boundary conditions, such as a geometric model of the vasculature but also individualized inflow conditions. METHODS: We propose the automatic estimation of various parameters for boundary conditions for computational fluid dynamics (CFD) based on a single 3D rotational angiography scan, also showing contrast agent inflow...
June 2016: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/26574481/two-color-3d-3d-fusion-of-selective-rotational-cerebral-angiograms-a-novel-approach-to-imaging-in-cerebrovascular-neurosurgery
#14
Ali Jalali, Visish M Srinivasan, Ponraj Chinnadurai, Peter Kan, Adam Arthur, Edward A M Duckworth
BACKGROUND: Since its introduction, digital subtraction angiography has been considered the gold standard in diagnostic imaging for neurovascular disease. Modern post-processing techniques have made angiography even more informative to the cerebrovascular neurosurgeon or neurointerventionalist. Open neurosurgical procedures such as aneurysm clipping, extirpation of arteriovenous malformations, and extracranial-intracranial bypass remain important techniques in the armamentarium of a comprehensive cerebrovascular neurosurgeon...
October 2016: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/26509644/the-lurking-catastrophic-complication-of-an-equally-catastrophic-disease-the-lesson-learned
#15
Santhosh Kannath, Enakshy Rajan Jayadevan
BACKGROUND: Medullary-bridging vein dural arteriovenous fistula (DAVF) is an uncommon type of DAVF with an aggressive clinical course due to direct fistulous shunting into medullary and brainstem veins. Important considerations need to be given to retrograde embolic migration or perforator involvement while treating these fistulas endovascularly with a liquid embolic agent. We report a lateral spinal artery feeding the DAVF, the recognition of which is important to avoid potential catastrophic complications during definitive therapy, and which has not been described before...
October 27, 2015: Neurosurgery
https://www.readbyqxmd.com/read/26495192/haptics-assisted-virtual-planning-of-bone-soft-tissue-and-vessels-in-fibula-osteocutaneous-free-flaps
#16
Pontus Olsson, Fredrik Nysjö, Andrés Rodríguez-Lorenzo, Andreas Thor, Jan-Michaél Hirsch, Ingrid B Carlbom
UNLABELLED: Virtual surgery planning has proven useful for reconstructing head and neck defects by fibula osteocutaneous free flaps (FOFF). Benefits include improved healing, function, and aesthetics, as well as cost savings. But available virtual surgery planning systems incorporating fibula in craniomaxillofacial reconstruction simulate only bone reconstruction without considering vessels and soft tissue. METHODS: The Haptics-Assisted Surgery Planning (HASP) system incorporates bone, vessels, and soft tissue of the FOFF in craniomaxillofacial defect reconstruction...
August 2015: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/26487972/surgical-decompression-coupled-with-diagnostic-dynamic-intraoperative-angiography-for-bow-hunter-s-syndrome
#17
Ha Son Nguyen, Ninh Doan, Gerald Eckardt, Glen Pollock
BACKGROUND: Bow hunter's syndrome, also known as rotational vertebrobasilar insufficiency, arises from mechanical compression of the vertebral artery during the neck rotation. Surgical options have been the mainstay treatment of choice. Postoperative imaging is typically used to assess adequate decompression. On the other hand, intraoperative assessment of decompression has been rarely reported. CASE DESCRIPTION: A 52-year-old male began to see "black spots," and experienced presyncope whenever he rotated his head toward the right...
2015: Surgical Neurology International
https://www.readbyqxmd.com/read/26453606/measurement-in-the-angiography-suite-evaluation-of-vessel-sizing-techniques
#18
Pengfei Yang, Sebastian Schafer, Kevin Royalty, Azam Ahmed, David Niemann, Charles Strother
BACKGROUND: Accurate vessel size measurement is important for neurointervention. Modern angiographic equipment offers various two-dimensional (2D) and 3D measurement methods that have not been systematically evaluated for accuracy and reliability. OBJECTIVE: To evaluate these methods using anthropomorphic vessel phantoms. MATERIALS AND METHODS: Tubing of known sizes (2-5 mm, 1 mm increments) was embedded in 3D-printed skulls to simulate the middle cerebral artery, internal carotid artery, and basilar artery...
September 2016: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/26256704/value-of-c-arm-cone-beam-computed-tomography-image-fusion-in-maximizing-the-versatility-of-endovascular-robotics
#19
Ponraj Chinnadurai, Cassidy Duran, Odeaa Al-Jabbari, Walid K Abu Saleh, Alan Lumsden, Jean Bismuth
BACKGROUND: To report our initial experience and highlight the value of using intraoperative C-arm cone beam computed tomography (CT; DynaCT(®)) image fusion guidance along with steerable robotic endovascular catheter navigation to optimize vessel cannulation. METHODS: Between May 2013 and January 2015, all patients who underwent endovascular procedures using DynaCT image fusion technique along with Hansen Magellan vascular robotic catheter were included in this study...
January 2016: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/26053811/risk-stratification-of-vertebral-artery-vulnerability-during-surgery-for-congenital-atlanto-axial-dislocation-with-or-without-an-occipitalized-atlas
#20
Jayesh Sardhara, Sanjay Behari, B Madan Mohan, Awadhesh K Jaiswal, Rabi N Sahu, Arun Srivastava, Anant Mehrotra, Hira Lal
CONTEXT: Variability in dimensions and course of vertebral artery (VA) makes it vulnerable to injury during surgery for congenital atlanto-axial dislocation (AAD) with or without an occipitalized atlas. AIMS: This prospective study attempts to define anatomical variations that render VA at the craniovertebral junction (CVJ) vulnerable to injury during transoral decompression and posterior stabilization procedures; and, to propose a classification that helps in preoperative risk stratification...
May 2015: Neurology India
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