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Conebeam OR dynaCT OR rotational angiogram

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
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
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
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
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...
September 19, 2016: International Journal of Cardiovascular Imaging
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
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
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
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
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
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
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
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
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
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
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
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
Anna L Hoppe, Madhavan L Raghavan, David M Hasan
BACKGROUND AND PURPOSE: In recurrent cerebral aneurysms treated by coil embolization, coil compaction is regarded as the presumptive mechanism. We test the hypothesis that aneurysm growth is the primary recurrence mechanism. We also test the hypothesis that the coil mass will translate a measurable extent when recurrence occurs. METHODS: An objective, quantitative image analysis protocol was developed to determine the volumes of aneurysms and coil masses during initial and follow-up visits from 3D rotational angiograms...
2015: PloS One
Katsunari Namba, Ayuho Higaki, Naoki Kaneko, Toshihiro Mashiko, Shigeru Nemoto, Eiju Watanabe
OBJECTIVE: An optimal microcatheter is necessary for successful coiling of an intracranial aneurysm. The optimal shape may be predetermined before the endovascular surgery via the use of a 3-dimensional (3D) printing rapid prototyping technology. We report a preliminary series of intracranial aneurysms treated with a microcatheter shape determined by the patient's anatomy and configuration of the aneurysm, which was fabricated with a 3D printer aneurysm model. METHODS: A solid aneurysm model was fabricated with a 3D printer based on the data acquired from the 3D rotational angiogram...
July 2015: World Neurosurgery
Thomas Westermaier, Thomas Linsenmann, Almuth F Keßler, Christian Stetter, Nadine Willner, Laszlo Solymosi, Ralf-Ingo Ernestus, Giles H Vince
BACKGROUND: Intraoperative imaging of cerebral aneurysms may be desirable in emergency situations with large space-occupying hematomas or to visualize vessels after clip placement. Mobile 3-dimensional fluoroscopes are available in a number of neurosurgical departments and may be useful in combination with simple image postprocessing to depict cerebral vessels. OBJECTIVE: To assess whether intracranial aneurysms are detectable with appropriate image quality with intraoperative 3-dimensional fluoroscopy with intravenous contrast administration...
March 2015: Neurosurgery
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