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Stereotaxy

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https://www.readbyqxmd.com/read/28927833/modulation-of-hippocampal-activity-with-fornix-deep-brain-stimulation
#1
Paul H Stypulkowski, Scott R Stanslaski, Jonathon E Giftakis
BACKGROUND: Deep Brain Stimulation (DBS) within the Papez circuit is under investigation as a treatment for epilepsy and Alzheimer's disease. We previously reported the effects of stimulation at nodes within this network (anterior thalamic nucleus and hippocampus) on hippocampal activity in a large animal model, using a chronic implantable, clinical-grade system that permits concurrent stimulation and recording. OBJECTIVE: In this study we extended earlier work to compare the effects of fornix DBS on evoked potentials (EPs) and local field potential (LFP) activity within the hippocampus, and to assess closed-loop stimulation...
September 6, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/28917279/imri-during-transsphenoidal-surgery
#2
REVIEW
Prashant Chittiboina
A variety of intraoperative MRI (iMRI) systems are in use during transsphenoidal surgery (TSS). The variations in iMRI systems include field strengths, magnet configurations, and room configurations. Most studies report that the primary utility of iMRI during TSS lies in detecting resectable tumor residuals following maximal resection with conventional technique. Stereotaxis, neuronavigation, and complication avoidance/detection are enhanced by iMRI use during TSS. The use of iMRI during TSS can lead to increased extent of resection for large tumors...
October 2017: Neurosurgery Clinics of North America
https://www.readbyqxmd.com/read/28917276/stereotactic-biopsy-platforms-with-intraoperative-imaging-guidance
#3
REVIEW
Ahmed Mohyeldin, J Bradley Elder
The resolution and real-time navigation of intraoperative MRI (iMRI) has been leveraged in neurosurgery. We review frameless stereotactic biopsy platforms and focus on emerging technology integrating intraoperative MRI with frameless stereotaxy. Brain biopsy with iMRI allows for an accurate tissue sample with the ability to correct cannula trajectory during surgery, eliminating misdiagnosis secondary to faulty targeting. This technology allows for a percutaneous approach avoiding large incisions, obviates the need for frozen tissue evaluation, has the potential to reduce unnecessary specimen harvesting and operating room time, and optimizes safety of targeting deep brain lesions...
October 2017: Neurosurgery Clinics of North America
https://www.readbyqxmd.com/read/28882161/general-anesthesia-versus-local-anesthesia-in-stereotaxy-galaxy-for-parkinson-s-disease-study-protocol-for-a-randomized-controlled-trial
#4
R A Holewijn, D Verbaan, R M A de Bie, P R Schuurman
BACKGROUND: The aim of the study is to investigate if deep brain stimulation (DBS) in the subthalamic nucleus (STN) for Parkinson's disease (PD) under general anesthesia further improves outcome by lessening postoperative cognitive, mood, and behavioral adverse effects; shorten surgical time and hospital admittance; and produce comparable symptomatic and functional improvement to surgery under local anesthesia. METHODS/DESIGN: The study will be a single-center, prospective, randomized, open-label, blinded endpoint trial comparing DBS under general anesthesia with DBS under local anesthesia...
September 7, 2017: Trials
https://www.readbyqxmd.com/read/28862806/initial-experience-of-a-novel-mapping-system-combined-with-remote-magnetic-navigation-in-the-catheter-ablation-of-atrial-fibrillation
#5
Changjian Lin, Steen Pehrson, Peter Karl Jacobsen, Xu Chen
BACKGROUND: There have been advancements of sophisticated mapping systems used for ablation procedures over the last decade. Utilization of these novel mapping systems in combination with remote magnetic navigation (RMN) needs to be established. We investigated the new EnSite Precisionۛ mapping system (St Jude Medical, Inc.), which collects magnetic data for checking navigation field stability and is built on an open platform, allowing physicians to choose diagnostic and ablation catheters...
September 1, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28754645/accuracy-of-novel-ct-guided-frameless-stereotactic-drilling-and-catheter-system-in-human-cadavers
#6
Eric W Sankey, Eric Butler, John H Sampson
OBJECTIVE: In the present study, we evaluate the accuracy of a CT-guided frameless stereotactic drilling and catheter system. METHODS: A prospective, single-arm study was conducted using human cadaver heads to evaluate the placement accuracy of a novel, flexible intracranial catheter and a stabilizing bone-anchor system and drill kit. A total of 20 catheter placements were included for analysis. The primary endpoint of this study was the accuracy of catheter tip location on intra-operative CT...
July 25, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28725515/quantitative-anterior-and-posterior-clinoidectomy-analysis-and-mobilization-of-the-oculomotor-nerve-during-surgical-exposure-of-the-basilar-apex-using-frameless-stereotaxis
#7
Aclan Dogan, Justin S Cetas, Gregory J Anderson, Andy Rekito, Johnny B Delashaw
Background  Anterior and posterior clinoidectomies have been proposed to augment exposure of the basilar apex. A sequential quantitative benefit analysis offered by these maneuvers has not been reported. Methods  Fourteen datasets from eight cadaveric specimens were analyzed. A modified orbitozygomatic frontotemporal craniotomy was performed. The extent of proximal control of the basilar artery was determined through the exposed opticocarotid and carotidoculomotor triangles before and after clinoidectomies and mobilization of the third nerve at the porous oculomotarius...
August 2017: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/28682827/anesthesia-for-minimally-invasive-neurosurgery
#8
Hemanshu Prabhakar, Charu Mahajan, Indu Kapoor
PURPOSE OF REVIEW: With an ultimate aim of improving patients overall outcome and satisfaction, minimally invasive surgical approach is becoming more of a norm. The related anesthetic evidence has not expanded at the same rate as surgical and technological advancement. This article reviews the recent evidence on anesthesia and perioperative concerns for patients undergoing minimally invasive neurosurgery. RECENT FINDINGS: Minimally invasive cranial and spinal surgeries have been made possible only by vast technological development...
July 5, 2017: Current Opinion in Anaesthesiology
https://www.readbyqxmd.com/read/28669907/centre-surround-organization-of-fast-sensorimotor-integration-in-human-motor-hand-area
#9
Raffaele Dubbioso, Estelle Raffin, Anke Karabanov, Axel Thielscher, Hartwig Roman Siebner
Using the short-latency afferent inhibition (SAI) paradigm, transcranial magnetic stimulation (TMS) of the primary motor hand area (M1HAND) can probe how sensory input from limbs modulates corticomotor output in humans. Here we applied a novel TMS mapping approach to chart the spatial representation of SAI in human hand-knob. We hypothesized SAI is somatotopically expressed in M1HAND depending on both the site of peripheral electrical nerve stimulation and the cortical spot targeted by TMS within M1HAND. The left index or little finger was stimulated 23 ms before focal single-pulse TMS of the right M1HAND...
June 29, 2017: NeuroImage
https://www.readbyqxmd.com/read/28624892/a-meta-analysis-of-manual-versus-remote-magnetic-navigation-for-ventricular-tachycardia-ablation
#10
Mohit K Turagam, Donita Atkins, Roderick Tung, Moussa Mansour, Jeremy Ruskin, Jie Cheng, Luigi Di Biase, Andrea Natale, Dhanunjaya Lakkireddy
BACKGROUND: There are limited studies on the safety and efficacy of remote magnetic navigation (RMN) versus manual navigation (MAN) in ventricular tachycardia (VT) ablation. METHODS: A comprehensive literature search was performed using the keywords VT ablation, stereotaxis, RMN and MAN in Pubmed, Ebsco, Web of Science, Cochrane, and Google scholar databases. RESULTS: The analysis included seven studies (one randomized, three prospective observational, and three retrospective) including 779 patients [both structural heart disease (SHD) and idiopathic VT] comparing RMN (N = 433) and MAN (N = 339) in VT ablation...
September 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28521346/real-time-magnetic-resonance-imaging-guided-biopsy-using-smartframe%C3%A2-stereotaxis-in-the-setting-of-a-conventional-diagnostic-magnetic-resonance-imaging-suite
#11
Justin K Scheer, Thomas Hamelin, Leon Chang, Brian Lemkuil, Bob S Carter, Clark C Chen
BACKGROUND: Real-time magnetic resonance imaging (MRI) visualization during stereotactic needle biopsies affords several valuable benefits to the neurosurgeon, including the opportunity to visually confirm the biopsy site at the time of surgery. Until now, reported experiences with this technique have been limited to the setting of intraoperative MRI or dedicated procedural MRI suites with modified ventilation systems. OBJECTIVE: To describe our experience with 11 consecutive patients who underwent real-time MRI-guided biopsy performed using SmartFrame® stereotaxis (MRI Interventions, Irvine, California) in the setting of a conventional diagnostic MRI suite...
June 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28498054/first-clinical-use-of-stereotaxy-in-humans-the-key-role-of-x-ray-localization-discovered-by-gaston-contremoulins
#12
Pierre Bourdillon, Caroline Apra, Marc Lévêque
Although attempts to develop stereotactic approaches to intracranial surgery started in the late 19th century with Dittmar, Zernov, and more famously, Horsley and Clarke, widespread use of the technique for human brain surgery started in the second part of the 20th century. Remarkably, a significant similar surgical procedure had already been performed in the late 19th century by Gaston Contremoulins in France and has remained unknown. Contremoulins used the principles of modern stereotaxy in association with radiography for the first time, allowing the successful removal of intracranial bullets in 2 patients...
May 12, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28477277/an-efficient-cardiac-mapping-strategy-for-radiofrequency-catheter-ablation-with-active-learning
#13
Yingjing Feng, Ziyan Guo, Ziyang Dong, Xiao-Yun Zhou, Ka-Wai Kwok, Sabine Ernst, Su-Lin Lee
OBJECTIVE: A major challenge in radiofrequency catheter ablation procedures is the voltage and activation mapping of the endocardium, given a limited mapping time. By learning from expert interventional electrophysiologists (operators), while also making use of an active-learning framework, guidance on performing cardiac voltage mapping can be provided to novice operators or even directly to catheter robots. METHODS: A learning from demonstration (LfD) framework, based upon previous cardiac mapping procedures performed by an expert operator, in conjunction with Gaussian process (GP) model-based active learning, was developed to efficiently perform voltage mapping over right ventricles (RV)...
July 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28454992/accuracy-of-varioguide-frameless-stereotactic-system-against-frame-based-stereotaxy-prospective-randomized-single-center-study
#14
Ondrej Bradac, Anna Steklacova, Katerina Nebrenska, Jiri Vrana, Patricia de Lacy, Vladimir Benes
INTRODUCTION: Frameless stereotactic brain biopsy systems are widely used today. VarioGuide (VG) is a relatively novel frameless system. Its accuracy was studied in a laboratory setting but has not yet been studied in the clinical setting. The purpose of this study was to determine its accuracy and diagnostic yield and to compare this with frame-based (FB) stereotaxy. MATERIAL AND METHODS: Overall, 53 patients (33 males and 20 females, 60 ± 15 years old) were enrolled into this prospective, randomized, single-center study...
August 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28300710/frameless-and-maskless-stereotactic-navigation-with-a-skull-mounted-tracker
#15
Andrew A Fanous, Timothy G White, Matthew B Hirsch, Shamik Chakraborty, Peter D Costantino, David J Langer, John A Boockvar
OBJECTIVE: In this series, we present 3 cases that show the use of a skull-mounted tracker for image-guided navigation for anterior skull base surgery and ventricular catheter placement procedures. This system obviates fiducials or face masks during the surgical procedure itself and allows for the performance of facial incisions using the Weber-Ferguson approach. METHODS: Our series presents the use of a novel intraoperative navigational system that uses a skull-mounted tracker to navigated anterior skull base surgery...
June 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28298020/the-first-formulation-of-image-based-stereotactic-principles-the-forgotten-work-of-gaston-contremoulins
#16
Cole A Giller, Patrick Mornet, Jean-François Moreau
Although image-based human stereotaxis began with Spiegel and Wycis in 1947, the major principles of radiographic stereotaxis were formulated 50 years earlier by the French scientific photographer Gaston Contremoulins. In 1897, frustrated by the high morbidity of bullet extraction from the brain, the Parisian surgeon Charles Rémy asked Contremoulins to devise a method for bullet localization using the then new technology of x-rays. In doing so, Contremoulins conceived of many of the modern principles of stereotaxis, including the use of a reference frame, radiopaque fiducials for registration, images to locate the target in relation to the frame, phantom devices to locate the target in relation to the fiducial marks, and the use of an adjustable pointer to guide the surgical approach...
February 17, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28103603/real-time-ultrasound-guided-catheter-navigation-for-approaching-deep-seated-brain-lesions-role-of-intraoperative-neurosonography-with-and-without-fusion-with-magnetic-resonance-imaging
#17
Sunil Manjila, Aditya Karhade, Ji Hoon Phi, R Michael Scott, Edward R Smith
BACKGROUND/AIMS: Brain shift during the exposure of cranial lesions may reduce the accuracy of frameless stereotaxy. We describe a rapid, safe, and effective method to approach deep-seated brain lesions using real-time intraoperative ultrasound placement of a catheter to mark the dissection trajectory to the lesion. METHODS: With Institutional Review Board approval, we retrospectively reviewed the radiographic, pathologic, and intraoperative data of 11 pediatric patients who underwent excision of 12 lesions by means of this technique...
2017: Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28048393/su-f-t-529-dosimetric-investigation-of-a-rotating-gamma-ray-system-for-imagedguided-modulated-arc-radiotherapy
#18
C Ma, O Chibani, A Eldib, J Li, L Chen
PURPOSE: Because of their effectiveness and efficiency, rotational arc radiotherapy (MAT) techniques have been developed on both specialty machines such as Tomotherapy and conventional linear accelerators. This work investigates a new rotating Gamma therapy system for image guided MAT and SBRT of intra/extracranial tumors. METHODS: The CyberMAT system (Cyber Medical Corp., China) consists of a ring gantry with a gamma source (effective source size 1cm and 1.7cm respectively), a 120-leaf MLC, a kV CBCT and an EPID...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/27906933/anterior-cingulotomy-for-the-treatment-of-chronic-intractable-pain-a-systematic-review
#19
REVIEW
Justin Sharim, Nader Pouratian
BACKGROUND: Anterior cingulotomy for chronic pain aims to modulate patients' attention or emotional reaction to pain rather than to modulate pain intensity. OBJECTIVES: To evaluate the clinical efficacy, both short- and long-term, of anterior cingulotomy in the treatment of chronic pain. STUDY DESIGN: Systematic review. SETTING: This systematic review assessed studies reporting anterior cingulotomy for the treatment of chronic pain...
November 2016: Pain Physician
https://www.readbyqxmd.com/read/27903188/the-role-of-diffusion-tensor-imaging-tractography-for-gamma-knife-thalamotomy-planning
#20
João Gabriel Ribeiro Gomes, Alessandra Augusta Gorgulho, Amanda de Oliveira López, Crystian Wilian Chagas Saraiva, Lucas Petri Damiani, Anderson Martins Pássaro, João Victor Salvajoli, Ludmila de Oliveira Siqueira, Bernardo Peres Salvajoli, Antônio Afonso Ferreira De Salles
OBJECTIVE The role of tractography in Gamma Knife thalamotomy (GK-T) planning is still unclear. Pyramidal tractography might reduce the risk of radiation injury to the pyramidal tract and reduce motor complications. METHODS In this study, the ventralis intermedius nucleus (VIM) targets of 20 patients were bilaterally defined using Iplannet Stereotaxy Software, according to the anterior commissure-posterior commissure (AC-PC) line and considering the localization of the pyramidal tract. The 40 targets and tractography were transferred as objects to the GammaPlan Treatment Planning System (GP-TPS)...
December 2016: Journal of Neurosurgery
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