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https://www.readbyqxmd.com/read/28931252/a-simplified-method-of-accurate-postprocessing-of-diffusion-tensor-imaging-for-use-in-brain-tumor-resection
#1
Phillip A Bonney, Andrew K Conner, Lillian B Boettcher, Ahmed A Cheema, Chad A Glenn, Adam D Smitherman, Nathan A Pittman, Michael E Sughrue
BACKGROUND: Use of diffusion tensor imaging (DTI) in brain tumor resection has been limited in part by a perceived difficulty in implementing the techniques into neurosurgical practice. OBJECTIVE: To demonstrate a simple DTI postprocessing method performed without a neuroscientist and to share results in preserving patient function while aggressively resecting tumors. METHODS: DTI data are obtained in all patients with tumors located within presumed eloquent cortices...
February 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28924572/stereovision-based-integrated-system-for-point-cloud-reconstruction-and-simulated-brain-shift-validation
#2
Xiaochen Yang, Logan W Clements, Ma Luo, Saramati Narasimhan, Reid C Thompson, Benoit M Dawant, Michael I Miga
Intraoperative soft tissue deformation, referred to as brain shift, compromises the application of current image-guided surgery navigation systems in neurosurgery. A computational model driven by sparse data has been proposed as a cost-effective method to compensate for cortical surface and volumetric displacements. We present a mock environment developed to acquire stereoimages from a tracked operating microscope and to reconstruct three-dimensional point clouds from these images. A reconstruction error of 1 mm is estimated by using a phantom with a known geometry and independently measured deformation extent...
July 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28917285/fluorescence-imaging-agents-in-tumor-resection
#3
REVIEW
Walter Stummer, Eric Suero Molina
Intraoperative fluorescence imaging allows real-time identification of diseased tissue during surgery without being influenced by brain shift and surgery interruption. 5-Aminolevulinic acid, useful for malignant gliomas and other tumors, is the most broadly explored compound approved for fluorescence-guided resection. Intravenous fluorescein sodium has recently received attention, highlighting tumor tissue based on extravasation at the blood-brain barrier (defective in many brain tumors). Fluorescein in perfused brain, unselective extravasation in brain perturbed by surgery, and propagation with edema are concerns...
October 2017: Neurosurgery Clinics of North America
https://www.readbyqxmd.com/read/28905504/is-essential-tremor-a-single-entity
#4
Franziska Hopfner, Günther Deuschl
Essential tremor (ET) is a frequent movement disorder. A new tremor classification has subdivided ET, into the classical form with bilateral action tremor of the hands with or without involvement of further tremor locations and without any other explaining signs or symptoms for the tremor and into 'ET plus' which comes additionally with further neurologic signs of unknown origin. This will provide a better foundation for subclassifying the condition. The immediate cause of ET is a preformed oscillating network within the central nervous system as revealed with electrophysiologic methods...
September 14, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/28880999/stereo-eeg-diagnostic-and-therapeutic-tool-for-periventricular-nodular-heterotopia-epilepsies
#5
Laura Mirandola, Roberto F Mai, Stefano Francione, Veronica Pelliccia, Francesca Gozzo, Ivana Sartori, Lino Nobili, Francesco Cardinale, Massimo Cossu, Stefano Meletti, Laura Tassi
OBJECTIVE: Periventricular nodular heterotopias (PNHs) are malformations of cortical development related to neuronal migration disorders, frequently associated with drug-resistant epilepsy (DRE). Stereo-electroencephalography (SEEG) is considered a very effective step of the presurgical evaluation, providing the recognition of the epileptogenic zone (EZ). At the same time, via the intracerebral electrodes it is possible to perform radiofrequency thermocoagulation (SEEG-guided RF-TC) with the aim of ablating and/or disrupting the EZ...
September 7, 2017: Epilepsia
https://www.readbyqxmd.com/read/28872032/atlas-of-electroencephalography-3rd-edition
#6
Ali Akbar Asadi-Pooya, Dennis Dlugos, Christopher Skidmore, Michael R Sperling
Electroencephalography (EEG) is the recording of the electrical activity of the brain. EEG is a reliable test to assess cerebral function. It aids in diagnosis, classification, and management of patients with epilepsy. It also has practical uses in conditions other than epilepsy. Moreover, it is harmless and inexpensive. EEG is an important tool for evaluating patients with epilepsy. It may help classify the syndrome, identify the likely source of focal seizures, and confirm a diagnosis of status epilepticus...
September 5, 2017: Epileptic Disorders: International Epilepsy Journal with Videotape
https://www.readbyqxmd.com/read/28844925/case-study-multimodal-18-f-fluciclovine-pet-mri-and-ultrasound-guided-neurosurgery-of-an-anaplastic-oligodendroglioma
#7
Anna Karlberg, Erik Magnus Berntsen, Håkon Johansen, Mariane Myrthue, Anne Jarstein Skjulsvik, Ingerid Reinertsen, Morteza Esmaeili, Hong Yan Dai, Yiming Xiao, Hassan Rivaz, Per Borghammer, Ole Solheim, Live Eikenes
BACKGROUND: Structural MRI and histopathological tissue sampling are routinely performed as part of the diagnostic work-up of glioma patients. Due to the heterogeneous nature of gliomas, there is however a risk of undergrading caused by histopathological sampling errors. MRI has limitations in identifying tumor grade and type, detecting diffuse invasive growth, and separating recurrences from treatment induced changes. PET can provide quantitative information of cellular activity and metabolism, and may therefore complement MRI...
August 24, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28842674/hyperspectral-data-processing-improves-ppix-contrast-during-fluorescence-guided-surgery-of-human-brain-tumors
#8
J J Bravo, J D Olson, S C Davis, D W Roberts, K D Paulsen, S C Kanick
Fluorescence guided surgery (FGS) using aminolevulinic-acid (ALA) induced protoporphyrin IX (PpIX) provides intraoperative visual contrast between normal and malignant tissue during resection of high grade gliomas. However, maps of the PpIX biodistribution within the surgical field based on either visual perception or the raw fluorescence emissions can be masked by background signals or distorted by variations in tissue optical properties. This study evaluates the impact of algorithmic processing of hyperspectral imaging acquisitions on the sensitivity and contrast of PpIX maps...
August 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28842233/pattern-of-corticospinal-projections-defined-by-brain-mapping-during-resective-epilepsy-surgery-in-a-patient-with-congenital-hemiparesis-and-intractable-epilepsy
#9
Chen-Ya Yang, Hsin-Hung Chen, Chien Chen, Jan-Wei Chiu, Chen-Liang Chou, Tsui-Fen Yang
BACKGROUND: Congenital or early acquired brain structural lesions often cause contralateral hemiparesis as well as cognitive deficits, developmental delays, and seizures. Among them, seizure is the most debilitating condition, as it greatly impairs the quality of life in both the affected individuals and their caregivers and prevents them from active social participation. CASE DESCRIPTION: Here, we present a 34-year-old man with hemiparesis and early-onset seizures since childhood owing to a congenital brain lesion...
August 22, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28842228/microelectrode-recording-guided-versus-intraoperative-mri-guided-in-stn-deep-brain-stimulation-surgery-for-parkinson-s-disease-a-one-year-follow-up-study
#10
Xuemeng Liu, Jibo Zhang, Kai Fu, Rui Gong, Jincao Chen, Jie Zhang
Microelectrode recording (MER) and Intraoperative MRI (iMRI) have been used in DBS surgery for Parkinson's disease (PD), but comparative methodology is as yet lacking. Therefore, we compared the one-year follow-up outcomes of MER guided and iMRI guided STN-DBS surgery in PD patients. METHOD: We conducted a review comparing PD patients who underwent MER guided (n=76, group A) and iMRI guided STN-DBS surgery (n=61, group B ) in our institution. Pre- and postoperative assessments included UPDRS-III score, PDQ-39, MMSE, LEDDs and MR images...
August 22, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28812201/effectiveness-of-navigation-guided-cyst-aspiration-before-resection-of-large-cystic-brain-tumors-a-proof-of-concept-for-more-radical-surgery
#11
Tae Hoon Roh, Kyoung Su Sung, Seok-Gu Kang, Ju Hyung Moon, Eui Hyun Kim, Sun Ho Kim, Jong Hee Chang
BACKGROUND: Resection of tumors close to the corticospinal tract (CST) carries a high risk of damage to the CST. For cystic tumors, aspirating the cyst before resection may reduce the risk of damage to vital structures. This study evaluated the effectiveness of cyst aspiration, by comparing the results before and after aspiration of diffusion tensor image (DTI) tractography. METHODS: This study enrolled 23 patients with large cystic brain tumors (>20 cm(3)) between 2012 and 2016...
August 16, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28795843/intraoperative-imaging-techniques-for-glioma-surgery
#12
Tomas Garzon-Muvdi, Carmen Kut, Xingde Li, Kaisorn L Chaichana
Gliomas are CNS neoplasms that infiltrate the surrounding brain parenchyma, complicating their treatment. Tools that increase extent of resection while preventing neurological deficit are essential to improve prognosis of patients diagnosed with gliomas. Tools such as intraoperative MRI, ultrasound and fluorescence-guided microsurgery have been used in the surgical resection of CNS gliomas with the goal of maximizing extent of resection to improve patient outcomes. In addition, emerging experimental techniques, for example, optical coherence tomography and Raman spectroscopy are promising techniques which could 1 day add to the increasing armamentarium used in the surgical resection of CNS gliomas...
August 2017: Future Oncology
https://www.readbyqxmd.com/read/28750949/a-machine-learning-approach-for-real-time-modelling-of-tissue-deformation-in-image-guided-neurosurgery
#13
Michele Tonutti, Gauthier Gras, Guang-Zhong Yang
OBJECTIVES: Accurate reconstruction and visualisation of soft tissue deformation in real time is crucial in image-guided surgery, particularly in augmented reality (AR) applications. Current deformation models are characterised by a trade-off between accuracy and computational speed. We propose an approach to derive a patient-specific deformation model for brain pathologies by combining the results of pre-computed finite element method (FEM) simulations with machine learning algorithms...
July 2017: Artificial Intelligence in Medicine
https://www.readbyqxmd.com/read/28748623/photoacoustic-guided-surgery-with-indocyanine-green-coated-superparamagnetic-iron-oxide-nanoparticle-clusters
#14
Jayesh P Thawani, Ahmad Amirshaghaghi, Lesan Yan, Joel M Stein, Jessica Liu, Andrew Tsourkas
A common cause of local tumor recurrence in brain tumor surgery results from incomplete surgical resection. Adjunctive technologies meant to facilitate gross total resection have had limited efficacy to date. Contrast agents used to delineate tumors preoperatively cannot be easily or accurately used in the real-time operative setting. Although multimodal imaging contrast agents are developed to help the surgeon discern tumor from normal tissue in the operating room, these contrast agents are not readily translatable...
July 27, 2017: Small
https://www.readbyqxmd.com/read/28738091/the-second-window-icg-technique-demonstrates-a-broad-plateau-period-for-near-infrared-fluorescence-tumor-contrast-in-glioblastoma
#15
Ryan Zeh, Saad Sheikh, Leilei Xia, John Pierce, Andrew Newton, Jarrod Predina, Steve Cho, MacLean Nasrallah, Sunil Singhal, Jay Dorsey, John Y K Lee
INTRODUCTION: Fluorescence-guided surgery has emerged as a powerful tool to detect, localize and resect tumors in the operative setting. Our laboratory has pioneered a novel way to administer an FDA-approved near-infrared (NIR) contrast agent to help surgeons with this task. This technique, coined Second Window ICG, exploits the natural permeability of tumor vasculature and its poor clearance to deliver high doses of indocyanine green (ICG) to tumors. This technique differs substantially from established ICG video angiography techniques that visualize ICG within minutes of injection...
2017: PloS One
https://www.readbyqxmd.com/read/28730260/longer-survival-of-a-patient-with-glioblastoma-resected-with-5-aminolevulinic-acid-5-ala-guided-surgery-and-foreign-body-reaction-to-polyglycolic-acid-pga-suture
#16
Raluca Maria Munteanu, Lucian Eva, Bogdan IonuŢ DobrovăŢ, Alin Constantin Iordache, Liviu Pendefunda, Nicoleta Dumitrescu, Doina Mihăilă, Cristina Maria Gavrilescu, Elena Şapte, Ion Poeată
In recent years, there is a growing evidence that using 5-aminolevulinic acid (5-ALA)-guided resection of a cerebral glioblastoma, associated with chemoradiotherapy determine a prolonged survival of these patients, even though this period do not exceed 15 months. 5-ALA is a natural biochemical precursor of heme that is metabolized to fluorescent porphyrins, particularly protoporphyrin IX (PPIX) and no foreign reaction were noted until now. However, foreign body reaction developing in neurosurgery is documented in a few number of cases to suture material, surgical hemostatic material, or surgical glove starch, but up to now we could not find any article about granulomatous inflammation to polyglycolic acid (PGA) suture after brain tumor resection...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28680389/post-mortem-validation-of-mri-identified-veins-on-the-surface-of-the-cerebral-cortex-as-potential-landmarks-for-neurosurgery
#17
Günther Grabner, Thomas Haider, Mark Glassner, Alexander Rauscher, Hannes Traxler, Siegfried Trattnig, Simon D Robinson
Background and Objective: Image-guided neurosurgery uses information from a wide spectrum of methods to inform the neurosurgeon's judgement about which tissue to resect and which to spare. Imaging data are registered to the patient's skull so that they correspond to the intraoperative macro- and microscopic view. The correspondence between imaging and optical systems breaks down during surgery, however, as a result of cerebro-spinal fluid drain age, tissue resection, and gravity-based brain shift. In this work we investigate whether a map of surface veins, automatically segmented from MRI, could serve as additional reference system...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28676821/intraoperative-imaging-modalities-and-compensation-for-brain-shift-in-tumor-resection-surgery
#18
REVIEW
Siming Bayer, Andreas Maier, Martin Ostermeier, Rebecca Fahrig
Intraoperative brain shift during neurosurgical procedures is a well-known phenomenon caused by gravity, tissue manipulation, tumor size, loss of cerebrospinal fluid (CSF), and use of medication. For the use of image-guided systems, this phenomenon greatly affects the accuracy of the guidance. During the last several decades, researchers have investigated how to overcome this problem. The purpose of this paper is to present a review of publications concerning different aspects of intraoperative brain shift especially in a tumor resection surgery such as intraoperative imaging systems, quantification, measurement, modeling, and registration techniques...
2017: International Journal of Biomedical Imaging
https://www.readbyqxmd.com/read/28659546/focused-ultrasound-treatment-present-and-future
#19
Keiichi Abe, Takaomi Taira
The discovery that ultrasound waves could be focused inside the skull and heated to high temperatures at a focal point goes back to 1944. However, because the skull causes the ultrasound waves to attenuate and scatter, it was believed that application of this technology would be difficult, and that it would be impossible to use this approach in the surgical treatment of intracranial diseases. Eventually, magnetic resonance image guided focused ultrasound (MRgFUS) surgery began being used to treat uterine fibroids, breast cancer and bone metastasis and locally confined prostate cancer...
August 15, 2017: Neurologia Medico-chirurgica
https://www.readbyqxmd.com/read/28651099/brain-shift-compensation-using-intraoperative-ultrasound-and-constraint-based-biomechanical-simulation
#20
Fanny Morin, Hadrien Courtecuisse, Ingerid Reinertsen, Florian Le Lann, Olivier Palombi, Yohan Payan, Matthieu Chabanas
PURPOSE: During brain tumor surgery, planning and guidance are based on preoperative images which do not account for brain-shift. However, this deformation is a major source of error in image-guided neurosurgery and affects the accuracy of the procedure. In this paper, we present a constraint-based biomechanical simulation method to compensate for craniotomy-induced brain-shift that integrates the deformations of the blood vessels and cortical surface, using a single intraoperative ultrasound acquisition...
June 15, 2017: Medical Image Analysis
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