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https://www.readbyqxmd.com/read/28230717/imaging-performance-of-a-handheld-ultrasound-system-with-real-time-computer-aided-detection-of-lumbar-spine-anatomy-a-feasibility-study
#1
Mohamed Tiouririne, Adam J Dixon, F William Mauldin, David Scalzo, Arun Krishnaraj
OBJECTIVES: The aim of this study was to evaluate the imaging performance of a handheld ultrasound system and the accuracy of an automated lumbar spine computer-aided detection (CAD) algorithm in the spines of human subjects. MATERIALS AND METHODS: This study was approved by the institutional review board of the University of Virginia. The authors designed a handheld ultrasound system with enhanced bone image quality and fully automated CAD of lumbar spine anatomy...
February 22, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28227989/computational-models-of-non-invasive-brain-and-spinal-cord-stimulation
#2
Pedro C Miranda, Ricardo Salvador, Cornelia Wenger, Sofia R Fernandes, Pedro C Miranda, Ricardo Salvador, Cornelia Wenger, Sofia R Fernandes, Sofia R Fernandes, Pedro C Miranda, Cornelia Wenger, Ricardo Salvador
Non-invasive brain and spinal cord stimulation techniques are increasingly used for diagnostic and therapeutic purposes. Knowledge of the spatial distribution of the induced electric field is necessary to interpret experimental results and to optimize field delivery. Since the induced electric field cannot be measured in vivo in humans, computational models play a fundamental role in determining the characteristics of the electric field. We produced computational models of the head and trunk to calculate the electric field induced in the brain and spinal cord by transcranial magnetic stimulation, transcranial direct current stimulation and transcutaneous spinal cord direct current stimulation...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227766/short-association-bundle-atlas-based-on-inter-subject-clustering-from-hardi-data
#3
C Roman, M Guevara, D Duclap, A Lebois, C Poupon, J-F Mangin, P Guevara, C Roman, M Guevara, D Duclap, A Lebois, C Poupon, J-F Mangin, P Guevara, J-F Mangin, C Roman, D Duclap, C Poupon, A Lebois, P Guevara, M Guevara
This paper is focused on the study of short brain association fibers. We present an automatic method to identify short bundles of the superficial white matter based on inter-subject hierarchical clustering. Our method finds clusters of similar fibers, belonging to the different subjects, according to a distance measure between fibers. First, the algorithm obtains representative bundles and subsequently we perform an automatic labeling based on the anatomy, of the most stable connections. The analysis was applied to two independent groups of 37 subjects...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28220752/putting-3d-modelling-and-3d-printing-into-practice-virtual-surgery-and-preoperative-planning-to-reconstruct-complex-post-traumatic-skeletal-deformities-and-defects
#4
Kevin Tetsworth, Steve Block, Vaida Glatt
3D printing technology has revolutionized and gradually transformed manufacturing across a broad spectrum of industries, including healthcare. Nowhere is this more apparent than in orthopaedics with many surgeons already incorporating aspects of 3D modelling and virtual procedures into their routine clinical practice. As a more extreme application, patient-specific 3D printed titanium truss cages represent a novel approach for managing the challenge of segmental bone defects. This review illustrates the potential indications of this innovative technique using 3D printed titanium truss cages in conjunction with the Masquelet technique...
2017: SICOT-J
https://www.readbyqxmd.com/read/28220583/morphometric-analysis-of-prostate-zonal-anatomy-using-magnetic-resonance-imaging-mri-the-impact-on-age-related-changes-in-japanese-and-american-populations
#5
Toru Matsugasumi, Atsuko Fujihara, So Ushijima, Motohiro Kanazawa, Yasuhiro Yamada, Takumi Shiraishi, Fumiya Hongo, Kazumi Kamoi, Koji Okihara, Andre Luis de Castro Abreu, Masakatsu Oishi, Toshitaka Shin, Suzanne Palmer, Inderbir S Gill, Osamu Ukimura
OBJECTIVES: Magnetic resonance imaging (MRI) can be used to reliably evaluate prostate zonal anatomy. Objectives of this study was to evaluate the impact of morphometric MRI analysis of the prostate zonal anatomy on aging, prostatic hypertrophy, and lower urinary tract symptoms in patients from Japan and the USA. SUBJECTS AND METHODS: A retrospective analysis of 307 men, including Japanese (n=156) and American (n=151) patients, who consecutively underwent 3-Tesla MRI and International Prostate Symptom Score (IPSS) due to elevated PSA...
February 20, 2017: BJU International
https://www.readbyqxmd.com/read/28217397/a5-segment-aneurysm-of-the-anterior-cerebral-artery-imbedded-into-the-body-of-the-corpus-callosum-a-case-report
#6
Fransua Sharafeddin, Ahmad Hafez, Martin Lehecka, Rahul Raj, Roberto Colasanti, Ahmadreza Rafiei, Joham Choque, Behnam R Jahromi, Mika Niemelä, Juha Hernesniemi
BACKGROUND: The A5 segment aneurysms of the anterior cerebral artery are rare, approximately 0.5% of all intracranial aneurysms. They are small with a wide base located in the midline, with the domes mostly projecting upward or backward. CASE DESCRIPTION: The authors describe a unique case of A5 segment aneurysm, with the dome embedded into the body of the corpus callosum. This 41-year-old female was admitted to the neurology department for possible multiple sclerosis investigation...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28214484/hybrid-operative-thrombectomy-is-noninferior-to-percutaneous-techniques-for-the-treatment-of-acute-iliofemoral-deep-venous-thrombosis
#7
Limael E Rodríguez, Aihab Aboukheir-Aboukheir, Ricardo Figueroa-Vicente, Hiram Soler-Bernardini, Guillermo Bolanos-Avila, Luis J Torruella-Bartolomei, Anthony J Comerota, Jorge L Martinez-Trabal
OBJECTIVE: Hybrid operative thrombectomy (HOT) is a novel technique for the treatment of acute iliofemoral deep venous thrombosis (IFDVT) and is an alternative to percutaneous techniques (PTs) that use thrombolytics. In this study, we compare perioperative and intermediate outcomes of HOT vs PT as interventions for early thrombus removal. METHODS: From July 2008 to May 2015, there were 71 consecutive patients who were treated with either PT (n = 31) or HOT (n = 40) for acute or subacute single-limb IFDVT...
March 2017: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/28208926/simultaneous-transabdominal-hysterectomy-and-cystolithotomy-in-an-augmented-urinary-bladder-challenges-and-outcome
#8
Vijay Sharma, Rakesh Kapoor, Priyank Yadav, Pankaj Gaur, Deepa Kapoor
Augmentation cystoplasty is a procedure to increase the anatomical as well as functional capacity of the urinary bladder using a segment of bowel or ureter. Upto half of these patients develop complications but most of them are minor and managed easily. Urolithiasis, especially bladder calculi are seen in upto half of the cases and are removed endoscopically or by open approach. Hysterectomy is an uncommon procedure in patients with augmentation cystoplasty and is complicated by the altered anatomy of the pelvis...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28198523/diversity-among-posterior-thalamoperforating-branches-originated-from-p1-segment-systematic-review
#9
Cezary Grochowski, Ryszard Maciejewski
BACKGROUND: The P1 segment of the posterior cerebral artery (PCA) begins at the termination of the basilar artery and ends at the origin of posterior communicating artery (PCoM), within the interpeduncular cistern. Perforating branches arising from this segment are called posterior thalamoperforating arteries and the main and biggest artery among those is called thalamoperforating artery (TPA). Perforating branches are a crucial component of cerebrovascular system supplying the posterior part of the thalamus, subthalamus, hypothalamus, substantia nigra, perforated substance, posterior part of internal capsule and the nucleus of III and IV cranial nerve...
February 15, 2017: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/28196403/morphologic-patterns-formed-by-the-anomalous-fibers-occurring-along-the-anterior-capsule-of-the-crystalline-lens-in-people-with-the-long-anterior-zonule-trait
#10
Daniel K Roberts, Yongyi Yang, Christina E Morettin, Tricia L Newman, Mary F Roberts, Jacob T Wilensky
People with the long anterior zonule (LAZ) trait, which may have prevalence near 2%, have zonular fibers that extend more central than usual along the anterior capsule of the crystalline lens. The anomalous fibers can be observed in vivo with clinical slit lamp biomicroscopy after pharmacologic pupil dilation, and although minimally studied, the LAZ trait may have importance to glaucoma, retinal degeneration, and cataract surgery. To further characterize LAZ morphology, a custom computer program was used to trace LAZ fibers seen on retro-illumination photos acquired during previous study at an academic, urban eye care facility in Chicago, IL...
February 14, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28194831/comparing-two-processing-pipelines-to-measure-subcortical-and-cortical-volumes-in-patients-with-and-without-mild-traumatic-brain-injury
#11
Matthew W Reid, Nathan P Hannemann, Gerald E York, John L Ritter, Jonathan A Kini, Jeffrey D Lewis, Paul M Sherman, Carmen S Velez, Ann Marie Drennon, Jacob D Bolzenius, David F Tate
PURPOSE: To compare volumetric results from NeuroQuant® and FreeSurfer in a service member setting. Since the advent of medical imaging, quantification of brain anatomy has been a major research and clinical effort. Rapid advancement of methods to automate quantification and to deploy this information into clinical practice has surfaced in recent years. NeuroQuant® is one such tool that has recently been used in clinical settings. Accurate volumetric data are useful in many clinical indications; therefore, it is important to assess the intermethod reliability and concurrent validity of similar volume quantifying tools...
February 14, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28192130/ielvis-an-open-source-matlab-toolbox-for-localizing-and-visualizing-human-intracranial-electrode-data
#12
David M Groppe, Stephan Bickel, Andrew R Dykstra, Xiuyuan Wang, Pierre Mégevand, Manuel R Mercier, Fred A Lado, Ashesh D Mehta, Christopher J Honey
BACKGROUND: Intracranial electrical recordings (iEEG) and brain stimulation (iEBS) are invaluable human neuroscience methodologies. However, the value of such data is often unrealized as many laboratories lack tools for localizing electrodes relative to anatomy. To remedy this, we have developed a MATLAB toolbox for intracranial electrode localization and visualization, iELVis. NEW METHOD: iELVis uses existing tools (BioImage Suite, FSL, and FreeSurfer) for preimplant magnetic resonance imaging (MRI) segmentation, neuroimaging coregistration, and manual identification of electrodes in postimplant neuroimaging...
February 9, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28191601/the-maxillary-artery-and-its-variants-an-anatomical-study-with-neurosurgical-applications
#13
Jorge E Alvernia, Joaquin Hidalgo, Marc P Sindou, Chad Washington, Gustavo Luzardo, Eddie Perkins, Remi Nader, Patrick Mertens
BACKGROUND: The maxillary artery (MA) has gained attention in neurosurgery particularly in cerebral revascularization techniques, intracranial endonasal approaches and endovascular procedures. OBJECTIVES: To describe and illustrate the anatomy of the MA and its neurosurgical importance in a detailed manner. METHODS: Six cadaveric heads (12 MAs) were injected with latex. The arteries and surrounding structures were dissected and studied using microsurgical techniques...
February 13, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28188873/an-improved-fsl-first-pipeline-for-subcortical-gray-matter-segmentation-to-study-abnormal-brain-anatomy-using-quantitative-susceptibility-mapping-qsm
#14
Xiang Feng, Andreas Deistung, Michael G Dwyer, Jesper Hagemeier, Paul Polak, Jessica Lebenberg, Frédérique Frouin, Robert Zivadinov, Jürgen R Reichenbach, Ferdinand Schweser
Accurate and robust segmentation of subcortical gray matter (SGM) nuclei is required in many neuroimaging applications. FMRIB's Integrated Registration and Segmentation Tool (FIRST) is one of the most popular software tools for automated subcortical segmentation based on T1-weighted (T1w) images. In this work, we demonstrate that FIRST tends to produce inaccurate SGM segmentation results in the case of abnormal brain anatomy, such as present in atrophied brains, due to a poor spatial match of the subcortical structures with the training data in the MNI space as well as due to insufficient contrast of SGM structures on T1w images...
February 7, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28186181/detailed-vascular-anatomy-of-the-human-retina-by-projection-resolved-optical-coherence-tomography-angiography
#15
J P Campbell, M Zhang, T S Hwang, S T Bailey, D J Wilson, Y Jia, D Huang
Optical coherence tomography angiography (OCTA) is a noninvasive method of 3D imaging of the retinal and choroidal circulations. However, vascular depth discrimination is limited by superficial vessels projecting flow signal artifact onto deeper layers. The projection-resolved (PR) OCTA algorithm improves depth resolution by removing projection artifact while retaining in-situ flow signal from real blood vessels in deeper layers. This novel technology allowed us to study the normal retinal vasculature in vivo with better depth resolution than previously possible...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28169918/bilateral-blebs-secondary-to-spontaneous-scleral-perforations
#16
Ester Fernández López, Alexander Poon, Andrew Huhtanen, Richard Lindsay, Catherine Green
PURPOSE: To report an unusual case of bilateral spontaneous scleral perforations. METHODS: A 34-year-old woman presented with bilateral conjunctival blebs and decreased vision in both eyes. There was no history of ocular trauma or surgery and no previous ophthalmic or systemic conditions that may have contributed to the scleral perforations. RESULTS: Best-corrected visual acuity was 20/40 in both eyes and intraocular pressures were 6 mm Hg in the right and 5 mm Hg in the left...
February 6, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/28135646/gap-free-segmentation-of-vascular-networks-with-automatic-image-processing-pipeline
#17
Chih-Yang Hsu, Mahsa Ghaffari, Ali Alaraj, Michael Flannery, Xiaohong Joe Zhou, Andreas Linninger
Current image processing techniques capture large vessels reliably but often fail to preserve connectivity in bifurcations and small vessels. Imaging artifacts and noise can create gaps and discontinuity of intensity that hinders segmentation of vascular trees. However, topological analysis of vascular trees require proper connectivity without gaps, loops or dangling segments. Proper tree connectivity is also important for high quality rendering of surface meshes for scientific visualization or 3D printing...
March 1, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28134003/development-of-a-patient-specific-3d-printed-liver-model-for-preoperative-planning
#18
Marta J Madurska, Matthieu Poyade, David Eason, Paul Rea, Angus J M Watson
INTRODUCTION: Liver surgery is widely used as a treatment modality for various liver pathologies. Despite significant improvement in clinical care, operative strategies, and technology over the past few decades, liver surgery is still risky, and optimal preoperative planning and anatomical assessment are necessary to minimize risks of serious complications. 3D printing technology is rapidly expanding, and whilst appliactions in medicine are growing, but its applications in liver surgery are still limited...
January 1, 2017: Surgical Innovation
https://www.readbyqxmd.com/read/28133417/concatenated-spatially-localized-random-forests-for-hippocampus-labeling-in-adult-and-infant-mr-brain-images
#19
Lichi Zhang, Qian Wang, Yaozong Gao, Guorong Wu, Dinggang Shen
Automatic labeling of the hippocampus in brain MR images is highly demanded, as it has played an important role in imaging-based brain studies. However, accurate labeling of the hippocampus is still challenging, partially due to the ambiguous intensity boundary between the hippocampus and surrounding anatomies. In this paper, we propose a concatenated set of spatially-localized random forests for multi-atlas-based hippocampus labeling of adult/infant brain MR images. The contribution in our work is two-fold...
March 15, 2017: Neurocomputing
https://www.readbyqxmd.com/read/28131788/protective-properties-of-the-arterial-system-against-peripherally-generated-waves
#20
Marcin Majka, Giacomo Gadda, Angelo Taibi, Mirosław Gałązka, Piotr Zieliński
An anatomically detailed model consisting of a network of electric transmission lines is developed to simulate propagation of the pulse waves in humans. The simulations show that the real arterial tree geometry, together with the elastic and rheological parameters of particular segments, ensure an efficient protection of vital organs against pulse waves generated at peripheral locations. Because locomotive movements are the most obvious source of such disturbances, additional cyclic perturbations are applied to the model femoral arteries...
January 25, 2017: Mathematical Biosciences
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