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https://www.readbyqxmd.com/read/28325031/magnetic-resonance-imaging-receiver-coil-decoupling-using-circumferential-shielding-structures
#1
Jhy-Neng Tasso Yeh, Fa-Hsuan Lin
We propose a flexible phased-array design using circular coils with circumferential shielding structure to achieve robust decoupling between coil elements when the array is either bended or on a flat plane. Two types of circumferential shielding were tested through numerical simulation and imaging experiment. The results demonstrated that our arrays have good decoupling between coils when they are on a curved surface with S21 <; -16.72 dB. Both types perform higher SNR images than a commercially available 32-channel adult head coil array...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324941/3-d-registration-on-carotid-artery-imaging-data-mri-for-different-timesteps
#2
Paschalis A Bizopoulos, Antonis Sakellarios, Lampros K Michalis, Dimitrios D Koutsouris, Dimitrios I Fotiadis
A common problem which is faced by the researchers when dealing with arterial carotid imaging data is the registration of the geometrical structures between different imaging modalities or different timesteps. The use of the "Patient Position" DICOM field is not adequate to achieve accurate results due to the fact that the carotid artery is a relatively small structure and even imperceptible changes in patient position and/or direction make it difficult. While there is a wide range of simple/advanced registration techniques in the literature, there is a considerable number of studies which address the geometrical structure of the carotid artery without using any registration technique...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324693/cortical-complexity-in-bipolar-disorder-applying-a-spherical-harmonics-approach
#3
Igor Nenadic, Rachel A Yotter, Maren Dietzek, Kerstin Langbein, Heinrich Sauer, Christian Gaser
Recent studies using surface-based morphometry of structural magnetic resonance imaging data have suggested that some changes in bipolar disorder (BP) might be neurodevelopmental in origin. We applied a novel analysis of cortical complexity based on fractal dimensions in high-resolution structural MRI scans of 18 bipolar disorder patients and 26 healthy controls. Our region-of-interest based analysis revealed increases in fractal dimensions (in patients relative to controls) in left lateral orbitofrontal cortex and right precuneus, and decreases in right caudal middle frontal, entorhinal cortex, and right pars orbitalis, and left fusiform and posterior cingulate cortices...
February 21, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28324681/morphometric-mri-features-are-associated-with-surgical-outcome-in-mesial-temporal-lobe-epilepsy-with-hippocampal-sclerosis
#4
Maria Teresa Fernandes Castilho Garcia, Larissa Botelho Gaça, Gabriel Barbosa Sandim, Idaiane Batista Assunção Leme, Henrique Carrete, Ricardo Silva Centeno, João Ricardo Sato, Elza Márcia Targas Yacubian
PURPOSE: Corticoamygdalohippocampectomy (CAH) improves seizure control, quality of life, and decreases mortality for refractory mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE-HS). One-third of patients continue having seizures, and it is pivotal to determine structural abnormalities that might influence the postoperative outcome. Studies indicate that nonhippocampal regions may play a role in the epileptogenic network in MTLE-HS and could generate seizures postoperatively...
March 1, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28324130/the-oblique-popliteal-ligament-an-anatomic-and-mri-investigation
#5
Mandy Hedderwick, Mark D Stringer, Liam McRedmond, Grant R Meikle, Stephanie J Woodley
PURPOSE: Despite being the largest ligament on the posterior aspect of the knee, relatively little is known about the normal morphology of the oblique popliteal ligament (OPL). The aim of this study was to investigate the detailed anatomy of the OPL in cadavers and healthy volunteers. METHODS: The posterior knee was investigated in 25 cadaver lower limbs (mean age 76 ± 9.5 years; 7 men) by dissection, histology, and serial plastination and in 14 healthy individuals (mean age 23 ± 3...
March 21, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28324121/-impingement-syndrome-of-the-ankle
#6
R-I Milos, L B Fritz, C Schueller-Weidekamm
Impingement syndrome of the ankle is a clinical diagnosis caused posttraumatically by overuse due to repetitive mechanical loading or the presence of predisposing anatomical variants. Ankle impingement syndrome is characterized by chronic pain and limited range of movement caused by mechanical compression of bony or soft tissues within the joint compartments. Ankle impingement syndrome is classified according to the various anatomical locations around the tibiotalar joint as anterior, anterolateral, anteromedial, posterior or posteromedial...
March 21, 2017: Der Radiologe
https://www.readbyqxmd.com/read/28324003/biliary-anomalies-in-patients-with-hnf1b-diabetes
#7
Jarno Lt Kettunen, Helka Parviainen, Päivi J Miettinen, Martti Färkkilä, Marjo Tamminen, Pia Salonen, Eila Lantto, Tiinamaija Tuomi
Context: The clinical spectrum of organogenetic anomalies associated with HNF1B mutations is heterogeneous. Besides cystic kidney disease, diabetes, and various other manifestations, odd cases of mainly neonatal and post-transplant cholestasis have been described. The biliary phenotype is incompletely defined. Objective: To systematically characterize HNF1B-related anomalies in the bile ducts by imaging with MRI or MRCP. Setting and Patients: Fourteen patients with HNF1B mutations in the catchment area of the Helsinki University hospital were evaluated with upper abdominal MRI and MRCP...
March 17, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28323985/utility-of-fdg-pet-imaging-for-risk-stratification-of-pancreatic-neuroendocrine-tumours-in-men-1
#8
E R Kornaczewski Jackson, O P Pointon, R Bohmer, J R Burgess
Context: Patients with Multiple Endocrine Neoplasia Type 1 (MEN 1) are at high risk of malignant pancreatic Neuroendocrine Tumours (pNETs). Structural imaging is typically used to screen for pNETs, but is suboptimal for stratifying malignant potential. Objective: To determine the utility of Fluorodeoxyglucose (18F) positron emission tomography/computed tomography (18F-FDG PET/CT) for predicting the malignant potential of pNETs in MEN 1. Design: Retrospective observational study...
March 7, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28323838/bupropion-for-the-treatment-of-apathy-in-huntington-s-disease-a-multicenter-randomised-double-blind-placebo-controlled-prospective-crossover-trial
#9
Harald Gelderblom, Torsten Wüstenberg, Tim McLean, Lisanne Mütze, Wilhelm Fischer, Carsten Saft, Rainer Hoffmann, Sigurd Süssmuth, Peter Schlattmann, Erik van Duijn, Bernhard Landwehrmeyer, Josef Priller
OBJECTIVE: To evaluate the efficacy and safety of bupropion in the treatment of apathy in Huntington's disease (HD). METHODS: In this phase 2b multicentre, double-blind, placebo-controlled crossover trial, individuals with HD and clinical signs of apathy according to the Structured Clinical Interview for Apathy-Dementia (SCIA-D), but not depression (n = 40) were randomized to receive either bupropion 150/300mg or placebo daily for 10 weeks. The primary outcome parameter was a significant change of the Apathy Evaluation Scale (AES) score after ten weeks of treatment as judged by an informant (AES-I) living in close proximity with the study participant...
2017: PloS One
https://www.readbyqxmd.com/read/28323572/bilateral-changes-in-deep-tissue-environment-after-manual-lymphatic-drainage-in-patients-with-breast-cancer-treatment-related-lymphedema
#10
Paula M C Donahue, Rachelle Crescenzi, Allison O Scott, Vaughn Braxton, Aditi Desai, Seth A Smith, John Jordi, Ingrid M Meszoely, Ana M Grau, Rondi M Kauffmann, Raeshell S Sweeting, Kandace Spotanski, Sheila H Ridner, Manus J Donahue
BACKGROUND: Breast cancer treatment-related lymphedema (BCRL) arises from a mechanical insufficiency following cancer therapies. Early BCRL detection and personalized intervention require an improved understanding of the physiological processes that initiate lymphatic impairment. Here, internal magnetic resonance imaging (MRI) measures of the tissue microenvironment were paired with clinical measures of tissue structure to test fundamental hypotheses regarding structural tissue and muscle changes after the commonly used therapeutic intervention of manual lymphatic drainage (MLD)...
March 2017: Lymphatic Research and Biology
https://www.readbyqxmd.com/read/28319687/effects-of-subclinical-depression-anxiety-and-somatization-on-brain-structure-in-healthy-subjects
#11
Bianca Besteher, Christian Gaser, Kerstin Langbein, Maren Dietzek, Heinrich Sauer, Igor Nenadić
BACKGROUND: Dimensional approaches in highly prevalent psychiatric disorders like depression or anxiety could lead to a better understanding of pathogenesis and advantages in early detection and prevention. In an effort to better understand associations of brain structural variation across the depression/anxiety spectra, we investigated minor subclinical symptoms in a non-clinical healthy population. METHODS: We studied 177 healthy subjects from the community, who underwent high-resolution T1-weighted 3T MRI and completed the symptom-checklist-90 (SCL-90-R)...
March 16, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28319177/radiological-features-of-primitive-neuroectodermal-tumors-in-intra-abdominal-and-retroperitoneal-regions-a-series-of-18-cases
#12
Xiaoping Yi, Wenguang Liu, Youming Zhang, Desheng Xiao, Hongling Yin, Xueying Long, Li Li, Hongyan Zai, Minfeng Chen, Wenzheng Li, Lunquan Sun
OBJECTIVES: To characterize the imaging and clinicopathological features of primitive neuroectodermal tumors (PNETs) arising in intra-abdominal and retroperitoneal regions. METHODS: Eighteen patients with histopathologically proven intra-abdominal and retroperitoneal PNET were enrolled; computed tomography was performed for all cases, and magnetic resonance imaging was performed for a single case. Typical computed tomography and magnetic resonance imaging findings, including morphology, texture and enhancement features, as well as clinicopathological characteristics and prognosis data were retrospectively analyzed...
2017: PloS One
https://www.readbyqxmd.com/read/28318917/radiological-changes-with-magnetic-resonance-imaging-and-computed-tomography-after-irradiating-minipig-mandibles-the-role-of-t2-spir-mixed-signal-intensities-in-the-detection-of-osteoradionecrosis
#13
Lucas J Poort, Alida A Postma, Annika A R Stadler, Roland A Böckmann, Frank J Hoebers, Peter A W H Kessler
PURPOSE: Radiotherapy in the head and neck can induce several radiologically detectable changes in bone, osteoradionecrosis (ORN) among them. The purpose is to investigate radiological changes in mandibular bone after irradiation with various doses with and without surgery and to determine imaging characteristics of radiotherapy and ORN in an animal model. MATERIALS AND METHODS: Sixteen Göttingen minipigs were divided into groups and were irradiated with two fractions with equivalent doses of 0, 25, 50 and 70 Gray...
February 12, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28317976/albumin-based-nanoparticles-loaded-with-hydrophobic-gadolinium-chelates-as-t1-t2-dual-mode-contrast-agents-for-accurate-liver-tumor-imaging
#14
Lirong Wang, Hongyu Lin, Lingceng Ma, Jianbin Jin, Taipeng Shen, Ruixue Wei, Xiaomin Wang, Hua Ai, Zhong Chen, Jinhao Gao
Magnetic resonance contrast agents with T1-T2 dual mode contrast capability have attracted considerable interest because they offer complementary and synergistic diagnostic information, leading to high imaging sensitivity and accurate diagnosis. Here, we reported a facile strategy to construct albumin based nanoparticles loaded with hydrophobic gadolinium chelates by hydrophobic interaction for magnetic resonance imaging (MRI). We synthesized a glycyrrhetinic acid-containing Gd-DOTA derivative (GGD) and loaded GGD molecules into BSA nanoparticles to form GGD-BSA nanoparticles (GGD-BSA NPs)...
March 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28317276/important-considerations-in-lesion-symptom-mapping-illustrations-from-studies-of-word-comprehension
#15
Hinna Shahid, Rajani Sebastian, Tatiana T Schnur, Taylor Hanayik, Amy Wright, Donna C Tippett, Julius Fridriksson, Chris Rorden, Argye E Hillis
Lesion-symptom mapping is an important method of identifying networks of brain regions critical for functions. However, results might be influenced substantially by the imaging modality and timing of assessment. We tested the hypothesis that brain regions found to be associated with acute language deficits depend on (1) timing of behavioral measurement, (2) imaging sequences utilized to define the "lesion" (structural abnormality only or structural plus perfusion abnormality), and (3) power of the study. We studied 191 individuals with acute left hemisphere stroke with MRI and language testing to identify areas critical for spoken word comprehension...
March 20, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28317116/anatomical-segmentation-of-the-human-medial-prefrontal-cortex
#16
M Córcoles-Parada, Ncj Müller, M Ubero, V M Serrano-Del-Pueblo, F Mansilla, P Marcos-Rabal, E Artacho-Pérula, M Dresler, R Insausti, G Fernández, M Muñoz-López
The medial prefrontal areas 32, 24, 14, and 25 (mPFC) form part of the limbic memory system, but little is known about their functional specialization in humans. To add anatomical precision to structural and functional MRI data, we aimed to identify these mPFC subareas in histological preparations of human brain tissue, determine sulci most consistently related with mPFC areal boundaries, and use these sulci to delineate mPFC areas in MRIs. To achieve this, we obtained 3D MRI data from 11 ex vivo hemispheres and processed them for cyto- and myelo-architectonic analysis...
March 20, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28316992/a-combined-random-forests-and-active-contour-model-approach-for-fully-automatic-segmentation-of-the-left-atrium-in-volumetric-mri
#17
Chao Ma, Gongning Luo, Kuanquan Wang
Segmentation of the left atrium (LA) from cardiac magnetic resonance imaging (MRI) datasets is of great importance for image guided atrial fibrillation ablation, LA fibrosis quantification, and cardiac biophysical modelling. However, automated LA segmentation from cardiac MRI is challenging due to limited image resolution, considerable variability in anatomical structures across subjects, and dynamic motion of the heart. In this work, we propose a combined random forests (RFs) and active contour model (ACM) approach for fully automatic segmentation of the LA from cardiac volumetric MRI...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28316255/a-bayesian-double-fusion-model-for-resting-state-brain-connectivity-using-joint-functional-and-structural-data
#18
Hakmook Kang, Hernando Ombao, Christopher Fonnesbeck, Zhaohua Ding, Victoria L Morgan
Current approaches separately analyze concurrently acquired diffusion tensor imaging (DTI) and functional magnetic resonance imaging (fMRI) data. The primary limitation of these approaches is that they do not take advantage of the information from DTI that could potentially enhance estimation of resting state functional connectivity (FC) between brain regions. To overcome this limitation, we develop a Bayesian hierarchical spatio-temporal model that incorporates structural connectivity into estimating FC. In our proposed approach, structural connectivity (SC) based on DTI data is used to construct an informative prior for functional connectivity based on resting state fMRI data via the Cholesky decomposition...
March 19, 2017: Brain Connectivity
https://www.readbyqxmd.com/read/28315998/chordoid-glioma-of-the-third-ventricle-report-of-a-rapidly-progressive-case
#19
Amalie A Erwood, Jose E Velazquez-Vega, Stewart Neill, David A Solomon, Nicholas Butowski, Adam Nowlan, Erin Dunbar, Daniel J Brat
Chordoid gliomas are slowly growing third ventricular tumors that can be challenging to manage clinically. Rapid progression causing death has not been previously reported for this tumor type. We present and discuss a case of chordoid glioma that arose in a 46-year-old female who presented with progressive fatigue, headache, and altered mental status, attributable to severe hydrocephalus caused by a third ventricular mass. She underwent urgent subtotal resection and ventriculo-peritoneal shunt placements. Post-operative MRI noted residual tumor in the anterior resection cavity...
March 18, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/28315957/right-sided-dominance-of-the-bilateral-vestibular-system-in-the-upper-brainstem-and-thalamus
#20
Marianne Dieterich, V Kirsch, T Brandt
MRI diffusion tensor imaging tractography was performed on the bilateral vestibular brainstem pathways, which run from the vestibular nuclei via the paramedian and posterolateral thalamic subnuclei to the parieto-insular vestibular cortex. Twenty-one right-handed healthy subjects participated. Quantitative analysis revealed a rope-ladder-like system of vestibular pathways in the brainstem with crossings at pontine and mesencephalic levels. Three structural types of right-left fiber distributions could be delineated: (1) evenly distributed pathways at the lower pontine level from the vestibular nuclei to the pontine crossing, (2) a moderate, pontomesencephalic right-sided lateralization between the pontine and mesencephalic crossings, and (3) a further increase of the right-sided lateralization above the mesencephalic crossing leading to the thalamic vestibular subnuclei...
March 18, 2017: Journal of Neurology
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