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https://www.readbyqxmd.com/read/28545048/a-distribution-model-of-functional-connectome-based-on-criticality-and-energy-constraints
#1
Kosuke Takagi
The analysis of the network structure of the functional connectivity data constructed from fMRI images provides basic information about functions and features of the brain activity. We focus on the two features which are considered as relevant to the brain activity, the criticality and the constraint regarding energy consumptions. Within a wide variety of complex systems, the critical state occurs associated with a phase transition between distinct phases, random one and order one. Although the hypothesis that human brain activity is also in a state of criticality is supported by some experimental results, it still remains controversial...
2017: PloS One
https://www.readbyqxmd.com/read/28544981/synthesis-and-in%C3%A2-vitro-evaluation-of-new-fluorinated-quinoline-derivatives-with-high-affinity-for-pde5-towards-the-development-of-new-pet-neuroimaging-probes
#2
Jianrong Liu, Aurélie Maisonial-Besset, Barbara Wenzel, Damien Canitrot, Ariane Baufond, Jean-Michel Chezal, Peter Brust, Emmanuel Moreau
The increasing incidence of Alzheimer's disease (AD) worldwide is a major public health problem. Current treatments provide only palliative solutions with significant side effects. Therefore, new efficient treatment options and novel early diagnosis tools are urgently needed. Recently, strong pre-clinical evidences suggested that phosphodiesterase 5 (PDE5) may be clinically relevant both as biomarker and drug-target in AD. In this study, we intended to develop a new radiofluorinated tracer for the visualisation of PDE5 in brain using PET imaging...
April 19, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28544954/long-term-attention-deficits-combined-with-subcortical-and-cortical-structural-central-nervous-system-alterations-in-young-adults-born-small-for-gestational-age
#3
Sabrina Suffren, Diego Angulo, Yang Ding, Pablo Reyes, Jorge Marin, Jose T Hernandez, Nathalie Charpak, Gregory A Lodygensky
BACKGROUND: Being born small for gestational age has been associated with neurodevelopmental disabilities and smaller gray matter volumes in childhood. However, it is not known if these changes persist in adults and whether SGA has any impact on attention memory and IQ. AIMS: The goal of this study was to evaluate the association between birth weight and gray matter anatomy in adults born small for gestational age at term, in relation to IQ, attention and memory...
May 22, 2017: Early Human Development
https://www.readbyqxmd.com/read/28544830/assessment-of-contributors-of-aortopathy-and-subclinical-left-ventricular-dysfunction-in-normally-functioning-bicuspid-aortic-valves
#4
Kamil Tuluce, Selcen Yakar Tuluce, Ersin Cagri Simsek, Serdar Bayata, Cem Nazli
BACKGROUND: Left ventricular (LV) function and the dimensions of aortic valves from normally functioning bicuspid aortic valve (BAV) patients were compared with those of healthy control patients. A comparison between patients with antero-posterior BAV (BAV-AP) or right-left BAV (BAV-RL) was also performed, and the determinants of aortopathy and LV function were investigated. METHODS: Sixty-eight patients with aortic velocities <2 m/s and trivial or mild aortic regurgitation were included in the study...
January 2017: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28544826/preoperative-computed-tomography-scan-analysis-of-interleaflets-triangles-to-guide-aortic-root-repair-procedures
#5
Claudia Romagnoni, Andrea Mangini, Monica Contino, Rubina Rosa, Sonia Ippolito, Guido Gelpi, Carlo Antona
BACKGROUND: Stabilization of the ventriculo-aortic junction (VAJ) is gaining increasing interest in the context of aortic valve repair, since its dilation is a well-recognized risk factor for long-term repair failure. Interleaflets triangles are key elements of the VAJ, but cannot be completely visualized using echocardiography. A three-dimensional (3D) reconstruction of electrocardiogram-triggered computed tomography (CT) scan images allows an analysis of the real dimensions and anatomic characteristics of the subcommissural triangles...
January 2017: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28544809/robotic-radiosurgery-of-head-and-neck-paragangliomas-a-single-institution-experience
#6
İlker Tosun, Banu Atalar, Bilgehan Şahin, Görkem Güngör, Gökhan Aydin, Bülent Yapici, Enis Özyar
AIM: CyberKnife(®) is a robotic stereotactic radiotherapy system. The aim of this study is to evaluate the effectiveness and the safety of CyberKnife(®) on treating head and neck paragangliomas and to report our results. METHODS: Between March 2009 and June 2014, 12 patients with head and neck paragangliomas have been referred to our clinic: in three cases had jugular paragangliomas, five cases had carotid body paragangliomas and three cases had tympanic paragangliomas...
May 24, 2017: Asia-Pacific Journal of Clinical Oncology
https://www.readbyqxmd.com/read/28544729/comparative-study-of-two-chemical-protocols-for-creating-white-spot-lesions-an-in-vitro-fluorecam-evaluation
#7
Moufida Abufarwa, Amal Noureldin, Phillip M Campbell, Peter H Buschang
AIM: The aim of the present study was to compare the effectiveness and practicality of two commonly-used protocols for white spot lesion creation. METHODS: Sound posterior human teeth were sectioned into halves and randomly allocated into two groups (n=20). Using the FluoreCam system, the enamel surfaces were imaged under standardized conditions, and baseline data (area, intensity, and impact) were recorded. Specimens were covered with an acid-resistant polish, leaving a 2×6-mm enamel window...
May 23, 2017: Journal of Investigative and Clinical Dentistry
https://www.readbyqxmd.com/read/28544659/intranasal-distribution-and-clearance-of-thermoreversible-gel-in-an-animal-model
#8
Ji Eun Choi, Ki Ryung Kim, Yangseop Noh, Won-Ho Chung, Yang-Sun Cho, Seung-Kyu Chung, Hun-Jong Dhong, Hyo Yeol Kim
BACKGROUND: Poloxamer 407 (P407) has been investigated for an intranasal drug delivery system. However, there is little known about the distribution and clearance of intranasally applied P407. The purpose of this study was to evaluate the distribution and clearance time of P407 in an animal model. METHODS: Five male pigs were administered the experimental solution (18% of P407 with 0.01% of fluorescein) and the control solution (normal saline with 0.01% of fluorescein) into their right and left nasal cavity, respectively...
May 23, 2017: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/28544582/evaluation-by-medical-students-of-the-educational-value-of-multi-material-and-multi-colored-three-dimensional-printed-models-of-the-upper-limb-for-anatomical-education
#9
Sreenivasulu Reddy Mogali, Wai Yee Yeong, Heang Kuan Joel Tan, Gerald Jit Shen Tan, Peter H Abrahams, Nabil Zary, Naomi Low-Beer, Michael Alan Ferenczi
For centuries, cadaveric material has been the cornerstone of anatomical education. For reasons of changes in curriculum emphasis, cost, availability, expertise, and ethical concerns, several medical schools have replaced wet cadaveric specimens with plastinated prosections, plastic models, imaging, and digital models. Discussions about the qualities and limitations of these alternative teaching resources are on-going. We hypothesize that three-dimensional printed (3DP) models can replace or indeed enhance existing resources for anatomical education...
May 19, 2017: Anatomical Sciences Education
https://www.readbyqxmd.com/read/28544302/predictors-of-delay-to-cystoscopy-and-adequacy-of-investigations-in-patients-with-haematuria
#10
Brian Ngo, Nathan Papa, Marlon Perera, Damien Bolton, Shomik Sengupta
OBJECTIVE: To identify factors that impact on the timeliness and adequacy of haematuria evaluation. PATIENTS AND METHODS: We undertook a retrospective cohort study identifying patients who underwent cystoscopy for investigation of haematuria at our institution between 1 January 2015 and 31 December 2015. Data on patient demographics, smoking status, anticoagulation, type of haematuria and referring clinician were collected. Exclusion criteria included patient age <18 years, known history of bladder/urinary tract/renal cancer, cystoscopy for indications other than haematuria and unknown date of urology consultation...
May 2017: BJU International
https://www.readbyqxmd.com/read/28544294/factors-affecting-the-timeliness-and-adequacy-of-haematuria-assessment-in-bladder-cancer-a-systematic-review
#11
REVIEW
Brian Ngo, Marlon Perera, Nathan Papa, Damien Bolton, Shomik Sengupta
OBJECTIVES: To review the literature to identify factors affecting haematuria assessment in bladder cancer. METHODS: We performed a systematic review in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Publications indexed in EMBASE and Medline (PubMed) in March 2016 were searched, using the keywords 'hematuria', 'urinary bladder neoplasm(s)' and 'bladder tumor'. Studies evaluating the timeliness and adequacy of haematuria assessment in the context of bladder cancer were included...
May 2017: BJU International
https://www.readbyqxmd.com/read/28544269/a-novel-approach-for-early-evaluation-of-orthodontic-process-by-a-numerical-thermo-mechanical-analysis
#12
Z Heidary, A Mojra, M Shirazi, M Bazargan
The main objective of this paper is to propose a novel method that provides an opportunity to evaluate an orthodontic process at early phase of the treatment. This was accomplished by finding out a correlation between the applied orthodontic force and thermal variations in the tooth structure. To this end, geometry of the human tooth surrounded by the connective soft tissue called the periodontal ligament and the bone was constructed by employing dental CT scan images of a specific case. The periodontal ligament was modeled by finite strain viscoelastic model through a nonlinear stress-strain relation (hyperelasticity) and nonlinear stress-time relation (viscoelasticity)...
May 21, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28544218/genome-wide-mediation-analysis-of-psychiatric-and-cognitive-traits-through-imaging-phenotypes
#13
Xuan Bi, Liuqing Yang, Tengfei Li, Baisong Wang, Hongtu Zhu, Heping Zhang
Heritability is well documented for psychiatric disorders and cognitive abilities which are, however, complex, involving both genetic and environmental factors. Hence, it remains challenging to discover which and how genetic variations contribute to such complex traits. In this article, they propose to use mediation analysis to bridge this gap, where neuroimaging phenotypes were utilized as intermediate variables. The Philadelphia Neurodevelopmental Cohort was investigated using genome-wide association studies (GWAS) and mediation analyses...
May 22, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28544133/autoimmune-encephalitis-associated-with-voltage-gated-potassium-channels-complex-and-leucine-rich-glioma-inactivated-1-antibodies-a-national-cohort-study
#14
M Celicanin, M Blaabjerg, C Maersk-Moller, S Beniczky, L Marner, C Thomsen, F W Back, D Kondziella, H Andersen, F Somnier, Z Illes, L H Pinborg
BACKGROUND AND PURPOSE: The aim of this study was to describe clinical and paraclinical characteristics of all Danish patients who tested positive for anti-voltage-gated potassium channels (VGKC)-complex, anti-leucine-rich glioma-inactivated 1 (LGI1) and anti-contactin-associated protein-2 antibodies in the serum/cerebrospinal fluid between 2009 and 2013 with follow-up interviews in 2015 and 2016. METHODS: We evaluated antibody status, symptoms leading to testing, course of disease, suspected diagnosis and time of admission as well as diagnosis and treatment...
May 25, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/28544025/phase-imaging-of-axonal-integrity-of-cranial-corticospinal-tract-in-experimental-spinal-cord-injury-at-9-4t
#15
Genxia He, Junchao Qian
It was known that Spinal cord injury (SCI) leads to neuronal cell death, axonal damage and demyelination, and often results in severe functional loss. Noninvasive imaging of axonal integrity may hold great importance in clinic. This study evaluated the role of phase imaging in detection of axonal integrity of cranial corticospinal tract after spinal cord injury. Quantitative MR phase imaging and diffusion tensor imaging were performed on a group of rats prior to and after spinal cord injury at 9.4 T in this study...
May 23, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28543966/development-of-a-quantitative-assessment-method-of-pigmentary-skin-disease-using-ultraviolet-optical-imaging
#16
Onseok Lee, Sunup Park, Jaeyoung Kim, Chilhwan Oh
BACKGROUND/PURPOSE: The visual scoring method has been used as a subjective evaluation of pigmentary skin disorders. Severity of pigmentary skin disease, especially melasma, is evaluated using a visual scoring method, the MASI (melasma area severity index). This study differentiates between epidermal and dermal pigmented disease. The study was undertaken to determine methods to quantitatively measure the severity of pigmentary skin disorders under ultraviolet illumination. METHODS: The optical imaging system consists of illumination (white LED, UV-A lamp) and image acquisition (DSLR camera, air cooling CMOS CCD camera)...
May 21, 2017: Skin Research and Technology
https://www.readbyqxmd.com/read/28543961/automated-low-contrast-pattern-recognition-algorithm-for-magnetic-resonance-image-quality-assessment
#17
Morgan Ehman, Zhonghao Bao, Scott A Stiving, Mallik Kasam, Dianna Lanners, Teresa Peterson, Renee Jonsgaard, Rickey Carter, Kiaran P McGee
PURPOSE: Low contrast (LC) detectability is a common test criterion for diagnostic radiologic quality control (QC) programs. Automation of this test is desirable in order to reduce human variability and to speed up analysis. However, automation is challenging due to the complexity of the human visual perception system and the ability to create algorithms that mimic this response. This paper describes the development and testing of an automated LC detection algorithm for use in the analysis of magnetic resonance (MR) images of the American College of Radiology (ACR) QC phantom...
May 24, 2017: Medical Physics
https://www.readbyqxmd.com/read/28543952/structural-signature-of-classical-versus-late-onset-friedreich-s-ataxia-by-multimodality-brain-mri
#18
Thiago Junqueira R Rezende, Alberto Rolim M Martinez, Ingrid Faber, Karen Girotto, José Luiz Pedroso, Orlando G Barsottini, Iscia Lopes-Cendes, Fernando Cendes, Andreia V Faria, Marcondes C França
INTRODUCTION: Friedreich's ataxia (FRDA) is the most common autosomal-recessive ataxia worldwide. It is characterized by early onset, sensory abnormalities, and slowly progressive ataxia. However, some individuals manifest the disease after the age of 25 years and are classified as late-onset FRDA (LOFA). Therefore, we propose a transversal multimodal MRI-based study to investigate which anatomical substrates are involved in classical (cFRDA) and LOFA. METHODS: We enrolled 36 patients (13 with LOFA) and 29 healthy controls...
May 23, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28543874/ex-vivo-magnetic-resonance-imaging-using-hyaluronic-acid-fillers-differences-between-monophasic-and-biphasic-fillers
#19
M J Kim, W-J Moon, M S Hur, S H Han, Y W Lee, Y B Choe, K J Ahn
BACKGROUND/PURPOSE: Hyaluronic acid (HA) is an anionic, non-sulfated glycosaminoglycan distributed throughout the human skin and injectable HA fillers are the most commonly used in aesthetic field. This study aimed to determine if differences in physical characteristics of HA products (monophasic or biphasic fillers) affect the patterns of magnetic resonance imaging (MRI). METHODS: Twenty biphasic fillers and nine monophasic fillers were obtained from a commercial source, and examined with a 3...
May 25, 2017: Skin Research and Technology
https://www.readbyqxmd.com/read/28543843/white-matter-biomarkers-from-fast-protocols-using-axially-symmetric-diffusion-kurtosis-imaging
#20
Brian Hansen, Ahmad R Khan, Noam Shemesh, Torben E Lund, Ryan Sangill, Simon F Eskildsen, Leif Østergaard, Sune N Jespersen
White matter tract integrity (WMTI) can characterize brain microstructure in areas with highly aligned fiber bundles. Several WMTI biomarkers have now been validated against microscopy and provided promising results in studies of brain development and aging, as well as in a number of brain disorders. Currently, WMTI is mostly used in dedicated animal studies and clinical studies of slowly progressing diseases, and has not yet emerged as a routine clinical tool. To this end, a less data intensive experimental method would be beneficial by enabling high resolution validation studies, and ease clinical applications by speeding up data acquisition compared with typical diffusion kurtosis imaging (DKI) protocols utilized as part of WMTI imaging...
May 22, 2017: NMR in Biomedicine
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