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https://www.readbyqxmd.com/read/28419591/application-of-spin-echoes-in-the-regime-of-weak-dephasing-to-t1-mapping-of-the-lung
#1
Jakob Assländer, Steffen J Glaser, Jürgen Hennig
PURPOSE: This work presents an approach to mapping the entire lung's proton density and T1 within a single breath-hold and analyzes the apparent T1 when exciting with a spin echo generating pulse in comparison to a standard gradient echo acquisition. METHODS: An inversion-recovery SNAPSHOT-FLASH sequence with a stack-of-stars k-space readout with a golden angle increment was modified to use a spin echo generating radiofrequency-pulse for excitation. Data of five volunteers were acquired on a 3T scanner and image reconstruction was performed by an iterative algorithm adopted from MR-Fingerprinting...
April 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28417080/applying-a-systems-approach-to-thyroid-physiology-looking-at-the-whole-with-a-mitochondrial-perspective-instead-of-judging-single-tsh-values-or-why-we-should-know-more-about-mitochondria-to-understand-metabolism
#2
REVIEW
Roy Moncayo, Helga Moncayo
Classical thinking in endocrine physiology squeezes our diagnostic handling into a simple negative feedback mechanism with a controller and a controlled variable. In the case of the thyroid this is reduced to TSH and fT3 and fT4, respectively. The setting of this tight notion has no free space for any additions. In this paper we want to challenge this model of limited application by proposing a construct based on a systems approach departing from two basic considerations. In first place since the majority of cases of thyroid disease develop and appear during life it has to be considered as an acquired condition...
June 2017: BBA Clinical
https://www.readbyqxmd.com/read/28416042/earthquakes-fuel-crisis-power-outages-and-health-care-in-nepal-implications-for-the-future
#3
Bipin Adhikari, Shiva Raj Mishra, Sujan Babu Marahatta, Nils Kaehler, Kumar Paudel, Janak Adhikari, Shristi Raut
Earthquakes are a major natural calamity with pervasive effects on human life and nature. Similar effects are mimicked by man-made disasters such as fuel crises and power outages in developing countries. Natural and man-made disasters can cause intangible human suffering and often leave scars of lifelong psychosocial damage. Lessons from these disasters are frequently not implemented. The main objective of this study was to review the effects of the 2015 earthquakes, fuel crisis, and power outages on the health services of Nepal and formulate recommendations for the future...
April 18, 2017: Disaster Medicine and Public Health Preparedness
https://www.readbyqxmd.com/read/28410982/ehr-based-phenotyping-bulk-learning-and-evaluation
#4
Po-Hsiang Chiu, George Hripcsak
In data-driven phenotyping, a core computational task is to identify medical concepts and their variations from sources of electronic health records (EHR) to stratify phenotypic cohorts. A conventional analytic framework for phenotyping largely uses a manual knowledge engineering approach or a supervised learning approach where clinical cases are represented by variables encompassing diagnoses, medicinal treatments and laboratory tests, among others. In such a framework, tasks associated with feature engineering and data annotation remain a tedious and expensive exercise, resulting in poor scalability...
April 11, 2017: Journal of Biomedical Informatics
https://www.readbyqxmd.com/read/28410140/pathway-based-classification-of-breast-cancer-subtypes
#5
Alex Graudenzi, Claudia Cava, Gloria Bertoli, Bastian Fromm, Kjersti Flatmark, Giancarlo Mauri, Isabella Castiglioni
Cancer heterogeneity represents a major hurdle in the development of effective theranostic strategies, as it prevents to devise unique and maximally efficient diagnostic, prognostic and therapeutic procedures even for patients affected by the same tumor type. Computational techniques can nowadays leverage the huge and ever increasing amount of (epi)genomic data to tackle this problem, therefore providing new and valuable instruments for decision support to biologists and pathologists, in the broad sphere of precision medicine...
June 1, 2017: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28410120/snp_tata_comparator-genomewide-landmarks-for-preventive-personalized-medicine
#6
Mikhail Ponomarenko, Dmitry Rasskazov, Irina Chadaeva, Ekaterina Sharypova, Petr Ponomarenko, Olga Arkova, Elena Kashina, Nikita Ivanisenko, Dmitry Zhechev, Ludmila Savinkova, Nikolay Kolchanov
Year after year, conditions, quality, and duration of human lives have been improving due to the progress of science, technology, education, and medicine, which however has a downside. Owing to improvement in children's nutrition, developmental acceleration occurs that imbalances a child's system. Because of virtual worlds of the Internet, social experience of teenagers expands and clashes with puberty of adolescents. Due to the comfort of cities, urbanization emerges and causes stress to adults because of artificial light, noise, pollution, violations of personal space, and family disruption...
June 1, 2017: Frontiers in Bioscience (Scholar Edition)
https://www.readbyqxmd.com/read/28409625/privileged-structural-motif-detection-and-analysis-using-generative-topographic-maps
#7
Shilva Kayastha, Dragos Horvath, Erik Gilberg, Michael Gütschow, Jürgen Bajorath, Alexandre Varnek
Identification of "privileged structural motifs" associated with specific target families is of particular importance for designing novel bioactive compounds. Here, we demonstrate that they can be extracted from a data distribution represented on a two-dimensional map obtained by Generative Topographic Mapping (GTM) . In GTM, structurally related molecules are grouped together on the map. Zones of the map preferentially populated by target-specific compounds were delineated, which helped to capture common substructures on the basis of which these compounds were grouped together by the GTM...
April 14, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28401643/ultrafast-compartmentalized-relaxation-time-mapping-with-linear-algebraic-modeling
#8
Yi Zhang, Xiaoyang Liu, Jinyuan Zhou, Paul A Bottomley
PURPOSE: To dramatically accelerate compartmental-average longitudinal (T1 ) and transverse (T2 ) relaxation measurements using the minimal-acquisition linear algebraic modeling (SLAM) method, and to validate it in phantoms and humans. METHODS: Relaxation times were imaged at 3 Tesla in phantoms, in the abdomens of six volunteers, and in six brain tumor patients using standard inversion recovery and multi-spin-echo sequences. k-space was fully sampled to provide reference T1 and T2 measurements, and SLAM was performed using a limited set of phase encodes from central k-space...
April 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28400153/spatiotemporal-diversification-of-intrapatient-genomic-clones-and-early-drug-development-concepts-realize-the-roadmap-of-precision-cancer-medicine
#9
REVIEW
Dimitrios H Roukos
The unmet clinical needs of high relapse and cancer-related death rates are reflected by the poor understanding of the genome-wide mutational landscape and molecular mechanisms orchestrating therapeutic resistance. Emerging potential solutions to this challenge include the exploration of cancer genome dynamic evolution in time and space. Breakthrough next-generation sequencing (NGS) applications including multiregional NGS for intratumor heterogeneity identification, repeated cell-free DNA/circulating tumor DNA-NGS for detecting circulating genomic subclones and their comparison to reveal intrapatient heterogeneity (IPH) could identify the dynamic emergence of resistant subclones in the neoadjuvant, adjuvant and metastatic setting...
April 8, 2017: Drug Discovery Today
https://www.readbyqxmd.com/read/28399476/geodesic-shape-regression-with-multiple-geometries-and-sparse-parameters
#10
James Fishbaugh, Stanley Durrleman, Marcel Prastawa, Guido Gerig
Many problems in medicine are inherently dynamic processes which include the aspect of change over time, such as childhood development, aging, and disease progression. From medical images, numerous geometric structures can be extracted with various representations, such as landmarks, point clouds, curves, and surfaces. Different sources of geometry may characterize different aspects of the anatomy, such as fiber tracts from DTI and subcortical shapes from structural MRI, and therefore require a modeling scheme which can include various shape representations in any combination...
April 5, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28388050/cns-physicochemical-property-space-shaped-by-a-diverse-set-of-molecules-with-experimentally-determined-exposure-in-the-mouse-brain
#11
Zoran Rankovic
Understanding the "limits and boundaries" of the central nervous system (CNS) property space is a critical aspect of modern CNS drug design. Medicinal chemists are often guided by the physicochemical properties of marketed CNS drugs, which are heavily biased toward "traditional" aminergic targets and commonly described as small lipophilic amines. This miniperspective describes the statistical analysis of the calculated physicochemical properties for a diverse set of ligands for mostly "nontraditional" CNS targets and classified as either "brain penetrant" or "peripherally restricted" on the basis of the experimental mouse brain exposure...
April 7, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28384888/perception-of-learning-environment-among-undergraduate-medical-students-in-two-different-medical-schools-through-dreem-and-jhles-questionnaire
#12
Parama Sengupta, Abhishek Sharma, Nina Das
INTRODUCTION: Assessment of learning environment is essential to assess the acceptability of the curriculum among students. Several tools are available to assess undergraduate medical students' perception of learning environment. Dundee Ready Education Environment Measure (DREEM) questionnaire is the most commonly used tool. Here, we have used both the widely used DREEM questionnaire and a relatively new questionnaire Johns Hopkins Learning Environment Scale (JHLES). AIM: Assessment of students' perception of learning environment of two eastern Indian medical schools using DREEM and JHLES questionnaire...
February 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28383764/risk-factors-for-radiographic-joint-space-narrowing-and-patient-reported-outcomes-of-post-traumatic-osteoarthritis-after-acl-reconstruction-data-from-the-moon-cohort
#13
Morgan H Jones, Kurt P Spindler
The Multicenter Orthopaedic Outcomes Network (MOON) is an NIH-funded prospective, longitudinal cohort of over 3500 patients who have undergone anterior cruciate ligament reconstruction (ACLR) by 14 sports medicine surgeons at 7 academic medical centers. Patient reported outcome questionnaires (PRO's) are completed at baseline and multiple timepoints after surgery, and a nested cohort of patients return for radiographs to assess the development of joint space changes. We review the risk factors for worse patient reported outcomes, the predictors of clinically significant symptoms of post-traumatic osteoarthritis (PTOA), and the factors associated with more radiographic joint space narrowing...
April 6, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28383245/exploring-the-chemistry-of-genetic-information-storage-and-propagation-through-polymerase-engineering
#14
Gillian Houlihan, Sebastian Arangundy-Franklin, Philipp Holliger
Nucleic acids are a distinct form of sequence-defined biopolymer. What sets them apart from other biopolymers such as polypeptides or polysaccharides is their unique capacity to encode, store, and propagate genetic information (molecular heredity). In nature, just two closely related nucleic acids, DNA and RNA, function as repositories and carriers of genetic information. They therefore are the molecular embodiment of biological information. This naturally leads to questions regarding the degree of variation from this seemingly ideal "Goldilocks" chemistry that would still be compatible with the fundamental property of molecular heredity...
April 6, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28377682/body-of-evidence-integrating-eduard-pernkopf-s-atlas-into-a-librarian-led-medical-humanities-seminar
#15
Keith C Mages, Linda A Lohr
BACKGROUND: Anatomical subjects depicted in Eduard Pernkopf's richly illustrated Topographische Anatomie des Menschen may be victims of the Nazi regime. Special collections librarians in the history of medicine can use this primary resource to initiate dialogs about ethics with medical students. CASE PRESENTATION: Reported here is the authors' use of Pernkopf's Atlas in an interactive medical humanities seminar designed for third-year medical students. Topical articles, illustrations, and interviews introduced students to Pernkopf, his Atlas, and the surrounding controversies...
April 2017: Journal of the Medical Library Association: JMLA
https://www.readbyqxmd.com/read/28370494/tailored-spiral-in-out-spectral-spatial-water-suppression-pulses-for-magnetic-resonance-spectroscopic-imaging
#16
Jun Ma, Carrie Wismans, Zhipeng Cao, Dennis W J Klomp, Jannie P Wijnen, William A Grissom
PURPOSE: To develop short water suppression sequences for 7 T magnetic resonance spectroscopic imaging, with mitigation of subject-specific transmit RF field ( B1+) inhomogeneity. METHODS: Patient-tailored spiral in-out spectral-spatial saturation pulses were designed for a three-pulse WET water suppression sequence. The pulses' identical spatial subpulses were designed using patient-specific B1+ maps and a spiral in-out excitation k-space trajectory. The subpulse train was weighted by a spectral envelope that was root-flipped to minimize peak RF demand...
March 31, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28370409/slice-profile-effects-on-ncpmg-ss-fse
#17
Eric K Gibbons, Patrick Le Roux, John M Pauly, Adam B Kerr
PURPOSE: To determine the effects of the RF refocusing pulse profile on the magnitude of the transverse signal smoothness throughout the echo train in non-Carr-Purcell-Meiboom-Gill (nCPMG) single-shot fast spin echo (SS-FSE) imaging and to design an RF refocusing pulse that provides improved signal stability. THEORY AND METHODS: nCPMG SS-FSE quadratic phase modulation requires sufficiently high and uniform refocusing flip angle to achieve a stable signal. Typically, refocusing pulses used in SS-FSE sequences are designed for minimum duration to minimize echo spacing and as a consequence have poor selectivity...
March 31, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28370298/accelerated-radial-diffusion-spectrum-imaging-using-a-multi-echo-stimulated-echo-diffusion-sequence
#18
Steven H Baete, Fernando E Boada
PURPOSE: Diffusion spectrum imaging (DSI) provides us non-invasively and robustly with anatomical details of brain microstructure. To achieve sufficient angular resolution, DSI requires a large number of q-space samples, leading to long acquisition times. This need is mitigated here by combining the beneficial properties of Radial q-space sampling for DSI with a Multi-Echo Stimulated Echo Sequence (MESTIM). METHODS: Full 2D k-spaces for each of several q-space samples, along the same radially outward line in q-space, are acquired in one readout train with one spin and three stimulated echoes...
March 31, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28370252/fetal-cardiac-cine-imaging-using-highly-accelerated-dynamic-mri-with-retrospective-motion-correction-and-outlier-rejection
#19
Joshua F P van Amerom, David F A Lloyd, Anthony N Price, Maria Kuklisova Murgasova, Paul Aljabar, Shaihan J Malik, Maelene Lohezic, Mary A Rutherford, Kuberan Pushparajah, Reza Razavi, Joseph V Hajnal
PURPOSE: Development of a MRI acquisition and reconstruction strategy to depict fetal cardiac anatomy in the presence of maternal and fetal motion. METHODS: The proposed strategy involves i) acquisition and reconstruction of highly accelerated dynamic MRI, followed by image-based ii) cardiac synchronization, iii) motion correction, iv) outlier rejection, and finally v) cardiac cine reconstruction. Postprocessing entirely was automated, aside from a user-defined region of interest delineating the fetal heart...
April 3, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28369256/entropy-based-consensus-clustering-for-patient-stratification
#20
Hongfu Liu, Rui Zhao, Hongsheng Fang, Feixiong Cheng, Yun Fu, Yang-Yu Liu
Motivation: Patient stratification or disease subtyping is crucial for precision medicine and personalized treatment of complex diseases. The increasing availability of high-throughput molecular data provides a great opportunity for patient stratification. Many clustering methods have been employed to tackle this problem in a purely data-driven manner. Yet, existing methods leveraging high-throughput molecular data often suffers from various limitations, e.g., noise, data heterogeneity, high dimensionality or poor interpretability...
March 24, 2017: Bioinformatics
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