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https://www.readbyqxmd.com/read/29679500/a-unified-material-decomposition-framework-for-quantitative-dual-and-triple-energy-ct-imaging
#1
Wei Zhao, Don Vernekohl, Fei Han, Bin Han, Hao Peng, Yong Yang, Lei Xing, James K Min
PURPOSE: Many clinical applications depend critically on the accurate differentiation and classi-fication of different types of materials in patient anatomy. This work introduces a unified framework for accurate nonlinear material decomposition and applies it, for the first time, in the concept of triple-energy CT (TECT) for enhanced material differentiation and classification as well as dual-energy CT METHODS: We express polychromatic projection into a linear combination of line integrals of material-selective images...
April 21, 2018: Medical Physics
https://www.readbyqxmd.com/read/29678478/immunohistochemical-cd271-expression-correlates-with-melanoma-progress-in-a-case-control-study
#2
Patricia Switten Nielsen, Rikke Riber-Hansen, Torben Steiniche
Putative cancer stem cell (CSC) markers have arisen from melanoma mouse and in vitro models, but their expression in paraffin embedded patient samples relative to clinical outcome remains largely unexplored. Rather than cells of the tumour bulk, conceivably, CSC drive tumour progression. Accordingly, complete eradication may prevent melanoma relapse. Because elevated tumour-cell proliferation is an established indicator of aggressive disease, this study aimed to investigate the correlation between melanoma recurrence and proliferation of putative CSC that express CD271, CD166, or CD20...
April 17, 2018: Pathology
https://www.readbyqxmd.com/read/29678098/improving-patient-experience-in-a-children-s-hospital-new-digital-services-for-children-and-their-families
#3
Nina Karisalmi, Johanna Kaipio, Pekka Lahdenne
Digital services are increasingly being developed for the healthcare sector. In Finland, the five university hospitals in 2016 launched a virtual hospital platform, Healthvillage.fi that includes several portals. The aim of this study is to explore the needs of children and their families related to digital services in the context of a children's hospital in Finland. Two methods were used to examine the needs and expectations of children and their families: a web-based survey for parents and video diaries for children...
2018: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/29677951/modelling-feedback-in-virtual-patients-an-iterative-approach
#4
Natalia Stathakarou, Andrzej A Kononowicz, Lars Henningsohn, Cormac McGrath
Virtual Patients (VPs) offer learners the opportunity to practice clinical reasoning skills and have recently been integrated in Massive Open Online Courses (MOOCs). Feedback is a central part of a branched VP, allowing the learner to reflect on the consequences of their decisions and actions. However, there is insufficient guidance on how to design feedback models within VPs and especially in the context of their application in MOOCs. In this paper, we share our experiences from building a feedback model for a bladder cancer VP in a Urology MOOC, following an iterative process in three steps...
2018: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/29677217/optimisation-of-three-dimensional-lower-jaw-resection-margin-planning-using-a-novel-black-bone-magnetic-resonance-imaging-protocol
#5
Astrid M Hoving, Joep Kraeima, Rutger H Schepers, Hildebrand Dijkstra, Jan Hendrik Potze, Bart Dorgelo, Max J H Witjes
BACKGROUND: MRI is the optimal method for sensitive detection of tumour tissue and pre-operative staging in oral cancer. When jawbone resections are necessary, the current standard of care for oral tumour surgery in our hospital is 3D virtual planning from CT data. 3D printed jawbone cutting guides are designed from the CT data. The tumour margins are difficult to visualise on CT, whereas they are clearly visible on MRI scans. The aim of this study was to change the conventional CT-based workflow by developing a method for 3D MRI-based lower jaw models...
2018: PloS One
https://www.readbyqxmd.com/read/29677192/the-dyad-adaptive-paced-auditory-serial-addition-test-da-pasat-normative-data-and-the-effects-of-repeated-testing-simulated-malingering-and-traumatic-brain-injury
#6
David L Woods, John M Wyma, Timothy J Herron, E William Yund, Bruce Reed
The Paced Auditory Serial Addition Test (PASAT) is widely used to evaluate processing speed and executive function in patients with multiple sclerosis, traumatic brain injury, and other neurological disorders. In the PASAT, subjects listen to sequences of digits while continuously reporting the sum of the last two digits presented. Four different stimulus onset asynchronies (SOAs) are usually tested, with difficulty increasing as SOAs are reduced. Ceiling effects are common at long SOAs, while the digit delivery rate often exceeds the subject's processing capacity at short SOAs, causing some subjects to stop performing altogether...
2018: PloS One
https://www.readbyqxmd.com/read/29677037/small-left-ventricular-size-is-an-independent-risk-factor-for-ventricular-assist-device-thrombosis
#7
Venkat Keshav Chivukula, Jennifer A Beckman, Anthony R Prisco, Shin Lin, Todd F Dardas, Richard K Cheng, Stephen D Farris, Jason W Smith, Nahush A Mokadam, Claudius Mahr, Alberto Aliseda
The prevalence of ventricular assist device (VAD) therapy has continued to increase due to a stagnant donor supply and growing advanced heart failure (HF) population. We hypothesize that left ventricular (LV) size strongly influences biocompatibility and risk of thrombosis. Unsteady computational fluid dynamics (CFD) was used in conjunction with patient-derived computational modeling and virtual surgery with a standard, apically implanted inflow cannula. A dual-focus approach of evaluating thrombogenicity was employed: platelet-based metrics to characterize the platelet environment and flow-based metrics to investigate hemodynamics...
April 18, 2018: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29677020/clinical-experience-in-minimally-invasive-cardiac-surgery-with-virtually-wall-less-venous-cannulas
#8
Enrico Ferrari, Ludwig K von Segesser, Denis Berdajs, Ludwig Müller, Maximilian Halbe, Francesco Maisano
OBJECTIVE: Inadequate peripheral venous drainage during minimally invasive cardiac surgery (MICS) is a challenge and cannot always be solved with increased vacuum or increased centrifugal pump speed. The present study was designed to assess the benefit of virtually wall-less transfemoral venous cannulas during MICS. METHODS: Transfemoral venous cannulation with virtually wall-less cannulas (3/8″ 24F 530-630-mm ST) was performed in 10 consecutive patients (59 ± 10 years, 8 males, 2 females) undergoing MICS for mitral (6), aortic (3), and other (4) procedures (combinations possible)...
April 19, 2018: Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery
https://www.readbyqxmd.com/read/29676964/advanced-imaging-techniques-in-evaluation-of-colorectal-cancer
#9
Roberto García-Figueiras, Sandra Baleato-González, Anwar R Padhani, Antonio Luna-Alcalá, Ana Marhuenda, Joan C Vilanova, Iria Osorio-Vázquez, Anxo Martínez-de-Alegría, Antonio Gómez-Caamaño
Imaging techniques are clinical decision-making tools in the evaluation of patients with colorectal cancer (CRC). The aim of this article is to discuss the potential of recent advances in imaging for diagnosis, prognosis, therapy planning, and assessment of response to treatment of CRC. Recent developments and new clinical applications of conventional imaging techniques such as virtual colonoscopy, dual-energy spectral computed tomography, elastography, advanced computing techniques (including volumetric rendering techniques and machine learning), magnetic resonance (MR) imaging-based magnetization transfer, and new liver imaging techniques, which may offer additional clinical information in patients with CRC, are summarized...
April 20, 2018: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/29675359/three-dimensional-speckle-tracking-echocardiography-detects-different-patterns-of-right-atrial-dysfunction-in-selected-disorders-a-short-summary-from-the-magyar-path-study
#10
Attila Nemes, Péter Domsik, Anita Kalapos, Árpád Kormányos, Nóra Ambrus, Tamás Forster
The right atrium (RA) is the most under-evaluated heart chamber in the clinical practice. Three-dimensional (3D) speckle-tracking echocardiography (STE) merges the benefits of 3D echocardiography and STE: volumetric and strain assessment of the RA can be performed at the same time from the same digitally acquired 3D echocardiographic dataset with a special equipment using a virtual 3D model of the RA. A diagnostic focused study is under way at the Second Department of Medicine and Cardiology Center, University of Szeged, Hungary to assess 3D-STE-derived RA variables in different patient populations, which serves as a substudy of Motion Analysis of the heart and Great vessels bY three-dimensionAl speckle-tRacking echocardiography in Pathological cases (MAGYAR-Path) Study...
March 2018: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/29675142/reviewing-clinical-effectiveness-of-active-training-strategies-of-platform-based-ankle-rehabilitation-robots
#11
REVIEW
Xiangfeng Zeng, Guoli Zhu, Mingming Zhang, Sheng Q Xie
Objective: This review aims to provide a systematical investigation of clinical effectiveness of active training strategies applied in platform-based ankle robots. Method: English-language studies published from Jan 1980 to Aug 2017 were searched from four databases using key words of "Ankle∗ " AND "Robot∗ " AND "Effect∗ OR Improv∗ OR Increas∗ ." Following an initial screening, three rounds of discrimination were successively conducted based on the title, the abstract, and the full paper...
2018: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29673507/pre-angioplasty-instantaneous-wave-free-ratio-pullback-predicts-hemodynamic-outcome-in-humans-with-coronary-artery-disease-primary-results-of-the-international-multicenter-ifr-gradient-registry
#12
Yuetsu Kikuta, Christopher M Cook, Andrew S P Sharp, Pablo Salinas, Yoshiaki Kawase, Yasutsugu Shiono, Alessandra Giavarini, Masafumi Nakayama, Salvatore De Rosa, Sayan Sen, Sukhjinder S Nijjer, Rasha Al-Lamee, Ricardo Petraco, Iqbal S Malik, Ghada W Mikhail, Raffi R Kaprielian, Gilbert W M Wijntjens, Shinsuke Mori, Arata Hagikura, Martin Mates, Atsushi Mizuno, Farrel Hellig, Kelvin Lee, Luc Janssens, Kazunori Horie, Shah Mohdnazri, Raul Herrera, Florian Krackhardt, Masahiro Yamawaki, John Davies, Hideo Takebayashi, Thomas Keeble, Seiichi Haruta, Flavio Ribichini, Ciro Indolfi, Jamil Mayet, Darrel P Francis, Jan J Piek, Carlo Di Mario, Javier Escaned, Hitoshi Matsuo, Justin E Davies
OBJECTIVES: The authors sought to evaluate the accuracy of instantaneous wave-Free Ratio (iFR) pullback measurements to predict post-percutaneous coronary intervention (PCI) physiological outcomes, and to quantify how often iFR pullback alters PCI strategy in real-world clinical settings. BACKGROUND: In tandem and diffuse disease, offline analysis of continuous iFR pullback measurement has previously been demonstrated to accurately predict the physiological outcome of revascularization...
April 23, 2018: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/29673199/thoracic-lumbar-and-sacral-pedicle-screw-placement-using-stryker-ziehm-virtual-screw-technology-and-navigated-stryker-cordless-driver-3-technical-note
#13
Praveen Satarasinghe, Kojo D Hamilton, Michael J Tarver, Robert J Buchanan, Michael T Koltz
OBJECT: Utilization of pedicle screws (PS) for spine stabilization is common in spinal surgery. With reliance on visual inspection of anatomical landmarks prior to screw placement, the free-hand technique requires a high level of surgeon skill and precision. Three-dimensional (3D), computer-assisted virtual neuronavigation improves the precision of PS placement and minimization steps. METHODS: Twenty-three patients with degenerative, traumatic, or neoplastic pathologies received treatment via a novel three-step PS technique that utilizes a navigated power driver in combination with virtual screw technology...
April 17, 2018: Journal of Clinical Medicine
https://www.readbyqxmd.com/read/29672530/development-of-an-effective-virtual-environment-in-eliciting-craving-in-adolescents-and-young-adults-with-internet-gaming-disorder
#14
Yu-Bin Shin, Jae-Jin Kim, Min-Kyeong Kim, Sunghyon Kyeong, Young Hoon Jung, Hyojung Eom, Eunjoo Kim
Internet gaming disorder (IGD) is a new disorder that warrants further investigation, as recently noted in the research criteria of the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition. Offering controlled environments that increase cue-induced craving, virtual reality cue-exposure therapy has been shown to be effective for some addiction disorders. To assess the feasibility of virtual reality for patients with IGD, this study aimed to develop virtual environments that represent risk situations for inducing craving, and assess the effect of virtual reality in cue reactivity...
2018: PloS One
https://www.readbyqxmd.com/read/29671410/motion-induced-interplay-effects-for-vmat-radiotherapy
#15
Anneli Edvardsson, Fredrik Nordström, Crister Ceberg, Sofie Ceberg
The purpose of this study was to develop a method to simulate breathing motion induced interplay effects for volumetric modulated arc therapy (VMAT), to verify the proposed method with measurements, and to use the method to investigate how interplay effects vary with different patient- and machine specific parameters. VMAT treatment plans were created on a virtual phantom in a treatment planning system (TPS). Interplay effects were simulated by dividing each plan into smaller sub-arcs using an in-house developed software and shifting the isocenter for each sub-arc to simulate a sin6 breathing motion in the superior-inferior direction...
April 19, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29671146/validation-trial-for-efficacy-of-ultrasonographic-measurement-method-to-predict-ascitic-volume-using-virtual-ultrasonography
#16
Masashi Hirooka, Yohei Koizumi, Yusuke Imai, Atsushi Yukimoto, Takao Watanabe, Osamu Yoshida, Masanori Abe, Yoichi Hiasa
PURPOSE: The aim of this study was to clarify whether ultrasound quantitative methods were positively correlated with volume of ascites evaluated by whole abdominopelvic CT. METHODS: Sixty-eight patients with cirrhotic ascites were retrospectively analyzed. First, to confirm that virtual ultrasonography (VUS) is an alternative method to conventional ultrasound, 22 patients underwent both conventional ultrasonography and VUS. Second, the efficacy of US quantitative methods (3-point method, 4-point method, 5-point method, and Matsumoto's method) was confirmed by VUS in 68 patients...
April 18, 2018: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/29670888/computational-fluid-dynamic-analysis-of-the-left-atrial-appendage-to-predict-thrombosis-risk
#17
Giorgia Maria Bosi, Andrew Cook, Rajan Rai, Leon J Menezes, Silvia Schievano, Ryo Torii, Gaetano Burriesci
During Atrial Fibrillation (AF) more than 90% of the left atrial thrombi responsible for thromboembolic events originate in the left atrial appendage (LAA), a complex small sac protruding from the left atrium (LA). Current available treatments to prevent thromboembolic events are oral anticoagulation, surgical LAA exclusion, or percutaneous LAA occlusion. However, the mechanism behind thrombus formation in the LAA is poorly understood. The aim of this work is to analyse the hemodynamic behaviour in four typical LAA morphologies - "Chicken wing", "Cactus", "Windsock" and "Cauliflower" - to identify potential relationships between the different shapes and the risk of thrombotic events...
2018: Frontiers in Cardiovascular Medicine
https://www.readbyqxmd.com/read/29670632/quantitative-simulations-predict-treatment-strategies-against-fungal-infections-in-virtual-neutropenic-patients
#18
Sandra Timme, Teresa Lehnert, Maria T E Prauße, Kerstin Hünniger, Ines Leonhardt, Oliver Kurzai, Marc Thilo Figge
The condition of neutropenia, i.e., a reduced absolute neutrophil count in blood, constitutes a major risk factor for severe infections in the affected patients. Candida albicans and Candida glabrata are opportunistic pathogens and the most prevalent fungal species in the human microbiota. In immunocompromised patients, they can become pathogenic and cause infections with high mortality rates. In this study, we use a previously established approach that combines experiments and computational models to investigate the innate immune response during blood stream infections with the two fungal pathogens C...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29669002/tractography-verified-by-intraoperative-magnetic-resonance-imaging-and-subcortical-stimulation-during-tumor-resection-near-the-corticospinal-tract
#19
Timo Münnich, Jan Klein, Elke Hattingen, Anika Noack, Eva Herrmann, Volker Seifert, Christian Senft, Marie-Therese Forster
BACKGROUND: Tractography is a popular tool for visualizing the corticospinal tract (CST). However, results may be influenced by numerous variables, eg, the selection of seeding regions of interests (ROIs) or the chosen tracking algorithm. OBJECTIVE: To compare different variable sets by correlating tractography results with intraoperative subcortical stimulation of the CST, correcting intraoperative brain shift by the use of intraoperative MRI. METHODS: Seeding ROIs were created by means of motor cortex segmentation, functional MRI (fMRI), and navigated transcranial magnetic stimulation (nTMS)...
April 14, 2018: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29667471/cost-effectiveness-analysis-of-suvorexant-for-the-treatment-of-japanese-elderly-patients-with-chronic-insnomnia-in-a-virtual-cohort
#20
Shinichi Nishimura, Mutsuhiro Nakao
AIMS: We assessed the cost effectiveness of the orexin receptor antagonist suvorexant against zolpidem, the most widely used hypnotic benzodiazepine receptor agonist in Japan. To this end, a model was used that factored in insomnia and the risk for hip fractures, which have devastating effects on the elderly. METHODS: Data were derived from published papers. The target population was a virtual cohort of elderly patients (≥65 years) with insomnia residing in Japan...
April 18, 2018: Journal of Medical Economics
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