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https://www.readbyqxmd.com/read/27906782/predicting-heart-dose-in-breast-cancer-patients-who-received-3d-conformal-radiation-therapy
#1
Daniel Wollschläger, Heiko Karle, Marcus Stockinger, Detlef Bartkowiak, Sandra Bührdel, Hiltrud Merzenich, Thomas Wiegel, Heinz Schmidberger, Maria Blettner
Cardiac late effects are a major health concern for long-term survivors after radiotherapy for breast cancer. Large cohort studies to better understand the exact dose-response relationship require individual estimates of radiation dose to the heart. To predict individual cardiac dose from information that is typically available for all members of a retrospective epidemiological cohort study, 774 female breast cancer patients treated with megavoltage tangential field radiotherapy in 1998-2008 were examined. All dose distributions were calculated using Eclipse with the anisotropic analytical algorithm (AAA) for photon fields and the electron Monte Carlo algorithm for electron boost fields...
January 2017: Health Physics
https://www.readbyqxmd.com/read/27894902/the-feasibility-of-forward-projected-model-based-iterative-reconstruction-solution-first-for-coronary-320-row-computed-tomography-angiography-a-pilot-study
#2
Eriko Maeda, Nobuo Tomizawa, Shigeaki Kanno, Koichiro Yasaka, Takatoshi Kubo, Kenji Ino, Rumiko Torigoe, Kuni Ohtomo
BACKGROUND: We aimed to assess and compare the influence of Forward projected model-based Iterative Reconstruction SoluTion (FIRST), a recently introduced full iterative reconstruction method, on radiation doses and image quality with that of Adaptive Iterative Dose Reduction (AIDR) 3D for 320-row cardiac computed tomography (CT). METHODS: A total of 184 patients subjected to single-beat reconstruction cardiac CT were retrospectively included. The first 89 patients received standard radiation doses; their data were reconstructed using AIDR 3D, whereas the last 95 patients received in average 20% reduction in tube current; their data were reconstructed using FIRST...
November 9, 2016: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/27893992/prediction-of-myocardial-infarction-by-assessing-regional-cardiac-wall-in-cmr-images-through-active-mesh-modeling
#3
Hossein Yousefi-Banaem, Saeed Kermani, Sasan Asiaei, Hamid Sanei
Myocardial infarction is a leading cause of morbidity and mortality. In this study, using Cine MRI images, the infarct region was precisely determined by examining the local migration path length of critical points on myocardium borders and the fractional thickening effects. First, MRI Cine images of Epi/Endocardium were processed in 3D for all slices, and then incorporated in all frames to build a dynamic model. Epi/Endocardium images were segmented using Heiberg algorithm, and then by a robust restricted block matching algorithm, the sparse points were tracked...
November 14, 2016: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/27892655/3d-printed-polycaprolactone-carbon-nanotube-composite-scaffolds-for-cardiac-tissue-engineering
#4
Chee Meng Benjamin Ho, Abhinay Mishra, Pearlyn Teo Pei Lin, Sum Huan Ng, Wai Yee Yeong, Young-Jin Kim, Yong-Jin Yoon
Fabrication of tissue engineering scaffolds with the use of novel 3D printing has gained lot of attention, however systematic investigation of biomaterials for 3D printing have not been widely explored. In this report, well-defined structures of polycaprolactone (PCL) and PCL- carbon nanotube (PCL-CNT) composite scaffolds have been designed and fabricated using a 3D printer. Conditions for 3D printing has been optimized while the effects of varying CNT percentages with PCL matrix on the thermal, mechanical and biological properties of the printed scaffolds are studied...
November 28, 2016: Macromolecular Bioscience
https://www.readbyqxmd.com/read/27890729/maturation-of-human-embryonic-stem-cell-derived-cardiomyocytes-hesc-cms-in-3d-collagen-matrix-effects-of-niche-cell-supplementation-and-mechanical-stimulation
#5
W Zhang, C W Kong, M H Tong, W H Chooi, N Huang, R A Li, B P Chan
: Cardiomyocytes derived from human embryonic stem cells (hESC-CMs) are regarded as a promising source for regenerative medicine, drug testing and disease modeling. Nevertheless, cardiomyocytes are immature in terms of their contractile structure, metabolism and electrophysiological properties. Here, we fabricate cardiac muscle strips by encapsulating hESC-CMs in collagen-based biomaterials. Supplementation of niche cells at 3% to the number of hESC-CMs enhance the maturation of the hESC-CMs in 3D tissue matrix...
November 24, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27889952/effects-of-different-doses-of-2-3-dimercaptosuccinic-acid-modified-fe2-o3-nanoparticles-on-intercalated-discs-in-engineered-cardiac-tissues
#6
Yongchao Mou, Shuanghong Lv, Fei Xiong, Yao Han, Yuwei Zhao, Junjie Li, Ning Gu, Jin Zhou
Although iron oxide nanoparticles (IRONs) were applied in clinical magnetic resonance imaging in vivo and magnetic tissue engineering in vitro widely, the underlying effects of IRONs on the development of cardiomyocytes especially the intercellular junctions, intercalated discs (IDs), remain an unknown issue. Given the critical role of three-dimensional (3D) engineered cardiac tissues (ECTs) in evaluation of nanoparticles toxicology, it remained necessary to understand the effects of IRONs on IDs assembly of cardiomyocytes in 3D environment...
November 27, 2016: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/27885752/biventricular-paced-qrs-area-predicts-acute-hemodynamic-crt-response-better-than-qrs-duration-or-qrs-amplitudes
#7
Jan DE Pooter, Milad El Haddad, Marc DE Buyzere, Hernandez Alfonso Aranda, Richard Cornelussen, Berthold Stegemann, Christopher A Rinaldi, Maciej Sterlinski, Adam Sokal, Darrel P Francis, Luc Jordaens, Roland X Stroobandt, Frederic VAN Heuverswyn, Frank Timmermans
INTRODUCTION: Vectorcardiographic (VCG) QRS area of left bundle branch block (LBBB) predicts acute hemodynamic response in cardiac resynchronization therapy (CRT) patients. We hypothesized that changes in QRS area occurring with biventricular pacing (BV) might predict acute hemodynamic CRT response (AHR). METHODS AND RESULTS: VCGs of 624 BV paced electrocardiograms (25 LBBB patients with 35 different pacing configurations) were calculated according to Frank's orthogonal lead system...
November 25, 2016: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/27884358/application-of-3-dimensional-computed-tomographic-image-guidance-to-watchman-implantation-and-impact-on%C3%A2-early-operator-learning-curve-single-center-experience
#8
Dee Dee Wang, Marvin Eng, Daniel Kupsky, Eric Myers, Michael Forbes, Mehnaz Rahman, Mohammad Zaidan, Sachin Parikh, Janet Wyman, Milan Pantelic, Thomas Song, Jeff Nadig, Patrick Karabon, Adam Greenbaum, William O'Neill
OBJECTIVES: The aim of this study was to examine the impact of 3-dimensional (3D) computed tomographic (CT) guided procedural planning for left atrial appendage (LAA) occlusion on the early operator WATCHMAN learning curve. BACKGROUND: Traditional WATCHMAN implantation is dependent on 2-dimensional transesophageal echocardiographic (TEE) sizing and intraprocedural guidance. METHODS: LAA occlusion with the WATCHMAN device was performed in 53 patients...
November 28, 2016: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/27881295/measuring-dose-from-radiotherapy-treatments-in-the-vicinity-of-a-cardiac-pacemaker
#9
Samuel C Peet, Rachael Wilks, Tanya Kairn, Scott B Crowe
This study investigated the dose absorbed by tissues surrounding artificial cardiac pacemakers during external beam radiotherapy procedures. The usefulness of out-of-field reference data, treatment planning systems, and skin dose measurements to estimate the dose in the vicinity of a pacemaker was also examined. Measurements were performed by installing a pacemaker onto an anthropomorphic phantom, and using radiochromic film and optically stimulated luminescence dosimeters to measure the dose in the vicinity of the device during the delivery of square fields and clinical treatment plans...
November 21, 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27880739/estimation-of-cardiac-motion-in-cine-mri-sequences-by-correlation-transform-optical-flow-of-monogenic-features-distance
#10
Bin Gao, Wanyu Liu, Liang Wang, Zhengjun Liu, Pierre Croisille, Philippe Delachartre, Patrick Clarysse
Cine-MRI is widely used for the analysis of cardiac function in clinical routine, because of its high soft tissue contrast and relatively short acquisition time in comparison with other cardiac MRI techniques. The gray level distribution in cardiac cine-MRI is relatively homogenous within the myocardium, and can therefore make motion quantification difficult. To ensure that the motion estimation problem is well posed, more image features have to be considered. This work is inspired by a method previously developed for color image processing...
December 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27879127/numerical-simulations-of-a-3d-fluid-structure-interaction-model-for-blood-flow-in-an-atherosclerotic-artery
#11
Oualid Kafi, Nader El Khatib, Jorge Tiago, Adelia Sequeira
The inflammatory process of atherosclerosis leads to the formation of an atheromatous plaque in the intima of the blood vessel. The plaque rupture may result from the interaction between the blood and the plaque. In each cardiac cycle, blood interacts with the vessel, considered as a compliant nonlinear hyperelastic. A three dimensional idealized fluid-structure interaction (FSI) model is constructed to perform the blood-plaque and blood-vessel wall interaction studies. An absorbing boundary condition (BC) is imposed directly on the outflow in order to cope with the spurious reflexions due to the truncation of the computational domain...
February 1, 2017: Mathematical Biosciences and Engineering: MBE
https://www.readbyqxmd.com/read/27875591/reentry-and-ectopic-pacemakers-emerge-in-a-three-dimensional-model-for-a-slab-of-cardiac-tissue-with-diffuse-microfibrosis-near-the-percolation-threshold
#12
Sergio Alonso, Rodrigo Weber Dos Santos, Markus Bär
Arrhythmias in cardiac tissue are generally associated with irregular electrical wave propagation in the heart. Cardiac tissue is formed by a discrete cell network, which is often heterogeneous. Recently, it was shown in simulations of two-dimensional (2D) discrete models of cardiac tissue that a wave crossing a fibrotic, heterogeneous region may produce reentry and transient or persistent ectopic activity provided the fraction of conducting connections is just above the percolation threshold. Here, we investigate the occurrence of these phenomena in three-dimensions by simulations of a discrete model representing a thin slab of cardiac tissue...
2016: PloS One
https://www.readbyqxmd.com/read/27875190/combined-visualization-of-vessel-deformation-and-hemodynamics-in-cerebral-aneurysms
#13
Monique Meuschke, Samuel Voss, Oliver Beuing, Bernhard Preim, Kai Lawonn
We present the first visualization tool that combines patient-specific hemodynamics with information about the vessel wall deformation and wall thickness in cerebral aneurysms. Such aneurysms bear the risk of rupture, whereas their treatment also carries considerable risks for the patient. For the patient-specific rupture risk evaluation and treatment analysis, both morphological and hemodynamic data have to be investigated. Medical researchers emphasize the importance of analyzing correlations between wall properties such as the wall deformation and thickness, and hemodynamic attributes like the Wall Shear Stress and near-wall flow...
January 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/27875074/right-ventricular-dysfunction-after-cardiac-surgery-diagnostic-options
#14
Lars Grønlykke, Hanne Berg Ravn, Finn Gustafsson, Christian Hassager, Jesper Kjaergaard, Jens C Nilsson
Right ventricular (RV) failure after cardiac surgery is associated with an ominous prognosis. The aetiology of RV failure is multifaceted and the ability to recognize RV failure early is paramount in order to initiate timely treatment. The present review focuses on different diagnostic modalities for RV function and discusses the normal versus abnormal findings in RV monitoring after cardiac surgery and the limitations of the applicable diagnostic modalities. There are specific challenges in RV assessment after cardiac surgery due to a loss of longitudinal contraction and a concomitant gain of transverse contraction...
November 22, 2016: Scandinavian Cardiovascular Journal: SCJ
https://www.readbyqxmd.com/read/27872849/automated-segmentation-of-coronary-arteries-based-on-statistical-region-growing-and-heuristic-decision-method
#15
Yun Tian, Yutong Pan, Fuqing Duan, Shifeng Zhao, Qingjun Wang, Wei Wang
The segmentation of coronary arteries is a vital process that helps cardiovascular radiologists detect and quantify stenosis. In this paper, we propose a fully automated coronary artery segmentation from cardiac data volume. The method is built on a statistics region growing together with a heuristic decision. First, the heart region is extracted using a multi-atlas-based approach. Second, the vessel structures are enhanced via a 3D multiscale line filter. Next, seed points are detected automatically through a threshold preprocessing and a subsequent morphological operation...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27869673/3d-visualization-of-developmental-toxicity-of-2-4-6-trinitrotoluene-in-zebrafish-embryogenesis-using-light-sheet-microscopy
#16
Juneyong Eum, Jina Kwak, Hee Joung Kim, Seoyoung Ki, Kooyeon Lee, Ahmed A Raslan, Ok Kyu Park, Md Ashraf Uddin Chowdhury, Song Her, Yun Kee, Seung-Hae Kwon, Byung Joon Hwang
Environmental contamination by trinitrotoluene is of global concern due to its widespread use in military ordnance and commercial explosives. Despite known long-term persistence in groundwater and soil, the toxicological profile of trinitrotoluene and other explosive wastes have not been systematically measured using in vivo biological assays. Zebrafish embryos are ideal model vertebrates for high-throughput toxicity screening and live in vivo imaging due to their small size and transparency during embryogenesis...
November 17, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27869081/long-term-update-of-nrg-oncology-rtog-0319-a-phase-1-and-2%C3%A2-trial-to-evaluate-3-dimensional-conformal-radiation-therapy-confined-to-the-region-of%C3%A2-the%C3%A2-lumpectomy-cavity-for-stage-i-and-ii-breast%C3%A2-carcinoma
#17
Rachel Rabinovitch, Jennifer Moughan, Frank Vicini, Helen Pass, John Wong, Susan Chafe, Ivy Petersen, Douglas W Arthur, Julia White
PURPOSE: NRG Oncology RTOG 0319 was the first cooperative group trial in the United States to evaluate 3-dimensional conformal radiation therapy (3D-CRT) accelerated partial breast irradiation (APBI). This report updates secondary endpoints of toxicity and efficacy. METHODS AND MATERIALS: Patients with stage I or II invasive breast cancer (tumor size ≤3 cm, ≤3 positive lymph nodes, negative margins) were eligible for 3D-CRT APBI: 38.5 Gy in 10 twice-daily fractions...
December 1, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27869052/altering-management-decisions-with-gained-anatomical-insight-from-a-3d-printed-model-of-a-complex-ventricular-septal-defect
#18
Puneet Bhatla, Ralph S Mosca, Justin T Tretter
Rapid prototyping is quickly gaining utility in various complex forms of CHD. In properly selected cases, these printed models provide detailed anatomical understanding that help guide potential surgical and cardiac catheterisation interventions. We present a case of a tunnel-like ventricular septal defect referred for surgical repair, where the decision to obtain a three-dimensional printed model helped in better understanding of the anatomy, leading to delaying, and hopefully avoiding altogether, surgical repair...
November 21, 2016: Cardiology in the Young
https://www.readbyqxmd.com/read/27866678/patient-specific-cfd-models-for-intraventricular-flow-analysis-from-3d-ultrasound-imaging-comparison-of-three-clinical-cases
#19
A M Bavo, A M Pouch, J Degroote, J Vierendeels, J H Gorman, R C Gorman, P Segers
BACKGROUND: As the intracardiac flow field is affected by changes in shape and motility of the heart, intraventricular flow features can provide diagnostic indications. Ventricular flow patterns differ depending on the cardiac condition and the exploration of different clinical cases can provide insights into how flow fields alter in different pathologies. METHODS: In this study, we applied a patient-specific computational fluid dynamics model of the left ventricle and mitral valve, with prescribed moving boundaries based on transesophageal ultrasound images for three cardiac pathologies, to verify the abnormal flow patterns in impaired hearts...
November 11, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27866675/hemodynamics-of-patient-specific-aorta-pulmonary-shunt-configurations
#20
Senol Piskin, H Firat Altin, Okan Yildiz, Ihsan Bakir, Kerem Pekkan
Optimal hemodynamics in aorta-pulmonary shunt reconstruction is essential for improved post-operative recovery of the newborn congenital heart disease patient. However, prior to in vivo execution, the prediction of post-operative hemodynamics is extremely challenging due to the interplay of multiple confounding physiological factors. It is hypothesized that the post-operative performance of the surgical shunt can be predicted through computational blood flow simulations that consider patient size, shunt configuration, cardiac output and the complex three-dimensional disease anatomy...
November 11, 2016: Journal of Biomechanics
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