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https://www.readbyqxmd.com/read/28339109/validation-of-dynamic-treatment-couch-tracking-for-prostate-sbrt
#1
Stefanie Ehrbar, Simon Schmid, Alexander Jöhl, Stephan Klöck, Matthias Guckenberger, Oliver Riesterer, Stephanie Tanadini-Lang
PURPOSE: In stereotactic body radiation therapy (SBRT) of prostatic cancer, a high dose per fraction is applied to the target with steep dose gradients. Intrafractional prostate motion can occur unpredictably during the treatment and lead to target miss. This work investigated the dosimetric benefit of motion compensation with dynamic treatment-couch tracking for prostate SBRT treatments in the presence of prostatic motion. METHODS: Ten SBRT treatment plans for prostate cancer patients with integrated boosts to their index lesion were prepared...
March 24, 2017: Medical Physics
https://www.readbyqxmd.com/read/28336082/-social-and-health-resources-in-catalonia-current-situation
#2
Ingrid Bullich-Marín, Pau Sánchez-Ferrín, Concepció Cabanes-Duran, Antoni Salvà-Casanovas
The network of social and health care has advanced since its inception. Furthermore, news services have been created and some resources have been adapted within the framework of respective health plans. This article presents the current situation of the different social and health resources in Catalonia, as well as the main changes that have occurred in recent years, more specifically in the period of the Health Plan 2011-2015. This period is characterised by an adaptation of the social and health network within the context of chronic care, for which the development of intermediate care resources has become the most relevant aspect...
March 20, 2017: Revista Española de Geriatría y Gerontología
https://www.readbyqxmd.com/read/28334927/consumer-segmentation-and-time-interval-between-types-of-hospital-admission-a-clinical-linkage-database-study
#3
Umesh T Kadam, Claire A Lawson, Dawn K Moody, Lucy Teece, John Uttley, John Harvey, Z Iqbal, P W Jones
Background: Healthcare policies target unplanned hospital admissions and 30-day re-admission as key measures of efficiency, but do not focus on factors that influence trajectories of different types of admissions in the same patient over time. Objectives: To investigate the influence of consumer segmentation and patient factors on the time intervals between different types of hospital admission. Research design, subjects and measures: A cohort design was applied to an anonymised linkage database for adults aged 40 years and over (N = 58 857)...
March 14, 2017: Journal of Public Health
https://www.readbyqxmd.com/read/28334802/engagement-strategies-that-foster-community-self-determination-in-participatory-research-insider-ownership-through-outsider-championship
#4
Jon Salsberg, Soultana Macridis, Enrique Garcia Bengoechea, Ann C Macaulay, Spencer Moore
Background.: In order to maximize the benefits of community-based participatory research, effective ownership over the research process must be at least equally in the hands of the community. A previous social network analysis documented that the participatory research process shifted ownership from academic to community partners, but did not show what actions and strategies fostered this shift. Objectives.: This study follows the trajectory of a community-academic partnership and asks, from the perspective of the project stakeholders, which actions and strategies over the lifespan of the research led to the observed shift in ownership and decision-making from the original external academics to the community stakeholders? Methods...
February 18, 2017: Family Practice
https://www.readbyqxmd.com/read/28332940/longitudinal-cancer-risk-management-trajectories-of-brca1-2-mutation-positive-reproductive-age-women
#5
Jennifer Louise Young, Allison Werner-Lin, Rebecca Mueller, Lindsey Hoskins, Norman Epstein, Mark H Greene
Young women with BRCA1/2 mutations face difficult health-care decisions regarding family formation, fertility, breastfeeding, and whether/when to undergo cancer risk-reducing surgery. This longitudinal qualitative study investigated these life choices during the reproductive years. We conducted two semistructured interviews over three years with 12 reproductive-age BRCA1/2-positive women. Researchers coded transcripts to examine the evolution of risk perceptions, risk management, and family planning decisions...
February 14, 2017: Journal of Psychosocial Oncology
https://www.readbyqxmd.com/read/28331887/android-application-for-determining-surgical-variables-in-brain-tumor-resection-procedures
#6
Rohan C Vijayan, Reid C Thompson, Lola B Chambless, Peter J Morone, Le He, Logan W Clements, Rebekah H Griesenauer, Hakmook Kang, Michael I Miga
The fidelity of image-guided neurosurgical procedures is often compromised due to the mechanical deformations that occur during surgery. In recent work, a framework was developed to predict the extent of this brain shift in brain-tumor resection procedures. The approach uses preoperatively determined surgical variables to predict brain shift and then subsequently corrects the patient's preoperative image volume to more closely match the intraoperative state of the patient's brain. However, a clinical workflow difficulty with the execution of this framework is the preoperative acquisition of surgical variables...
January 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28322886/high-gamma-oscillations-in-the-motor-cortex-during-visuo-motor-coordination-a-tacs-interferential-study
#7
E Santarnecchi, A Biasella, E Tatti, A Rossi, D Prattichizzo, S Rossi
BACKGROUND: While the role of beta (∼20Hz), theta (∼5Hz) and alpha (∼10Hz) oscillations in the motor areas have been repeatedly associated with defined properties of motor performance, the investigation of gamma (∼40-90Hz) oscillatory activity is a more recent and still not fully understood component of motor control physiology, despite its potential clinical relevance for motor disorders. OBJECTIVE/HYPOTHESIS: We have implemented an online neuromodulation paradigm based on transcranial alternating current stimulation (tACS) of the dominant motor cortex during a visuo-motor coordination task...
March 18, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/28321804/on-the-reproducibility-of-expert-operated-and-robotic-ultrasound-acquisitions
#8
Risto Kojcev, Ashkan Khakzar, Bernhard Fuerst, Oliver Zettinig, Carole Fahkry, Robert DeJong, Jeremy Richmon, Russell Taylor, Edoardo Sinibaldi, Nassir Navab
PURPOSE: We present the evaluation of the reproducibility of measurements performed using robotic ultrasound imaging in comparison with expert-operated sonography. Robotic imaging for interventional procedures may be a valuable contribution, but requires reproducibility for its acceptance in clinical routine. We study this by comparing repeated measurements based on robotic and expert-operated ultrasound imaging. METHODS: Robotic ultrasound acquisition is performed in three steps under user guidance: First, the patient is observed using a 3D camera on the robot end effector, and the user selects the region of interest...
March 20, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28303100/a-neural-dynamic-architecture-for-reaching-and-grasping-integrates-perception-and-movement-generation-and-enables-on-line-updating
#9
Guido Knips, Stephan K U Zibner, Hendrik Reimann, Gregor Schöner
Reaching for objects and grasping them is a fundamental skill for any autonomous robot that interacts with its environment. Although this skill seems trivial to adults, who effortlessly pick up even objects they have never seen before, it is hard for other animals, for human infants, and for most autonomous robots. Any time during movement preparation and execution, human reaching movement are updated if the visual scene changes (with a delay of about 100 ms). The capability for online updating highlights how tightly perception, movement planning, and movement generation are integrated in humans...
2017: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/28298027/anatomical-nuances-of-the-internal-carotid-artery-in-relation-to-the-quadrangular-space
#10
Ricardo L L Dolci, Leo F S Ditzel Filho, Carlos R Goulart, Smita Upadhyay, Lamia Buohliqah, Paulo R Lazarini, Daniel M Prevedello, Ricardo L Carrau
OBJECTIVE The aim of this study was to evaluate the anatomical variations of the internal carotid artery (ICA) in relation to the quadrangular space (QS) and to propose a classification system based on the results. METHODS A total of 44 human cadaveric specimens were dissected endonasally under direct endoscopic visualization. During the dissection, the anatomical variations of the ICA and their relationship with the QS were noted. RESULTS The space between the paraclival ICAs (i.e., intercarotid space) can be classified as 1 of 3 different shapes (i...
February 24, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28297452/an-epid-based-system-for-gantry-resolved-mlc-quality-assurance-for-vmat
#11
Benjamin J Zwan, Michael P Barnes, Todsaporn Fuangrod, Cameron J Stanton, Daryl J O'Connor, Paul J Keall, Peter B Greer
Multileaf collimator (MLC) positions should be precisely and independently measured as a function of gantry angle as part of a comprehensive quality assurance (QA) program for volumetric-modulated arc therapy (VMAT). It is also ideal that such a QA program has the ability to relate MLC positional accuracy to patient-specific dosimetry in order to determine the clinical significance of any detected MLC errors. In this work we propose a method to verify individual MLC trajectories during VMAT deliveries for use as a routine linear accelerator QA tool...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297273/the-dosimetric-impact-of-control-point-spacing-for-sliding-gap-mlc-fields
#12
Benjamin J Zwan, Jonathan Hindmarsh, Erin Seymour, Kankean Kandasamy, Kirbie Sloan, Rajesakar David, Christopher Lee
Dynamic sliding gap multileaf collimator (MLC) fields are used to model MLC properties within the treatment planning system (TPS) for dynamic treatments. One of the key MLC properties in the Eclipse TPS is the dosimetric leaf gap (DLG) and precise determination of this parameter is paramount to ensuring accurate dose delivery. In this investigation, we report on how the spacing between control points (CPs) for sliding gap fields impacts the dose delivery, MLC positioning accuracy, and measurement of the DLG...
November 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28296957/computer-assisted-electromagnetic-navigation-improves-accuracy-in-computed-tomography-guided-interventions-a-prospective-randomized-clinical-trial
#13
Pierre Durand, Alexandre Moreau-Gaudry, Anne-Sophie Silvent, Julien Frandon, Emilie Chipon, Maud Médici, Ivan Bricault
PURPOSE: To assess the accuracy and usability of an electromagnetic navigation system designed to assist Computed Tomography (CT) guided interventions. MATERIALS AND METHODS: 120 patients requiring a percutaneous CT intervention (drainage, biopsy, tumor ablation, infiltration, sympathicolysis) were included in this prospective randomized trial. Nineteen radiologists participated. Conventional procedures (CT group) were compared with procedures assisted by a navigation system prototype using an electromagnetic localizer to track the position and orientation of a needle holder (NAV group)...
2017: PloS One
https://www.readbyqxmd.com/read/28287073/validation-of-a-ct-guided-intervention-robot-for-biopsy-and-radiofrequency-ablation-experimental-study-with-an-abdominal-phantom
#14
Hyung Jin Won, Namkug Kim, Guk Bae Kim, Joon Beom Seo, Hongho Kim
PURPOSE: We aimed to evaluate the accuracy of a needle-placement robot for biopsy and radiofrequency ablation on an abdominal phantom. METHODS: A master-slave robotic system has been developed that includes a needle-path planning system and a needle-inserting robot arm with computed tomography (CT) and CT fluoroscopy guidance. For evaluation of its accuracy in needle placement, a commercially available abdominal phantom (Model 057A; CIRS Inc.) was used. The liver part of the phantom contains multiple spherical simulated tumors of three different size spheres...
March 13, 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/28285339/acoustic-window-planning-for-ultrasound-acquisition
#15
Rüdiger Göbl, Salvatore Virga, Julia Rackerseder, Benjamin Frisch, Nassir Navab, Christoph Hennersperger
Autonomous robotic ultrasound has recently gained considerable interest, especially for collaborative applications. Existing methods for acquisition trajectory planning are solely based on geometrical considerations, such as the pose of the transducer with respect to the patient surface. PURPOSE: This work aims at establishing acoustic window planning to enable autonomous ultrasound acquisitions of anatomies with restricted acoustic windows, such as the liver or the heart. METHODS: We propose a fully automatic approach for the planning of acquisition trajectories, which only requires information about the target region as well as existing tomographic imaging data, such as X-ray computed tomography...
March 11, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28284800/joint-prediction-of-longitudinal-development-of-cortical-surfaces-and-white-matter-fibers-from-neonatal-mri
#16
Islem Rekik, Gang Li, Pew-Thian Yap, Geng Chen, Weili Lin, Dinggang Shen
The human brain can be modeled as multiple interrelated shapes (or a multishape), each for characterizing one aspect of the brain, such as the cortex and white matter pathways. Predicting the developing multishape is a very challenging task due to the contrasting nature of the developmental trajectories of the constituent shapes: smooth for the cortical surface and non-smooth for white matter tracts due to changes such as bifurcation. We recently addressed this problem and proposed an approach for predicting the multishape developmental spatiotemporal trajectories of infant brains based only on neonatal MRI data using a set of geometric, dynamic, and fiber-to-surface connectivity features...
March 9, 2017: NeuroImage
https://www.readbyqxmd.com/read/28277204/towards-integrating-primary-care-with-cancer-care-a-regional-study-of-current-gaps-and-opportunities-in-canada
#17
Jonathan Sussman, Daryl Bainbridge, William K Evans
BACKGROUND AND OBJECTIVES: Better integration between cancer care systems and primary care physicians (PCPs) is a goal of most healthcare systems, but little direction exists on how this can be achieved. This study systematically examined the extent of integration between PCPs and a regional cancer program (RCP) to identify opportunities for improvement. METHOD: Cross-sectional survey of all practising PCPs in the region of interest using a study-specific instrument based on a three-tier conceptualization of integration...
February 2017: Healthcare Policy, Politiques de Santé
https://www.readbyqxmd.com/read/28275594/enabling-continuous-quality-improvement-in-practice-the-role-and-contribution-of-facilitation
#18
Gillian Harvey, Elizabeth Lynch
Facilitating the implementation of continuous quality improvement (CQI) is a complex undertaking. Numerous contextual factors at a local, organizational, and health system level can influence the trajectory and ultimate success of an improvement program. Some of these contextual factors are amenable to modification, others less so. As part of planning and implementing healthcare improvement, it is important to assess and build an understanding of contextual factors that might present barriers to or enablers of implementation...
2017: Frontiers in Public Health
https://www.readbyqxmd.com/read/28269428/the-impact-of-different-leaf-limited-accelerations-on-leaf-positional-error-of-a-self-developed-mlc-prototype
#19
Xiang Zhang, Peiqing Ye, Hui Zhang
Multi-leaf collimator (MLC) provides an available approach to achieve sophisticated radiotherapy techniques and plays an important role in advanced high quality radiation therapy. Delivery accuracy of radiation therapy mainly depends on the leaf sequence generated by treatment plans and dynamic performance of MLCs. Previous studies have explored the influence of various leaf limited velocities and dose rates on the leaf-positional error. However, there is a lack of research on the influence of different leaf limited accelerations on the delivery accuracy or leaf-positional error...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268849/a-stochastic-framework-for-spot-scanning-particle-therapy
#20
Marc Robini, Yuemin Zhu, Wanyu Liu, Isabelle Magnin
In spot-scanning particle therapy, inverse treatment planning is usually limited to finding the optimal beam fluences given the beam trajectories and energies. We address the much more challenging problem of jointly optimizing the beam fluences, trajectories and energies. For this purpose, we design a simulated annealing algorithm with an exploration mechanism that balances the conflicting demands of a small mixing time at high temperatures and a reasonable acceptance rate at low temperatures. Numerical experiments substantiate the relevance of our approach and open new horizons to spot-scanning particle therapy...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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