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trajectory planning

David T Fernandes Cabral, Georgios A Zenonos, Maximiliano Nuñez, Pinar Celtikci, Carl Snyderman, Eric Wang, Paul A Gardner, Juan C Fernandez-Miranda
BACKGROUND: The endoscopic endonasal approach (EEA) has been proposed as a potential alternative for ventral brainstem lesions. The surgical anatomy, feasibility, and limitations of the EEA for intrinsic brainstem lesions are still poorly understood. OBJECTIVE: To describe the surgical planning, anatomy, and technique of an intrinsic pontine glioma operated via EEA. METHODS: Six-human brainstems were prepared for white matter microdissection...
March 12, 2018: Operative Neurosurgery (Hagerstown, Md.)
Frank P Deane, Craig Gonsalvez, Caroline Joyce, Eileen Britt
OBJECTIVE: This research aimed to describe the developmental trajectories of clinical psychology trainees across competency domains over multiple placements. METHOD: Competency reviews of 252 trainees were completed at mid-placement and end-placement for up to four consecutive placements by 143 field supervisors. Competency was measured across multiple domains using the Clinical Psychology Practicum Competencies Rating Scale. RESULTS: There was an overall ascending stepped pattern occurring across all competency domains from early to late placements...
March 14, 2018: Journal of Clinical Psychology
J S Zhang, L Qu, Q Wang, Q P Gui, Y Z Hou, G C Sun, F Y Li, Z Z Zhang, X L Chen, J Zhang, Z H Sun, X G Yu, B N Xu
Objective: To investigate the clinical value of multimodal navigation-based virtual reality (MNVR) in the needle biopsy of intracranial eloquent lesions. Methods: From January 2016 to January 2017, 20 patients with intracranial deep-seated lesions involving eloquent brain areas underwent MNVR-aided needle biopsy at Department of Neurosurgery, People's Liberation Army General Hospital. Preoperatively, MNVR was used to propose and revise the biopsy planning. Intraoperatively, navigation helped trajectory avoid the eloquent structures...
March 1, 2018: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
Fatima Padilla-Cabal, Dietmar Georg, Hermann Fuchs
PURPOSE: The feasibility of Magnetic Resonance Image (MRI) based proton therapy is based, among several other factors, on the implementation of appropriate extensions on current dose calculation methods. This work aims to develop a pencil beam algorithm (PBA) for dose calculation of proton beams within magnetic field regions of up to 3T. METHODS: Monte Carlo (MC) simulations using the GATE 7.1/GEANT4.9.4p02 toolkit were performed to generate calibration and benchmarking data for the PBA...
March 12, 2018: Medical Physics
Vejay N Vakharia, Rachel Sparks, Kuo Li, Aidan G O'Keeffe, Anna Miserocchi, Andrew W McEvoy, Michael R Sperling, Ashwini Sharan, Sebastien Ourselin, John S Duncan, Chengyuan Wu
OBJECTIVE: Surgical resection of the mesial temporal structures brings seizure remission in 65% of individuals with drug-resistant mesial temporal lobe epilepsy (MTLE). Laser interstitial thermal therapy (LiTT) is a novel therapy that may provide a minimally invasive means of ablating the mesial temporal structures with similar outcomes, while minimizing damage to the neocortex. Systematic trajectory planning helps ensure safety and optimal seizure freedom through adequate ablation of the amygdalohippocampal complex (AHC)...
March 12, 2018: Epilepsia
Clemente Lauretti, Francesca Cordella, Anna Lisa Ciancio, Emilio Trigili, Jose Maria Catalan, Francisco Javier Badesa, Simona Crea, Silvio Marcello Pagliara, Silvia Sterzi, Nicola Vitiello, Nicolas Garcia Aracil, Loredana Zollo
The reference joint position of upper-limb exoskeletons is typically obtained by means of Cartesian motion planners and inverse kinematics algorithms with the inverse Jacobian; this approach allows exploiting the available Degrees of Freedom (i.e. DoFs) of the robot kinematic chain to achieve the desired end-effector pose; however, if used to operate non-redundant exoskeletons, it does not ensure that anthropomorphic criteria are satisfied in the whole human-robot workspace. This paper proposes a motion planning system, based on Learning by Demonstration, for upper-limb exoskeletons that allow successfully assisting patients during Activities of Daily Living (ADLs) in unstructured environment, while ensuring that anthropomorphic criteria are satisfied in the whole human-robot workspace...
2018: Frontiers in Neurorobotics
Qing Huang, Hui Ding, Xiaodong Wang, Guangzhi Wang
PURPOSE: Liver segmentation from CT images is a fundamental step in trajectory planning for computer-assisted interventional surgery. In this paper, we present a fully automatic procedure using modified graph cuts and feature detection for accurate and fast liver segmentation. METHODS: The initial slice and seeds of graph cuts are automatically determined using an intensity-based method with prior position information. A contrast term based on the similarities and differences of local organs across multi-slices is proposed to enhance the weak boundaries of soft organs and to prevent over-segmentation...
February 22, 2018: Computers in Biology and Medicine
Richard Williams, V Kemp
The development of the UK's military policy includes the potential for military organisations to deploy in support of humanitarian aid operations. This paper offers an overview of the risks to people's mental health of their exposure to emergencies, major incidents, disasters, terrorism, displacement, postconflict environments in which humanitarian aid is delivered, and deployments to conflict zones. It summarises the psychosocial approach recommended by many contemporary researchers and practitioners. It differentiates the extremely common experience of distress from the mental disorders that people who are affected may develop and introduces the construct of psychosocial resilience...
March 8, 2018: Journal of the Royal Army Medical Corps
Amy Peacock, Delyse Hutchinson, Judy Wilson, Clare McCormack, Raimondo Bruno, Craig A Olsson, Steve Allsop, Elizabeth Elliott, Lucinda Burns, Richard P Mattick
The aims of this study were to identify: (i) the proportion of women exceeding the caffeine intake guideline (>200 mg/day) during each trimester, accounting for point of pregnancy awareness; (ii) guideline adherence trajectories across pregnancy; (iii) maternal characteristics associated with trajectories; and (iv) association between adherence and growth restriction birth outcomes. Typical and maximal intake per consumption day for the first trimester (T1; pre- and post-pregnancy awareness), second (T2), and third trimester (T3) were recorded for a prospective cohort of pregnant Australian women with singleton births ( n = 1232)...
March 7, 2018: Nutrients
Manmohan Singh, K V Shabari Girishan, Jitin Bajaj, Kanwaljeet Garg
Parkinson's disease (PD) and dystonia are common indications for the deep brain stimulation (DBS) procedure. It is very important to be diligent about target localization and execution of the procedure. The single most important predictor of a good postoperative outcome is proper patient selection. The various steps of performing DBS include taking a preoperative non - stereotactic MRI, stereotactic frame fixation, fusion of MRI with stereotactic CT scan images, planning of the target and trajectory, lead placement at target through the planned trajectory, implantation of pulse generator/ battery and programming of the implanted device...
March 2018: Neurology India
Johannes Fauser, Georgios Sakas, Anirban Mukhopadhyay
PURPOSE: Interventions at the otobasis operate in the narrow region of the temporal bone where several highly sensitive organs define obstacles with minimal clearance for surgical instruments. Nonlinear trajectories for potential minimally invasive interventions can provide larger distances to risk structures and optimized orientations of surgical instruments, thus improving clinical outcomes when compared to existing linear approaches. In this paper, we present fast and accurate planning methods for such nonlinear access paths...
March 3, 2018: International Journal of Computer Assisted Radiology and Surgery
Lauren J Breen, Samar M Aoun, Moira O'Connor, Denise Howting, Georgia K B Halkett
CONTEXT: Many family caregivers are not prepared for the death of their family member or friend. Palliative care services tend to emphasise the patients' preparation for death rather than caregivers' preparation for, or living after, death. Caregivers' perspectives on anticipating and preparing for death are under-researched, despite preparation being associated with better bereavement outcomes. OBJECTIVES: The objective was to explore family caregivers' preparations for death...
February 27, 2018: Journal of Pain and Symptom Management
Paula Lozano, Amy Houtrow
Self-management improves health outcomes in chronic illness not only by improving adherence to the treatment plan but also by building the individual's capacity to navigate challenges and solve problems. Support for self-management is a critical need among children and adolescents with (medically and/or socially) complex chronic conditions. Self-management support refers to services that health systems and community agencies provide to persons with chronic illness and their families to facilitate self-management; it is a collaboration between the patient, family, and care providers...
March 2018: Pediatrics
Laura P Gelfman, Marie Bakitas, Lynne Warner Stevenson, James N Kirkpatrick, Nathan E Goldstein
BACKGROUND: Heart failure (HF) is a chronic progressive illness associated with physical and psychological burdens, high morbidity, mortality, and healthcare utilization. Palliative care is interdisciplinary care that aims to relieve suffering and improve quality of life for persons with serious illness and their families. It is offered simultaneously with disease-oriented care, unlike hospice or end-of-life care. Despite the demonstrated benefits of palliative care in other populations, evidence for palliative care in the HF population is limited...
June 2017: Journal of Palliative Medicine
Eva Hansen, Britta Grimme, Hendrik Reimann, Gregor Schöner
In a sequence of arm movements, any given segment could be influenced by its predecessors (carry-over coarticulation) and by its successor (anticipatory coarticulation). To study the interdependence of movement segments, we asked participants to move an object from an initial position to a first and then on to a second target location. The task involved ten joint angles controlling the three-dimensional spatial path of the object and hand. We applied the principle of the uncontrolled manifold (UCM) to analyze the difference between joint trajectories that either affect (non-motor equivalent) or do not affect (motor equivalent) the hand's trajectory in space...
February 28, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
Camille May Stengel, Famara Mane, Andrew Guise, Magath Pouye, Monika Sigrist, Tim Rhodes
BACKGROUND: Peer outreach harm reduction initiatives are being developed with and for people who use drugs in Dakar, Senegal. This is in response to growing injecting drug use across the West Africa region and linked emerging epidemics of HIV and hepatitis C. We undertook formative qualitative research to explore the feasibility and potential of peer outreach in this context and in particular how outreach could be linked to fostering community-level processes of change. METHODS: We undertook a total of 44 semi-structured qualitative interviews...
February 27, 2018: Harm Reduction Journal
Michael Hoerger, Joseph A Greer, Vicki A Jackson, Elyse R Park, William F Pirl, Areej El-Jawahri, Emily R Gallagher, Teresa Hagan, Juliet Jacobsen, Laura M Perry, Jennifer S Temel
Purpose We describe the key elements of early palliative care (PC) across the illness trajectory and examine whether visit content was associated with patient-reported outcomes and end-of-life care. Methods We performed a secondary analysis of patients with newly diagnosed advanced lung or noncolorectal GI cancer (N = 171) who were randomly assigned to receive early PC. Participants attended at least monthly visits with board-certified PC physicians and advanced practice nurses at Massachusetts General Hospital...
February 23, 2018: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
Alvin Y Chan, Lilit Mnatsakanyan, Mona Sazgar, Indranil Sen-Gupta, Jack J Lin, Frank P K Hsu, Sumeet Vadera
BACKGROUND: Responsive neurostimulation (RNS) is a relatively new treatment option that has been shown to be effective for patients with medically refractory focal epilepsy when resection is not possible, especially in bilateral mesial temporal onset. Robotic devices are becoming increasingly popular for use in stereotactic procedures such as stereoelectroencephalography, but have yet to be used when implanting RNS devices. OBJECTIVE: To show that these 2 forms of advanced technology were compatible and could be used effectively in patient care...
March 1, 2018: Operative Neurosurgery (Hagerstown, Md.)
Kaitlin M Flannery, Anna Vannucci, Christine McCauley Ohannessian
PURPOSE: Little is known about how and when coping trajectories differ between males and females. The current study aimed to examine gender differences in the use of specific coping strategies across developmental ages using time-varying effect modeling (TVEM) in a large, diverse community sample. METHODS: A longitudinal study following adolescents across 4 years of high school and 5 years post graduation (N = 1,251) was combined with a nationally representative cross-sectional study of 18- to 22-year-olds (N = 595) to examine changes in gender differences in the use of coping strategies between ages 13 and 25...
March 2018: Journal of Adolescent Health: Official Publication of the Society for Adolescent Medicine
Joseph Manzone, Matthew Heath
Reaching to a veridical target permits an egocentric spatial code (i.e., absolute limb and target position) to effect fast and effective online trajectory corrections supported via the visuomotor networks of the dorsal visual pathway. In contrast, a response entailing decoupled spatial relations between stimulus and response is thought to be primarily mediated via an allocentric code (i.e., the position of a target relative to another external cue) laid down by the visuoperceptual networks of the ventral visual pathway...
February 16, 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
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