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https://www.readbyqxmd.com/read/28078945/influences-of-population-size-and-density-on-birthplace-effects
#1
David J Hancock, Patrícia Coutinho, Jean Côté, Isabel Mesquita
Contextual influences on talent development (e.g., birthplace effects) have become a topic of interest for sport scientists. Birthplace effects occur when being born in a certain city size leads to participation or performance advantages, typically for those born in smaller or mid-sized cities. The purpose of this study was to investigate birthplace effects in Portuguese volleyball players by analysing city size, as well as population density - an important but infrequently used variable. Participants included 4062 volleyball players (Mage = 33), 53...
January 12, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28051335/managing-the-training-load-in-adolescent-athletes
#2
Andrew Murray
While historically adolescents were removed from their parents to prepare to become warriors, this process repeats itself in modern times but with the outcome being athletic performance. This review considers the process of developing athletes and managing load against the backdrop of differing approaches of conserving and maximizing the talent available. It acknowledges the typical training 'dose' that adolescent athletes receive across a number of sports and the typical 'response' when it is excessive or not managed appropriately...
January 4, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28048570/we-ab-204-05-d-i-in-nih-funding-research
#3
D Chew
: Many efforts have been made to increase diversity in the science workforce. In order for us to be competitive in innovation and ingenuity we need to reach out to any source of intellectual talent. Having greater diversity can only increase the creativity in medical physics. In order for students to succeed academically they need role models and mentors with whom they can identify. Literature has shown that racial and ethnic diversity has both direct and indirect positive effects on the educational outcomes, career advancement and motivation of students...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048494/we-ab-204-01-welcome
#4
B Curran
: Many efforts have been made to increase diversity in the science workforce. In order for us to be competitive in innovation and ingenuity we need to reach out to any source of intellectual talent. Having greater diversity can only increase the creativity in medical physics. In order for students to succeed academically they need role models and mentors with whom they can identify. Literature has shown that racial and ethnic diversity has both direct and indirect positive effects on the educational outcomes, career advancement and motivation of students...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048422/we-ab-204-08-pathway-to-developing-d-i-program-at-aapm
#5
E Higginbotham
: Many efforts have been made to increase diversity in the science workforce. In order for us to be competitive in innovation and ingenuity we need to reach out to any source of intellectual talent. Having greater diversity can only increase the creativity in medical physics. In order for students to succeed academically they need role models and mentors with whom they can identify. Literature has shown that racial and ethnic diversity has both direct and indirect positive effects on the educational outcomes, career advancement and motivation of students...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048383/th-ef-bra-01-5d-respiratory-motion-model-based-iterative-reconstruction-method-for-4dcbct
#6
J Liu, D Low, H Gao
PURPOSE: The 4DCBCT image reconstruction suffers from the insufficient number of projections and the error from projection binning. We have recently developed a 5D respiratory motion model based iterative reconstruction method (5D method) for 4DCBCT in a proof-of-concept 2D setting. The 5D method reconstructs a reference image and two time-independent vector fields without projection binning, based on which any temporal phase at each projection can be generated. As a result, the 5D method needs fewer number of projections and is free from binning error...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047910/we-ab-204-06-d-i-in-global-health
#7
T Ngoma
: Many efforts have been made to increase diversity in the science workforce. In order for us to be competitive in innovation and ingenuity we need to reach out to any source of intellectual talent. Having greater diversity can only increase the creativity in medical physics. In order for students to succeed academically they need role models and mentors with whom they can identify. Literature has shown that racial and ethnic diversity has both direct and indirect positive effects on the educational outcomes, career advancement and motivation of students...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047840/we-ab-204-02-definition-of-d-i-aapm-efforts-stephen-avery-will-ngwa
#8
S Avery
: Many efforts have been made to increase diversity in the science workforce. In order for us to be competitive in innovation and ingenuity we need to reach out to any source of intellectual talent. Having greater diversity can only increase the creativity in medical physics. In order for students to succeed academically they need role models and mentors with whom they can identify. Literature has shown that racial and ethnic diversity has both direct and indirect positive effects on the educational outcomes, career advancement and motivation of students...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047834/su-c-bra-04-automated-segmentation-of-head-and-neck-ct-images-for-radiotherapy-treatment-planning-via-multi-atlas-machine-learning-maml
#9
X Ren, G Sharp, H Gao
PURPOSE: Accurate image segmentation is a crucial step during image guided radiation therapy. This work proposes multi-atlas machine learning (MAML) algorithm for automated segmentation of head-and-neck CT images. METHODS: As the first step, the algorithm utilizes normalized mutual information as similarity metric, affine registration combined with multiresolution B-Spline registration, and then fuses together using the label fusion strategy via Plastimatch. As the second step, the following feature selection strategy is proposed to extract five feature components from reference or atlas images: intensity (I), distance map (D), box (B), center of gravity (C) and stable point (S)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047410/tu-ab-brc-01-spherical-harmonic-based-finite-element-method-shfem-a-new-angular-discretization-of-linear-boltzmann-transport-equation-for-accurate-dose-calculation
#10
X Hong, G Chen, H Gao
PURPOSE: As a deterministic method for dose calculation, the linear Boltzmann transport equation (LBTE) can reach the same accuracy as the Monte Carlo method (MC). In terms of speed, LBTE can be significantly accelerated through various state-of-art numerical techniques. The angular discretization is crucial since the accuracy of LBTE highly depends on it and the computational time of LBTE is quadratic with respect to number of discretized angles. This work proposes a new angular discretization scheme that synergizes spherical harmonics method and finite element method...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047245/we-ab-204-07-d-i-in-global-health
#11
R Alfonso-Laguardia
: Many efforts have been made to increase diversity in the science workforce. In order for us to be competitive in innovation and ingenuity we need to reach out to any source of intellectual talent. Having greater diversity can only increase the creativity in medical physics. In order for students to succeed academically they need role models and mentors with whom they can identify. Literature has shown that racial and ethnic diversity has both direct and indirect positive effects on the educational outcomes, career advancement and motivation of students...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047212/su-c-206-06-shift-invariant-projection-and-backprojection-for-helical-ct-based-on-a-self-consistent-coordinate
#12
M Guo, H Gao
PURPOSE: Despite its promising utility, iterative CT image reconstruction is often time-consuming, especially for helical CT, for which the X-ray projections and backprojections are computationally dominant. To overcome the insufficient memory storage for projection and backprojection matrices, they are usually computed on-the-fly with parallel implementation via GPU. In this work, we develop an efficient method to compute projections and backprojections without repeated on-the-fly computations for helical CT...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047180/we-ab-204-03-increasing-access-to-medical-physics-education-and-research-excellence-ampere
#13
W Ngwa
: Many efforts have been made to increase diversity in the science workforce. In order for us to be competitive in innovation and ingenuity we need to reach out to any source of intellectual talent. Having greater diversity can only increase the creativity in medical physics. In order for students to succeed academically they need role models and mentors with whom they can identify. Literature has shown that racial and ethnic diversity has both direct and indirect positive effects on the educational outcomes, career advancement and motivation of students...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047138/su-f-e-12-elective-international-rotations-in-medical-physics-residency-programs
#14
D Brown, A Mundt, J Einck, T Pawlicki
PURPOSE: The purpose of this educational program is to motivate talented, intelligent individuals to become stakeholders in the global effort to improve access to radiotherapy. METHODS: The need to improve global access to radiotherapy has been clearly established and several organizations are making substantial progress in securing funding and developing plans to achieve this worthwhile goal. The incorporation of elective international rotations in residency programs may provide one possible mechanism to promote and support this future investment...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046801/mo-de-207a-07-filtered-iterative-reconstruction-fir-via-proximal-forward-backward-splitting-a-synergy-of-analytical-and-iterative-reconstruction-method-for-ct
#15
H Gao
PURPOSE: This work is to develop a general framework, namely filtered iterative reconstruction (FIR) method, to incorporate analytical reconstruction (AR) method into iterative reconstruction (IR) method, for enhanced CT image quality. METHODS: FIR is formulated as a combination of filtered data fidelity and sparsity regularization, and then solved by proximal forward-backward splitting (PFBS) algorithm. As a result, the image reconstruction decouples data fidelity and image regularization with a two-step iterative scheme, during which an AR-projection step updates the filtered data fidelity term, while a denoising solver updates the sparsity regularization term...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046541/su-c-brc-02-accelerating-linear-boltzmann-transport-equation-by-an-asymptotic-preserving-scheme
#16
G Chen, H Chen, X Hong, M Tang, H Gao
PURPOSE: Linear Boltzmann transport equation (LBTE) is as accurate as the Monte Carlo method for dose calculation. This work is to develop an asymptotic-preserving (AP) scheme to accelerate the LBTE, i.e., to achieve the same accuracy with significantly reduced number of spatial grids. METHODS: In this proof-of-concept study, two-dimensional LBTE is solved by the discrete ordinate method. The Level-Symmetric (LQn) quadrature set is employed for angular discretization of LBTE...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046512/we-ab-204-04-d-i-in-physics
#17
P Hammer
: Many efforts have been made to increase diversity in the science workforce. In order for us to be competitive in innovation and ingenuity we need to reach out to any source of intellectual talent. Having greater diversity can only increase the creativity in medical physics. In order for students to succeed academically they need role models and mentors with whom they can identify. Literature has shown that racial and ethnic diversity has both direct and indirect positive effects on the educational outcomes, career advancement and motivation of students...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046428/we-ab-204-00-diversity-and-inclusion-in-medical-physics
#18
Stephen Avery
: Many efforts have been made to increase diversity in the science workforce. In order for us to be competitive in innovation and ingenuity we need to reach out to any source of intellectual talent. Having greater diversity can only increase the creativity in medical physics. In order for students to succeed academically they need role models and mentors with whom they can identify. Literature has shown that racial and ethnic diversity has both direct and indirect positive effects on the educational outcomes, career advancement and motivation of students...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046364/su-f-p-22-will-the-low-residency-placement-rate-scare-talented-candidates-away-from-our-profession
#19
B Loughery, K Hendrickson, J Burmeister
PURPOSE: The low placement rate (∼25%) of medical physics residency match applicants is well-known to medical physics graduate students, and is beginning to be appreciated by prospective students. We examine this placement rate in detail and its potential impact on future recruitment into our profession based on survey data of both match applicants and program directors. METHODS: To evaluate and validate residency placement rates, we analyzed annual CAMPEP graduate and residency program reports and data from individual graduate program websites...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046354/we-fg-207b-02-material-reconstruction-for-spectral-computed-tomography-with-detector-response-function
#20
J Liu, H Gao
PURPOSE: Different from the conventional computed tomography (CT), spectral CT based on energy-resolved photon-counting detectors is able to provide the unprecedented material composition. However, an important missing piece for accurate spectral CT is to incorporate the detector response function (DRF), which is distorted by factors such as pulse pileup and charge-sharing. In this work, we propose material reconstruction methods for spectral CT with DRF. METHODS: The polyenergetic X-ray forward model takes the DRF into account for accurate material reconstruction...
June 2016: Medical Physics
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