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https://www.readbyqxmd.com/read/28080121/hand-matters-left-hand-gestures-enhance-metaphor-explanation
#1
Paraskevi Argyriou, Christine Mohr, Sotaro Kita
Research suggests that speech-accompanying gestures influence cognitive processes, but it is not clear whether the gestural benefit is specific to the gesturing hand. Two experiments tested the "(right/left) hand-specificity" hypothesis for self-oriented functions of gestures: gestures with a particular hand enhance cognitive processes involving the hemisphere contralateral to the gesturing hand. Specifically, we tested whether left-hand gestures enhance metaphor explanation, which involves right-hemispheric processing...
January 12, 2017: Journal of Experimental Psychology. Learning, Memory, and Cognition
https://www.readbyqxmd.com/read/28079260/an-experimentally-validated-couch-and-mlc-tracking-simulator-used-to-investigate-hybrid-couch-mlc-tracking
#2
Jakob Toftegaard, Rune Hansen, Thomas Ravkilde, Kristijan Macek, Per Rugaard Poulsen
PURPOSE/OBJECTIVE: Couch and MLC tracking are two novel techniques to mitigate intrafractional tumor motion on a conventional linear accelerator, but both techniques still have residual dosimetric errors. Here, we first propose and experimentally validate a software tool to simulate couch and MLC tracking, and then use the simulator to study hybrid couch-MLC tracking for improved tracking performance. MATERIALS AND METHODS: The tracking simulator requires a treatment plan and a motion trajectory as input and simulates the delivered monitor units and motion of all accelerator parts as function of time...
January 12, 2017: Medical Physics
https://www.readbyqxmd.com/read/28078105/asymmetric-facial-bone-fragmentation-mirrors-asymmetric-distribution-of-cranial-neuromasts-in-blind-mexican-cavefish
#3
Joshua B Gross, Andrew Gangidine, Amanda K Powers
Craniofacial asymmetry is a convergent trait widely distributed across animals that colonize the extreme cave environment. Although craniofacial asymmetry can be discerned easily, other complex phenotypes (such as sensory organ position and numerical variation) are challenging to score and compare. Certain bones of the craniofacial complex demonstrate substantial asymmetry, and co-localize to regions harboring dramatically expanded numbers of mechanosensory neuromasts. To determine if a relationship exists between this expansion and bone fragmentation in cavefish, we developed a quantitative measure of positional symmetry across the left-right axis...
November 2016: Symmetry
https://www.readbyqxmd.com/read/28075342/trunk-motion-system-tms-using-printed-body-worn-sensor-bws-via-data-fusion-approach
#4
Mohammad Iman Mokhlespour Esfahani, Omid Zobeiri, Behzad Moshiri, Roya Narimani, Mohammad Mehravar, Ehsan Rashedi, Mohamad Parnianpour
Human movement analysis is an important part of biomechanics and rehabilitation, for which many measurement systems are introduced. Among these, wearable devices have substantial biomedical applications, primarily since they can be implemented both in indoor and outdoor applications. In this study, a Trunk Motion System (TMS) using printed Body-Worn Sensors (BWS) is designed and developed. TMS can measure three-dimensional (3D) trunk motions, is lightweight, and is a portable and non-invasive system. After the recognition of sensor locations, twelve BWSs were printed on stretchable clothing with the purpose of measuring the 3D trunk movements...
January 8, 2017: Sensors
https://www.readbyqxmd.com/read/28075183/systematic-evaluation-of-lung-tumor-motion-using-four-dimensional-computed-tomography
#5
Sebastian Sarudis, Anna Karlsson Hauer, Jan Nyman, Anna Bäck
BACKGROUND: Respiratory-induced lung tumor motion may decrease robustness and outcome of radiation therapy (RT) if not accounted for. This study provides detailed information on the motion distribution of lung tumors for a group of 126 patients treated with stereotactic body RT. MATERIAL AND METHODS: Four-dimensional computed tomography scans were reviewed to assess lung tumor motion. The tumor motion was determined by the center of mass shift based on a rigid registration of the breathing phases containing the largest positional differences in the inferior-superior (IS), left-right (LR), and anterior-posterior (AP) directions...
January 11, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28074492/confirmation-of-resting-state-bold-fluctuations-in-the-human-brainstem-and-spinal-cord-after-identification-and-removal-of-physiological-noise
#6
Shreyas Harita, Patrick W Stroman
PURPOSE: Resting-state functional MRI (rs-fMRI) has been used to investigate networks within the cortex, but its use in the brainstem (BS) and spinal cord (SC) has been limited. This region presents challenges for fMRI, partly because of sources of physiological noise. This study aims to quantify noise contributions to rs-fMRI, and to obtain evidence of resting-state blood oxygenation level-dependent (BOLD) fluctuations. METHODS: Resting-state-fMRI data were obtained from the BS/SC in 16 participants, at 3 Tesla, with T2 -weighted single-shot fast spin-echo imaging...
January 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28073377/magnitude-and-influencing-factors-of-respiration-induced-liver-motion-during-abdominal-compression-in-patients-with-intrahepatic-tumors
#7
Yong Hu, Yong-Kang Zhou, Yi-Xing Chen, Zhao-Chong Zeng
PURPOSE: The purpose of this study was to use 4-dimensional-computed tomography (4D-CT) to evaluate respiration-induced liver motion magnitude and influencing factors in patients with intrahepatic tumors undergoing abdominal compression. METHODS: From January 2012 to April 2016, 99 patients with intrahepatic tumors were included in this study. They all underwent 4D-CT to assess respiratory liver motion. This was performed during abdominal compression in 53 patients and during free-breathing (no abdominal compression) in 46 patients...
January 10, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28073044/influence-of-the-body-schema-on-mirror-touch-synesthesia
#8
Jared Medina, Carrie DePasquale
Individuals with mirror-touch synesthesia (MTS) report feeling touch on their own body when seeing someone else being touched. We examined how the body schema - an on-line representation of body position in space - is involved in mapping touch from a viewed body to one's own body. We showed 45 mirror-touch synesthetes videos of a hand being touched, varying the location of the viewed touch by hand (left, right), skin surface (palmar, dorsal) and finger (index, ring). Participant hand posture was either congruent or incongruent with the posture of the viewed hand...
December 24, 2016: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28072584/verification-of-respiratory-gated-radiotherapy-with-new-real-time-tumour-tracking-radiotherapy-system-using-cine-epid-images-and-a-log-file
#9
Takehiro Shiinoki, Hideki Hanazawa, Yuki Yuasa, Koya Fujimoto, Takuya Uehara, Keiko Shibuya
<u>Purposes:</u> A combined system comprising the TrueBeam linear accelerator and a new real-time tumour-tracking radiotherapy system, SyncTraX, was installed at our institution. The objectives of this study are to develop a method for the verification of respiratory-gated radiotherapy with SyncTraX using cine electronic portal image device (EPID) images and a log file and to verify this treatment in clinical cases. <u>Methods and Materials:</u> Respiratory-gated radiotherapy was performed using TrueBeam and the SyncTraX system...
January 10, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28070886/spinal-cord-atrophy-in-anterior-posterior-direction-reflects-impairment-in-multiple-sclerosis
#10
H Lundell, O Svolgaard, A-M Dogonowski, J Romme Christensen, F Selleberg, P Soelberg Sørensen, M Blinkenberg, H R Siebner, E Garde
OBJECTIVE: To investigate how atrophy is distributed over the cross section of the upper cervical spinal cord and how this relates to functional impairment in multiple sclerosis (MS). METHODS: We analysed the structural brain MRI scans of 54 patients with relapsing-remitting MS (n=22), primary progressive MS (n=9), secondary progressive MS (n=23) and 23 age- and sex-matched healthy controls. We measured the cross-sectional area (CSA), left-right width (LRW) and anterior-posterior width (APW) of the spinal cord at the segmental level C2...
January 10, 2017: Acta Neurologica Scandinavica
https://www.readbyqxmd.com/read/28070685/porcine-spine-finite-element-model-a-complementary-tool-to-experimental-scoliosis-fusionless-instrumentation
#11
Bahe Hachem, Carl-Eric Aubin, Stefan Parent
PURPOSE: Developing fusionless devices to treat pediatric scoliosis necessitates lengthy and expensive animal trials. The objective was to develop and validate a porcine spine numerical model as an alternative platform to assess fusionless devices. METHODS: A parametric finite element model (FEM) of an osseoligamentous porcine spine and rib cage, including the epiphyseal growth plates, was developed. A follower-type load replicated physiological and gravitational loads...
January 9, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28065605/early-commissural-diencephalic-neurons-control-habenular-axon-extension-and-targeting
#12
Carlo A Beretta, Nicolas Dross, Luca Guglielmi, Peter Bankhead, Marina Soulika, Jose A Gutierrez-Triana, Alessio Paolini, Lucia Poggi, Julien Falk, Soojin Ryu, Marika Kapsimali, Ulrike Engel, Matthias Carl
Most neuronal populations form on both the left and right sides of the brain. Their efferent axons appear to grow synchronously along similar pathways on each side, although the neurons or their environment often differ between the two hemispheres [1-4]. How this coordination is controlled has received little attention. Frequently, neurons establish interhemispheric connections, which can function to integrate information between brain hemispheres (e.g., [5]). Such commissures form very early, suggesting their potential developmental role in coordinating ipsilateral axon navigation during embryonic development [4]...
December 29, 2016: Current Biology: CB
https://www.readbyqxmd.com/read/28059293/asymmetric-diffraction-from-two-component-optical-gratings-made-of-passive-and-lossy-materials
#13
Guanquan Liang, Ayman Abouraddy, Demetrios Christodoulides, Edwin L Thomas
Diffraction with asymmetric enhancement and suppression, and alternating contrast for symmetric diffraction orders is demonstrated from planar two-component optical gratings made of passive/lossy materials. Simulations agree well with the experimental diffraction pattern of the fabricated sample. Our fabrication approach uses simple, standard planar micro/nano lithography employing one photoresist and one dye. No 3D profiling is needed. The phenomena is due to the left-right asymmetric material distribution in the periodic grating, which gives rise to non-reciprocal light coupling for diffraction to the positive and negative orders...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28048467/su-g-jep2-08-image-guided-radiation-therapy-using-synthetic-cts-in-brain-cancer
#14
R G Price, J Kim, W Zheng, I J Chetty, C Glide-Hurst
PURPOSE: Synthetic-CTs(synCTs) are essential for MR-only treatment planning. However, the performance of synCT for IGRT must be carefully assessed. This work evaluated the accuracy of synCT and synCT-generated DRRs and determined their performance for IGRT in brain cancer radiation therapy. METHODS: MR-SIM and CT-SIM images were acquired of a novel anthropomorphic phantom and a cohort of 12 patients. SynCTs were generated by combining an ultra-short echo time (UTE) sequence with other MRI datasets using voxel-based weighted summation...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048292/su-g-jep4-06-evaluation-of-interfractional-and-intrafractional-tumor-motion-in-stereotactic-liver-radiotherapy-based-on-four-dimensional-cone-beam-computed-tomography-using-fiducial-markers
#15
Y Shimohigashi, F Araki, R Toya, M Maruyama, Y Nakaguchi
PURPOSE: The purpose of this study was to evaluate the interfractional and intrafractional motion of liver tumors in stereotactic body radiation therapy (SBRT), based on four-dimensional cone-beam computed tomography using fiducial markers. (4D-CBCT). METHODS: Seven patients with liver tumors were treated by SBRT with abdominal compression (AC) in five fractions with image guidance based on 4D-CBCT. The 4D-CBCT studies were performed to determine the individualized internal margin for the planning simulation...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048042/tu-ab-bra-07-distortion-free-3d-diffusion-mri-on-an-mri-guided-radiotherapy-system-for-longitudinal-tumor-response-assessment
#16
Y Gao, Y Yang, N Rangwala, M Cao, D Low, P Hu
PURPOSE: To develop a reliable, 3D distortion-free diffusion MRI technique for longitudinal tumor response assessment and MRI-guided adaptive radiotherapy(RT). METHODS: A diffusion prepared 3D turbo spin echo readout (DP-TSE) sequence was developed and compared with the conventional diffusion-weighted single-shot echo-planar-imaging (DW-ssEPI) sequence in a commercially available diffusion phantom, and one head-and-neck and one brain cancer patient on an MRI-guided RT system (ViewRay)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048008/su-f-t-289-mlc-fluence-sonogram-based-delivery-quality-assurance-for-bilateral-breast-irradiation
#17
Rajesh Thiyagarajan, K P Karrthick, Tejinder Kataria, N Arunai, Nambi Raj, Ramu Mahendran, Tamil Selvan, Palani Duraikannu
PURPOSE: Performing DQA for Bilateral (B-L) breast tomotherapy is a challenging task due to the limitation of any commercially available detector array or film. Aim of this study is to perform DQA for B-L breast tomotherapy plan using MLC fluence sinogram. METHODS: Treatment plan was generated on Tomotherapy system for B-L breast tumour. B-L breast targets were given 50.4 Gy prescribed over 28 fractions. Plan is generated with 6 MV photon beam & pitch was set to 0...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047643/su-f-t-679-monte-carlo-simulation-on-surface-dose-in-preclinical-irradiation-using-monoenergetic-photon-beams
#18
A Vuong, J Chow
PURPOSE: This study investigated the surface dose variation in preclinical irradiation using small animal, when monoenergetic photon beams with energy range from 50 keV to 1.25 MeV were used. METHODS: Inhomogeneous, homogeneous and bone-tissue homogeneous mouse phantom based on the same CT image set were used. The homogeneous and bone-tissue homogeneous phantom were created with the relative electron density of all and only bone voxels of the mouse overridden to one, respectively...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047178/th-ab-202-12-the-first-clinical-implementation-of-a-real-time-six-degree-of-freedom-tracking-system-during-radiation-therapy
#19
D Nguyen, J Kim, R O'Brien, C Huang, J Booth, P Greer, K Legge, P Poulsen, J Martin, P Keall
PURPOSE: In current practice, imaging is typically performed prior to treatment; the cancer target motion during treatment is unknown. We present the first clinical implementation of real time Kilovoltage Intrafraction Monitoring (KIM) system which tracks the cancer target translational and rotational motions during treatment. METHODS: KIM technology: KIM estimates the 3D position of the target tumour based on segmented 2D positions of the three implanted fiducials in each of the kV images (125 kV, 10 mA at 11 fps) taken continuously during the treatment arc...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047131/su-g-iep2-14-validation-of-plastimatch-mabs-a-tool-for-automatic-image-segmentation
#20
P Zaffino, P Raudaschl, K Fritscher, M Spadea, G Sharp
PURPOSE: In this work we present the validation of Plastimatch MABS, an open source software for multi atlas based segmentation of medical images. METHODS: The validation was performed on two different clinical datasets: 1) 25 CT image volumes of patients treated for H&N cancer; 2) 20 MRI series of patients having a neurological diagnosis. For the first set, 8 organs at risk to be spared during the therapy were segmented: mandible, brainstem and both left/right optic nerves, parotid and submandibular glands...
June 2016: Medical Physics
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