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https://www.readbyqxmd.com/read/28218455/experimental-evaluation-of-magnified-haptic-feedback-for-robot-assisted-needle-insertion-and-palpation
#1
Leonardo Meli, Claudio Pacchierotti, Domenico Prattichizzo
BACKGROUND: Haptic feedback has been proven to play a key role in enhancing the performance of teleoperated medical procedures. However, due to safety issues, commercially-available medical robots do not currently provide the clinician with haptic feedback. METHODS: This work presents the experimental evaluation of a teleoperation system for robot-assisted medical procedures able to provide magnified haptic feedback to the clinician. Forces registered at the operating table are magnified and provided to the clinician through a 7-DoF haptic interface...
February 20, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28210341/a-multidisciplinary-investigation-of-the-effects-of-competitive-state-anxiety-on-serve-kinematics-in-table-tennis
#2
Vuong Ngo, Hugh Richards, Miran Kondric
Displays of anxiety in table tennis were assessed through subjective (a self-report questionnaire), physiological (heart-rate variability) and kinematic variables. Using a within-group crossover design, 9 university-level table tennis players completed a series of serves under low- and high-anxiety conditions. Anxiety manipulation was achieved through the introduction of a national standard table tennis player, known to the participants, to receive serves in the high-anxiety condition, whilst serves were received by no opponent in the low-anxiety condition...
January 1, 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28210337/extraction-of-knowledge-from-the-topographic-attentive-mapping-network-and-its-application-in-skill-analysis-of-table-tennis
#3
Isao Hayashi, Masanori Fujii, Toshiyuki Maeda, Jasmin Leveille, Tokio Tasaka
The Topographic Attentive Mapping (TAM) network is a biologically-inspired classifier that bears similarities to the human visual system. In case of wrong classification during training, an attentional top-down signal modulates synaptic weights in intermediate layers to reduce the difference between the desired output and the classifier's output. When used in a TAM network, the proposed pruning algorithm improves classification accuracy and allows extracting knowledge as represented by the network structure...
January 1, 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28210336/effect-of-changing-table-tennis-ball-material-from-celluloid-to-plastic-on-the-post-collision-ball-trajectory
#4
Yuki Inaba, Sho Tamaki, Haruhiko Ikebukuro, Koshi Yamada, Hiroki Ozaki, Kazuto Yoshida
The official material used in table tennis balls was changed from celluloid to plastic, a material free of celluloid, in 2014. The purpose of this study was to understand the differences and similarities in the two types of ball materials by comparing their behavior upon collision with a table. The behavior of the balls before and after collision with a table, at various initial speeds ranging from 15 to 115 km/h, was captured using high-speed cameras. Velocities and spin rates before collision and velocities after collision were computed to calculate the coefficients of restitution and friction...
January 1, 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28203602/hamstring-contracture-after-acl-reconstruction-is-associated-with-an-increased-risk-of-cyclops-syndrome
#5
Francisco Guerra Pinto, Mathieu Thaunat, Matt Daggett, Charles Kajetanek, Tiago Marques, Tales Guimares, Bénédicte Quelard, Bertrand Sonnery-Cottet
BACKGROUND: Cyclops syndrome is characterized by loss of terminal knee extension due to proliferative fibrous nodule formation in the intercondylar notch. This complication occurs in the early postoperative period after anterior cruciate ligament reconstruction (ACLR). The pathogenesis of Cyclops syndrome is not well understood. HYPOTHESIS: Persistent hamstring contracture after ACLR is associated with an increased risk of subsequent Cyclops syndrome. STUDY DESIGN: Case-control study; Level of evidence, 3...
January 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28197849/effect-of-myofascial-techniques-for-treatment-of-upper-limb-dysfunctions-in-breast-cancer-survivors-randomized-controlled-trial
#6
An De Groef, Marijke Van Kampen, Nele Verlvoesem, Evi Dieltjens, Lore Vos, Tessa De Vrieze, Marie-Rose Christiaens, Patrick Neven, Inge Geraerts, Nele Devoogdt
PURPOSE: Besides pain, myofascial dysfunctions may contribute to the presence of upper limb impairments such as impaired range of motion, decreased strength, lymphedema, and altered postures and kinematics. Therefore, the aim of this study was to investigate the effect of myofascial therapy in addition to a standard physical therapy program for treatment of upper limb dysfunctions in breast cancer survivors. METHODS: Fifty women treated for a unilateral breast cancer with pain and myofascial dysfunctions at the upper limb region...
February 14, 2017: Supportive Care in Cancer: Official Journal of the Multinational Association of Supportive Care in Cancer
https://www.readbyqxmd.com/read/28157790/physical-design-factors-contributing-to-patient-falls
#7
Debajyoti Pati, Shabboo Valipoor, Aimee Cloutier, James Yang, Patricia Freier, Thomas E Harvey, Jaehoon Lee
OBJECTIVES: The aim of this study was to identify physical design elements that contribute to potential falls in patient rooms. METHODS: An exploratory, physical simulation-based approach was adopted for the study. Twenty-seven subjects, older than 70 years (11 male and 16 female subjects), conducted scripted tasks in a mockup of a patient bathroom and clinician zone. Activities were captured using motion-capture technology and video recording. After biomechanical data processing, video clips associated with potential fall moments were extracted and then examined and coded by a group of registered nurses and health care designers...
February 3, 2017: Journal of Patient Safety
https://www.readbyqxmd.com/read/28107235/an-experimental-biomechanical-study-on-artificial-atlantoodontoid-joint-replacement-in-dogs
#8
Quanjin Zang, Yanming Liu, Dengfeng Wang, Haopeng Li, Pinglin Yang, Dong Wang, Xijing He
STUDY DESIGN: This study tested the biomechanics of artificial atlantoodontoid joint replacement (AAOJR) in a dog model. Dogs were divided into the artificial AAOJR group (n=10), the decompression group (n=10), and the healthy control group (n=10) using a random number table. OBJECTIVE: To evaluate whether the use of AAOJR for repair of atlantoaxial instability retains rotation and restores stability. SUMMARY OF BACKGROUND DATA: Atlantoaxial instability is characterized by excessive movement or laxity at the junction between the atlas (C1) and axis (C2)...
February 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28097277/combining-the-spin-separated-exact-two-component-relativistic-hamiltonian-with-the-equation-of-motion-coupled-cluster-method-for-the-treatment-of-spin-orbit-splittings-of-light-and-heavy-elements
#9
Zhanli Cao, Zhendong Li, Fan Wang, Wenjian Liu
The spin-separated exact two-component (X2C) relativistic Hamiltonian [sf-X2C+so-DKHn, J. Chem. Phys., 2012, 137, 154114] is combined with the equation-of-motion coupled-cluster method with singles and doubles (EOM-CCSD) for the treatment of spin-orbit splittings of open-shell molecular systems. Scalar relativistic effects are treated to infinite order from the outset via the spin-free part of the X2C Hamiltonian (sf-X2C), whereas the spin-orbit couplings (SOC) are handled at the CC level via the first-order Douglas-Kroll-Hess (DKH) type of spin-orbit operator (so-DKH1)...
February 1, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28095857/real-time-inverse-kinematics-for-the-upper-limb-a-model-based-algorithm-using-segment-orientations
#10
Bence J Borbély, Péter Szolgay
BACKGROUND: Model based analysis of human upper limb movements has key importance in understanding the motor control processes of our nervous system. Various simulation software packages have been developed over the years to perform model based analysis. These packages provide computationally intensive-and therefore off-line-solutions to calculate the anatomical joint angles from motion captured raw measurement data (also referred as inverse kinematics). In addition, recent developments in inertial motion sensing technology show that it may replace large, immobile and expensive optical systems with small, mobile and cheaper solutions in cases when a laboratory-free measurement setup is needed...
January 17, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28048909/su-f-p-36-automation-of-linear-accelerator-star-shot-measurement-with-advanced-xml-scripting-and-electronic-portal-imaging-device
#11
N Nguyen, N Knutson, M Schmidt, M Price
PURPOSE: To verify a method used to automatically acquire jaw, MLC, collimator and couch star shots for a Varian TrueBeam linear accelerator utilizing Developer Mode and an Electronic Portal Imaging Device (EPID). METHODS: An XML script was written to automate motion of the jaws, MLC, collimator and couch in TrueBeam Developer Mode (TBDM) to acquire star shot measurements. The XML script also dictates MV imaging parameters to facilitate automatic acquisition and recording of integrated EPID images...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048431/su-f-t-466-an-enhanced-daily-quality-assurance-process-for-a-six-degrees-of-freedom-robotic-table
#12
E Kremmel, L Doyle, Y Yu, A Harrison
PURPOSE: A Varian PerfectPitch six degrees of freedom robotic table necessitates daily quality assurance (QA). Therapists were credentialed for this QA procedure which was easily incorporated into the existing daily warmup process. This procedure adds depth to TG-142 requirements without additional morning time costs. METHODS: This PerfectPitch table QA introduces a consistent rotation of the QUASAR™ Penta-Guide phantom and requires automatic table corrections through image fusions...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048185/su-f-j-31-dual-energy-imaging-in-the-treatment-of-head-and-neck-tumors-a-phantom-study
#13
J Roeske, R Patel, M Surucu
PURPOSE: Organ motion, due to swallowing, can significantly affect the PTV margins used in head and neck patients. Evaluation of swallowing motion 2016 AAPM Annual Meeting Program Medical Physics, Vol. 43, No. 6, June 2016 3412 3412 may be performed using x-ray fluoroscopy. However, regions such as the soft palette and epiglottis may be difficult to visualize due to the presence of bone (mandible, teeth). The goal of this phantom study is to determine if dual energy (DE) subtraction would improve the visualization in these regions...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047650/th-ef-bra-09-direct-comparison-of-t2-based-respiratory-correlated-4dmri-reconstructed-from-simultaneous-internal-navigator-and-external-bellows
#14
G Li, D Olek, J Wei, M Kadbi, N Tyagi, K Zakian, J Mechalakos, J Deasy, M Hunt
PURPOSE: To optimize T2-based respiratory-correlated 4DMRI for motion simulation, we evaluated the image quality after 4D reconstruction based on the two respiratory surrogates acquired independently and concurrently during the same breathing period. METHODS: Both internal navigator and external bellows were employed simultaneously during a 4DMRI acquisition on seven volunteers scanned coronally and sagittally under an IRB-approved protocol. The navigator was positioned at the right diaphragm dome while the bellows was placed at the upper abdomen...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047616/su-g-iep1-08-mr-geometric-distortion-dependency-on-imaging-sequence-acquisition-orientation-and-receiver-bandwidth-of-a-dedicated-1-5t-mr-simulator
#15
M Law, J Yuan, O Wong, S Yu
PURPOSE: To investigate the 3D geometric distortion of four potential MR sequences for radiotheraptic applications, and its dependency on sequence-type, acquisition-orientation and receiver-bandwidth from a dedicated 1.5T 700mm-wide bore MR-simulator (Magnetom-Aera, Sienmens Healthcare, Erlangen, Germany), using a large customized geometric accuracy phantom. METHODS: This work studied 3D gradient-echo (VIBE) and spin-echo (SPACE) sequences for anatomical imaging; a specific ultra-short-TE sequence (PETRA) potentially for bone imaging and MR-based dosimetry; and a motion-insensitive sequence (BLADE) for dynamic applications like 4D-MRI...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047472/su-g-206-12-the-correlation-between-table-height-and-patient-size-in-ct-a-simple-way-to-properly-position-patients
#16
T Szczykutowicz, E Janssen-Saldivar, D Miller, A Malkus
PURPOSE: Proper patient positioning is essential in CT to ensure automatic exposure control functions properly, noise uniformity, and CT number uniformity. This work describes how table height can be used as a surrogate for proper patient positioning and motivates incorporating table height recommendations as a function of patient size into technologist training programs. METHODS: Scan data were acquired from 551 adult and pediatric patients under IRB approval. The table height, mean anterior-posterior patient dimension, and mean lateral patient dimension were calculated for each patient...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047439/su-f-j-132-evaluation-of-ctv-to-ptv-expansion-for-whole-breast-radiotherapy
#17
B Burgdorf, G Freedman, B Teo
PURPOSE: The current standard CTV-to-PTV expansion for whole breast radiotherapy (WBRT) is 7mm, as recommended by RTOG-1005.This expansion is derived from the uncertainty due to patient positioning (±5mm) and respiratory motion (±5mm). We evaluated the expansion needed for respiratory motion uncertainty using 4DCT. After determining the appropriate expansion margins, RT plans were generated to evaluate the reduction in heart and lung dose. METHODS: 4DCT images were acquired during treatment simulation and retrospectively analyzed for 34 WBRT patients...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047307/su-f-t-292-imaging-and-radiation-oncology-core-iroc-houston-qa-center-s-anthropomorphic-phantom-program
#18
H Mehrens, B Lewis, C Lujano, T Nguyen, N Hernandez, P Alvarez, A Molineu, D Followill
PURPOSE: To describe the results of IROC Houston's international and domestic end-to-end QA phantom irradiations. METHODS: IROC Houston has anthropomorphic lung, liver, head and neck, prostate, SRS and spine phantoms that are used for credentialing and quality assurance purposes. The phantoms include structures that closely mimic targets and organs at risk and are made from tissue equivalent materials: high impact polystyrene, solid water, cork and acrylic. Motion tables are used to mimic breathing motion for some lung and liver phantoms...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047054/su-f-p-32-a-phantom-study-of-accuracy-of-four-dimensional-cone-beam-ct-4d-cbct-vs-three-dimensional-cone-beam-ct-3d-cbct-in-image-guided-radiotherapy
#19
R He, B Morris, N Duggar, A Markovich, J Standford, J Lu, C Yang
PURPOSE: SymmetryTM 4D IGRT system of Elekta has been installed at our institution, which offers the 4D CBCT registration option. This study is to evaluate the accuracy of 4D CBCT system by using the CIRS 4D motion phantom and to perform a feasibility study on the implementation of 4D-CBCT as image guidance for SBRT treatment. METHODS: The 3D and 4D CT image data sets are acquired using the CIRS motion phantom on a Philips large bore CT simulator. The motion was set as 0...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046856/su-f-j-126-influence-of-six-dimensional-motions-in-frameless-stereotactic-dosimetry-incorporating-rotational-shifts-as-equivalent-translational-shifts-a-feasibility-study-for-elekta-brainlab-stereotactic-system
#20
B Sarkar, A Manikandan, K Jassal, T Ganesh, A Munshi, B Mohanti, A Pradhan
PURPOSE: Six dimensional positional shifts (translational and rotational) determined by a volumetric imaging system were mathematically combined and incorporated as simple translational shifts and the resultant impact on dose characteristics was studied. METHODS: Thirty patients who underwent either single fraction (12 Gy) or five fractions (5 Gy per fraction) stereotactic treatments were included in this study. They were immobilized using a double layered thermoplastic mask from BrainLAB...
June 2016: Medical Physics
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