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https://www.readbyqxmd.com/read/28227796/estimation-of-joint-center-and-measurement-of-finger-motion-by-inertial-sensors
#1
Keisuke Kitano, Akihito Ito, Nobutaka Tsujiuchi, Shigeru Wakida, Keisuke Kitano, Akihito Ito, Nobutaka Tsujiuchi, Shigeru Wakida, Akihito Ito, Shigeru Wakida, Keisuke Kitano, Nobutaka Tsujiuchi
The authors developed a wearable finger motion measurement system using inertial and geomagnetic sensors. Using this system, motion and posture of the hands and fingers can be measured. However, the joint center and segment axis cannot be accurately measured in a previous study using the sensors. Therefore, the authors proposed a method of estimating the joint center and segment lengths. This method utilizes the fact that the calculation formula of the rotational acceleration in the sensor's coordinate system is the vector product...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227540/a-preliminary-study-for-quantitative-assessment-of-upper-limb-proprioception
#2
Sara Contu, Asif Hussain, Lorenzo Masia, Domenico Campolo, Sara Contu, Asif Hussain, Lorenzo Masia, Domenico Campolo, Asif Hussain, Lorenzo Masia, Sara Contu, Domenico Campolo
Proprioception, or sense of position and movement of the body, strongly correlates with motor recovery of the hemiplegic arm. The evaluation of the awareness of the location of joints in space involves measuring the accuracy of joint-angle replication. Robotic devices allow an accurate manipulation of joint movements necessary to assess proprioceptive status. This study evaluated the proprioceptive performance of healthy subjects by mean of the H-Man, a planar robot designed for upper-limb rehabilitation to gather preliminary normative data for neurorehabilitation applications...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28203459/association-of-age-on-cervical-joint-position-error
#3
Khalid A Alahmari, Ravi Shankar Reddy, Paul S Silvian, Irshad Ahmad, Venkata Nagaraj Kakaraparthi, Mohammed Mehtab Alam
This study quantitatively assesses the association between age and cervical joint position error (JPE) and compares JPE between young and older asymptomatic subjects. Subjects (n = 230) ranging in age from 17 to 70 years volunteered to participate in the study. Cervical JPE was measured for all subjects with the active movement angle reproduction test in degrees using a digital inclinometer; testing was done in all cervical movement directions (flexion, extension, side-bending right and left, rotation right and left)...
May 2017: Journal of Advanced Research
https://www.readbyqxmd.com/read/28174442/three-dimensional-motion-analysis-in-the-elbow-joint-position-sense-in-children
#4
So-Young Hong, Chiang-Soon Song, Ki-Hoon Hong
[Purpose] The purpose of this study was to investigate the difference in elbow joint position sense in children. [Subjects and Methods] Nineteen healthy children volunteered as subjects for this study. Joint position sense was assessed by asking the children to flex their elbows between 30° to 110° while blindfolded. The error range of elbow movement was analyzed with Compact Measuring System 10 for three-dimensional motion. To analyze data, descriptive statistics and paired t-test analysis were performed by using IBM SPSS Statistics 20...
December 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28148659/variation-in-functional-pelvic-tilt-in-patients-undergoing-total-hip-arthroplasty
#5
J Pierrepont, G Hawdon, B P Miles, B O' Connor, J Baré, L R Walter, E Marel, M Solomon, S McMahon, A J Shimmin
AIMS: The pelvis rotates in the sagittal plane during daily activities. These rotations have a direct effect on the functional orientation of the acetabulum. The aim of this study was to quantify changes in pelvic tilt between different functional positions. PATIENTS AND METHODS: Pre-operatively, pelvic tilt was measured in 1517 patients undergoing total hip arthroplasty (THA) in three functional positions - supine, standing and flexed seated (the moment when patients initiate rising from a seated position)...
February 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28143654/is-the-instrumented-pointer-method-of-calibrating-anatomical-landmarks-in-3d-motion-analysis-reliable
#6
Gwenllian Fflur Tawy, Philip Rowe
Instrumented-pointers are often used to calibrate anatomical landmarks in biomechanical analyses. However, little is known about the effect of altering the orientation of the pointer during calibration on the co-ordinates recorded. Incorrect positioning of a landmark influences the axes created, and thus the kinematic data recorded. This study aimed to investigate the reliability of the pointer method for anatomical calibration. Two points were drawn onto a fixed box to resemble knee joint epicondyles, then a custom-made pointer was used to define the positions of these landmarks in three-dimensions...
January 19, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28133763/the-effects-of-patient-positioning-when-interpreting-ct-dose-metrics-a-phantom-study
#7
Rebecca M Marsh, Michael S Silosky
PURPOSE: Review of dose metrics as part of the routine evaluation of CT protocols has become commonplace and is required by the Joint Commission and the American College of Radiology for accreditation. Most CT quality assurance programs include a review of CTDIvol and/or SSDE, both of which are affected by changes in mAs and kV. mAs, and sometimes kV, are largely determined by the Tube Current Modulation (TCM) functions of the scanner. TCM, in turn, relies on localizer scans to provide an accurate estimate of patient size...
January 30, 2017: Medical Physics
https://www.readbyqxmd.com/read/28126884/pet-mr-imaging-in-the-presence-of-metal-implants-completion-of-the-attenuation-map-from-pet-emission-data
#8
Niccolo Fuin, Stefano Pedemonte, Onofrio Antonio Catalano, David Izquierdo-Garcia, Andrea Soricelli, Marco Salvatore, Keith Heberlein, Jacob M Hooker, Koen Van Leemput, Ciprian Catana
: We present a novel technique for accurate whole body attenuation correction (AC) in the presence of metallic endoprosthesis, on integrated non-time-of-flight (non-TOF) PET/MR imaging scanners. The proposed implant PET-based attenuation map completion (IPAC) method performs a joint reconstruction of radioactivity and attenuation from the emission data to determine the position, shape and linear attenuation coefficient (LAC) of metallic implants. METHODS: The initial estimate of the attenuation map is obtained using the MR Dixon-method currently available on the Siemens Biograph mMR scanner...
January 26, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28118694/musculoskeletal-disorders-of-the-upper-cervical-spine-in-women-with-episodic-or-chronic-migraine
#9
Gabriela N Ferracini, Lidiane L Florencio, Fabíola Dach, Débora Bevilaqua Grossi, María Palacios-Ceña, Carlos Ordás-Bandera, Thais C Chaves, José G Speciali, César Fernández-DE-Las-Peñas
BACKGROUND: The role of musculoskeletal disorders of the cervical spine in migraine is under debate. AIM: To investigate differences in musculoskeletal impairments of the neck including active global and upper cervical spine mobility, the presence of symptomatic upper cervical spine joints, cervicocephalic kinesthesia and head/neck posture between women with episodic migraine, chronic migraine, and controls. DESIGN: A cross-sectional study...
January 24, 2017: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28113621/an-expectation-maximization-method-for-joint-estimation-of-emission-activity-distribution-and-photon-attenuation-map-in-pet
#10
Alexander Mihlin, Craig Levin
A maximum likelihood expectation maximization (MLEM) method is proposed for joint estimation of emission activity distribution and photon attenuation map from positron emission tomography (PET) emission data alone. The method is appealing since: (i) it guarantees monotonic likelihood increase to a local extremum, (ii) does not require arbitrary parameters, and (iii) guarantees the positivity of the estimated distributions. Moreover, we propose a discrete Poisson data acquisition model and numerical algorithm for: (i) efficient graphics processing unit (GPU) based formulation, and (ii) a closed form exact solution for the MLEM update equations, which is essential for accurate and robust estimation...
August 24, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28112875/three-dimensional-assessment-of-impingement-risk-in-geometrically-parameterised-hips-compared-with-clinical-measures
#11
Robert J Cooper, Marlène Mengoni, Dawn Groves, Sophie Williams, Marcus J K Bankes, Philip Robinson, Alison C Jones
Abnormal bony morphology is a factor implicated in hip joint soft tissue damage and an increased lifetime risk of osteoarthritis. Standard two-dimensional radiographic measurements for diagnosis of hip deformities, such as cam deformities on the femoral neck, do not capture the full joint geometry and are not indicative of symptomatic damage. In this study, a three-dimensional geometric parameterisation system was developed to capture key variations in the femur and acetabulum of subjects with clinically diagnosed cam deformity...
January 23, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28099472/elastic-tape-improved-shoulder-joint-position-sense-in-chronic-hemiparetic-subjects-a-randomized-sham-controlled-crossover-study
#12
Gabriela Lopes Dos Santos, Matheus Bragança Souza, Kaat Desloovere, Thiago Luiz Russo
BACKGROUND: Elastic tape has been widely used in clinical practice in order to improve upper limb (UL) sensibility. However, there is little evidence that supports this type of intervention in stroke patients. OBJECTIVE: To verify the effect of elastic tape, applied to the paretic shoulder, on joint position sense (JPS) during abduction and flexion in subjects with chronic hemiparesis compared to sham tape (non-elastic tape). Furthermore, to verify if this potential effect is correlated to shoulder subluxation measurements and sensorimotor impairment...
2017: PloS One
https://www.readbyqxmd.com/read/28088244/study-of-the-variability-of-scapular-inclination-and-the-glenoid-version-considerations-for-preoperative-planning-clinical-radiological-study
#13
Petr Fulin, Martin Kysilko, David Pokorny, Radek Padr, Nikola Kasprikova, Ivan Landor, Antonin Sosna
BACKGROUND: Preoperative planning with the aid of imaging methods is a principal factor in successful surgery on the shoulder. This work aims to evaluate the variability of glenoid version, spiralling twist and scapular inclination in relation to the frontal axis. Studies focusing on measuring the variability of scapular inclination in the standardised rest position are lacking in the literature. METHODS: We evaluated 104 CT scans of the shoulder. We measured the glenoid version with respect to the scapular axis at three levels...
January 14, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28068293/a-hybrid-bmi-based-exoskeleton-for-paresis-emg-control-for-assisting-arm-movements
#14
Toshihiro Kawase, Takeshi Sakurada, Yasuharu Koike, Kenji Kansaku
OBJECTIVE: Brain-machine interface (BMI) technologies have succeeded in controlling robotic exoskeletons, enabling some paralyzed people to control their own arms and hands. We have developed an exoskeleton asynchronously controlled by EEG signals. In this study, to enable real-time control of the exoskeleton for paresis, we developed a hybrid system with EEG and EMG signals, and the EMG signals were used to estimate its joint angles. APPROACH: Eleven able-bodied subjects and two patients with upper cervical spinal cord injuries (SCIs) performed hand and arm movements, and the angles of the metacarpophalangeal (MP) joint of the index finger, wrist, and elbow were estimated from EMG signals using a formula that we derived to calculate joint angles from EMG signals, based on a musculoskeletal model...
January 9, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28060536/proprioception-in-patients-with-anterior-cruciate-ligament-tears
#15
Hyun-Jung Kim, Jin-Hyuck Lee, Dae-Hee Lee
BACKGROUND: Because of a reduction in the number of mechanoreceptors or alterations of their characteristics, anterior cruciate ligament (ACL) tears lead not only to mechanical instability but also to impaired proprioception. Purpose/Hypothesis: This study analyzed whether ACL tears cause a greater decrease in proprioception in injured than in uninjured knees. The hypothesis was that knee proprioception after ACL tears would decrease more in injured than in contralateral uninjured knees, regardless of the method used to measure knee proprioception...
December 1, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28048318/we-h-brc-06-a-unified-machine-learning-based-probabilistic-model-for-automated-anomaly-detection-in-the-treatment-plan-data
#16
X Chang, A Kalet, S Liu, D Yang
PURPOSE: The purpose of this work was to investigate the ability of a machine-learning based probabilistic approach to detect radiotherapy treatment plan anomalies given initial disease classes information. METHODS: In total we obtained 1112 unique treatment plans with five plan parameters and disease information from a Mosaiq treatment management system database for use in the study. The plan parameters include prescription dose, fractions, fields, modality and techniques...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047829/th-ab-201-07-filmless-treatment-localization-qa-for-the-cyberknife-system
#17
J Gersh, M Noll
PURPOSE: Accuray recommends daily evaluation of the treatment localization and delivery systems (TLS/TDS) of the CyberKnife. The vendor-provided solution is a Winston-Lutz-type test that evaluates film shadows from an orthogonal beam pair (known as AQA). Since film-based techniques are inherently inefficient and potentially inconsistent and uncertain, this study explores a method which provides a comparable test with greater efficiency, consistency, and certainty. This test uses the QAStereoChecker (QASC, Standard Imaging, Inc...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047228/th-ab-202-05-best-in-physics-joint-imaging-therapy-first-online-ultrasound-guided-mlc-tracking-for-real-time-motion-compensation-in-radiotherapy
#18
S Ipsen, R Bruder, R O'Brien, P Keall, A Schweikard, P Poulsen
PURPOSE: While MLC tracking has been successfully used for motion compensation of moving targets, current real-time target localization methods rely on correlation models with x-ray imaging or implanted electromagnetic transponders rather than direct target visualization. In contrast, ultrasound imaging yields volumetric data in real-time (4D) without ionizing radiation. We report the first results of online 4D ultrasound-guided MLC tracking in a phantom. METHODS: A real-time tracking framework was installed on a 4D ultrasound station (Vivid7 dimension, GE) and used to detect a 2mm spherical lead marker inside a water tank...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28026745/wearable-vector-electrical-bioimpedance-system-to-assess-knee-joint-health
#19
Sinan Hersek, Hakan Toreyin, Caitlin N Teague, Mindy L Millard-Stafford, Hyeon-Ki Jeong, Miheer M Bavare, Paul Wolkoff, Michael N Sawka, Omer T Inan
: We designed and validated a portable electrical bioimpedance (EBI) system to quantify knee joint health. METHODS: Five separate experiments were performed to demonstrate the: (1) ability of the EBI system to assess knee injury and recovery; (2) inter-day variability of knee EBI measurements; (3) sensitivity of the system to small changes in interstitial fluid volume; (4) reducing the error of EBI measurements using acceleration signals; (5) use of the system with dry electrodes integrated to a wearable knee wrap...
December 22, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28024426/across-subject-calibration-of-an-instrumented-glove-to-measure-hand-movement-for-clinical-purposes
#20
Verónica Gracia-Ibáñez, Margarita Vergara, James H Buffi, Wendy M Murray, Joaquín L Sancho-Bru
Motion capture of all degrees of freedom of the hand collected during performance of daily living activities remains challenging. Instrumented gloves are an attractive option because of their higher ease of use. However, subject-specific calibration of gloves is lengthy and has limitations for individuals with disabilities. Here, a calibration procedure is presented, consisting in the recording of just a simple hand position so as to allow capture of the kinematics of 16 hand joints during daily life activities even in case of severe injured hands...
December 27, 2016: Computer Methods in Biomechanics and Biomedical Engineering
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