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https://www.readbyqxmd.com/read/28323840/htc-vive-mevislab-integration-via-openvr-for-medical-applications
#1
Jan Egger, Markus Gall, Jürgen Wallner, Pedro Boechat, Alexander Hann, Xing Li, Xiaojun Chen, Dieter Schmalstieg
Virtual Reality, an immersive technology that replicates an environment via computer-simulated reality, gets a lot of attention in the entertainment industry. However, VR has also great potential in other areas, like the medical domain, Examples are intervention planning, training and simulation. This is especially of use in medical operations, where an aesthetic outcome is important, like for facial surgeries. Alas, importing medical data into Virtual Reality devices is not necessarily trivial, in particular, when a direct connection to a proprietary application is desired...
2017: PloS One
https://www.readbyqxmd.com/read/28303213/3d-nanomolding-and-fluid-mixing-in-micromixers-with-micro-patterned-microchannel-walls
#2
Bahador Farshchian, Alborz Amirsadeghi, Junseo Choi, Daniel S Park, Namwon Kim, Sunggook Park
Microfluidic devices where the microchannel walls were decorated with micro and nanostructures were fabricated using 3D nanomolding. Using 3D molded microfluidic devices with microchannel walls decorated with microscale gratings, the fluid mixing behavior was investigated through experiments and numerical simulation. The use of microscale gratings in the micromixer was predicated by the fact that large obstacles in a microchannel enhances the mixing performance. Slanted ratchet gratings on the channel walls resulted in a helical flow along the microchannel, thus increasing the interfacial area between fluids and cutting down the diffusion length...
2017: Nano Converg
https://www.readbyqxmd.com/read/28275889/automatic-anatomical-labeling-of-arteries-and-veins-using-conditional-random-fields
#3
Takayuki Kitasaka, Mitsuru Kagajo, Yukitaka Nimura, Yuichiro Hayashi, Masahiro Oda, Kazunari Misawa, Kensaku Mori
PURPOSE: For safe and reliable laparoscopic surgery, it is important to determine individual differences of blood vessels such as the position, shape, and branching structures. Consequently, a computer-assisted laparoscopy that displays blood vessel structures with anatomical labels would be extremely beneficial. This paper details an automated anatomical labeling method for abdominal arteries and veins extracted from 3D CT volumes. METHODS: The proposed method represents a blood vessel tree as a probabilistic graphical model by conditional random fields (CRFs)...
March 8, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28269466/heart-activity-monitoring-using-3d-hologram-based-on-smartphone
#4
Tharoeun Thap, Heewon Chung, Jinseok Lee
In this paper, we used smartphone to obtained pulsatile signal from a fingertip by illuminating the skin tissue using flashlight and with an on-board camera to record the change of the light intensity reflected from the tissue. The pulsatile signal is produced by analyzing average green component values of the frames taken by the camera and the heart rate is estimated in real time by detecting the pulse peaks. Based on each instant obtained heartbeat, we design a heart animation that beats according to each interval of the heartbeat...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269245/a-low-cost-3-d-printed-stethoscope-connected-to-a-smartphone
#5
Carlos Aguilera-Astudillo, Marx Chavez-Campos, Alan Gonzalez-Suarez, Jose L Garcia-Cordero
We demonstrate the fabrication of a digital stethoscope using a 3D printer and commercial off-the-shelf electronics. A chestpiece consists of an electret microphone embedded into the drum of a 3D printed chestpiece. An electronic dongle amplifies the signal from the microphone and reduces any external noise. It also adjusts the signal to the voltages accepted by the smartphones headset jack. A graphical user interface programmed in Android displays the signals processed by the dongle. The application also saves the processed signal and sends it to a physician...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269009/fundamentals-of-left-ventricular-volume-representation
#6
Peter L Kerkhof
The volume regulation graph is meant to relate the fundamental determinants of left ventricular (LV) function, namely end-systolic volume (ESV) and end-diastolic volume (EDV). This representation permits evaluation of the LV remodeling process, convenient stratification for clinically relevant covariates, as well as inscription of iso-stroke volume (SV) and iso-ejection fraction (EF) trajectories, the latter two as linear relationships. This retrospective study discusses LV volumetric parameters obtained from 155 patients (65 females) covering a wide spectrum of heart diseases...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268550/surgical-fiducial-segmentation-and-tracking-for-pose-estimation-based-on-ultrasound-b-mode-images
#7
Lei Chen, Nathanael Kuo, Fereshteh Aalamifar, David Narrow, Devin Coon, Jerry Prince, Emad M Boctor
Doppler ultrasound is a non-invasive diagnostic tool for the quantitative measurement of blood flow. However, given that it provides velocity data that is dependent on the location and angle of measurement, repeat measurements to detect problems over time may require an expert to return to the same location. We therefore developed an image-guidance system based on ultrasound B-mode images that enables an inexperienced user to position the ultrasound probe at the same site repeatedly in order to acquire a comparable time series of Doppler readings...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28267884/microscopic-dual-energy-ct-microdect-a-flexible-tool-for-multichannel-ex-vivo-3d-imaging-of-biological-specimens
#8
S Handschuh, C J Beisser, B Ruthensteiner, B D Metscher
Dual-energy computed tomography (DECT) uses two different x-ray energy spectra in order to differentiate between tissues, materials or elements in a single sample or patient. DECT is becoming increasingly popular in clinical imaging and preclinical in vivo imaging of small animal models, but there have been only very few reports on ex vivo DECT of biological samples at microscopic resolutions. The present study has three main aims. First, we explore the potential of microscopic DECT (microDECT) for delivering isotropic multichannel 3D images of fixed biological samples with standard commercial laboratory-based microCT setups at spatial resolutions reaching below 10 μm...
March 7, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28245553/an-effective-3d-shape-descriptor-for-object-recognition-with-rgb-d-sensors
#9
Zhong Liu, Changchen Zhao, Xingming Wu, Weihai Chen
RGB-D sensors have been widely used in various areas of computer vision and graphics. A good descriptor will effectively improve the performance of operation. This article further analyzes the recognition performance of shape features extracted from multi-modality source data using RGB-D sensors. A hybrid shape descriptor is proposed as a representation of objects for recognition. We first extracted five 2D shape features from contour-based images and five 3D shape features over point cloud data to capture the global and local shape characteristics of an object...
February 24, 2017: Sensors
https://www.readbyqxmd.com/read/28229236/asymmetric-bone-remodeling-in-mandibular-and-maxillary-tori
#10
Jean-Daniel Kün-Darbois, Bernard Guillaume, Daniel Chappard
OBJECTIVES: Tori are frequent paucisymptomatic bony outgrowths of the oral cavity in three locations: torus palatinus (TP), mandibularis (TM), and maxillaris (TMax). Their usually described histological characteristics are unspecific: normal cortical bone with more or less trabecular bone. The aim of this study was to describe tori's specific morphological and histomorphometric characteristics. MATERIALS AND METHODS: Histological characteristics in a series of 18 tori collected after surgical removal were analyzed...
February 23, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28227716/heart-activity-monitoring-using-3d-hologram-based-on-smartphone
#11
Tharoeun Thap, Heewon Chung, Jinseok Lee, Tharoeun Thap, Heewon Chung, Jinseok Lee, Tharoeun Thap, Jinseok Lee, Heewon Chung
In this paper, we used smartphone to obtained pulsatile signal from a fingertip by illuminating the skin tissue using flashlight and with an on-board camera to record the change of the light intensity reflected from the tissue. The pulsatile signal is produced by analyzing average green component values of the frames taken by the camera and the heart rate is estimated in real time by detecting the pulse peaks. Based on each instant obtained heartbeat, we design a heart animation that beats according to each interval of the heartbeat...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227479/a-low-cost-3-d-printed-stethoscope-connected-to-a-smartphone
#12
Carlos Aguilera-Astudillo, Marx Chavez-Campos, Alan Gonzalez-Suarez, Jose L Garcia-Cordero, Carlos Aguilera-Astudillo, Marx Chavez-Campos, Alan Gonzalez-Suarez, Jose L Garcia-Cordero, Jose L Garcia-Cordero, Alan Gonzalez-Suarez, Marx Chavez-Campos
We demonstrate the fabrication of a digital stethoscope using a 3D printer and commercial off-the-shelf electronics. A chestpiece consists of an electret microphone embedded into the drum of a 3D printed chestpiece. An electronic dongle amplifies the signal from the microphone and reduces any external noise. It also adjusts the signal to the voltages accepted by the smartphones headset jack. A graphical user interface programmed in Android displays the signals processed by the dongle. The application also saves the processed signal and sends it to a physician...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227221/fundamentals-of-left-ventricular-volume-representation
#13
Peter L Kerkhof, Peter L Kerkhof, Peter L Kerkhof
The volume regulation graph is meant to relate the fundamental determinants of left ventricular (LV) function, namely end-systolic volume (ESV) and end-diastolic volume (EDV). This representation permits evaluation of the LV remodeling process, convenient stratification for clinically relevant covariates, as well as inscription of iso-stroke volume (SV) and iso-ejection fraction (EF) trajectories, the latter two as linear relationships. This retrospective study discusses LV volumetric parameters obtained from 155 patients (65 females) covering a wide spectrum of heart diseases...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226727/surgical-fiducial-segmentation-and-tracking-for-pose-estimation-based-on-ultrasound-b-mode-images
#14
Lei Chen, Nathanael Kuo, Fereshteh Aalamifar, David Narrow, Devin Coon, Jerry Prince, Emad M Boctor, Lei Chen, Nathanael Kuo, Fereshteh Aalamifar, David Narrow, Devin Coon, Jerry Prince, Emad M Boctor, David Narrow, Emad M Boctor, Devin Coon, Lei Chen, Jerry Prince, Nathanael Kuo, Fereshteh Aalamifar
Doppler ultrasound is a non-invasive diagnostic tool for the quantitative measurement of blood flow. However, given that it provides velocity data that is dependent on the location and angle of measurement, repeat measurements to detect problems over time may require an expert to return to the same location. We therefore developed an image-guidance system based on ultrasound B-mode images that enables an inexperienced user to position the ultrasound probe at the same site repeatedly in order to acquire a comparable time series of Doppler readings...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28224379/nerves-of-steel-a-low-cost-method-for-3d-printing-the-cranial-nerves
#15
Ramin Javan, Duncan Davidson, Afshin Javan
Steady-state free precession (SSFP) magnetic resonance imaging (MRI) can demonstrate details down to the cranial nerve (CN) level. High-resolution three-dimensional (3D) visualization can now quickly be performed at the workstation. However, we are still limited by visualization on flat screens. The emerging technologies in rapid prototyping or 3D printing overcome this limitation. It comprises a variety of automated manufacturing techniques, which use virtual 3D data sets to fabricate solid forms in a layer-by-layer technique...
February 21, 2017: Journal of Digital Imaging: the Official Journal of the Society for Computer Applications in Radiology
https://www.readbyqxmd.com/read/28207388/segmentation-of-pathological-structures-by-landmark-assisted-deformable-models
#16
Bulat Ibragimov, Robert Korez, Bostjan Likar, Franjo Pernus, Lei Xing, Tomaz Vrtovec
Computerized segmentation of pathological structures in medical images is challenging, as, in addition to unclear image boundaries, image artifacts and traces of surgical activities, the shape of pathological structures may be very different from the shape of normal structures. Even if a sufficient number of pathological training samples are collected, statistical shape modeling cannot always capture shape features of pathological samples as they may be suppressed by shape features of a considerably larger number of healthy samples...
February 13, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28198568/compressed-sensing-mri-reconstruction-from-3d-multichannel-data-using-gpus
#17
Ching-Hua Chang, Xiangdong Yu, Jim X Ji
PURPOSE: To accelerate iterative reconstructions of compressed sensing (CS) MRI from 3D multichannel data using graphics processing units (GPUs). METHODS: The sparsity of MRI signals and parallel array receivers can reduce the data acquisition requirements. However, iterative CS reconstructions from data acquired using an array system may take a significantly long time, especially for a large number of parallel channels. This paper presents an efficient method for CS-MRI reconstruction from 3D multichannel data using GPUs...
February 15, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28191844/armsd-a-comprehensive-tool-for-structural-analysis
#18
Arne Wagner, Hans-Joerg Himmel
A new tool for structural comparison is presented that combines existing and new features into a single software package. aRMSD incorporates the functions of establishing a pair-wise correlation between the atoms of two molecular structures and the calculation of the optimal rotation matrix that minimizes the RMSD between the molecules. The complexity of the Hungarian assignation problem is reduced by decomposing molecules into different subsets based on different atom or group types allowing for an efficient and robust treatment of large molecules while tolerating different substituents...
February 13, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28176265/deformation-of-facial-model-for-complete-denture-prosthesis-using-arap-group-method-and-elastic-properties
#19
Cheng Cheng, Xiaosheng Cheng, Ning Dai, Yuchun Sun, Xiaotong Jiang, Weiwei Li
With the development of 3D printing and computer graphics technology, mouth rehabilitation has increasingly adopted digital methods. This research proposes a new method to transform the appearance of facial model after complete denture prosthesis. A feature template with few feature points is first constructed according to the facial muscle anatomy and facial deformation after complete denture prosthesis. Next, the traditional as-rigid-as-possible (ARAP) method is optimised by clustering based on facial muscles...
February 7, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28168640/3d-computer-graphical-anatomy-study-of-the-femur-a-basis-for-a-new-nail-design
#20
Beat Schmutz, Stanley Kmiec, Martin E Wullschleger, Martin Altmann, Michael Schuetz
BACKGROUND: Current intramedullary nails with a radius of curvature (ROC) of 1500-2000 mm sometimes cause distal anterior cortical encroachment. Furthermore, clinical data indicate that the proximal nail end is too long for some Asian patients. The objective of our study was to develop a comprehensive 3D measurement protocol that measures both the anatomy of the canal and the proximal region. The protocol was used to obtain measurements from Caucasian and Asian (Japanese and Thai) specimens...
March 2017: Archives of Orthopaedic and Trauma Surgery
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