Three-Dimensional Shaded Surface Reconstructions of Cardiac and Paracardiac Structures

1992 ◽  
pp. 481-485
Author(s):  
Ralf Hammentgen ◽  
Stephan el-Gammal
Keyword(s):  
Three Dimensional ◽  
Surface Reconstructions

Localization of hand sensory function to the pli de passage moyen of Broca

2004 ◽  
Vol 101 (2) ◽  
pp. 278-283 ◽  
Author(s):  
Warren W. Boling ◽  
André Olivier
Keyword(s):  
Three Dimensional ◽  
Central Area ◽  
Sensory Function ◽  
Content Type ◽  
Positron Emission ◽  
Surface Reconstructions ◽  
Highly Correlated ◽  
Sensory Activation ◽  
Pet Scans ◽  
Fine Print

Object. The goal of this study was to identify a reliable landmark for hand sensory function in the central area. Methods. Hand sensory activation on positron emission tomography (PET) scans was analyzed in 27 patients. Each PET study was coregistered with the patient's magnetic resonance image and analyzed in two-dimensional and three-dimensional cortical surface reconstructions to define anatomicofunctional relationships. Conclusions. The substratum of hand sensory function is a prominent fold of cortex elevating the floor of the central sulcus and connecting the pre- and postcentral gyri. Broca named this cortical fold the pli de passage moyen, and hand motor function has been localized to the precentral component of this structure. In this study the authors demonstrate that hand sensory function is highly correlated with the postcentral component of the pli de passage moyen, and that this structure is a reliable cortical landmark for identifying the aforementioned function.

Musculoskeletal Applications of Three-Dimensional Surface Reconstructions

1985 ◽  
Vol 16 (3) ◽  
pp. 543-555 ◽  
Author(s):  
Michael W. Vannier ◽  
William G. Totty ◽  
W. Grant Stevens ◽  
Paul M. Weeks ◽  
Daniel M. Dye ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Surface Reconstructions ◽  
Dimensional Surface

Localisation of intracranial EEG electrodes using three dimensional surface reconstructions of the brain

1994 ◽  
Vol 4 (1) ◽  
Author(s):  
K. Bootsveld ◽  
F. Tr�ber ◽  
W.A. Kaiser ◽  
G. Layer ◽  
C.E. Elger ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Intracranial Eeg ◽  
Surface Reconstructions ◽  
The Brain ◽  
Dimensional Surface

scholarly journals Hydrodynamic drag constrains head enlargement for mouthbrooding in cichlids

2015 ◽  
Vol 12 (109) ◽  
pp. 20150461 ◽  
Author(s):  
Sam Van Wassenbergh ◽  
Nuno Zavattieri Potes ◽  
Dominique Adriaens
Keyword(s):  
Drag Force ◽  
Three Dimensional ◽  
Cichlid Fish ◽  
Hydrodynamic Drag ◽  
Head Width ◽  
Body Volume ◽  
Surface Reconstructions ◽  
Dimensional Shape ◽  
Dynamics Simulations ◽  
External Volume

Presumably as an adaptation for mouthbrooding, many cichlid fish species have evolved a prominent sexual dimorphism in the adult head. Since the head of fishes serves as a bow during locomotion, an evolutionary increase in head volume to brood more eggs can trade-off with the hydrodynamic efficiency of swimming. Here, the differences between males and females in three-dimensional shape and size of the external head surfaces and the effect thereof on drag force during locomotion was analysed for the Nile tilapia ( Oreochromis niloticus ), a maternal mouthbrooder. To do so, three-dimensional body surface reconstructions from laser scans and computational fluid dynamics simulations were performed. After scaling the scanned specimens to post-cranial body volume, in order to theoretically equalize propulsive power, the external volume of the head of females was 27% larger than that of males (head length + 14%; head width + 9%). These differences resulted in an approximate 15% increase in drag force. Yet, hydrodynamics imposed important constraints on the adaptation for mouthbrooding as a much more drastic drop in swimming efficiency seems avoided by mainly enlarging the head along the swimming direction.

scholarly journals Smartphone: An alternative to ground control points for orienting virtual outcrop models and assessing their quality

Geosphere ◽  
2019 ◽  
Vol 15 (6) ◽  
pp. 2043-2052 ◽  
Author(s):  
Stefano Tavani ◽  
Amerigo Corradetti ◽  
Pablo Granado ◽  
Marco Snidero ◽  
Thomas D. Seers ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Image Data ◽  
Ground Control ◽  
Control Points ◽  
Positional Accuracy ◽  
Ground Control Points ◽  
Test Models ◽  
Surface Reconstructions ◽  
The Cost ◽  
Range Error

Abstract The application of structure from motion–multiview stereo (SfM-MVS) photogrammetry to map metric- to hectometric-scale exposures facilitates the production of three-dimensional (3-D) surface reconstructions with centimeter resolution and range error. In order to be useful for geospatial data interrogation, models must be correctly located, scaled, and oriented, which typically requires the geolocation of manually positioned ground control points with survey-grade accuracy. The cost and operational complexity of portable tools capable of achieving such positional accuracy and precision is a major obstacle in the routine deployment of SfM-MVS photogrammetry in many fields, including geological fieldwork. Here, we propose a procedure to overcome this limitation and to produce satisfactorily oriented models, which involves the use of photo orientation information recorded by smartphones. Photos captured with smartphones are used to: (1) build test models for evaluating the accuracy of the method, and (2) build smartphone-derived models of outcrops, used to reference higher-resolution models reconstructed from image data collected using digital single-lens reflex (DSLR) and mirrorless cameras. Our results are encouraging and indicate that the proposed workflow can produce registrations with high relative accuracies using consumer-grade smartphones. We also find that comparison between measured and estimated photo orientation can be successfully used to detect errors and distortions within the 3-D models.

scholarly journals Permafrost Terrain Dynamics and Infrastructure Impacts Revealed by UAV Photogrammetry and Thermal Imaging

2018 ◽  
Vol 10 (11) ◽  
pp. 1734 ◽  
Author(s):  
Jurjen van der Sluijs ◽  
Steven Kokelj ◽  
Robert Fraser ◽  
Jon Tunnicliffe ◽  
Denis Lacelle
Keyword(s):  
Remote Sensing ◽  
Time Series ◽  
Case Studies ◽  
Thermal Imaging ◽  
Three Dimensional ◽  
Ground Ice ◽  
Terrain Models ◽  
Surface Reconstructions ◽  
Elevation Model ◽  
Volume Estimates

Unmanned Aerial Vehicle (UAV) systems, sensors, and photogrammetric processing techniques have enabled timely and highly detailed three-dimensional surface reconstructions at a scale that bridges the gap between conventional remote-sensing and field-scale observations. In this work 29 rotary and fixed-wing UAV surveys were conducted during multiple field campaigns, totaling 47 flights and over 14.3 km2, to document permafrost thaw subsidence impacts on or close to road infrastructure in the Northwest Territories, Canada. This paper provides four case studies: (1) terrain models and orthomosaic time series revealed the morphology and daily to annual dynamics of thaw-driven mass wasting phenomenon (retrogressive thaw slumps; RTS). Scar zone cut volume estimates ranged between 3.2 × 103 and 5.9 × 106 m3. The annual net erosion of RTS surveyed ranged between 0.35 × 103 and 0.39 × 106 m3. The largest RTS produced a long debris tongue with an estimated volume of 1.9 × 106 m3. Downslope transport of scar zone and embankment fill materials was visualized using flow vectors, while thermal imaging revealed areas of exposed ground ice and mobile lobes of saturated, thawed materials. (2) Stratigraphic models were developed for RTS headwalls, delineating ground-ice bodies and stratigraphic unconformities. (3) In poorly drained areas along road embankments, UAV surveys detected seasonal terrain uplift and settlement of up to 0.5 m (>1700 m2 in extent) as a result of injection ice development. (4) Time series of terrain models highlighted the thaw-driven evolution of a borrow pit (6.4 × 105 m3 cut volume) constructed in permafrost terrain, whereby fluvial and thaw-driven sediment transfer (1.1 and 3.9 × 103 m3 a−1 respectively) was observed and whereby annual slope profile reconfiguration was monitored to gain management insights concerning site stabilization. Elevation model vertical accuracies were also assessed as part of the case studies and ranged between 0.02 and 0.13 m Root Mean Square Error, whereby photogrammetric models processed with Post-processed Kinematic image solutions achieved similar accuracies without ground control points over much larger and complex areas than previously reported. The high resolution of UAV surveys, and the capacity to derive quantitative time series provides novel insights into permafrost processes that are otherwise challenging to study. The timely emergence of these tools bridges field-based research and applied studies with broad-scale remote-sensing approaches during a period when climate change is transforming permafrost environments.

scholarly journals Accuracy Assessment of Three-dimensional Surface Reconstructions of In vivo Teeth from Cone-beam Computed Tomography

2016 ◽  
Vol 129 (12) ◽  
pp. 1464-1470 ◽  
Author(s):  
Yan-Hui Sang ◽  
Hong-Cheng Hu ◽  
Song-He Lu ◽  
Yu-Wei Wu ◽  
Wei-Ran Li ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Accuracy Assessment ◽  
Three Dimensional ◽  
Cone Beam ◽  
Surface Reconstructions ◽  
Dimensional Surface

scholarly journals A time-domain probe method for three-dimensional rough surface reconstructions

2009 ◽  
Vol 3 (2) ◽  
pp. 259-274 ◽  
Author(s):  
Corinna Burkard ◽  
◽  
Roland Potthast
Keyword(s):  
Rough Surface ◽  
Time Domain ◽  
Three Dimensional ◽  
Probe Method ◽  
Surface Reconstructions
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