scholarly journals Hands-On Deformation of Volumetric Anatomical Imageson a Touchscreen

2021 ◽  
Vol 11 (20) ◽  
pp. 9502
Author(s):  
Rosell Torres ◽  
Alejandro Rodríguez ◽  
Miguel Otaduy
Keyword(s):  
Visual Inspection ◽  
Resonance Imaging ◽  
Time Deformation ◽  
Hands On ◽  
Computed Tomography Scans ◽  
Volumetric Images ◽  
Anatomical Images ◽  
3D Volume ◽  
Intuitive Manner ◽  
Selection Of

In this work, we propose a novel metaphor to interact with volumetric anatomical images, e.g., magnetic resonance imaging or computed tomography scans. Beyond simple visual inspection, we empower users to reach the visible anatomical elements directly with their hands, and then move and deform them through natural gestures, while respecting the mechanical behavior of the underlying anatomy. This interaction metaphor relies on novel technical methods that address three major challenges: selection of anatomical elements in volumetric images, mapping of 2D manipulation gestures to 3D transformations, and real-time deformation of the volumetric images. All components of the interaction metaphor have been designed to capture the user’s intent in an intuitive manner, solving the mapping from the 2D touchscreen to the visible elements of the 3D volume. As a result, users have the ability to interact with medical volume images much like they would do with physical anatomy, directly with their hands.

scholarly journals Identification and analysis of pathological defect appearance in superstructures of reinforced-concrete bridges in Chapare region, Bolivia

DYNA ◽  
2021 ◽  
Vol 88 (216) ◽  
pp. 15-21
Author(s):  
Joaquin Humberto Aquino Rocha ◽  
Rolando Ibarra Villanueva
Keyword(s):  
Visual Inspection ◽  
Structural Characteristics ◽  
Concrete Bridges ◽  
High Humidity ◽  
Carbonation Depth ◽  
Carbonation Process ◽  
Reinforced Concrete Bridges ◽  
Inspection And Maintenance ◽  
Core Extraction ◽  
Selection Of

The objective of this article is to identify and analyze the main pathological manifestations in bridges in the Chapare - Bolivia region, an area characterized by high humidity and constant rainfall throughout the year. The methodology consisted of the selection of five bridges that showed evident signs of deterioration, in which a visual inspection was carried out and, subsequently, different tests: sclerometer, carbonation depth, penetration of chlorides and core extraction. All the bridges present advanced states of deterioration; highlighting corrosion as the main problem, generating detachment of the concrete and risk of collapse. Although the concrete has a compression strength greater than 30 MPa, the existing carbonation process and the different problems encountered compromises it. It is necessary that the entities in charge provide inspection and maintenance programs according to the environmental and structural characteristics of each bridge.

scholarly journals About the QSOs contained in the Cerro el Roble Survey and the density of UVX-QSOs in the SGP field

1986 ◽  
Vol 119 ◽  
pp. 49-50
Author(s):  
Luis E. Campusano
Keyword(s):  
Visual Inspection ◽  
The Other ◽  
Small Areas ◽  
The Third ◽  
Machine Selection ◽  
Objective Prism ◽  
Selection Of

A region containing the SGP, centered at α 00h 53m (1950) δ −28°03', is becoming a selected region for QSO research. Three lists of QSO candidates have been published for this field. One consists of candidates discovered visually on an objective prism plate, selected in a 25-deg2 area and with B(lim) ⋍ 20 mag (Clowes and Savage, 1983; the CS sample). The other list came from visual inspection of U and B plates (UVX stars), covering a region of 44-deg2 and with approximately the same limiting magnitude of the CS sample (Campusano and Torres, 1983; the CT sample). The third survey of QSO-candidates involved a machine selection of UVX stars (Shanks et al., 1983), whose published components correspond to two small areas of 1.6 and 8.2 deg2 with B(lim) = 19 mag (Boyle et al., 1985).

scholarly journals Hypoxia-Induced Acute Mountain Sickness is Associated with Intracellular Cerebral Edema: A 3 T Magnetic Resonance Imaging Study

2007 ◽  
Vol 28 (1) ◽  
pp. 198-206 ◽  
Author(s):  
Guus G Schoonman ◽  
Peter S Sándor ◽  
Arto C Nirkko ◽  
Thomas Lange ◽  
Thomas Jaermann ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Cerebral Edema ◽  
Diffusion Coefficients ◽  
Visual Inspection ◽  
Acute Mountain Sickness ◽  
Cerebral White Matter ◽  
Resonance Imaging ◽  
Apparent Diffusion Coefficients ◽  
Apparent Diffusion ◽  
Mountain Sickness

Acute mountain sickness is common among not acclimatized persons ascending to high altitude; the underlying mechanism is unknown, but may be related to cerebral edema. Nine healthy male students were studied before and after 6-h exposure to isobaric hypoxia. Subjects inhaled room air enriched with N2 to obtain arterial O2 saturation values of 75 to 80%. Acute mountain sickness was assessed with the environmental symptom questionnaire, and cerebral edema with 3 T magnetic resonance imaging in 18 regions of interest in the cerebral white matter. The main outcome measures were development of intra- and extracellular cerebral white matter edema assessed by visual inspection and quantitative analysis of apparent diffusion coefficients derived from diffusion-weighted imaging, and B0 signal intensities derived from T2-weighted imaging. Seven of nine subjects developed acute mountain sickness. Mean apparent diffusion coefficient increased 2.12% (baseline, 0.80±0.09; 6 h hypoxia, 0.81 ± 0.09; P = 0.034), and mean B0 signal intensity increased 4.56% (baseline, 432.1 ±98.2; 6 h hypoxia, 450.7 ± 102.5; P < 0.001). Visual inspection of magnetic resonance images failed to reveal cerebral edema. Cerebral acute mountain sickness scores showed a negative correlation with relative changes of apparent diffusion coefficients ( r = 0.83, P = 0.006); there was no correlation with relative changes of B0 signal intensities. In conclusion, isobaric hypoxia is associated with mild extracellular (vasogenic) cerebral edema irrespective of the presence of acute mountain sickness in most subjects, and severe acute mountain sickness with additional mild intracellular (cytotoxic) cerebral edema.

Alteration Features of Stones Applied in Underground Metro Stations

2010 ◽  
Vol 636-637 ◽  
pp. 1292-1299 ◽  
Author(s):  
Carlos Alves ◽  
Carlos Figueiredo ◽  
Paula Figueiredo ◽  
António Maurício ◽  
Luís Aires-Barros
Keyword(s):  
Field Study ◽  
Visual Inspection ◽  
Rock Type ◽  
Surface Irregularity ◽  
Non Invasive ◽  
Stone Materials ◽  
Complete Study ◽  
Stone Characteristics ◽  
Non Destructive ◽  
Selection Of

Several types of stones (igneous, sedimentary and metamorphic) are found applied in pavements, stairs and walls of the underground stations of the Lisbon Metropolitan System, Portugal. A field study based solely on non-destructive and non invasive visual inspection of these stations is presented, aiming to identify different transformations of applied stones and discuss its relation with the stone characteristics. This field study has pointed to relevant issues regarding durability of stone materials namely when used in pavements and stairs. The most striking aspect is the frequently marked variable behaviour of stones from a given rock type under the same use conditions, with heterogeneities and discontinuities that seem to cause irregularity from the early stages and further increase with time, having more accentuated consequences (in terms of intensity of surface irregularity) in some types of limestones. The observations collected could be relevant for the discussion of characteristics relevant for the quality control of these materials (namely at the quarry level), including the selection of stones for future substitutions. There is, therefore, the need for a more complete study comprising detailed petrographic studies and laboratory tests both from the applied stones and from the supplying quarries.

scholarly journals The Utility of Diffusion and Perfusion Magnetic Resonance Imaging in Target Delineation of High-Grade Gliomas

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Qian Fei ◽  
Lu-Xi Qian ◽  
Yu-Jie Zhang ◽  
Wen-Jie Guo ◽  
Xiu-Hua Bian ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Overall Survival ◽  
Magnetic Resonance ◽  
Target Volume ◽  
Perfusion Magnetic Resonance Imaging ◽  
Target Area ◽  
High Grade ◽  
Resonance Imaging ◽  
Failure Patterns ◽  
Selection Of

Background. The tumor volume of high-grade glioma (HGG) after surgery is usually determined by contrast-enhanced MRI (CE-MRI), but the clinical target volume remains controversial. Functional magnetic resonance imaging (multimodality MRI) techniques such as magnetic resonance perfusion-weighted imaging (PWI) and diffusion-tensor imaging (DTI) can make up for CE-MRI. This study explored the survival outcomes and failure patterns of patients with HGG by comparing the combination of multimodality MRI and CE-MRI imaging with CE-MRI alone. Methods. 102 patients with postoperative HGG between 2012 and 2016 were included. 50 were delineated based on multimodality MRI (PWI, DTI) and CE-MRI (enhanced T1), and the other 52 were delineated based on CE-MRI as control. Results. The median survival benefit was 6 months. The 2-year overall survival, progression-free survival, and local–regional control rates were 48% vs. 25%, 42% vs. 13.46%, and 40% vs. 13.46% for the multimodality MRI and CE-MRI cohorts, respectively. The two cohorts had similar rates of disease progression and recurrence but different proportions of failure patterns. The univariate analysis shows that characteristics of patients such as combined with epilepsy, the dose of radiotherapy, the selection of MRI were significant influence factors for 2-year overall survival. However, in multivariate analyses, only the selection of MRI was an independent significant predictor of overall survival. Conclusions. This study was the first to explore the clinical value of multimodality MRI in the delineation of radiotherapy target volume for HGG. The conclusions of the study have positive reference significance to the combination of multimodality MRI and CE-MRI in guiding the delineation of the radiotherapy target area for HGG patients.

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