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3,036 results for “ct”
Micro X-ray CT time-series (4D dataset)
<p>The CGLS reconstruction from a time-series with 21 tomograms each collected with 91 projections. For the reconstruction the Savu Python package was used (https://doi.org/10.5281/zenodo.32840). We acknowledge Diamond Light Source for the time on I13-2 under proposal mt9396.</p>
CT and 3D Data from: A large Middle Devonian eubrachythoracid 'placoderm' (Arthrodira) jaw from northern Gondwana
<p><em>Leptodontichthys ziregensis</em> is a newly described eubrachythoracid arthrodire from the Middle Devonian of Morocco. Only the posterior superognathal is preserved, it possesses features which were, so far, seen in Late Devonian forms. The jaw bone presents two sets of teeth, one lateral and one posterior, with dentinous tissue, pulp cavities and vascular canals preserved. The CT scans provided here are the ones used for the study. The complete jaw data was used for the overall study and the closeup data was used for the segmentation of the teeth. The ply data is provided to provide the information extracted by the authors during the study.</p>
Experimental Data for "Seismic wave attenuation and dispersion due to partial fluid saturation: Direct measurements and numerical simulations based on X-Ray CT"
<p>Experimental Data from a Berea sandstone sample. Includes X-ray CT scans and mechanical response of sample.</p> <p>Abstract</p> <p>Quantitatively assessing seismic attenuation caused by fluid pressure diffusion (FPD) in partially saturated rocks is challenging because of its sensitivity to the spatial fluid distribution. To address this challenge we performed depressurisation experiments to induce the exsolution of carbon dioxide from water in a Berea sandstone sample. In a first set of experiments we used medical X-ray computed tomography (CT) to characterise the fluid distribution. At an equilibrium pressure of ~1 MPa and applying a fluid pressure decline rate of ~0.6 MPa per minute, we allowed a change in saturation of less than 1 %. The gas was heterogeneously distributed along the length of the sample, with most of the gas exsolving near the sample outlet. In a second set of experiments, at the same pressure and temperature, following a very similar exsolution protocol, we measured the frequency dependent attenuation and modulus dispersion between 0.1 and 1000 Hz using the forced oscillation method. We observed significant attenuation and dispersion in the extensional and bulk deformation modes, however not in the shear mode. Lastly, we use the fluid distribution derived from the X-ray CT as an input for numerical simulations of FPD to compute the attenuation and modulus dispersion. The numerical solutions are in close agreement with the attenuation and modulus dispersion measured in the laboratory. Our methodology allows for accurately relating attenuation and dispersion to the fluid distribution, which can be applied to improving the seismic monitoring of the subsurface.</p>
Prediction of femoral osteoporosis using machine-learning analysis with radiomics features and abdomen-pelvic CT: A retrospective single center preliminary study
<p>Dataset of prediction of osteoporosis using APCT, radiomics and machine learning analysis.</p>
Data from: Systematics of the ant genus Proceratium Roger (Hymenoptera, Formicidae, Proceratiinae) in China – with descriptions of three new species based on micro-CT enhanced next-generation-morphology
The genus Proceratium Roger, 1863 contains cryptic, subterranean ants that are seldom sampled and rare in natural history collections. Furthermore, most Proceratium specimens are extremely hairy and, due to their enlarged and curved gaster, often mounted suboptimally. As a consequence, the poorly observable physical characteristics of the material and its scarcity result in a rather challenging alpha taxonomy of this group. In this study, the taxonomy of the Chinese Proceratium fauna is reviewed and updated by combining examinations of traditional light microscopy with x-ray microtomography (micro-CT). Based on micro-CT scans of seven out of eight species, virtual 3D surface models were generated that permit in-depth comparative analyses of specimen morphology in order to overcome the difficulties to examine physical material of Proceratium. Eight Chinese species are recognized, of which three are newly described: Proceratium bruelheidei Staab, Xu & Hita Garcia, sp. n. and P. kepingmai sp. n. belong to the P. itoi clade and have been collected in the subtropical forests of southeast China, whereas P. shohei sp. n. belongs to the P. stictum clade and it is only known from a tropical forest of Yunnan Province. Proceratium nujiangense Xu, 2006 syn. n. is proposed as a junior synonym of P. zhaoi Xu, 2000. These taxonomic acts raise the number of known Chinese Proceratium species to eight. In order to integrate the new species into the existing taxonomic system and to facilitate identifications, an illustrated key to the worker caste of all Chinese species is provided, supplemented by species accounts with high-resolution montage images and still images of volume renderings of 3D models based on micro-CT. Moreover, cybertype datasets are provided for the new species, as well as digital datasets for the remaining species that include the raw micro-CT scan data, 3D surface models, 3D rotation videos, and all light photography and micro-CT still images. These datasets are available online (Dryad, Staab et al. 2018, http://dx.doi.org/10.5061/dryad.h6j0g4p).
Shell Gorget (2020a8854) (CT scan)
**Shell gorget** Location: Coweeta Creek site (31Ma34), Macon County, North Carolina. Period: Mississippian, Qualla phase (AD 1400-1700). Material: marine shell. Dimensions: length, 163.0 mm; width, 131.0 mm; thickness, 32.0 mm. Notes: Catalog no. 2020a8854. This artifact model was created by Abigail Gancz and is derived from a computerized tomography (CT) scan of the object performed at UNC Hospitals in 2014. The model's texture is derived from digital photographs of the object taken in 1994 and only approximates the object's actual texture. Source: Objaverse 1.0 / Sketchfab
Shell Pin (2020a8862) (CT scan)
**Shell pin** Location: Coweeta Creek site (31Ma34), Macon County, North Carolina. Period: Mississippian, Qualla phase (AD 1400-1700). Material: marine shell. Dimensions: length, 130.8 mm; width, 26.8 mm; thickness, 20.8 mm. Notes: Catalog no. 2020a8762, specimen 1. This artifact model was created by Abigail Gancz and is derived from a computerized tomography (CT) scan of the object performed at UNC Hospitals in 2014. The model's texture is derived from digital photographs of the object taken in 1994 and only approximates the object's actual texture. Source: Objaverse 1.0 / Sketchfab
CT images reconstructed using level-set-reconstruction (published in PTRSA)
<p>A new CT reconstruction algorithm based on the level-set-method has been proposed and evaluated. The results are published in Philosophical Transactions of the Royal Society A. The data set includes all examples described in the paper.</p>
DATA of Effect of different iterative reconstruction algorithms on ultra-low dose CT of inflammatory bowel disease in a rabbit model
<p>This file contains the experimental data of the scientific paper titled: " <strong>Effect of different iterative reconstruction algorithms on ultra-low dose CT of inflammatory bowel disease in a rabbit model"</strong></p>
FIGURE 6 in Comparative morphology of rostral cartilages in extant mackerel sharks (Chondrichthyes, Lamniformes, Lamnidae) using CT scanning
FIGURE 6. Lamna ditropis Hubbs & Follett, 1947, female, 2340 mm, TL, northeast Pacific Ocean (ERB 0854), 3D reconstructions based on CT scans of the entire head, showing all cartilaginous structures: lateral (A) (image reversed), dorsal (B), ventral (C), anterior (D) and anterolateral (E) views. Abbreviations: see Fig. 2.
FIGURE 5 in Comparative morphology of rostral cartilages in extant mackerel sharks (Chondrichthyes, Lamniformes, Lamnidae) using CT scanning
FIGURE 5. Lamna nasus (Bonnaterre, 1788), male, 1740 mm TL, northeast Atlantic Ocean (ERB 0929), 3D reconstructions based on CT scans of the entire head, showing all cartilaginous structures: lateral (A), dorsal (B), ventral (C), anterior (D) and anterolateral (E) views. Abbreviations: see Fig. 2.
FIGURE 4. Isurus paucus Guitart Manday, 1966 in Comparative morphology of rostral cartilages in extant mackerel sharks (Chondrichthyes, Lamniformes, Lamnidae) using CT scanning
FIGURE 4. Isurus paucus Guitart Manday, 1966, female, 2540 mm TL, northwest Atlantic Ocean (ERB 0935), 3D reconstructions based on CT scans of the entire head, showing all cartilaginous structures: lateral (A), dorsal (B), ventral (C), anterior (D) and anterolateral (E) views. Abbreviations: see Fig. 2.
FIGURE 3. Isurus oxyrinchus Rafinesque, 1810 in Comparative morphology of rostral cartilages in extant mackerel sharks (Chondrichthyes, Lamniformes, Lamnidae) using CT scanning
FIGURE 3. Isurus oxyrinchus Rafinesque, 1810, female, 1940 mm TL, northeast Atlantic Ocean (ERB 0933), 3D reconstructions based on CT scans of the entire head, showing all cartilaginous structures: lateral (A), dorsal (B), ventral (C), anterior (D) and anterolateral (E) views. Abbreviations: see Fig. 2.
FIGURE 2 in Comparative morphology of rostral cartilages in extant mackerel sharks (Chondrichthyes, Lamniformes, Lamnidae) using CT scanning
FIGURE 2. Carcharodon carcharias (Linnaeus, 1758), female, 2120 mm TL, southwest Indian Ocean (ERB 0932), 3D reconstructions based on CT scans of the entire head, showing all cartilaginous structures: lateral (A), dorsal (B), ventral (C), anterior (D) and anterolateral (E) views. Abbreviations: AF, anterior fontanelle; IP, internasal plate; LR, lateral rostral cartilages; MR, medial rostral cartilage; NA, nasal aperture; NC, nasal capsule; PR, preorbital process; RN, rostral node; ROS, rostral space.
FIGURE 12 in Taxonomy and nomenclature of some mainland SE-Asian Coeliccia species (Odonata, Platycnemididae) using micro-CT analysis
FIGURE 12. Virtual sections and volume rendering with micro-CT reconstruction of the genital ligula of Coeliccia scutellum (orientation bars: d dorsal, l lateral, p posterior, v ventral). A Virtual dorsal section from original image stack with genital ligula labeled in green, B Virtual sagittal section from original image stack with genital ligula labeled in green, C Transparent volume rendering of cuticle shows positioning of genital ligula within abdominal segment 2, ventral view, D Transparent volume rendering of cuticle shows positioning of genital ligula within abdominal segment 2, lateral view. Scale bars: 500Μm.
FIGURE 11 in Taxonomy and nomenclature of some mainland SE-Asian Coeliccia species (Odonata, Platycnemididae) using micro-CT analysis
FIGURE 11. Photos in life of Coeliccia pyriformis and Coeliccia cyanomelas. A Coeliccia pyriformis, male, Tam Đảo, northern Vietnam. B Coeliccia pyriformis, tandem, Tam Đảo, northern Vietnam. C Coeliccia pyriformis, male thorax and head dorsal, Tam Đảo, northern Vietnam. D Coeliccia cyanomelas, male head and thorax dorsolateral, Tam Đảo, northern Vietnam. E Coeliccia cyanomelas, male with four dorsal synthorax markings, Tam Đảo, northern Vietnam. F Coeliccia cyanomelas, male with two dorsal synthorax markings, Tam Đảo, northern Vietnam. All photos by Sebastién Delonglee.
FIGURE 10 in Taxonomy and nomenclature of some mainland SE-Asian Coeliccia species (Odonata, Platycnemididae) using micro-CT analysis
FIGURE 10. Coeliccia cyanomelas Tam Đảo, Vietnam. A head dorsal, B thorax dorsal, C thorax dorsolateral, D anal appendages dorsal, E anal appendages lateral, F anal appendages dorsolateral. Scale bars: 500Μm.
FIGURE 9. Coeliccia cyanomelas Taihanroku, Taiwan. A head dorsolateral, B in Taxonomy and nomenclature of some mainland SE-Asian Coeliccia species (Odonata, Platycnemididae) using micro-CT analysis
FIGURE 9. Coeliccia cyanomelas Taihanroku, Taiwan. A head dorsolateral, B prothorax and thorax dorsolateral, C prothorax and thorax dorsal, D anal appendages dorsal, E anal appendages lateral, F anal appendages dorsolateral, G left Fw, H left Hw. Scale bars: 500Μm.
FIGURE 8 in Taxonomy and nomenclature of some mainland SE-Asian Coeliccia species (Odonata, Platycnemididae) using micro-CT analysis
FIGURE 8. Genital ligulae as reconstructed from micro-CT (orientation bars: dl dorsolateral, l lateral, p posterior, v ventral, vl ventrolateral). A–B Genital ligula of C. pyriformis holotype, B–C genital ligula of C. cyanomelas.
FIGURE 7. Coeliccia pyriformis Holotype. A head dorsolateral, B in Taxonomy and nomenclature of some mainland SE-Asian Coeliccia species (Odonata, Platycnemididae) using micro-CT analysis
FIGURE 7. Coeliccia pyriformis Holotype. A head dorsolateral, B prothorax and thorax dorsolateral, C prothorax and thorax dorsal, D anal appendages dorsolateral, E anal appendages lateral, F anal appendages dorsal, G left Fw, H left Hw. Scale bars: 500Μm.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.