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243 results for “X-ray tomography”
FIGURES 9–11. X in The first extinct species of Monolepta Chevrolat (Coleoptera: Chrysomelidae Galerucinae) from Bitterfeld amber, described using X-ray micro-computed tomography
FIGURES 9–11. X-ray micro-CT renderings of Monolepta rappsilberi sp. nov., holotype, No T-I-K-30 [CIR]: 9—habitus, caudal view; 10—details of forebody, dorsal view; 11—habitus without legs, ventral view. Not reproduced to the same scale.
The efficacy of X-ray micro-computed tomography for acorn worm taxonomy: Balanoglossus occidentalis (manuscript species) from Puget Sound, Washington
<p>Micro-CT scan data of Balanoglossus occidentalis generated with a Zeiss Xradia Versa 520. A first scan was made of the whole specimen with AMC drift correction, 0 beam hardening, voltage of 60 kV, currant of 82 µA, exposure time of 1.7 sec, LE2 source filter, LE6 secondary filter, 1601 Projection numbers, single FOV, vertical stitching and a resolution of 9,0373 µm. Then, a second scan was made focusing on the collar and the base of the proboscis because these regions are particularly informative to taxonomic descriptions of acorn worms. This second scan had a Projection number of 2401 and a resolution of 4.5075 µm. Each scan took 3 hours.</p>
Figure 3 in Trigonotarbus johnsoni Pocock, 1911, revealed by X-ray computed tomography, with a cladistic analysis of the extinct trigonotarbid arachnids
Figure 3. Tomographic reconstruction of Trigonotarbus johnsoni based on specimen NHMUK I. 15860. A, dorsal view. B, fourth right leg, podomeres labelled. C, ventral view. D, ventrolateral view of the coxo-sternal region. Abbreviations: 1–12, segment number; CE1−2, coxal endites 1–2; CH, chelicerae; CL, clypeus; FE, femur; L1−L4, legs 1–4; ME, median eye tubercle; MT, metatarsus; PA, patella; PP, pedipalp; PR, projection; TA, tarsus; TI, tibia; TR, trochanter. Scale bars: A, C = 2 mm, B = 1 mm, D = 0.5 mm.
Figure 1 in Trigonotarbus johnsoni Pocock, 1911, revealed by X-ray computed tomography, with a cladistic analysis of the extinct trigonotarbid arachnids
Figure 1. Reconstructions of representatives of nine trigonotarbid families, shown to scale. A, Palaeocharinus rhyniensis (Palaeocharinidae). B, Archaeomartus levis (Archaeomartidae). C, Anthracomartus hindi (Anthracomartidae). D, Anthracosiro woodwardi (Anthracosironidae). E, Trigonotarbus johnsoni (Trigonotarbidae). F, Lissomartus schucherti (Lissomartidae). G, Aphantomartus pustulatus (Aphantomartidae). H, Eophrynus prestvicii (Eophrynidae). I, Kreischeria wiedei (Kreischeriidae). Scale bar = 10 mm.
Figure 5 in Trigonotarbus johnsoni Pocock, 1911, revealed by X-ray computed tomography, with a cladistic analysis of the extinct trigonotarbid arachnids
Figure 5. The results of the cladistic analysis. The four trees show, as labelled, the agreement subtree and strict consensus of both the equally weighted analysis and implied weights analyses with concavity constants (k) of 0.25, 1, 3, and 10.
Figure 4 in Trigonotarbus johnsoni Pocock, 1911, revealed by X-ray computed tomography, with a cladistic analysis of the extinct trigonotarbid arachnids
Figure 4. An idealized reconstruction of Trigonotarbus johnsoni based on the computed tomography scan of NHMUK I. 15860 and additional hand specimens. Scale bar = 2 mm.
FIGURE 1 in First fossil representative of Cerylonidae (Coleoptera: Coccinelloidea) described using X-ray micro-computed tomography, from Eocene Baltic amber
FIGURE 1. Protostomopsis pandema gen. et sp. nov., holotype, No MP/4233/col. AG/no. 9441 [ISEA]: A, B – dorsal habitus photomicrograph, and corresponding X-ray μCT rendering; C, D – ventral habitus photomicrograph, and corresponding X-ray μCT rendering. Scale bars represent 0.25 mm.
FIGURE 7 in First fossil representative of Cerylonidae (Coleoptera: Coccinelloidea) described using X-ray micro-computed tomography, from Eocene Baltic amber
FIGURE 7. Distribution of Ostomopsinae: extant species of Ostomopsis (green), and Eocene record of fossil Protostomopsis pandema gen. et sp. nov. (red).
FIGURE 6 in First fossil representative of Cerylonidae (Coleoptera: Coccinelloidea) described using X-ray micro-computed tomography, from Eocene Baltic amber
FIGURE 6. Protostomopsis pandema gen. et sp. nov., MP/4233/col. AG/no.9441 [ISEA], X-ray μCT rendering of aedeagus: A – dorsal view; B – ventral view; C – lateral view. Abbreviations: ap—apex; ba—base. Scale bar represents 0.1 mm.
FIGURE 3 in First fossil representative of Cerylonidae (Coleoptera: Coccinelloidea) described using X-ray micro-computed tomography, from Eocene Baltic amber
FIGURE 3. Protostomopsis pandema gen. et sp. nov., paratype, No P3300.138 [RSKM], habitus: A – dorsal view; B – ventral view; C – right lateral view. Scale bar represents 0.5 mm.
FIGURE 2 in First fossil representative of Cerylonidae (Coleoptera: Coccinelloidea) described using X-ray micro-computed tomography, from Eocene Baltic amber
FIGURE 2. Protostomopsis pandema gen. et sp. nov., holotype, No MP/4233/col. AG/no. 9441 [ISEA] surrounded by fungal hyphae: A, B – right lateral habitus photomicrograph, and corresponding X-ray μCT rendering; C, D – left lateral habitus phot- omicrograph, and corresponding X-ray μCT rendering. Scale bars represent 0.25 mm.
FIGURE 4 in First fossil representative of Cerylonidae (Coleoptera: Coccinelloidea) described using X-ray micro-computed tomography, from Eocene Baltic amber
FIGURE 4. Protostomopsis pandema gen. et sp. nov., paratype, No P3300.138 [RSKM]: A – habitus, ventrolateral view; B – details of abdomen showing apical margin of ventrite 5. Scale bars represent 0.5 mm for Fig. A, 0.1 mm for Fig. B.
High-resolution X-ray computed tomography images of Bentheim sandstone under elevated stress
<p>A dry sample of Bentheim (or Bentheimer) sandstone was characterized using 3D X-Ray microscopy (Versa XRM-500, XRadia-Zeiss) at three different confining pressures of 1 MPa, 20 MPa, and 30 MPa and two voxel sizes of (1.5854 µm)<sup>3</sup> and (3.3452 µm)<sup>3</sup>. The 5-mm-diameter, 20-mm-long dry sample was placed inside a custom-made pressure sell (Lebedev et al, 2017). The sample was subjected to confining pressure of 20 MPa and 3200 radiographs were acquired, then confining pressure was reduced to 1MPa and the sample was imaged again, finally, the sample was pressurized up to 30MPa and the final image set was taken. Image reconstruction was done using internal software (XRadia-Zeiss).</p>
Cone-beam Gel phantom data for dynamic X-ray tomography
<p>The gel phantom was constructed to simulate the flow of iodine-based contrast agents in plant stems, whilst being more tolerant to the high radiation dose of X-ray tomography scanning. A thorough explanation of the phantom, its motivation and the measurement setup can be found in <a href="https://arxiv.org/abs/2003.02841">arXiv:2003.02841</a>. Attached is a brief documentation which focuses primarily on the higher dimensional 3D files and the key differences between the two data sets.</p> <p>The primary measurements consist of 17 consecutive time frames, with an initial state of no contrast agent followed by a steady increase thereof, primarily via downward diffusion into the gel body over time. Each time frame consists of 360 projections acquired with a cone-beam micro-CT scanner, resulting in a sequence of 3D cone-beam sinograms. Moreover, the first time frame is provided with higher angular sampling of 720 projections, and an additional 18th time frame with 1600 projections.</p> <p>The data set contains the following MATLAB files:</p> <ul> <li><strong>3dGelPhantomData_b4.mat</strong></li> <li><strong>3dGelPhantomData_b8.mat</strong></li> <li><strong>3dGelPhantomData_b16.mat</strong></li> <li><strong>3dGelPhantomExtraFrames_b4.mat</strong></li> <li><strong>3dGelPhantomExtraFrames_b8.mat</strong></li> <li><strong>3dGelPhantomExtraFrames_b16.mat</strong></li> </ul> <p>And a more detailed documentation: <strong>ConeBeamGelPhantomDocumentation.pdf </strong>(v1.0)</p> <p>The proper use of these files requires the <a href="https://www.astra-toolbox.com/">ASTRA Toolbox</a>, <a href="https://www.cs.ubc.ca/labs/scl/spot/">the Spot Linear-Operator Toolbox</a>, and <a href="https://www.mathworks.com/matlabcentral/fileexchange/74417-heltomo-university-of-helsinki-ct-data-toolbox">the HelTomo Toolbox</a>. In addition the operators and reconstruction algorithms provided by ASTRA for 3D geometry <strong>require CUDA capable graphics card </strong>(GPU) due to large amounts of (parallel) computations. The older <a href="https://doi.org/10.5281/zenodo.3696816">2D data set</a> provides a computationally lighter and more user-friendly starting point for inexperienced users.</p>
X-ray Fluoroscopy Fused With Computed Tomography (XFC) Technical Development
ClinicalTrials.gov study NCT00965679. IPD Sharing: Not stated. Countries: 1. Publications: 3.
Data from: X-Ray computed tomography of two mammoth calf mummies
Open the record for dataset details and reuse information.
Data from: X-ray computed tomography and its potential in ecological research: a review of studies and optimization of specimen preparation
Open the record for dataset details and reuse information.
Figure 6 from: Silva MS, Carbayo F (2020) X-ray microcomputed tomography applied to the taxonomic study of rare material: redescriptions of seven of Schirch's Brazilian species of land planarians (Geoplanidae, Platyhelminthes). ZooKeys 910: 1-42. https://doi.org/10.3897/zookeys.910.39486
Figure 6 Paraba bresslaui (Schirch 1929), µCT-derived images of cephalic extremity of holotype A, B perspective view of 3D rendering C virtual transverse section showing anteriormost eyes, pixel size: 1.9 µm D virtual transverse section showing eye and sensory pit, pixel size: 1.9 µm E horizontal virtual section showing rows of sensory pits, pixel size: 1.9 µm.
Figure 29 from: Silva MS, Carbayo F (2020) X-ray microcomputed tomography applied to the taxonomic study of rare material: redescriptions of seven of Schirch's Brazilian species of land planarians (Geoplanidae, Platyhelminthes). ZooKeys 910: 1-42. https://doi.org/10.3897/zookeys.910.39486
Figure 29 Pseudogeoplana wetzeli (Schirch 1929), syntype A. A Virtual section of pharynx, pixel size: 4.77 µm B photomicrograph of sagittal section of pharynx C photomicrograph of tangential section of outer epithelium of pharynx and its muscle, in sagittal plane D photomicrograph of sagittal section of outer epithelium of pharynx and its underlying muscle.
Figure 3 from: Silva MS, Carbayo F (2020) X-ray microcomputed tomography applied to the taxonomic study of rare material: redescriptions of seven of Schirch's Brazilian species of land planarians (Geoplanidae, Platyhelminthes). ZooKeys 910: 1-42. https://doi.org/10.3897/zookeys.910.39486
Figure 3 Obama itatiayana (Schirch 1929). Syntype C AµCT-derived image. Virtual sagittal section of pharynx and copulatory region, pixel size: 6.3 µm B photomicrograph of sagittal section of pharynx C photomicrograph of sagittal section of copulatory apparatus.
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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)
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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.