scholarly journals Volumetric analysis of the cranial and nasal cavity from micro-computed tomography scans in the rabbit

2020 ◽  
Vol 79 (2) ◽  
pp. 333-338
Author(s):  
C. Bakıcı ◽  
R. O. Akgun ◽  
O. Ekım ◽  
C. Soydal ◽  
C. Oto
Keyword(s):  
Computed Tomography ◽  
Nasal Cavity ◽  
Volumetric Analysis ◽  
Micro Computed Tomography ◽  
Computed Tomography Scans

scholarly journals A redescription of the Late Jurassic (Tithonian) turtle Uluops uluops and a new phylogenetic hypothesis of Paracryptodira

2021 ◽  
Vol 140 (1) ◽  
Author(s):  
Yann Rollot ◽  
Serjoscha W. Evers ◽  
Walter G. Joyce
Keyword(s):  
Computed Tomography ◽  
Phylogenetic Analysis ◽  
Late Jurassic ◽  
Internal Carotid ◽  
Circulation System ◽  
Phylogenetic Hypothesis ◽  
Micro Computed Tomography ◽  
Future Studies ◽  
Computed Tomography Scans ◽  
Palatine Artery

AbstractWe study the Late Jurassic (Tithonian) turtle Uluops uluops using micro-computed tomography scans to investigate the cranial anatomy of paracryptodires, and provide new insights into the evolution of the internal carotid artery and facial nerve systems, as well as the phylogenetic relationships of this group. We demonstrate the presence of a canalis caroticus lateralis in Uluops uluops, the only pleurosternid for which a palatine artery canal can be confidently identified. Our phylogenetic analysis retrieves Uluops uluops as the earliest branching pleurosternid, Helochelydridae within Pleurosternidae, and Compsemydidae including Kallokibotion bajazidi within Baenidae, which suggests at least two independent losses of the palatine artery within paracryptodires. We expect future studies will provide additional insights into the evolution of the circulation system of paracryptodires, as well as clarifying relationships along the turtle stem.

scholarly journals Quantitative volumetric analysis of cardiac morphogenesis assessed through micro-computed tomography

2007 ◽  
Vol 236 (3) ◽  
pp. spc1-spc1
Author(s):  
Jonathan T. Butcher ◽  
David Sedmera ◽  
Robert E. Guldberg ◽  
Roger R. Markwald
Keyword(s):  
Computed Tomography ◽  
Volumetric Analysis ◽  
Micro Computed Tomography ◽  
Cardiac Morphogenesis

scholarly journals Porosity Distribution in Apically Perforated Curved Root Canals Filled with Two Different Calcium Silicate Based Materials and Techniques: A Micro-Computed Tomography Study

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1729 ◽  
Author(s):  
Saulius Drukteinis ◽  
Vytaute Peciuliene ◽  
Hagay Shemesh ◽  
Paulius Tusas ◽  
Ruta Bendinskaite
Keyword(s):  
Computed Tomography ◽  
Volumetric Analysis ◽  
Apical Region ◽  
Micro Computed Tomography ◽  
Porosity Distribution ◽  
Isotropic Resolution ◽  
Root Canals ◽  
Mandibular Molars ◽  
Before And After ◽  
Application Techniques

The present study evaluated the porosity distribution of BioRoot RCS/single gutta-percha point (BR/SC) and MTA flow (MF) fillings, which were used as plugs for the apical perforation repair in curved canals of extracted mandibular molars using micro-computed tomography (μCT). Forty mesial root canals of mandibular first molars were shaped with ProTaper NEXT X1–X5 files 2 mm beyond the apex to simulate apical perforations that were randomly divided into two groups (n = 20) according to the material and technique used for the apical plug: BR/SC or MF. The specimens were scanned before and after canal filling at an isotropic resolution of 9.9 μm. The volumetric analysis of voids in the apical 5 mm of the fillings was performed. Data were analyzed using one-way ANOVA with Bonferroni correction (p < 0.05). Micro-computed tomography (µCT) evaluation revealed significant differences between the groups in terms of porosity: the total volume and percentage volume of voids was lower in the BR/SC group in comparison with the MF group (p < 0.05), with the predominance of open pores in both groups. Neither of the materials and/or application techniques were able to produce void-free root fillings in the apical region of artificially perforated curved roots of mandibular molars.

scholarly journals A dataset comprising four micro-computed tomography scans of freshly fixed and museum earthworm specimens

GigaScience ◽  
2014 ◽  
Vol 3 (1) ◽  
Author(s):  
Jennifer Lenihan ◽  
Sebastian Kvist ◽  
Rosa Fernández ◽  
Gonzalo Giribet ◽  
Alexander Ziegler
Keyword(s):  
Computed Tomography ◽  
Micro Computed Tomography ◽  
Computed Tomography Scans

scholarly journals The five digits of the giraffe metatarsal

2020 ◽  
Vol 131 (3) ◽  
pp. 699-705
Author(s):  
Laurel R Yohe ◽  
Nikos Solounias
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Fossil Record ◽  
The Other ◽  
Micro Computed Tomography ◽  
Common Assumption ◽  
Internal Morphology ◽  
Computed Tomography Scans ◽  
The Common ◽  
Taxonomic Groups

Abstract Evolution has shaped the limbs of hoofed animals in specific ways. In artiodactyls, it is the common assumption that the metatarsal is composed of the fusion of digits III and IV, whereas the other three digits have been lost or are highly reduced. However, evidence from the fossil record and internal morphology of the metatarsal challenges these assumptions. Furthermore, only a few taxonomic groups have been analysed. In giraffes, we discovered that all five digits are present in the adult metatarsal and are highly fused and modified rather than lost. We examined high-resolution micro-computed tomography scans of the metatarsals of two mid and late Miocene giraffid fossils and the extant giraffe and okapi. In all the Giraffidae analysed, we found a combination of four morphologies: (1) four articular facets; (2) four or, in most cases, five separate medullary cavities internally; (3) a clear, small digit I; and (4) in the two fossil taxa of unknown genus, the presence of external elongated grooves where the fusions of digits II and V have taken place. Giraffa and Okapia, the extant Giraffidae, show a difference from all the extinct taxa in having more flattened digits tightly packed together, suggesting convergent highly fused digits despite divergent ecologies and locomotion. These discoveries provide evidence that enhances our understanding of how bones fuse and call into question current hypotheses of digit loss.

Influence of foraminal enlargement on the apical extrusion of filling material: Volumetric analysis using micro‐computed tomography

2020 ◽  
Vol 46 (2) ◽  
pp. 210-216
Author(s):  
Patrícia Pereira Albuquerque ◽  
Marco Antonio Hungaro Duarte ◽  
Rina Andréa Pelegrine ◽  
Augusto Shoji Kato ◽  
Carolina Pessoa Stringheta ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Volumetric Analysis ◽  
Filling Material ◽  
Micro Computed Tomography ◽  
Apical Extrusion

scholarly journals “Mucosal maps” of the canine nasal cavity: Micro‐computed tomography and histology

2020 ◽  
Vol 304 (1) ◽  
pp. 127-138
Author(s):  
Timothy D. Smith ◽  
Brent A. Craven ◽  
Serena M. Engel ◽  
Blaire Van Valkenburgh ◽  
Valerie B. DeLeon
Keyword(s):  
Computed Tomography ◽  
Nasal Cavity ◽  
Micro Computed Tomography
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