Browsing by Subject "Computed tomography"

Now showing 1 - 5 of 5
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    Computed tomography and magnetic resonance imaging study of a normal tarsal joint in a Bengal tiger (Panthera tigris)
    (BioMed Central, 2019-04-29) Arencibia, Alberto; Matos, Jorge; Encinoso, Mario; Gil Cano, Francisco; Artiles, Alejandro; Martínez Gomariz, Francisco; Vázquez Autón, José María; Anatomía y Anatomía Patológica Comparada; Facultad de Veterinaria
    Background. In this research, using computed tomography (CT) and magnetic resonance imaging (MRI), we provide a thorough description of the standard appearance of a right tarsal joint in a Bengal tiger (Panthera tigris). CT scans were performed using a bone and soft tissue window setting, and three-dimensional surface reconstructed CT images were obtained. The MRI protocol was based on the use of Spin-echo (SE) T1-weighted and Gradient-echo (GE) STIR T2-weighted pulse sequences. Magnetic resonance (MR) images were taken in the transverse, sagittal and dorsal planes. We also performed anatomical dissections to facilitate the interpretation of the different structures of the tarsus joint and allow comparisons with CT and MRI images. Results: The CT images allowed us to observe differences between the bones and soft tissues of the tarsal joint. When applying the bone window setting, the obtained footage showed the anatomy between the medulla and cortex. Additionally, the trabecular bone was delineated. By contrast, the soft tissue window allowed the main soft tissue structures of the tarsal joint, including ligaments, muscles and tendons, to be differentiated. Footage of the main anatomical structures of the standard tiger tarsus was obtained through MRI. The SE T1-weighted images showed the best evaluation of the cortical, subchondral and trabecular bone of the tibia, fibula, tarsus and metatarsus bones. Nonetheless, the GE STIR T2-weighted images allowed us to better visualize the articular cartilage and synovial fluid. In both MRI pulse sequences, the ligaments and tendons appeared with low signal intensity compared with muscles that were visible with intermediate signal intensity. Conclusions: The results of this CT and MRI study of the Bengal tiger tarsal joint provide some valuable anatomical information and may be useful for diagnosing disorders in this large non-domestic cat.
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    Imaging the lung: the old ways and the new
    (Universidad de Murcia. Departamento de Biología Celular e Histología, 2017) Poobalasingam, Thanushiyan; Salman, David; Li, Henry; Alçada, Joana; Dean, Charlotte H.
    Our understanding of lung biology can be greatly enhanced by studying embryonic and postnatal lung development, and the perturbations which occur during disease. Imaging techniques provide a unique insight into these processes. A wide variety of imaging techniques have been used to study the lungs at various stages of development and disease, ranging from histological stains to more novel techniques such as single plane illumination microscopy (SPIM), intravital microscopy (IVM), and micro-computed tomography (micro-CT). Each of these tools can be used to elicit different information about the lungs and each has its own unique advantages and disadvantages for pulmonary research. In this review we assess some of the most commonly-used and novel imaging techniques available for lung research today.
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    The bony nasal cavity and paranasal sinuses of big felids and domestic cat: a study using anatomical techniques, computed tomographic images reconstructed in maximum-intensity projection, volume rendering and 3D printing models
    (MDPI, 2024-09-07) Díaz Martínez, Elena; Arencibia Espinosa, Alberto; Soler Laguía, Marta; Ayala Florenciano, María Dolores; Kilroy, David; García García, María I.; Martínez Gomariz, Francisco; Sánchez Collado, Cayetano; Gil Cano, Francisco; Raduán Jaber, José; Ramírez Zarzosa, Gregorio José; Anatomía y Anatomía Patológica Comparada; Facultad de Veterinaria
    This study aims to develop three-dimensional printing models of the bony nasal cavity and paranasal sinuses of big and domestic cats using reconstructed computed tomographic images. This work included an exhaustive study of the osseous nasal anatomy of the domestic cat carried out through dissections, bone trepanations and sectional anatomy. With the use of OsiriX viewer, the DICOM images were postprocessed to obtaining maximum-intensity projection and volume-rendering reconstructions, which allowed for the visualization of the nasal cavity structures and the paranasal sinuses, providing an improvement in the future anatomical studies and diagnosis of pathologies. DICOM images were also processed with AMIRA software to obtain three-dimensional images using semiautomatic segmentation application. These images were then exported using 3D Slicer software for three-dimensional printing. Molds were printed with the Stratasys 3D printer. In human medicine, three-dimensional printing is already of great importance in the clinical field; however, it has not yet been implemented in veterinary medicine and is a technique that will, in the future, in addition to facilitating the anatomical study and diagnosis of diseases, allow for the development of implants that will improve the treatment of pathologies and the survival of big felids.
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    Unexpected intracranial location of a Cephenemyia stimulator larva in a roe deer, Capreolus capreolus, revealed by computed tomography
    (Sociedad Española para la Conservación y Estudio de los Mamíferos - SECEM, 2021-02-14) Fidalgo Álvarez, Luis Eusebio; López-Beceiro, Ana M.; Martínez-Carrasco Pleite, Carlos; Caparrós-Fontarosa, Noelia; Sánchez Baca, Antonio; Vila, Mónica; Barreiro, Daniel; Sarasa, Mathieu; Pérez-Jiménez, Jesús M.; Sanidad Animal; Facultad de Veterinaria
    In this study we describe the finding of a Cephenemyia stimulator larva in the brain of a roe deer (Capreolus capreolus) after performing a computed tomography (CT) scan of its head. Despite this anatomical location of oestrid larvae could be relatively frequent in other genera, such as Oestrus, to our knowledge, this is the first reported case involving the genus Cephenemyia. Concretely, a second-instar C. stimulator larva was found in the basis of the cranium. The location of a macroscopic hemorrhagic lesion involving the brain parenchyma peripheral to the location of the larva suggests that tissue colonization occurred before the animal was hunted. Since no detectable alterations or damage to the cranial bones were observed, we suggest a possible larval migration route drilling the skull bones. Finally, we propose the use of the term “neuromyiasis” to be referred to the invasion of the central nervous system by dipteran larvae, particularly oestrids.
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    Use of Computed Tomography as a non-invasive method for diagnosing cephenemyiosis in roe deer (Capreolus capreolus)
    (Wiley, 2014-10-08) Fidalgo, Luis E.; López Beceiro, Ana M.; Vila Pastor, M.; Martínez-Carrasco Pleite, Carlos; Barreiro Vázquez, J. D.; Pérez Jiménez, Jesús M.; Sanidad Animal; Facultades de la UMU::Facultad de Veterinaria
    This study was conducted to assess the reliability of computed tomography (CT) for diagnosing bot fly infestations by Cephenemyia stimulator (Clark) (Diptera: Oestridae) in roe deer (Capreolus capreolus L.) (Artiodactyla: Cervidae). For this purpose, the heads of 30 animals were analysed, firstly by CT and then by necropsy, which was used as the reference standard method. The prevalence values obtained by both methods were identical; the prevalence of infestation was 40.0% overall, and was higher in males (45.5%) than in females (25.0%). These results highlight the usefulness of CT as an alternative or non-invasive method for diagnosing cephenemyiosis in live-captured roe deer and in hunting trophies or museum collections that cannot be destroyed or damaged.