Search results for " CT"
showing 10 items of 306 documents
Contribución de la Educación Científica a la apropiación de los Objetivos de Desarrollo Sostenible
2013
Durante la Cumbre de la Tierra Rio+20, celebrada en junio de 2012, se puso en marcha un ambicioso proceso para definir unos Objetivos del Desarrollo Sostenible (ODS) capaces de orientar la necesaria y urgente transición a la sostenibilidad de nuestras sociedades. Para contribuir a dicho esfuerzo colectivo de definición de los ODS y mostrar cómo la comunidad educativa puede favorecer su apropiación por la ciudadanía, hemos utilizado una estrategia, inspirada en el método Delphi, consistente en un proceso iterativo en el que se han puesto en común y valorado las aportaciones de 60 investigadores e investigadoras en el campo de la didáctica de las ciencias. Los más de un centenar de objetivos …
Comparison of Iodine Quantification and Conventional Attenuation Measurements for Differentiating Small, Truly Enhancing Renal Masses From High-Atten…
2019
OBJECTIVE. The purpose of this study is to determine whether iodine quantification techniques from contrast-enhanced dual-energy CT (DECT) data allow equal differentiation of small enhancing renal masses from high-attenuation (> 20 HU of unenhanced attenuation) nonenhancing lesions, compared with conventional attenuation measurements. MATERIALS AND METHODS. A total of 220 nonconsecutive patients (mean [± SD] age, 66 ± 13 years; 130 men and 90 women) with 265 high-attenuation renal lesions (mean attenuation, 54 ± 33 HU; 91 enhancing lesions) were included. Each patient underwent single-energy unenhanced CT followed by DECT during the nephrographic phase using one of four different high-en…
Ganzkörper-Spiral-CT zur Primärdiagnostik polytraumatisierter Patienten unter Notfallbedingungen
1997
PURPOSE The aim of this study was to evaluate the role of a fast whole body helical CT scanner for primary diagnosis in trauma patients. METHODS 27 severely injured patients (9 women, 18 men; mean age 43 years) were first examined with a helical CT scanner allowing for digital radiograms up to a length of 1024 mm and continuous helical scans of up to 70 seconds (slice thickness 3 to 10 mm, pitch factor up to 2). The primary CT diagnosis was verified either by x-ray after the CT examination or during the subsequent days, by abdominal ultrasound, by additional CT scans in the following days, and by clinical follow-up. RESULTS CT showed all clinically relevant injuries of the head, spine, ches…
Root canal morphology and configuration of 123 maxillary second molars by means of micro-CT.
2017
The aim of this study was to investigate the root canal configuration, accessory canals and number of main foramina of 123 maxillary second molars by means of micro-computed tomography. The teeth were scanned and reproduced with 3D software imaging. The root canal configuration and number of main foramina were evaluated by means of a four-digit system. The morphological complexity of human maxillary second molars is depicted by the number of accessory and connecting canals. The most frequently observed root canal configurations in the mesiobuccal root were 2-2-2/2 (19.5%), 2-2-1/1 (14.6%) and 2-1-1/1 (13.0%). A 1-1-1/1 configuration was observed in 93.5% and in 96.7% in the distobuccal and …
Investigación en la escuela
2007
Resumen tomado de la publicación Se pretende dar respuesta al llamamiento que Naciones Unidas hace a los educadores de todas las áreas y niveles, para que contribuyan a formar una ciudadanía preparada para participar en la construcción de un futuro sostenible. Se presentan las estrategias diseñadas y aplicadas en las clases para potenciar el desarrollo sostenible propiciado por Naciones Unidas. Con ellas se intenta favorecer un planteamiento global de los problemas a los que se enfrenta hoy la humanidad. Se persigue romper con los tratamientos puntuales e inconexos, haciendo posible una correcta comprensión de la situación y la participación en la adopción de medidas adecuadas. Andalucía Ma…
Characterisation of two new radiochromic gel dosimeters TruView™ and ClearView™ in combination with the vista™ optical CT scanner: A feasibility study
2018
This study aims at characterising the properties of TruView™ and ClearView™ two new gel dosimeters (Modus Medical Devices Inc.) and at studying the feasibility of relative dosimetry using these dosimeters and the Vista™ Optical CT scanner to accurately evaluate dose.In this work, we investigated key dosimetric aspects (dose response, energy and dose rate dependence) and stability of these radiochromic gels initiated in preliminary works (Huet et al., 2017; Colnot et al., 2017) using spectrophotometric measurements. Moreover, by mean of optical CT scanning (Vista™), their performances to measure relative depth dose (PDD) and cross profiles were analysed.TruView™ and ClearView™ present a line…
Two cases of gynandromorphs in Orthoptera Tettigoniidae (Insecta).
2010
The author reports the gynandromorphs of two small species of Tettigoniidae, Leptophyes punctatissima (Bosc, 1792) collected in Corsica and Ctenodecticus siculus (Ramme, 1927) collected in Sicily, and describe their morphological and biometrical characteristics.
Automatic Volumetric Liver Segmentation Using Texture Based Region Growing
2010
In this paper an automatic texture based volumetric region growing method for liver segmentation is proposed. 3D seeded region growing is based on texture features with the automatic selection of the seed voxel inside the liver organ and the automatic threshold value computation for the region growing stop condition. Co-occurrence 3D texture features are extracted from CT abdominal volumes and the seeded region growing algorithm is based on statistics in the features space. Each CT volume is composed by 230 slices, having 512 x 512 pixels as spatial resolution, and 12-bit gray level resolution. In this initial feasible study, 5 healthy volunteer acquisitions has been used. Tests have been p…
impiego della PET CT nella valutazione delle metastasi epatiche da carcinoma del colon retto nei pazienti con Kras wild type e Kras mutate.
La tesi si incentra sul terzo tumore al mondo per diffusione nei Paesi Occidentali, il tumore del colon retto. Le metastasi epatiche di questa neoplasia possono essere trattate chirurgicamente, se individuate in tempo. Il ruolo della PET CT e' proprio una precoce individuazione di queste lesioni ed una loro migliore caratterizzazione rispetto alle tecniche tradizionali. Inoltre, lo studio molecolare del k-RAS e del suo stato permetterebbe, attraverso la PET CT, di individuare rapidamente, senza ulteriori indagini, I pazienti da sottoporre a terapie neoadiuvanti, per renderli operabili.