Search results for "dios"
showing 10 items of 1322 documents
NeXt for neuro-radiosurgery: A fully automatic approach for necrosis extraction in brain tumor MRI using an unsupervised machine learning technique
2017
Stereotactic neuro-radiosurgery is a well-established therapy for intracranial diseases, especially brain metastases and highly invasive cancers that are difficult to treat with conventional surgery or radiotherapy. Nowadays, magnetic resonance imaging (MRI) is the most used modality in radiation therapy for soft-tissue anatomical districts, allowing for an accurate gross tumor volume (GTV) segmentation. Investigating also necrotic material within the whole tumor has significant clinical value in treatment planning and cancer progression assessment. These pathological necrotic regions are generally characterized by hypoxia, which is implicated in several aspects of tumor development and gro…
Value of serial magnetic resonance imaging in the assessment of brain metastases volume control during stereotactic radiosurgery
2016
AIM To evaluate brain metastases volume control capabilities of stereotactic radiosurgery (SRS) through serial magnetic resonance (MR) imaging follow-up. METHODS MR examinations of 54 brain metastases in 31 patients before and after SRS were reviewed. Patients were included in this study if they had a pre-treatment MR examination and serial follow-up MR examinations at 6 wk, 9 wk, 12 wk, and 12 mo after SRS. The metastasis volume change was categorized at each follow-up as increased (> 20% of the initial volume), stable (± 20% of the initial volume) or decreased (< 20% of the initial volume). RESULTS A local tumor control with a significant (P < 0.05) volume decrease was observed in 25 meta…
Stereotactic body radiation therapy for liver oligometastases: predictive factors of local response by 18F-FDG-PET/CT
2018
Objective:To investigate metabolic parameters as predictive of local response after stereotactic body radiation therapy (SBRT) for liver-oligometastases.Methods:Inclusion criteria of the present re...
Radiosurgical Treatment of low flow Carotid-Cavernous Fistulae
1991
The good results obtained by stereotactic radiosurgery in arteriovenous malformations has led the authors to expect similar results in low flow carotid-cavernous fistulae. In this paper, 20 cases who underwent radiosurgery with a conventional gamma source are presented. The total dose delivered was 36 to 40 Gy. 90% of the patients were cured after radiosurgery after a mean time of 7 months. Those presenting a mild improvement after a mean time of 2 months and those with a marked improvement after 4 months.
Radiosurgery of Carotid-Cavernous Fistulae
1994
25 cases of carotid-cavernous fistulae (CCF) who underwent radiosurgery with a conventional gamma source from 1977 to 1992 are reported. 22 were low-flow, spontaneous CCFs and 3 were high flow fistulae which had undergone a previous trApplng. The total dose delivered was 30 to 40 Gy. 91% to patients with low-flow CCF cured after radiosurgery in a mean time of 7.5 months, presenting improvent in a mean time of 2.3 months. Only one of the high-flow fistulae was cured. Follow-up period ranged between 14 years and 15 months (mean: 50 months). No recurrence was recorded in any case. While intravascular embolotherapy is the treatment of choice for high-flow fistulae, stereotactic radiosurgery may…
Dynamics of gut mucosal and systemic Th1/Th2 cytokine responses in interferon-gamma and interleukin-12p40 knock out mice during primary and challenge…
2009
Cryptosporidium parvum is an intracellular parasite causing enteritis which can become life-threatening in the immunocompromised host. CD4+ T cells and interferon (IFN)-gamma play dominant roles in host immune response to infection. However, effector mechanisms that are responsible for recovery from infection are poorly understood. In the present study we analyzed mice deficient in IFN-gamma or interleukin (IL)-12 in parallel to C57BL/6 wild type mice as models for murine cryptosporidiosis. Our results identified IFN-gamma as the key cytokine in the innate as well as adaptive immunity during primary and also challenge C. parvum infection. Furthermore, both Th1 and Th2 cytokines appear to co…
68 ga-dotatoc pet/ct follow up after single or hypofractionated gamma knife icon radiosurgery for meningioma patients
2021
68Ga-DOTATOC represents a useful tool in tumor contouring for radiosurgery planning. We present a case series of patients affected by meningiomas on who we performed 68Ga-DOTATOC positron emission tomography (PET)/CT pre-operatively, a subgroup of which also underwent a post-operative 68Ga-DOTATOC PET/CT to evaluate the standardized uptake value (SUV) modification after Gamma Knife ICON treatment in single or hypofractionated fractions. Twenty patients were enrolled/included in this study: ten females and ten males. The median age was 52 years (range 33–80). The median tumor diameter was 3.68 cm (range 0.12–22.26 cm), and the median pre-radiotherapy maximum SUV value was 11 (range 2.3–92). …
Medios de comunicación de masas y comunicación digital
2006
Sumario: 6.1. Concentración multimedia: apuntes previos sobre el sistema de medios de comunicación en España. 6.1.1. Medios de titularidad pública. 6.1.2. Aumento del pluralismo. 6.1.3. Concentra- ción de la oferta. 6.2. Medios de comunicación colectiva en Internet. 6.2.1. La «nueva economía» como estrategia vulneradora del pluralismo. 6.2.2. Del canal al contenido: el experimento fallido de los portales. 6.2.3. Dependencia de los medios tradicionales. 6.2.4. Oferta plural, mercado concentrado
Campus virtuales : revista científica iberoamericana de tecnología educativa
2019
Resumen basado en el de la publicación Resumen en inglés Se presentan los resultados de un estudio descriptivo cuyos objetivos principales eran conocer los portales institucionales de dos países (Argentina y Brasil), analizar la oferta de materiales didácticos digitales dirigidos a la etapa de educación primaria y realizar una serie de recomendaciones o propuestas para modificar las prácticas docentes hacia un modelo de enseñanza mediada por tecnología. Los resultados muestran la existencia de portales institucionales que se consideran una de las principales fuentes de materiales didácticos digitales utilizados por los docentes para acceder a recursos útiles en la escuela. Se concluye que e…
Ojos que ven, corazón que siente. La infraestructura de la visita guiada
2011
Resumen basado en el de la publicación Título, resumen y palabras clave también en inglés Monográfico con el título: "Arte, Maestros y Museos" Se cuestionan algunas de las evidencias sobre las que se asienta la práctica educativa "visita guiada al museo". ¿Qué es una visita guiada? ¿Es una construcción o es una realidad esencial? Y si es una construcción ¿qué elementos la forman?. Se intentan resolver todas estas cuestiones. ESP