6 research outputs found
Automatic Abdominal Organ Segmentation from CT images
In the recent years a great deal of research work has been devoted to the development of semi-automatic and automatic techniques for the analysis of abdominal CT images. Some of the current interests are the automatic diagnosis of liver, spleen, and kidney pathologies and the 3D volume rendering of the abdominal organs. The first and fundamental step in all these studies is the automatic organs segmentation, that is still an open problem. In this paper we propose our fully automatic system that employs a hierarchical gray level based framework to segment heart, bones (i.e. ribs and spine), liver and its blood vessels, kidneys, and spleen. The overall system has been evaluated on the data of 100 patients, obtaining a good assessment both by visual inspection by three experts, and by comparing the computed results to the boundaries manually traced by experts
Automatic Abdominal Organ Segmentation from CT images
In the recent years a great deal of research work has been devoted to the development of semi-automatic and automatic techniques for the analysis of abdominal CT images. Some of the current interests are the automatic diagnosis of liver, spleen, and kidney pathologies and the 3D volume rendering of the abdominal organs. The first and fundamental step in all these studies is the automatic organs segmentation, that is still an open problem. In this paper we propose our fully automatic system that employs a hierarchical gray level based framework to segment heart, bones (i.e. ribs and spine), liver and its blood vessels, kidneys, and spleen. The overall system has been evaluated on the data of 100 patients, obtaining a good assessment both by visual inspection by three experts, and by comparing the computed results to the boundaries manually traced by experts
Efeito da disponibilidade de hospedeiro e de alimento nas caracter\uedsticas biol\uf3gicas de Trichogramma galloi Zucchi (Hymenoptera, Trichogrammatidae)
Efeito da disponibilidade de hospedeiro e de alimento nas caracterÃsticas biológicas de Trichogramma galloi Zucchi (Hymenoptera, Trichogrammatidae)
CaracterÃsticas biológicas de Trichogramma galloi Zucchi, 1988 foram avaliadas em laboratório onde esses parasitóides foram criados com ovos de Diatraea saccharalis (Lepidoptera, Pyralidae), com ou sem mel, e expostos a ovos do hospedeiro após 0, 6, 12, 24, 36, 48, 60, 72 e 84 horas da emergência. As taxas de parasitismo e de viabilidade mostraram-se elevadas para indivÃduos que receberam alimento. A razão sexual não foi influenciada pelo alimento. O número de indivÃduos por ovo somente mostrou diferença para aqueles adultos que não receberam alimento e permaneceram 6 horas sem ovos do hospedeiro. Conferindo o efeito da disponibilidade de ovos, somente a razão sexual, com ou sem mel, não mostrou diferenças. Os resultados mostram que T. galloi necessita de um suprimento de carboidratos e que o tempo pode influenciar a capacidade reprodutiva