ABSTRACT
A radiografia de tórax é um dos exames preconizados para detecção de pneumonia na infância pela Organização Mundial de Saúde. Durante a execução do exame é comum encontrar artefatos nessas imagens radiográficas como:rótulos de identificação, marcas de dedos, botões de camisa, dentre outros, principalmente quando digitalizadas por meio de câmeras fotográficas. Esses artefatos além de tirarem o anonimato da radiografia, afetam significativamente sua análise por sistemas informatizados de detecção e suporte a identificação de doenças. Este trabalho apresenta um método eficiente para identificação dos artefatos, composto de 3 etapas principais: filtragem de pixels baseada em histograma,detecção de bordas com algoritmo de Roberts e filtragem espacial por filtro de desvio padrão. Este método foi experimentado em uma base de 200 imagens e inspecionado visualmente para identificação de erros. Resultados experimentais como, eficiência (tempo processamento/radiografia) ≈ 7ms e precisão de 0,98 demonstram que o método é bastante promissor.
Chest radiography is one of recommended imaging test by World Health Organization for childhood pneumonia diagnosis. However, during patient examination is very usual finding artifacts in these images, such as identification labels, fingerprints, shirt buttons, and so forth. Moreover, when these images are digitally scanned, other problems raise suchas noise, brightness control and so on. Artifacts can reveal private data and expose patient identification. Furthermore, these artifacts can significantly damage automatic analysis by computer diagnosis aided systems. This works presents anefficient method for artifact identification composed by 3 main stages: histogram based pixel filtering, edge detection withRoberts algorithm and standard deviation spacial filtering. This method has been experimented upon 200 images databaseand presented about 7ms of time processing per image. Visually inspection was used to error measuring and we achieve 0,98 of precision. As a result of this, the method demonstrate a very promising preprocessing tool.
Subject(s)
Humans , Image Processing, Computer-Assisted , Foreign Bodies/radiotherapy , Radiography, Thoracic , Congresses as TopicABSTRACT
Although rare, foot injuries caused by toothpicks can result in serious complications such as severe pain, local inflammation and infection in several days, and a delayed granulamatous foreign-body reaction in weeks or months. For this reason they should be removed from the tissue in the early phase. Here, we report case of penetration injury caused by a toothpick treated using Er: YAG laser ablation.
Subject(s)
Foreign Bodies/radiotherapy , Lasers, Solid-State/therapeutic use , Low-Level Light Therapy/methods , Child , Humans , MaleSubject(s)
Bronchi , Foreign Bodies/radiotherapy , Child , Child, Preschool , Female , Foreign Bodies/surgery , Humans , Imaging, Three-Dimensional , Infant , Male , Retrospective StudiesABSTRACT
Intracranial penetrating injury through the nose is rare. We present a case of a 79 year-old patient who had intracranial penetrating injury with a wooden object accompanied by massive bilateral pneumoencephaly with the presence of a foreign body in the ethmoid bone with fracture and displacement of crista galli. This is a hitherto unreported retained foreign body with fractured ethmoid resulting in bilateral pneumoencephaly.
Subject(s)
Ethmoid Bone/diagnostic imaging , Foreign Bodies , Pneumoencephalography/methods , Wounds, Penetrating/complications , Aged , Female , Foreign Bodies/etiology , Foreign Bodies/pathology , Foreign Bodies/radiotherapy , HumansABSTRACT
The Q-switched ruby laser is currently used in the treatment of amateur and professional decorative tattoos. The present study documents the clinical management and follow-up of 12 subjects with traumatic tattoos treated with the Q-switched ruby laser. The results of this study indicate that an excellent clinical outcome can be achieved with substantial removal of the targeted foreign pigmented matter while potential adverse effects are significantly reduced. Hypopigmentation, which occurred in four patients (33.3 percent), was temporary and resolved spontaneously in all subjects within 6 months of laser exposure. There was no hypertrophic scarring, atrophy, or induration seen in any of the subjects treated with the Q-switched ruby laser.
