Incorporação de novas tecnologias em tomografia computadorizada

Gebrin, Eloísa M.M. Santiago

doi:10.1590/s0100-39842004000100001

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…(32) . (35,36) Figura 3: TC helicoidal multislices ou multidetectores (adaptada de Hofher, M. (34) (37) . Além disso, os tomógrafos de duas energias estão disponíveis em duas versões: com apenas um tubo de raios X ou com dois tubos de raios X, como mostra a Figura 4.…”

unclassified

Desenvolvimento e aplicação de um simulador pediátrico craniano para dosimetria em tomografia computadorizada

Martins¹

View full text Add to dashboard Cite

To determine the exposure levels and the absorbed dose in patients undergoing CT scans, is necessary to calculate the CT dose index in measurements with a PMMA or water phantom. The phantom must be enough to simulate the attenuation and scattering characteristics of a human body or parts in a radiation field. The CT specific quantities : CT air kerma index (Ca,100) , weighted CT air kerma index (CW), a total volume CT air kerma index (Cvol) and the CT air kerma-lenght product (PKL) must be determined and compared to literature reference levels. In this work a head pediatric phantom was developed, considering that the Brazilian published Diagnostic Reference Levels (DRL) are based on adult phantom measurements. This developed phantom shows a construction innovation using materials to simulate the skullcap, cortical bone (aluminum) and cancellous bone (PVC), and it was filled with distilled water. The phantom dimension follows the recommendations of the World Health Organization and the International Commission on Radiation Units for children from 0 to 5 years old head size: diameter of 160 mm and height of 155 mm. The skullcap has 4 mm of thickness and 111.9 mm of internal diameter. In order to evaluate its behavior, tests were carried out in calibration laboratories and in clinical beams. The results showed attenuation up to 23% when different materials are used as skullcap, demonstrating that the DRL's adopted could be overestimating the dose received by pediatric patients. It is observed that the dose received by CT skull scans presents different distribution, due to the skullcap partially attenuation and/or backscattering which is not considered when the PMMA phantom is used.

show abstract

unclassified

Desenvolvimento e aplicação de um simulador pediátrico craniano para dosimetria em tomografia computadorizada

Martins¹

View full text Add to dashboard Cite

show abstract

Effect of continuous positive airway pressure on fluid absorption among patients with pleural effusion due to tuberculosis

Oliveira¹,

Mello²,

Rodrigues³

et al. 2010

Rev. bras. fisioter.

View full text Add to dashboard Cite

Background: Tuberculosis (TB) remains as an important public health problem worldwide. The most common type is pulmonary TB, and the most prevalent form of extra-pulmonary disease among HIV-negative patients is pleural disease. Objective: The objective of the present study was to determine the effect of continuous positive airway pressure (CPAP) on fluid absorption among patients with pleural effusion due to TB. Methods: Twenty patients were randomized into two groups. The interventional group (n=10) received CPAP three times a week during the initial four weeks of anti-TB treatment, and the control group (n=10) received anti-TB drugs only. The primary endpoint was the volume of pleural fluid after four weeks of treatment. Both groups were submitted to thoracic computed tomography using threedimensional image reconstruction. The Mann-Whitney test for independent samples and the Wilcoxon paired samples test were used for statistical analysis. The normal distribution samples were analyzed using the unpaired t test. Results: The reduction of pleural effusion volume was significantly greater in the intervention group (83.5%±SD 3.6) than in the control group (36.9%±SD 2.9; p<0.001), and the final dyspnea index was lower in the Intervention group than in the control group (p=0.002). Conclusion: Our findings indicate that CPAP during the first month of TB treatment accelerates the absorption of pleural effusion, however, additional studies are needed to confirm these findings and evaluate the impact of CPAP on pleural sequelae after the end of anti-TB treatment.Article registered in the Clinical Trials under the number NCT00560521.Key words: physical therapy; pleural effusion; continuous positive airway pressure; pleural tuberculosis. ResumoContextualização: A tuberculose (TB) permanece como um importante problema de saúde pública no mundo. A forma mais comum de apresentação é a pulmonar e, em pacientes soronegativos, a forma de doença extrapulmonar mais prevalente é a pleural. Objetivo: Palavras-chave: fisioterapia; derrame pleural; pressão positiva contínua em vias aéreas; tuberculose pleural.

show abstract

Incorporação de novas tecnologias em tomografia computadorizada

Cited by 2 publications

References 0 publications

Desenvolvimento e aplicação de um simulador pediátrico craniano para dosimetria em tomografia computadorizada

Desenvolvimento e aplicação de um simulador pediátrico craniano para dosimetria em tomografia computadorizada

Effect of continuous positive airway pressure on fluid absorption among patients with pleural effusion due to tuberculosis

Contact Info

Product

Resources

About