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Filtering Techniques Assessment Towards Pose Estimation Enhancement for Image-Based Proximity Navigation with Uncooperative Space Objects
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Hepatic abscesses in immunocompromised patients: ultrasonically guided percutaneous drainage.
No full textAbstract: Ultrasonically guided percutaneous drainage (US-PD) is considered first-line therapy for hepatic abscesses, but no data are available on its efficacy in severely immunocompromised patients. Therefore, we examined 15 such patients in whom one or more hepatic abscesses of different etiology were treated with US-PD. Eleven patients underwent needle aspiration and four had catheter drainage under US guidance. In 12 cases we achieved complete healing of the abscesses. In one case, clinical improvement was obtained but surgery was required for cure. In another case (fungal abscess in AIDS), we had no improvement and the patient died. No procedural complications were observed. Seven patients died during the follow-up periods of up to 49 months from their underlying disease. We conclude that US-PD must be considered the therapy of choice for hepatic abscess (except the fungal lesions) in severely immunocompromised patients
Multispectral Vision Based Relative Navigation to Enhance Space Debris Proximity Operations
No full textMultispectral Imaging Sensors for Asteroids Relative Navigation
Full text linkCurrent missions to asteroids largely rely on visible imaging to perform relative navigation with respect to the target surface. A consequence of observing the body in the visible band is the large influence of illumination conditions, which could be mitigated by an imaging system working in other spectral bands. This paper studies the possibility to exploit multispectral imaging sensors for improving spacecrafts relative navigation in proximity of asteroids. Realistic sensors models are considered and thermal images are synthetically generated exploiting physics-based models. An optical navigation algorithm for pose estimation is tested with visible and thermal images, proving the possible advantages of the multispectral strategy
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