Biomedical subjects

N Bolognini

Publications and source records attributed to N Bolognini.

3 recordsLinked to original sources

PubMed2003

Modulated speckle simulations based on the random-walk model.

The random-walk model is employed to simulate modulated speckle patterns. We demonstrate that the geometrical image approximation fails to describe the modulated speckle pattern. A new approach to analyzing this phenomenon is proposed. The validity of the approximations employed is verified by comparison of the simulation with the experimental results. Speckle metrological applications and phase measurement techniques could be improved by taking advantage of this model.

Journal Article↗

PubMed2000

Speckle photography with different pupils in a multiple-exposure scheme.

The use of different multiple-aperture pupils for recording each image in speckle photography is proposed. The introduction of suitable spatial frequency carriers, by internally modulating imaged speckles, allows one to selectively isolate or combine the spectral content of different images into spatially separated regions in the Fourier plane. Theoretical and experimental results extend the speckle photography technique to the depiction of several specklegrams of multiple uniform in-plane displacements. In this case, because different pupils are considered for recording, the cross-correlation functions for the amplitudes and intensities in the image plane are calculated on the basis of the statistical properties of the object. Also, the ensemble-average intensity in the Fourier plane is analytically derived, and fringe visibility is investigated.

Light↗

PubMedDate not supplied

Management of major forefoot trauma.

Clinicians treating foot trauma should be familiar with the basic principles of wound management, such as debridement, fasciectomy, primary versus delayed wound closure, and the prevention and treatment of gas gangrene (1,2,4-6). Treatment modalities vary, depending on training and personal experience. In severe cases of foot trauma, such as crush injuries and open fractures involving skin, underlying soft tissue, and bone, the authors advocate staging of treatment with frequent assessment of the wounds. Furthermore, we recommend judicious preservation of bone and soft tissue in the initial management of such cases. Four cases have been presented to illustrate these principles.

Accidents, Home↗