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Biomedical subjects

B C De Simone

Publications and source records attributed to B C De Simone.

9 recordsLinked to original sources
PubMed2002

Electrical impedance tomography via filtered-back projection of fan current distribution: a numerical simulation.

An approach to electrical impedance tomography (EIT) data acquisition inspired by NMR-filtered back-projection imaging with fan isochromat distribution is proposed. A current projection is generated by injecting current at a certain point of the sample and simultaneously collecting the current itself at different points on the half space opposite the point of current injection. After that, the injection is shifted to another point and collected as above and so on. A very simple algebra and software support the numerical simulations. This method is expected to be more sensitive than the traditional method based on potential measurements. A preliminary low resolution experiment is presented.

Algorithms↗
PubMed1992

Lee-Goldburg solid-state imaging.

A new approach to solid-state imaging (SSI) is presented. The method relies on narrowing the resonance line using the Lee-Goldburg sequence. The technique is easy to implement in practice and may find widespread applications in materials science.

Magnetic Resonance Spectroscopy↗
PubMed1988

Maximum entropy and 2DFT NMR images.

A comparison between contrast and signal-to-noise ratio (SNR), as obtained by both maximum entropy (ME) and 2DFT reconstruction, is reported for NMR images. Our results show that in the ME elaboration the contrast and SNR are generally increased with respect to the 2DFT elaboration. The magnitude of such an increase depends on the ME statistical parameter and also, quite strongly, on the values of contrast and SNR of the 2DFT image.

Magnetic Resonance Imaging↗
PubMed1986

Modified crossed-ellipse radiofrequency coil for MRI.

New coil geometries obtained by computer simulations from the crossed-ellipse rf coil are reported. These geometries with elliptical transverse section improve the signal-to-noise ratio with respect to the classic ellipse and saddle coils. The increase of signal-to-noise ratio is mainly due to the reduction of coil losses and to the better B1 efficiency and distribution.

Abdomen↗
PubMed1982

Role of 3D imaging in small scale NMR tomography.

Some advantages of using 3D techniques in small scale NMR imaging are suggested. In particular the 3D methods are likely to be useful in slow dynamical processes occurring in vivo. Three-dimensional images obtained with our first home built prototype are also reported.

Animals↗