In trabecular bone the NMR linewidth is found to be governed by the magnetic field inhomogeneity arising from the difference in magnetic permeability between bone and marrow. T2\* was measured in vivo in the distal femur by interferometry and localized spectroscopy. Both methods showed T2\* to be in
Full Automation of Quantitation of in Vivo NMR by LPSVD(CR) and EPLPSVD
โ Scribed by A. Diop; W. Kolbel; D. Michel; A. Briguet; D. Graverondemilly
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 291 KB
- Volume
- 103
- Category
- Article
- ISSN
- 1064-1866
No coin nor oath required. For personal study only.
โฆ Synopsis
A full automatic and reliable method for NMR quantification is proposed. It is based on the linear prediction singular-value decomposition with continuous regularization [LPSVD(CR)] and on the enhancement procedure (EP) followed by LPSVD (EPLPSVD). Advantages of both methods have been considered. LPSVD(CR) has been used to find a good estimate for the number of spectral components. A signific?nce test allows refining this number, which is then used in the EPLPSVD method. A Monte Carlo study has proved that EPLPSVD is a maximum-likelihood estimator. This new algorithm leads to reliable estimates for the spectral parameters even for signals with a low signal-to-noise ratio. No a priori knowledge is needed. c 1994 Academic Press. Inc.
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