Omega-space adaptive acquisition technique for magnetic resonance imaging from projections.
J Magn Reson
; 143(1): 197-207, 2000 Mar.
Article
in En
| MEDLINE
| ID: mdl-10698660
ABSTRACT
An omega-space adaptive acquisition technique for MRI from projections is presented. It is based on the evaluation of the information content of a set composed of four initial projections, measured at angles 0 degrees, 45 degrees, 90 degrees, and 135 degrees, followed by the selection of new angles where the information content is maximum. An entropy function is defined on the power spectrum of the projections that is useful for evaluating the information content of each projection. The method makes it possible to reduce the total acquisition time with little degradation of the reconstructed image and it adapts to the arbitrary shape of the sample. For this reason, it can be particularly useful in those applications where acquisition from projections is strongly recommended to save acquisition time, such as functional MRI, imaging of species having very short T(2), or angiography. The method has been tested both on simulated data and on experimental data collected by a commercial MRI apparatus. The method has also been compared to the regular acquisition method, that is, the standard acquisition method in MRI from projections.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Magnetic Resonance Imaging
Language:
En
Journal:
J Magn Reson
Journal subject:
DIAGNOSTICO POR IMAGEM
Year:
2000
Document type:
Article
Affiliation country:
Italy