Examines the advantages and disadvantages of using a Karhunen-Loeve (K-L) expansion of a training set of images to reduce the number of encodes required for a magnetic resonance (MR) image of a new object. One form of this technique has been proposed (Yue Cao and Levin, 1993) and another implemented (Zientara et al., 1994). The present authors evaluate: a) the error likely to be achieved as a function of the number of encodes and b) two technical problems: reduced SNR in the images and smoothing of the K-L functions in practice. They propose the use of localized trigonometric bases developed by Coifman and Wickerhauser (1992) as an alternative to the K-L basis. The localized trigonometric bases approach the error achieved by the K-L basis, but they are easier to use and can be used with existing methods for fast acquisition.<>


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    Titel :

    Acquisition of the Karhunen-Loeve expansion to reduce MR imaging times


    Beteiligte:
    Weaver, J.B. (Autor:in) / Healy, D.M. (Autor:in)


    Erscheinungsdatum :

    01.01.1994


    Format / Umfang :

    525379 byte




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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