| 摘要 |
<p>Methods are known for reconstructing magnetic resonance images from a magnetic resonance measurement performed on a body, which methods utilize only one half (or slightly more) of the data of the complete resonance measurement for reaching a resolution corresponding to a complete resonance measurement. Such methods utilize an estimation of the phase of the image from data known as sampling values from a central part of a data matrix filled with the sampling values, the partly filled data matrix being supplemented by zeroes prior to the reconstruction of the image. The known methods offer reasonable results, subject to the condition that the phase of the image varies smoothly and changes slowly in the relevant image dimension. A method is proposed for reducing the residual artefacts, such as blurring, which occurs in the image when the known methods are used, for example due to phase errors. In accordance with the proposed method, a number of steps are performed per column in the data matrix so as to produce an ever better estimation for the data not known from sampling. After the reconstruction, the image will have a phase which at least approximates the phase estimated from the central part of the data matrix. In the case of phase errors, substantially no residual artefacts will remain and at the same time the signal-to-noise ratio in the image will be superior to that obtained by means of the known methods.</p> |
