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Radiologia 2004;46:133-50 - DOI: 10.1016/S0033-8338(04)77952-7
Surcando el espacio-kpara mejorar la imagen por resonancia magnética
Exploring k-Space for Improved MR Imaging
David Moratal-Péreza, José Millet-Roiga, Francisco Castellsa, Luis Martí-Bonmatíb,, Marijn E. Brummerc
a Departamento de Ingeniería Electrónica. Universitat Politècnica de València. Valencia.
b Servicio de Radiología. Clínica Quirón. Valencia. España.
c Radiology Department. Emory University School of Medicine. Atlanta. EE.UU.
Recibido 12 junio 2003, Aceptado 05 diciembre 2003

What marks the difference between magnetic resonance (MR) and other medical imaging techniques is that the user has complete control over both the way in which data is acquired and how it can be manipulated in presenting the final image. The radiologist can modify resolution, field size, contrast, acquisition speed, artifact influence, and many other parameters which contribute in producing the final image.

The vehicle of this control is known as k-space, and is nothing more than a matrix of unprocessed output data from the MR unit before applying Fourier transformation, which will in turn provide a final reconstructed image. The user would necessarily be required to understand those concepts and mechanisms related to k-space. Only then could optimum results be yielded in regard to spatial resolution, temporal resolution and image quality.

The principal problem lies in the fact that k-space is an abstract concept. Although its content can be visualized, the data of which it is comprised makes little sense and suggests no apparent relation to MR imaging. On the other hand, the mathematical construction used to describe it in detail is sophisticated and complicated, and does not easily lend itself to an intuitive understanding of precisely what it is that k-space entails. This article analyzes this little known yet widely used concept in MR imaging.

Palabras clave
Espacio-k, Resonancia magnética, Técnicas de imagen
Key Word
k-Space, Magnetic Resonance, Imaging Techniques
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LUIS MARTÍ-BONMATÍ. Sección de RM y TAC. Servicio de Radiología. Hospital Universitario Doctor Peset. Avda. Gaspar Aguilar, 90. 46017 Valencia. España. (Luis Martí-Bonmatí )
Copyright © 2004. Sociedad Española de Radiología Médica (SERAM) and Elsevier España, S.L.