Theoretical Evaluation and Comparison of Fast Chemical Shift Imaging Methods

✍ Scribed by R. Pohmann; M. von Kienlin; A. Haase

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 327 KB
• Volume: 129
• Category: Article
• ISSN: 1090-7807
• DOI: 10.1006/jmre.1997.1245

✦ Synopsis

Magnetic resonance chemical shift imaging (CSI) is becoming

To cope with the long experimental duration, a number the method of choice for localized NMR spectroscopic examinaof fast CSI sequences have been developed in the past years, tions, allowing simultaneous detection of NMR spectra from a mostly derived from one of the fast imaging techniques. By large number of voxels. The main limitation of these methods is ingeniously varying how spatial and spectral information is their long experimental duration. A number of fast CSI experiobtained, they attempt to reduce the experiment time and to ments have been presented, promising to reduce that duration. In still obtain a good SNR. As the spatial resolution will ultithis contribution the criteria for evaluating and optimizing the mately be limited by sensitivity, it is crucial that any of these sensitivity of fast CSI experiments are elaborated. For a typical fast methods exploit the available magnetization at its best.

experiment in the human brain, the performance of various meth-

In the present work we have established criteria for anaods is compared. While conventional CSI provides optimal sensilyzing the properties of the most prominent fast CSI setivity per unit time, it is shown in which circumstances fast sequences allow a shorter experimental duration. Using these results, quences. In the first section, the general parameters needed the best method for any experimental requirements can be selected. to compare the performance of an experiment are defined.