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METHOD OF DETERMINING PEAK EXCITATION FIELD STRENGTH

IP.com Disclosure Number: IPCOM000201284D
Publication Date: 2010-Nov-10
Document File: 5 page(s) / 108K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method of determining peak excitation field strength in a Magnetic Resonance Imaging (MRI) system is disclosed. The method comprises a step of measuring the power factor of an RF transmit coil when a patient is positioned inside the RF transmit coil of the MRI system. . The method improves the accuracy of the estimated peak excitation field strength which in turn enhances the performance of the MRI system.

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METHOD OF DETERMINING PEAK EXCITATION FIELD STRENGTH FIELD OF INVENTION

The invention generally relates to Magnetic Resonance Imaging (MRI) techniques and more particularly to an MRI technique that produces maximum output power.

BACKGROUND OF THE INVENTION

In conventional techniques, peak excitation field strength is limited by maximal power of radio frequency (RF) amplifier. The cost of an RF amplifier directly depends on power. For example, in some compact Magnetic Resonance Imaging (MRI) systems the power of RF amplifier reduces to 10 kilo watt (KW) to achieve lower cost. As a result, the peak excitation field strength is reduced from 24microtesla (uT) to 19 uT. A smaller peak excitation field strength value causes longer echo time (TE), extrasensory perception (ESP) etc, which reduces the performance of the MRI system. The conventional technique involves estimation of power factor, whereby peak excitation field strength is estimated. Pulse sequence database (PSD) uses the estimated peak excitation field strength to generate waveform. FIG. 1 shows a workflow diagram illustrating the conventional technique.


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