Magnetic resonance imaging method with reduced acoustic noise

Details Magnetic resonance imaging method with reduced acoustic noise Magnetic resonance imaging method with reduced acoustic noise

2006-06-13

2006-06-13

Gutierrez, Diego (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

Reexamination Certificate

active

07061240

ABSTRACT:
A magnetic resonance imaging method comprises application of a pulse sequence which includes one or more pulses. The pulse sequence having an intrinsic scan time based on a full sampling rate in k-space for a predetermined full ‘field-of-view’ and a reference temporal pulse shape of the magnetic gradient pulses. A series of magnetic resonance signals is acquired by means of a receiver antennae system having a spatial sensitivity profile. Undersampled signal acquisition is applied to acquire undersampled magnetic resonance signals at a predetermined reduced sampling rate in k-space, the sampling rate being reduced by a reduction factor relative the full sampling rate. The pulse sequence being is during an actual signal scan time is applied. The actual signal scan time being larger than the intrinsic signal scan time times the reduction factor. The undersampling allows a smaller acquisition rate of the magnetic resonance signals and smaller slew rates and amplitudes of the magnetic gradient pulses and lower peak RF-fields of the refocusing pulses. Hence, lower acoustic noise and lower specific absorption rate are achieved.

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Intera Application Guide, Release 8, vol. 2: Scan Methods; 2001; Philips Medical Systems; Nederland B.V.; Netherlands, pp. 5-8.

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