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METHOD FOR CHECKING SUFFICIENCY OF MULTI COIL BIAS IN MAGNETIC RESONANCE IMAGING MRI SYSTEMS

IP.com Disclosure Number: IPCOM000243877D
Publication Date: 2015-Oct-26
Document File: 3 page(s) / 51K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method to check sufficiency of asserted bias power to ensure the RF pulse does not damage the receive chain hardware of a magnetic resonance imaging MRI system is disclosed The method comprises the following steps A decoupling bias is injected to multi coil to make coil transit into decoupled mode Radiofrequency RF amplifier transmits an RF pulse to make receive coil induce a signal Power of the RF pulse is maintained at levels that ensure that receive component is safe Signal is acquired while RF pulse is transmitting Root mean square RMS of received signal is computed and compared to a safe threshold If the decoupling bias voltage or current is not sufficient power of the signal exceeds the safe threshold MRI scan is not carried out The scan is carried out only when the decoupling bias injected is found to be sufficient and RMS of received signal does not exceed the safe threshold

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METHOD FOR CHECKING SUFFICIENCY OF MULTI-COIL BIAS IN (MAGNETIC RESONANCE IMAGING) MRI SYSTEMS

BACKGROUND

 

The present disclosure relates generally to magnetic resonance imaging (MRI) systems and more particularly to a method for checking safety of multi-coil bias in MRI systems.

Usually in a magnetic resonance imaging (MRI) system, receive coil elements are decoupled from the system when RF pulse is being transmitted.  The receive coil elements are decoupled by injecting a bias current or voltage to a diode of multi-coil channels. Decoupling is done to prevent receiver component of the system from braking down by induced electricity form the receive coil.

The bias current or voltage value is derived from specification of the coil hardware and is recorded in an MRI file system. However, there is a risk that the bias current value may be incorrect. Conventional techniques check whether the bias current or voltage value is same as expected value derived from the specification. However, conventional techniques do not check whether such bias current or voltage value derived from the specification is effective in providing the required decoupling and safety. Therefore, the conventional techniques present a risk that incorrect bias current or voltage is injected to the multi-coil channels and hardware of the MRI system is damaged.

 

It would be desirable to have a method for checking sufficiency of bias current or voltage injected to decouple the receive coil elements of the MRI system.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 depicts an implementation of the method for checking sufficiency of bias current or voltage injected to decouple receive coil elements of an MRI system.

DETAILED DESCRIPTION

A method to check sufficiency of asserted bias power to ensure the RF pulse does not damage the receive chain hardware of a magnetic resonance imaging (MRI) system is disclosed. The method described herein mitigates risk of incorrect or insufficient current or voltage bias being asserted due to derivation from specification of coil hardware.

The method is performed before starting a scan to check whether the bias derived from the specification is sufficient and safe for the MRI system. The method comprises the following steps. A decoupling bias is injected to multi-coil to make coil transit into decoupled mode. Radiofrequency (RF) amplifier transmits an RF pulse to make receive coil induce a signal. Power of the RF pulse is maintained at levels that ensure that receive component is safe. Signal is acquired while RF pulse is transmitting. Root mean square (RMS) of received the received signal is computed and compared to a safe threshold. If the decoupling bias voltage or current is not sufficient, power of the signal exceeds the safe threshold, MRI scan is not carried out. The scan is carried out only when the decoupling bias injected is found to be sufficient and RMS of received signal does not exceed the safe threshold.

Figure 1 depicts an implementati...