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TIME-BASE SYNCHRONIZATION IN HYBRID MAGNETIC RESONANCE (MR) AND POSITRON EMISSION TOMOGRAPHY (PET) SCANNER

IP.com Disclosure Number: IPCOM000199441D
Publication Date: 2010-Sep-04
Document File: 4 page(s) / 38K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention discloses a hybrid Magnetic Resonance (MR) scanner and Positron Emission Tomography (PET) scanner arrangement that is constructed using a combined time-base signal. A single master clock is configured to drive both the MR scanner and the PET scanner where signals needed by the MR scanner include transmit and receive signals occurring at Larmor frequency of the scanner. Both the MR scanner and the PET scanner are driven with appropriate modulation. Time synchronization between the MR scanner and the PET scanner minimizes MR imaging artifacts generated by the PET scanner. The artifacts are minimized by phase locking all electronic PET scanner signals to the MR scanner.

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TIME-BASE SYNCHRONIZATION IN HYBRID MAGNETIC RESONANCE (MR) AND POSITRON EMISSION TOMOGRAPHY (PET) SCANNER

BRIEF ABSTRACT

    The present invention discloses a hybrid Magnetic Resonance (MR) scanner and Positron Emission Tomography (PET) scanner arrangement that is constructed using a combined time-base signal. A single master clock is configured to drive both the MR scanner and the PET scanner where signals needed by the MR scanner include transmit and receive signals occurring at Larmor frequency of the scanner. Both the MR scanner and the PET scanner are driven with appropriate modulation. Time synchronization between the MR scanner and the PET scanner minimizes MR imaging artifacts generated by the PET scanner. The artifacts are minimized by phase locking all electronic PET scanner signals to the MR scanner.

KEYWORDS

    Hybrid PET scanner and MR scanner synchronization, steak artifacts in MR images, phase locked, master clock of the MR scanner, Larmor Frequency, Time synchronization.

DETAILED DESCRIPTION

    A typical hybrid MR and PET scanner system should have two imaging systems that simultaneously work together. In the hybrid MR and PET scanner system, if the MR scanner operates without image artifacts generation any weak electromagnetic signals from the PET scanner electronics get suppressed. The weak electromagnetic

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    RP13480

 

signals are generated from multiple control and data signals (and associated harmonics) of the PET scanner system.

    It is generally desirable to have a hybrid MR and PET scanner without any artifacts generation. However, an Electromagnetic Interference (EMI) causes creation of streak artifacts in an image generated by the hybrid MR and PET scanner. The streak artifacts occur at discrete frequencies within frequency dimension of the image and the streak artifacts occur to an extent that they are not phase coherent with the MR imaging process for the hybrid MR and PET scanner. A conventional method for reducing effects of EMI on the MR image is to encase all PET electronics in a Faraday cage whose penetrations are filtered to suppress as much of the frequency content in the MR imaging band. Further, the steak artifacts are spread along the phase-encoding direction of the hybrid MR and PET scanner. Further, if a frequency of the EMI drifts with respect to the MR signal, the streak will have movement along with a broader appearance.

    Therefore, there is a need in the art for time synchronizing the transmitter a...