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A Compact 64 Channel Real-Time MRI Reconstruction System

INTRODUCTION: A number of groups have developed systems for real-time reconstruction and display of MR images [1]. Although the feasibility of these systems was demonstrated some time ago [2], the technical challenges are significantly greater for real-time reconstruction and display of images in parallel imaging systems due to the large amounts of data which must be processed. For example, to acquire a 1.28ms echo digitized at a rate of 2.5MHz from a 64 channel receiver would result in 400KB of data generated for every acquisition, which would translate to 48MB of data generated per second for a TR of 8ms. Conventionally, this data had to be stored for all the acquisitions and then processed. This presented to two main disadvantages. Firstly, since the acquisition sizes were huge, the total numbers of acquisitions were limited to a small number by the system memory. Secondly, the image reconstruction had to be done off-line. One group has demonstrated a very robust 32 channel real-time data acquisition system [3]. This system is not widely available, and essentially beyond the capacity of most users to construct. We investigated a compact real-time method to overcome these challenges. This abstract reports a compact real-time data acquisition system capable of real-time demodulation of data from a 64 channel system. The system has been tested with TRs as little as 8ms. Additionally, the system allows periodic update of images on the computer screen, at frame rates of greater than 15 frames per second.