Magnetic resonance imaging装置に対応した微動台の開発

概要

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A magnetic resonance imaging (MRI) system compatible linear stage was developed. The stage was made of acrylic plastic and moving power was applied by an ultrasonic motor. Moving distance of the stage was detected by counting the number of motor rotations using a optic fiber sensor. Accuracy and precision of the stage control were measured inside and outside the magnet using a micrometer and a laser distance meter. As a result, a value of more than 95% was achieved in both of them in the 1.5 T magnetic field when it was applied for more than a 0.3 mm movement. Measurement of the slice sensitivity profile (SSP) by the delta method was performed. Slice selection by this linear stage and by radio frequency (RF) offset were compared. The result by linear stage was in good agreement with the result by RF offset. With this linear stage, a performance evaluation test of MRI equipments that need micromotion can be performed.