Aims and objectives
Preliminary study to determine the feasibility to perform real-time MRI and Ultrasound fusion imaging of leg muscles.
Tests were carried out by first acquiring leg muscle images while subject was lying supine and then standing using an Esaote MRI GScan Brio system.
GScan Brio (Fig.
1) is a tilting MRI system equipped with a permanent magnetic unit (0.25T) that is able to rotate magnet and patient’s bed from 0 to 90 degrees while scanning muscles in conventional (supine) and weight-bearing...
Methods and materials
Three (3) normal subjects were studied (ages 36,
41; 1 female,
All of the subjects could stand firmly for an average of 15 minutes during the acquisition of the weight bearing MRI images (the same time frame was required for the acquisition of supine MRI images). A total of around 35 minutes,
including patient positioning,
was required for the full supine plus standing image acquisitions.
Twenty minutes were needed also for the fusion imaging session (with an extra 3 minutes...
MRI image acquisitions: Dedicated pads were placed over and under the leg (Fig.
4) of the subject being examined to ensure a stable positioning and that the anatomical structures were within FoV magnet's range during weight bearing image acquisitions. The use of pads did not affect leg muscular shape or produce any major leg shape deformation which would have entailed an MRI-US fusion imaging registration error.
Pads were required also for supine image acquisitions in order to assure,
Fusing MRI with real-time Ultrasound was always successful achieved with the three subjects and always led to a 5 to 2 mm registration error also on first attempt. The highest spatial resolution algorithm worked properly by automatically switching between the two acquired MRI scans.
The highest spatial resolution was always selected based on the Ultrasound acquisition plane spatial position. Real-time fusion imaging between MRI and Ultrasound can be successfully achieved when examined subject...
Marinella Marinoni, Neurology Dept.,
Careggi University Hospital,
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