Abstract
Conventionally, percutaneous microwave coagulation therapy has been performed under ultrasonical guidance using a real-time puncture transducer. Recently, development of open MR scaner and imaging technique allows interventional MRI. MR imaging can provide us with more useful intraoperative visualization in the PMCT field than is available to ultrasonical imaging.
To establish MR Imaging guided-percutaneous microwave coagulation therapy, the specially designed MRI compatible percutaneous needle-electrode (percutaneous needle-electrode MRI) and the coaxial cable were used. MR images of several types of the needle-electrode MRI, inserted to the extracted pig liver, were evaluated. Then, the noises on the display in relation to microwave irradiation were studied. Desiable MR image could be got by using the percutaneous needle-electrode MRI. MR image were strongly influenced by the noises, caused by only connecting the percutaneous needle-electrode MRI to the microwave tissue coagulater with coaxial cable. A SEIWA noise shealding product protected the noises completely. With this materials the noises were also protected during microwave irradiation.
Further more investigative efforts will be directed towards developing MR Imaging guided-percutaneous microwave coagulation therapy that assures us of better patient outcome in the treatment of small liver cancer.
