The purpose of this paper is to identify effective methods to reduce the interference between PET and MRI. First, the author theoretically calculated the magnetic and electrical fields from the radiofrequency (RF) coil as a function of the distance from it. Then with a 0.3-T MRI and a silicon photomultiplier (Si-PM) block detector, the author measured the RF-induced noise signal amplitudes as a function of the distance from the coil. Although both the magnetic and electrical fields decreased dramatically as the distance from the coil increased, the magnetic field decreased more rapidly than the electrical field. From experiments, the induced noise signal decreased rapidly as the distance from the coil increased. With these results, the most effective method to reduce the interference between PET and MRI is taking the distance between the coil and the Si-PM arrays. Using the Cu shield around the detector will not be very effective in PET/MRI systems since it is located in the near field where the magnetic field in RF is dominant.
|Number of pages||5|
|Journal||IEEE Transactions on Radiation and Plasma Medical Sciences|
|Publication status||Published - 2017 Sept|
- near field
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Radiology Nuclear Medicine and imaging