Question normal

This is a fantastic research of using radiation to cure the VT. My question is : As I known, SBRT was not as a accurate radiation therapy as cyberknife, why not use cyberknife or Tomotherapy to make this treatment?
How about the resolution of electrocardiographic imaging?
Then , I think using magnetic field ,or using the change of magnetic field (generate the current in our heart )may also cure the cardiac arrhythmia! Maybe, appropriate electric field would make sense!