1. A method for determination of a state of positively charged particles of a charged particle beam entering a patient along a beam path, comprising the steps of: using a beam transport system to transport the positively charged particles from a synchrotron to an exit nozzle, a slideably insertable beam insert positioned proximate said exit nozzle; reshaping the charged particle beam using the beam insert; positioning a first imaging sheet in the beam path between said beam insert and the patient; and imaging first photons emitted from said first imaging sheet using a detector system, wherein, resultant from transmission of the positively charged particles transmitting through said first imaging sheet, said first imaging sheet emits the first photons; positioning a second imaging sheet in the beam path between said first imaging sheet and the patient; and imaging second photons emitted from said second imaging sheet using said detector system, wherein, resultant from transmission of the positively charged particle transmitting through said second imaging sheet, said second imaging sheet emits the second photons; and further comprising the step of: verifying direction of the beam path against a radiation treatment plan using two signals from said detector system, said two signals comprising a first position signal representative of a first location of the first photons emitted from said first imaging sheet and a second position signal representative of a second location of the second photons emitted from the second imaging sheet.