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.