The system and method includes a shape capable of detecting device 116 having at least one optical fiber 118 there. The source positioning module 124 receives an optical signal from at least one optical fiber is in the structure, and decodes the optical signals, is configured to provide the motion information of the therapeutic radiation source within said device that. Dose determination module 130 is configured to provide one or more of the time bins that shows the total treatment time. For each time bin, the dose determination module is configured to use the motion information of the therapeutic radiation source, to determine the dose target area to be treated is received. The dose determination module is further for each of the one or more of the time bins, by combining the dose of the target area is received, configured to determine the total dose of the target area is received.
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