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(a) Irradiation respiratory cycle (=T1) is the same as that for the planning respiratory cycle. The gating window for treatment planning is from t1 to t3 and from t4 to t5. Two PCR layers are present. (b) The irradiation respiratory cycle (=T2) is longer than that for the planning respiratory cycle (=T1). The gating window for the irradiation is from t1ʹ to t3ʹ and from t4ʹ to t7. PCR, phase-controlled rescanning.
