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(a) Calculation of SCR for prostate (SCR Prostate), CTV (SCR CTV), and prostate plus SV (SCR SV). (b) Distribution of hydrogel spacer for patients 45 (group 1; SCR Prostate, SCR CTV, and SCR SV of 100%, 90.6%, and 66.9%, respectively) and 13 (group 2; SCR Prostate, SCR CTV, and SCR SV of 67.3%, 66.7%, and 62.8%, respectively).
