diff --git a/IRaCIS.Core.Application/Service/ReadingCalculate/OCTCalculateService.cs b/IRaCIS.Core.Application/Service/ReadingCalculate/OCTCalculateService.cs
index ca81c1707..05006fd3e 100644
--- a/IRaCIS.Core.Application/Service/ReadingCalculate/OCTCalculateService.cs
+++ b/IRaCIS.Core.Application/Service/ReadingCalculate/OCTCalculateService.cs
@@ -1285,7 +1285,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
         public async Task<decimal?> GetMinFCT(ReadingCalculateDto inDto)
         {
             return inDto.QuestionInfo.Where(x => x.LesionType == LesionType.ROI).SelectMany(x => x.TableRowInfoList).SelectMany(x => x.TableQuestionList)
-             .Where(x => x.QuestionMark == QuestionMark.AvgFCT).Select(x => x.Answer.IsNullOrEmptyReturn0()).MinOrDefault();
+             .Where(x => x.QuestionMark == QuestionMark.AvgFCT).Select(x => x.Answer.IsNullOrEmptyReturn0()).Where(x => x != 0).MinOrDefault();
         }
 
         /// <summary>