释放TMemoryStream不会导致内存泄漏吗?

我将TWebModule与Apache一起使用。我有内存泄漏的问题。在下面的代码中没有释放

procedure TWebModule1.WebModule1WebActionItem8Action(Sender: TObject;
    Request: TWebRequest; Response: TWebResponse; var Handled: Boolean);
  var
    RecNo: Integer;
    ImageStream: TmemoryStream;
  begin
    RecNo := StrToInt(Request.QueryFields.Values['RecNo']);
    Master.MoveBy(RecNo - Master.RecNo); // go to right record
    ImageStream := TMemoryStream.Create;
    with TGraphicField.Create(Master) do
    try
      FieldName := 'Graphic';
      SaveToStream(ImageStream)
    finally
      Free
    end;
    ImageStream.Position := 0; // reset ImageStream
    Response.ContentType := 'image/jpg';
    Response.ContentStream := ImageStream;
    Response.SendResponse
  end;