How can i read the field name in the internal table

Hi friends
i want to read the internal table filed name.
my requirement is like this:
data: begin of t_header occurs 0,
       extno(12),
       priotiy(5),
       ecnumber(10).
      end of t_header.
loop at t_header.
if the field name is priority i want to write some other
logic here.....
endloop.
Please tell me how can i do this.

data: wf_fld_cat type slis_t_fieldcat_alv .
data: wf_repid like sy-repid .
data: int_tab_name type slis_tabname .
move: sy-repid to wf_repid  ,
        'INT_OUTPUT' to int_tab_name .
  call function 'REUSE_ALV_FIELDCATALOG_MERGE'
   exporting
     i_program_name              = wf_repid
     i_internal_tabname          = int_tab_name
  I_STRUCTURE_NAME             =
  I_CLIENT_NEVER_DISPLAY       = 'X'
    i_inclname                   = wf_repid
    i_bypassing_buffer           = 'X'
  I_BUFFER_ACTIVE              =
    changing
      ct_fieldcat                  = wf_fld_cat[]
   exceptions
     inconsistent_interface       = 1
     program_error                = 2
     others                       = 3
  if sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  endif.
wf_fld_cat[] will hold the itab definition.
Regards
Raja

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