AN MD80 FLC; ON THE TKOF ROLL ON RWY 18L; DOES NOT HEAR THE TWR CTLR'S CANCELLATION OF THEIR TKOF CLRNC DUE TO THE GAR OF AN ACFT ON RWY 13R AT DFW; TX.

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LOCATION: RWY 18L DFW; TKOF. WE WERE CLRED INTO POS AND HOLD RWY 18L AS ANOTHER MD80 WAS STARTING TKOF ROLL. WE WERE SUBSEQUENTLY CLRED FOR TKOF AS THE PRECEDING ACFT LIFTED OFF. AS WE COMPLETED THE CHKLIST ON THE RWY AND SET THE PWR FOR TKOF (THE NOSE LIGHTS ON; BEFORE TKOF CHKLIST COMPLETE; AUTOTHROTTLES ON; AND 80 KTS CALLOUTS); TWR MADE A COUPLE RADIO CALLS -- INCLUDING ONE REGARDING AN ACFT Z GOING AROUND FROM RWY 13R. BOTH THE CAPT AND I THOUGHT TWR WAS TALKING TO THE ACFT Y PRECEDING US OR TO TFC ON FINAL FOR RWY 18R AS WE COULD SEE BOTH THE ACFT OFF RWY 13R AND OUR PRECEDING TFC. I NEVER HEARD EITHER OUR CALL SIGN OR THE 'TKOF CLRNC CANCELED' PART OF THE XMISSION THAT TWR LATER INFORMED US WAS ISSUED. WE NEVER ACKNOWLEDGED THE CANCELLATION OF OUR TKOF CLRNC BECAUSE WE NEVER HEARD IT. I BELIEVE THAT PROBABLY THE 'AUTOTHROTTLE ON' CALLOUT OCCURRED IN THE COCKPIT AS TWR MADE THEIR RADIO XMISSION; CAUSING US TO ONLY HEAR THE END OF THE XMISSION WHICH WE ASSUMED WAS FOR ANOTHER ACFT. WE DIDN'T ACKNOWLEDGE THE CALL AND TWR MADE NO ATTEMPT TO REPEAT IT. TWR SUBSEQUENTLY ISSUED TKOF CLRNC AS WE CONTINUED TO ROLL (AT PROBABLY OVER 100 KTS; LESS THAN V1) WHICH I ACKNOWLEDGED BECAUSE I DIDN'T WANT TO BE IN A CONVERSATION WITH TWR IN SUCH A CRITICAL PHASE. AFTER WE LIFTED OFF AND CLEANED UP; TWR EXPLAINED THAT THEY HAD CANCELED OUR TKOF CLRNC AND SAID 'IT'S NO BIG DEAL NOW.' THERE WASN'T EVER A TFC CONFLICT WITH EITHER THE GAR ACFT OR OUR PRECEDING TFC AND THE REMAINDER OF THE FLT PROGRESSED NORMALLY. I'LL BE MORE ATTENTIVE TO THE RADIOS DURING TKOF AND CAREFUL OF WHEN AND WHERE THE VARIOUS REQUIRED CALLOUTS ARE MADE WITH REF TO RADIO TFC. THE BUSY ENVIRONMENT OF DFW AND THE SPD WITH WHICH SOME CTLRS ISSUE INSTRUCTIONS REQUIRE THAT WE DEPEND TO SOME EXTENT ON KNOWING WHAT TO EXPECT TO HEAR BEFORE THE INSTRUCTIONS ARE ISSUED. IN THIS CASE; THE VISUAL CUES AND TIME COMPRESSED NATURE OF THE TKOF SEQUENCE BETRAYED THAT EXPECTATION.