ABORTED TKOF AFTER LOSS OF ACCELERATION. RWY EXCURSION.

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PREFLT; PUSHBACK; AND TAXI WERE ALL NORMAL. RECEIVED TGT WARNING ON RAMP PRIOR TO STARTING OF #1 ENG. ENG INDICATIONS REMAINED NORMAL. I ELECTED TO CONDUCT A FULL- RATED TKOF BECAUSE OF THE TEMP ON THE FIELD. TKOF ROLL ON 18L PROCEEDED NORMALLY THROUGH THE FO'S SOFT V1 CALL AT 127 KTS IAS. UPON HEARING THE CALL; I OBSERVED THE IAS INDICATOR CONTINUE TO CLB AS HIGH AS 129 OR 130 KTS (ACTUAL V1 WAS 132 KTS IAS). IAS THEN BECAME MOMENTARILY STAGNANT; FOLLOWING WHICH IT BEGAN TO DECREASE. AS THIS OCCURRED; I FELT A LOSS OF ACCELERATION. UPON SEEING THE IAS GO AS LOW AS 122 KTS; I DETERMINED THAT IT WOULD NOT BE PRUDENT TO CONTINUE THE TKOF. THEREFORE; I ELECTED TO ABORT THE TKOF. THE ACFT DID NOT REACH V1; VR; OR V2. THE ACFT DID NOT ROTATE. UPON CALLING 'REJECT;' I APPLIED MAX BRAKING; CLOSED THE THROTTLES AND ACTIVATED LIFT DUMPERS AND SPD BRAKE. THE FO ADVISED THE TWR WE WERE ABORTING THE TKOF. THE ACFT BRAKING SYS APPEARED TO OPERATE NORMALLY. THE ACFT CAME TO A REST AT THE APCH END OF 36R. THE NOSE WHEEL AND L MAIN GEAR WERE SITUATED OFF THE PAVEMENT; IN A GRASSY AREA. THE R MAIN GEAR REMAINED ON THE PAVEMENT. I ELECTED NOT TO EVAC THE ACFT BECAUSE OF THE ABSENCE OF FIRE OR ANY OTHER IMMINENT DANGERS; AND THE POTENTIAL FOR INJURY SHOULD PAX BEGIN TO ROAM ABOUT THE FIELD. INSTEAD; I ADVISED BOTH THE TWR AND THE COMPANY OF OUR SITUATION AND REQUESTED ASSISTANCE. THE PAX REMAINED ON THE ACFT UNTIL VANS ARRIVED TO TRANSPORT THEM BACK TO THE TERMINAL. SUPPLEMENTAL INFO FROM ACN 207461: MY PERCEPTIONS ARE THUS: THAT THE CAPT MADE THE PROPER DECISION TO ABORT THE TKOF WHEN IT WAS APPARENT THAT ACCELERATION TO V1 AND BEYOND WAS UNLIKELY AS THE AIRSPD BEGAN TO DROP. WE WERE LEGAL FOR THE TKOF ON RWY 18L ACCORDING TO CURRENT WT AND BAL AND ARPT ANALYSIS. THIS LEAVES AT LEAST 400 FT REMAINING 'TILL RWY'S END ON ACCELERATE-STOP DISTANCE CHARTS IF TKOF IS ABORTED PRIOR TO V1 (132 KTS IAS FOR OUR WT). THIS DID NOT HAPPEN; AND I DO NOT KNOW WHY BECAUSE THE CAPT'S REJECT PROC APPEARED BOTH TIMELY AND FLAWLESS IN EXECUTION. I HAVE NO THOUGHTS OR CONJECTURE BEYOND THIS. NO INJURIES WERE RPTED AND THE ACFT WAS UNDAMAGED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE TGT WARNING ON RAMP WAS A NORMAL ANOMALY WITH THIS ACFT AND RPTR FO FELT IT HAD NO BEARING ON EVENT. ACR; ALPA; AND NTSB WERE INVOLVED IN INVESTIGATION. AN ENG STATIC RUN WAS PERFORMED; WITH ENGS BOROSCOPED. NO PROBLEMS. UPON QUESTIONING BY FAA; CREW STATED THEY FELT THIS WAS ANYTHING BUT AN ENG THRUST PROBLEM. THE AGENCY WANTED TO FIND FAULT REF REJECTING PAST V1; BUT UPON PULLING THE FLT RECORDER AND VERIFYING INFO REF AIRSPDS AND ACFT PERFORMANCE; THE ISSUE WAS DROPPED. ACFT IS ASSUMED TO HAVE REACHED ABOUT 137 KTS PRIOR TO ABORT ATTEMPT. 1 INTERESTING ASPECT IS THE MENTION OF THE MLG LNDG ON THE XING RWY JUST PRIOR TO THEIR TKOF ROLL. RPTR FELT THERE MAY HAVE BEEN A DEEPER ASSOCIATION WITH THAT THAN THOUGHT PREVIOUSLY. CREW WERE OFF FLT STATUS FOR A TIME DURING THE INVESTIGATION AND ARE NOW BACK ON THE LINE. NO PRIME REASON HAS BEEN ISSUED AS MAIN CAUSE OF ACFT INCIDENT.