Double amputee Oscar Pistorius claims a new scientific investigation has produced 'completely different' results to those that saw him banned from competing against able-bodied athletes by the International Association of Athletics Federation.
The IAAF announced its decision in January after studying the findings of a two-day independent study in November 2007 which found that the South African's 'cheetah' blades gave him a clear advantage.
Last month Pistorius - nicknamed 'Blade Runner' - launched an appeal to the Court of Arbitration for Sport against the IAAF's ruling with the BBC reporting the decision is due on March 25.
The IAAF's ruling prompted the 21-year-old undergo fresh tests in the USA and Germany.
The results restored Pistorius' optimism that he may be able to run at the Beijing Olympics although he would have little time to achieve the qualifying time.
In the documentary 'The Fastest Man On No Legs', Pistorius said: "We've done tests last week in Houston, they re-did the tests they did in Germany and the results were completely different.
"We're very optimistic. I'm really excited for the outcome. I am still hoping that I can make the cut-off to qualify for the Olympic Games but time is tight and I only have until mid-June I think and I haven't had any able-bodied races."
Pistorius was banned after tests by Professor Peter Bruggemann, at the German Sports University, Cologne.
Bruggemann found that Pistorius' blades gave him a 'considerable advantage', adding that they allowed the athlete 'to run with his prosthetic blades at the same speed as the able-bodied sprinters with about 25 percent less energy expenditure'.
Elio Locatelli, the IAAF official who organised the testing insists the way Pistorius finishes his races is 'impossible'.
"I was a little suspicious about him in the 400m because he was finishing very quick." Locatelli said.
"A 400m runner cannot run the second part of the race faster than the first. It is quite impossible. From the 200m to the 300m and 400m, he can be compared to the world record holder."
Pistorius was 11 months old when his legs were amputated below the knee but only began running competitively on the carbon fibre blades four years ago against both able-bodied and disabled athletes.
He had immediate success, winning the 200m at the Athens Paralympic Games and bronze in the 100m and also holds the Paralympic world records at both distances as well as the 400m.
Pistorius finished second over 400m in a B race at the IAAF Golden League meeting in Rome last summer and also lined up against Olympic and world champion Jeremy Wariner in Sheffield.