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The TOTEM experiment at the LHC is equipped with near beam movable devices --called Roman Pots (RP) -- which detect protons scattered at the interactionpoint (IP5) arriving to the detectors through the magnet lattice of the LHC.Proton kinematics at IP5 is reconstructed from positions and angles measured bythe RP detectors, on the basis of the transport matrix between IP5 and the RPlocations. The precision of optics determination is therefore of the keyimportance for the experiment. TOTEM developed a novel method of machine opticsdetermination making use of angle-position distributions of elasticallyscattered protons observed in the RP detectors together with the data retrievedfrom several machine databases. The method has been successfully applied to thedata samples registered in 2010 and 2011. The studies show that the transportmatrix could be estimated with a precision better than 1%.

LHC Optics Determination with Proton Tracks Measured in the Roman Pot Detectors of the TOTEM Experiment