A system for compensating for a kickback voltage for a common electrode of a LCD device having a gate line where the gate signal is applied from a first end to a second. The arterial pressure is measured in the arterial branch and the venous pressure is measured in the venous branch, and the determination is made of whether or not decreases of the arterial pressures and venous pressures are occurring during the dialysis treatment in normal conditions. The system also includes a sensor arranged to detect a scattered beam reflected from at least one anomaly associated with the sample while the sample is undergoing chemical mechanical polishing, the scattered beam being in response to the incident beam.