Bubble detection apparatus and method for a liquid dispensing system includes temperature compensation for increasing accuracy of the bubble detection as temperature of the liquid varies. The key to improving the quality of radiosurgery is to increase the dose falloff rate from high dose regions inside the tumor to low dose regions of nearby healthy tissues and structures. The audio jack includes a left track segment, a micro segment, a right track segment, and a ground segment, which are correspondingly coupled to a first data pin, a second data pin, a power pin and a ground pin of the first USB port. The user may then precisely select trigger and field parameters used for identifying index values in such a line data document for purposes of indexing and archiving.