A leg of a table includes a connecting portion, and an elongated supporting portion. The lead can be configured so that the lead heats local tissue less than about 10 degrees Celsius or does not heat local tissue when a patient is exposed to target RF frequencies at a peak input SAR of at least about 4 Wkg andor a whole body average SAR of at least about 2 Wkg. When the lock base is in the locked position and a force is applied on the spool through the webbing, rotation of the spool is permitted while rotation of the lock base is prevented, such that the first energy absorbing member absorbs a first energy and the second energy absorbing member is configured to absorb a second energy after a predetermined rotation of the spool.