It may sound irrrational, but imodern scanners are equiped with double sampling capacity of what is needed. Normally, half the avaliable bandwidth is not intended for anything but oversampling since digital filtering is cheaper than implementing the analog filters needed for saving sampling bandwith. Even though some of this bandwith is not useful due to filter effects, most is. Sixty EEG channels, for example, can easily be measured on a Siemens Trio, even when doing parallel imaging EPI at full speeed.