%0 Journal Article %J Biomedical Microdevices %D 2008 %T Power density requirement of a 4 MHz micro-ultrasonic transducer for sonodynamic therapy %A Siu, T %A Rohling, R %A Chiao, M %P 89--97 %U http://dx.doi.org/10.1007/s10544-007-9113-z %V 10 %8 Feb %9 article