Keywords: PCCA; phase-change contrast agent; US; ultrasound; MB; microbubble; PFC; perfluorocarbon; BP; boiling point; DFB; decafluorobutane; OFP; octafluoropropane; DDFP; dodecafluoropentane; MI; mechanical index; FR; folate receptor; IQR; interquartile range; SD;