8Clevert DA, D'Anastasi M, Jung EM. Contrast-enhanced ul- trasound and microcirculation: efficiency through dynamics- current developments[J]. Clin Hemorheol Mierocirc, 2013, 53 (1-2):171-186.
9Michallek FI, Dewey M. Fractal analysis in radiological and nuclear medicine perfusion imaging: a systematic review[J]. Eur Radiol, 2014, 24(1):60-69.