title: Imaging features of gray-scale and contrast-enhanced color Doppler US for the differentiation of transient renal arterial ischemia and arterial infarction.
abstract: OBJECTIVE
  To characterize the imaging features on gray-scale and contrast-enhanced color Doppler US images which differentiate renal ischemia from renal infarction.
  
  
  METHODS
  The segmental renal arteries of eight healthy rabbits were surgically ligated. In four of these rabbits, the ligated renal artery was released 60 minutes after arterial occlusion to cause transient ischemia. In the remaining four rabbits, the arterial ligation was retained to cause a permanent infarction. The gray-scale and contrast-enhanced color Doppler US imaging features of the involved renal parenchyma of both ischemia and infarction groups were compared with respect to the presence or absence of parenchymal swelling, echogenicity changes, tissue loss and perfusion defects.
  
  
  RESULTS
  Parenchyma swelling, echogenic changes, tissue loss and perfusion defects were found to be more extensive in the infarction than the ischemia group. The hyperechoic areas reperfused with blood flow recovered normal echogenicity and perfusion, whereas the hyperechoic areas without reperfusion became renal infarcts.
  
  
  CONCLUSIONS
  Gray-scale and contrast-enhanced color Doppler US showed that the hyperechoic areas with reperfusion may reverse to normal parenchyma and allow the differentiation of renal ischemia from renal infarction.
authors.affiliation: Department of Radiology, Seoul National University College of Medicine, Institute of Radiation Medicine, SNUMRC, Clinical Research Institute, Seoul National University Hospital, Seoul, Korea.
authors.forename: Byung Kwan
authors.initials: BK
authors.lastname: Park
authors.forename: Seung Hyup
authors.initials: SH
authors.lastname: Kim
authors.forename: Min Hoan
authors.initials: MH
authors.lastname: Moon
authors.forename: Sung Il
authors.initials: SI
authors.lastname: Jung
mesh_terms: D000818:Animals; D003287:Contrast Media; D003937:Diagnosis, Differential; D007089:Image Enhancement; D007238:Infarction / Q000000981:diagnostic imaging*; D007511:Ischemia / Q000000981:diagnostic imaging*; D007668:Kidney / Q000098:blood supply*; D008297:Male; D011817:Rabbits; D012077:Renal Artery; D018608:Ultrasonography, Doppler / Q000379:methods*
chemical_list: D003287:Contrast Media