Alterations in T1 of normal and reperfused infarcted myocardium after Gd-BOPTA versus GD-DTPA on inversion recovery EPI.
This study tested whether Gd-BOPTA/Dimeg or Gd-DTPA exerts greater relaxation enhancement for blood and reperfused infarcted myocardium. Relaxivity of Gd-BOPTA is increased by weak binding to serum albumin. Thirty-six rats were subjected to reperfused infarction before contrast (doses = 0.05, 0.1, and 0.2 mmol/kg). delta R1 was repeatedly measured over 30 min. Gd-BOPTA caused greater delta R1 for blood and myocardium than did Gd-DTPA; clearance of both agents from normal- and infarcted myocardium was similar to blood clearance; plots of delta R1 myocardium/delta R1 blood showed equilibrium phase contrast distribution. Fractional contrast agent distribution volumes were approximately 0.24 for both agents in normal myocardium, 0.98 and 1.6 for Gd-DTPA and Gd-BOPTA, respectively, in reperfused infarction. The high value for Gd-BOPTPA was ascribed to greater relaxivity in infarction versus blood. It was concluded that Gd-BOPTA/Dimeg causes a greater delta R1 than Gd-DTPA in regions which contain serum albumin.
Wendland
M F
MF
Department of Radiology, University of California, San Francisco 94143-0628, USA.
Saeed
M
M
Lauerma
K
K
Derugin
N
N
Mintorovitch
J
J
Cavagna
F M
FM
Higgins
C B
CB
D000818:Animals; D003287:Contrast Media / Q000008:administration & dosage*; D019786:Gadolinium DTPA; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008536:Meglumine / Q000008:administration & dosage / Q000031:analogs & derivatives*; D009203:Myocardial Infarction / Q000175:diagnosis*; D015425:Myocardial Reperfusion; D009206:Myocardium / Q000473:pathology*; D009942:Organometallic Compounds / Q000008:administration & dosage*; D004369:Pentetic Acid / Q000008:administration & dosage / Q000031:analogs & derivatives*; D051381:Rats; D017207:Rats, Sprague-Dawley
D003287:Contrast Media; D009942:Organometallic Compounds; C064572:gadobenic acid; D008536:Meglumine; D004369:Pentetic Acid; D019786:Gadolinium DTPA