title: Dynamic gadolinium-enhanced echo-planar MR imaging of the liver: effect of pulse sequence and dose on enhancement.
abstract: To develop guidelines for clinical magnetic resonance imaging of the liver, the authors undertook an animal study to investigate the effect of dose and pulse sequence on liver signal intensity in gadopentetate dimeglumine-enhanced echo-planar imaging. Serial imaging of the liver was performed in anesthetized rats after intravenous administration of five different doses (0.01, 0.05, 0.1, 0.2, and 0.5 mmol/kg) of contrast agent, with six different pulse sequences. The results show that gadopentetate dimeglumine-enhanced echo-planar images obtained during the perfusion phase can yield either positive (due to increased T1 relaxation rates) or negative (due to susceptibility-induced increased T2 relaxation rates) liver enhancement depending on choice of pulse sequence and dose. At the current clinically recommended dose of 0.1 mmol/kg, maximal liver signal enhancement was seen with a T1-weighted inversion-recovery sequence, while maximal liver signal diminution was seen with a T2*-weighted gradient-echo sequence. The authors conclude that gadopentetate dimeglumine-enhanced echo-planar imaging can provide T1, T2, and T2* contrast that may be exploited for both lesion detection and lesion characterization.
authors.affiliation: Department of Radiology, Massachusetts General Hospital, Boston 02114.
authors.forename: P
authors.initials: P
authors.lastname: Reimer
authors.forename: S
authors.initials: S
authors.lastname: Saini
authors.forename: K K
authors.initials: KK
authors.lastname: Kwong
authors.forename: M S
authors.initials: MS
authors.lastname: Cohen
authors.forename: R
authors.initials: R
authors.lastname: Weissleder
authors.forename: T J
authors.initials: TJ
authors.lastname: Brady
mesh_terms: D000818:Animals; D003287:Contrast Media / Q000008:administration & dosage*; D004305:Dose-Response Relationship, Drug; D004338:Drug Combinations; D017352:Echo-Planar Imaging / Q000379:methods*; D005682:Gadolinium / Q000008:administration & dosage; D019786:Gadolinium DTPA; D006168:Guinea Pigs; D007091:Image Processing, Computer-Assisted; D008099:Liver / Q000033:anatomy & histology*; D008297:Male; D008536:Meglumine / Q000008:administration & dosage; D009942:Organometallic Compounds / Q000008:administration & dosage; D004369:Pentetic Acid / Q000008:administration & dosage / Q000031:analogs & derivatives*; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D003287:Contrast Media; D004338:Drug Combinations; D009942:Organometallic Compounds; D008536:Meglumine; D004369:Pentetic Acid; D005682:Gadolinium; D019786:Gadolinium DTPA