Echoplanar MR imaging of the liver in patients with focal hepatic lesions: quantitative analysis of images made with various pulse sequences

AJR. American Journal of Roentgenology
S SainiM S Cohen

Abstract

We undertook this study to evaluate pulse-sequence performance in terms of liver signal-to-noise ratio (SNR) and lesion-liver contrast-to-noise ratio (CNR) on T1- and T2-weighted echoplanar MR imaging. Forty-nine patients referred for MR imaging of the liver were examined at 1.5 T with echoplanar MR imaging using spin-echo, inversion-recovery, and gradient-echo pulse sequences. T2-weighted spin-echo (TE = 25, 50, 100, and 150 msec), T1-weighted inversion-recovery (T1 = 100, 380, 600, and 800 msec), and T2*-weighted gradient-echo (TE = 20 msec) images were acquired after one excitation (TR = infinite), using a 128 x 128 data matrix. T2-weighted spin-echo (TE = 20, 50, 100, and 150 msec) images were also obtained with two excitations (TR = 6 sec), resulting in a 128 x 256 data matrix. Signal intensity measurements were made to calculate liver SNR and lesion-liver CNR. Single-excitation, T2-weighted, spin-echo images at a minimum TE of 25 msec provided the highest liver SNR (p < .05). Single-excitation, T2-weighted, spin-echo images at TEs of 50 and 100 msec, and T1-weighted inversion-recovery images at Tls of 100 and 380 msec provided the highest lesion-liver CNR (p < .05). However, the latter two pulse sequences had considerably...Continue Reading

Citations

Apr 30, 1998·Journal of Magnetic Resonance Imaging : JMRI·Y YamashitaM Takahashi
Jul 10, 1999·European Journal of Radiology·T Ichikawa, T Araki
Jun 18, 1999·Magnetic Resonance Imaging·F JafariA A Khodadoust
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Mar 30, 2000·Computerized Medical Imaging and Graphics : the Official Journal of the Computerized Medical Imaging Society·Y AbeM Takahashi
Mar 27, 2001·AJR. American Journal of Roentgenology·R TelloE K Yucel
Jul 1, 1996·Journal of Magnetic Resonance Imaging : JMRI·R C SemelkaG A Laub
Apr 1, 1998·Radiologic Clinics of North America·E S Siegelman, E K Outwater

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