Contrast optimization for the detection of focal hepatic lesions by MR imaging at 1.5 T

The relative efficacies of different spin-echo pulse sequences at 1.5 T were evaluated in the detection of focal hepatic disease. Pulse sequences compared were spin-echo with a repetition time (TR) of 200 msec and echo time (TE) of 20 msec, with six excitations; TR = 300 msec, TE = 20 msec, with 16...

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Published inAmerican journal of roentgenology (1976) Vol. 149; no. 6; pp. 1155 - 1160
Main Authors Foley, WD, Kneeland, JB, Cates, JD, Kellman, GM, Lawson, TL, Middleton, WD, Hendrick, RE
Format Journal Article
LanguageEnglish
Published Leesburg, VA Am Roentgen Ray Soc 01.12.1987
American Roentgen Ray Society
Subjects
Biological and medical sciences
Cysts - diagnosis
Gastroenterology. Liver. Pancreas. Abdomen
Hemangioma - diagnosis
Humans
Image Enhancement - methods
Liver Diseases - diagnosis
Liver Neoplasms - diagnosis
Liver Neoplasms - secondary
Liver. Biliary tract. Portal circulation. Exocrine pancreas
Magnetic Resonance Imaging - methods
Medical sciences
Tumors
Focal lesion
Tumor
Diagnosis
Nuclear magnetic resonance imaging
Liver
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Summary:The relative efficacies of different spin-echo pulse sequences at 1.5 T were evaluated in the detection of focal hepatic disease. Pulse sequences compared were spin-echo with a repetition time (TR) of 200 msec and echo time (TE) of 20 msec, with six excitations; TR = 300 msec, TE = 20 msec, with 16 excitations (T1-weighted sequences); and a double spin-echo with TR = 2500 and TE = 25 and 70, with two excitations (proton-density-weighted and T2-weighted pulse sequences, respectively). Respiratory-motion compensation, which involved a recording of the phase-encoding gradients (Exorcist), was used for the last two sequences. Spin-echo with TR = 2500 msec and TE = 70 msec was superior in lesion detection and contrast-to-noise ratio. The proton-density-weighted and T2-weighted sequences with respiratory compensation produced better artifact suppression than did the short TR, short TE T1-weighted sequence with temporal averaging. In contradistinction to prior results at 0.6 T, T2-weighted pulse sequences appear superior to T1-weighted pulse sequences with multiple excitations for both lesion detection and artifact suppression at 1.5 T.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:0361-803X
1546-3141
DOI:10.2214/ajr.149.6.1155