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Evaluation of femoral perfusion in a non‐traumatic rabbit osteonecrosis model with T2*‐weighted dynamic MRI
Author(s) -
Tsuji Takashi,
Sugano Nobuhiko,
Sakai Takashi,
Yoshikawa Hideki
Publication year - 2003
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1016/s0736-0266(02)00144-4
Subject(s) - medicine , extravasation , magnetic resonance imaging , perfusion , dynamic contrast enhanced mri , lesion , nuclear medicine , dynamic contrast , radiology , pathology
We evaluated femoral perfusion in a non‐traumatic rabbit serum sickness osteonecrosis (ON) model, using serial repetitive T2*‐weighted (T2*W) dynamic magnetic resonance imaging (MRI) and investigated prediction of ON occurrence in early stages, comparing T2*W dynamic MRI with non‐enhanced (T2‐, T1‐ and fat suppression T1‐weighted) and contrast‐enhanced MRI. Early microcirculatory injury or necrotic lesion was detected in 0% of femora (extravasation, 0/6) at 72 h, 33% (necrotic, 4/12) at 1 week and 100% (necrotic, 14/14) at 3 weeks using non‐enhanced MRI, and in 67% of femora (extravasation, 4/6) at 72 h, 58% (necrotic, 7/12) at 1 week and 100% (necrotic, 14/14) at 3 weeks using contrast‐enhanced MRI. In contrast, microcirculatory injury or necrotic lesion was detected in 83% of femora (extravasation, 5/6) at 72 h, 92% (necrotic, 11/12) at 1 week and 100% (necrotic, 14/14) at 3 weeks using T2*W dynamic MRI as no transient decrease or less marked transient decrease in signal intensity of regions of interest (ROIs), compared to normal femora, which showed a clear transient decrease in signal intensity of ROIs. These results indicate that T2*W dynamic MRI with optimal imaging parameters and a dose of contrast agent is the most sensitive of these three MRI methods and may be clinically useful for evaluating femoral perfusion in artery phase and predicting ON occurrence. © 2002 Orthopaedic Research Society. Published by Elsevier Science Ltd. All rights reserved.