Perfusion-weighted magnetic resonance imaging for monitoring vascularization in tissue-engineered bone in rhesuses / 南方医科大学学报
Journal of Southern Medical University
; (12): 931-935, 2006.
Artigo
em Chinês
| WPRIM (Pacífico Ocidental)
| ID: wpr-282882
Biblioteca responsável:
WPRO
ABSTRACT
<p><b>OBJECTIVE</b>To assess the value of perfusion-weighted magnetic resonance (MR) imaging (PWMRI) in monitoring vascularization in tissue-engineered bone graft.</p><p><b>METHODS</b>Tibial diaphyseal defect of 20 mm was induced in 25 lower limbs of 13 rhesuses and fixed with an AO reconstruction plate with 7 holes. The monkeys were randomized into 5 groups according to the materials used for defect filling group A, with beta-tricalcium phosphate (beta-TCP), bone marrow stromal cells (BMSCs) and blood vessel bundles; group B, with beta-TCP and blood vessel bundles; group C, with beta-TCP and BMSCs; group D, with beta-TCP, and group E without filling. PWMRI, X-ray, and radionuclide imaging were carried out at weeks 4, 8, 12 postoperatively. The maximum slope rates of the single intensity-time curve (SS(max)) and the baseline values (SI(baseline)) on the same time points were calculated. Transmittances on the X-ray films and isotope counts in the region of interest (ROI) were assessed and calculated.</p><p><b>RESULTS</b>Compared with other groups, group A showed the highest SS(max) at weeks 4, 8, and 12 postoperatively, and its SS(max) at week 8 was significantly higher than that at week 4 (P=0.003). The SS(max) was positively related to isotope counts in ROI at week 8 after operation (r(s)=0.899, P=0.038), and inversely related to transmittance on X-ray films at week 12 (r(s)=-0.892, P=0.042).</p><p><b>CONCLUSION</b>The SS(max) of the single intensity-time curve can accurately reflect the vascularization of the tissue-engineered bone graft, and PWMRI allows sensitive, quantitative, noninvasive and radiation-free vascularization monitoring.</p>
Texto completo:
Disponível
Base de dados:
WPRIM (Pacífico Ocidental)
Assunto principal:
Fisiologia
/
Cirurgia Geral
/
Tíbia
/
Ferimentos e Lesões
/
Fosfatos de Cálcio
/
Distribuição Aleatória
/
Química
/
Transplante de Medula Óssea
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Angiografia por Ressonância Magnética
/
Substitutos Ósseos
Limite:
Animais
Idioma:
Chinês
Revista:
Journal of Southern Medical University
Ano de publicação:
2006
Tipo de documento:
Artigo