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Rapid, contrast-enhanced, diuretic magnetic resonance imaging of unilateral partial ureteral obstruction. An experimental study in micropigs.
Tzika, A A; Thurnher, S; Hricak, H; Price, D C; Arrive, L; Aboseif, S; Engelstad, B L; Rector, F C.
Afiliação
  • Tzika AA; Department of Radiology, University of California School of Medicine, San Francisco 94143.
Invest Radiol ; 24(1): 37-46, 1989 Jan.
Article em En | MEDLINE | ID: mdl-2917822
ABSTRACT
The value of rapid, contrast-enhanced, diuretic magnetic resonance (MR) imaging (using ferrioxamine B and furosemide) in demonstrating partial unilateral ureteral obstruction and the potential of such MR imaging in differentiating obstructive from nonobstructive hydronephrosis was assessed in six micropigs. MR imaging (0.35 Tesla, partial-flip technique with repetition time [TR] of 125 milliseconds, echo-delay time [TE] of 20 milliseconds, and flip angle of 70 degrees) was performed before, and at 5, 12, and 19 days after partial ureteral obstruction. Additionally, MR images were acquired 5, 12, and 19 days after release of obstruction. The diuretic was injected 10 minutes after the contrast medium. MR findings were correlated with results from nuclear scintigraphy (99mTc-DMSA uptake). MR images provided good morphologic detail from which renal size, parenchymal thickness, and degree of hydronephrosis could be determined. Contrast medium allowed assessment of cortical uptake and urinary excretion. The course of cortical signal enhancement best characterized the difference between obstructive and nonobstructive hydronephrosis. Normal kidneys and kidneys with nonobstructive hydronephrosis showed progressive decrease in cortical signal enhancement (-11.7% within 40 minutes) after furosemide injection. The kidneys with obstructive hydronephrosis demonstrated a plateau of signal enhancement without decrease (-0.7% within 40 minutes). These results demonstrate the utility of rapid contrast-enhancing, diuretic MR imaging in differentiating obstructive from nonobstructive hydronephrosis.
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Obstrução Ureteral / Imageamento por Ressonância Magnética / Compostos Férricos / Meios de Contraste / Desferroxamina / Furosemida / Hidronefrose Limite: Animals Idioma: En Revista: Invest Radiol Ano de publicação: 1989 Tipo de documento: Article
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Obstrução Ureteral / Imageamento por Ressonância Magnética / Compostos Férricos / Meios de Contraste / Desferroxamina / Furosemida / Hidronefrose Limite: Animals Idioma: En Revista: Invest Radiol Ano de publicação: 1989 Tipo de documento: Article