Shinji Koike

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OBJECTIVE The aim of this study was to evaluate the degree of hepatic enhancement and image quality in patients with cirrhosis or chronic hepatitis who underwent multiphasic contrast-enhanced dynamic imaging on MDCT at least twice using standard (300 mg I/mL) and higher (370 mg I/mL) iodine concentrations in contrast medium during follow-up periods. (More)
PURPOSE To evaluate the frequency and clinical importance of small (<or=2 cm) early-enhancing hepatic lesions in cirrhotic liver disease with serial multiphasic contrast material-enhanced dynamic magnetic resonance (MR) imaging. MATERIALS AND METHODS The study population included 208 patients with cirrhosis (n = 162) or chronic hepatitis (n = 46) who(More)
PURPOSE To evaluate the additive value of breath-hold, multisection fluid-attenuated inversion-recovery (FLAIR) magnetic resonance imaging (MRI) using half-Fourier acquisition single-shot turbo-spin-echo (HASTE) sequence as supplements to moderately and heavily T2-weighted fast-spin-echo (FSE) sequences in differentiating hepatic cyst from hemangioma. (More)
OBJECTIVE The purpose of this study was to assess the value of multiarterial phase contrast-enhanced dynamic MRI of the whole liver obtained during a single breath-hold for small early enhancing hepatic lesions in patients with cirrhosis or chronic hepatitis, emphasizing the distinction between hypervascular hepatocellular carcinomas and pseudolesions. (More)
PURPOSE To evaluate the influence of food intake on portal flow using unenhanced magnetic resonance imaging (MRI). MATERIALS AND METHODS The study population included 29 healthy subjects. A selective inversion recovery tagging pulse was used on the superior mesenteric vein (SMV) and splenic vein (SpV) to study the correlation of tagged blood in the portal(More)
OBJECTIVE The purpose of this study was to evaluate the intraportal blood flow distribution from splenic and superior mesenteric veins with an unenhanced MR angiographic technique using single breath-hold ECG-triggered three-dimensional (3D) half-Fourier fast spin-echo sequence and selective inversion-recovery tagging pulse. SUBJECTS AND METHODS Seventeen(More)
PURPOSE To determine the frequency of occurrence of the right posterior hepatic notch sign at MR imaging in patients with cirrhosis, and to assess its diagnostic capability of this sign as a simple diagnostic MR finding of cirrhosis. MATERIALS AND METHODS This study population included 330 patients with pathologically proved cirrhosis (N = 202) or without(More)
OBJECTIVE Eighteen healthy persons underwent unenhanced MR angiography with a breath-hold ECG-synchronized 3D half-Fourier fast spin-echo technique to evaluate the visibility of the portal vein and its branches. CONCLUSION Our results indicated that unenhanced MR angiography with a singlebreath-hold ECG-synchronized 3D half-Fourier fast spin-echo sequence(More)
OBJECTIVE To compare the image quality and visualization obtained in MR cholangiopancreatography (MRCP) using different high-field strength (1.0 vs. 1.5 Tesla) MR units and to assess the effect of field strength on MRCP. MATERIALS AND METHODS This study population included 10 healthy volunteers and 37 patients suspected of having pancreatobiliary(More)
Katsuyoshi ITO1, Donald MITCHELL2, Myeong-Jin KIM3, Shinji KOIKE4, Keiko KISHIMOTO5, Nobuhiko OGASAWARA6, Kazuyoshi SUGA7, Naofumi MATSUNAGA7 1Yamaguchi University School of Medicine, 1-1-1 Minami-kogushi, Ube, Yamaguchi Japan; 2Thomas Jefferson University, 132 South 10th Street, Philadelphia, PA ; 3Yonsei University College of Medicine, Department of(More)