Tomohiro Namimoto

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PURPOSE To evaluate diffusion-weighted echo-planar magnetic resonance (MR) imaging for improving the specificity of characterization of liver tumors. MATERIALS AND METHODS Diffusion-weighted echo-planar imaging was performed with a 1.5-T whole-body imager with use of a body phased-array coil in 51 patients with 59 hepatic masses (41 malignant tumors, nine(More)
The purpose of this study was to determine the relationship between the apparent diffusion coefficient (ADC) and diffuse renal disease by diffusion-weighted echolanar magnetic resonance (MR) imaging (EPI). Thirty-four patients were examined with diffusion-weighted EPI. The average ADC values were 2.55 x 10(-3) mm2/sec for the cortex and 2.84 x 10(-3)(More)
OBJECTIVE We prospectively compared the detectability of hepatocellular carcinoma (HCC) arising in cirrhotic livers using dynamic gadolinium-enhanced fast low-angle shot (FLASH), ferumoxides-enhanced T2-weighted turbo spin-echo, and ferumoxides-enhanced T2*-weighted FLASH MR imaging. SUBJECTS AND METHODS Fifty-three patients with HCC (32 men and 21 women)(More)
OBJECTIVE Breath-hold MR urography using half-Fourier acquisition single-shot turbo spin-echo (HASTE) sequences was evaluated as a noninvasive alternative to excretory urography in healthy volunteers and in patients with disorders of the urinary tract. SUBJECTS AND METHODS Twenty healthy volunteers and 45 patients with disorders of the urinary tract(More)
The objective of our study was to compare diffusion-weighted imaging (DWI) alone and DWI combined with T2-weighted MRI for the differentiation of uterine sarcomas from benign leiomyomas. T2-weighted imaging and DWI were performed in 103 patients with 103 myometrial tumours, including 8 uterine sarcomas and 95 benign leiomyomas on 3-T MR imaging. The signal(More)
OBJECTIVE The value of a half-Fourier acquisition single-shot turbo spin-echo (HASTE) sequence, in which high-resolution heavily T2-weighted images can be obtained within 2 sec, was evaluated in the imaging of the fetus during the second or third trimester. MATERIALS AND METHODS Eighteen women with complicated pregnancies as revealed on a sonogram during(More)
PURPOSE To quantify fat content in adrenal lesions with double-echo chemical shift magnetic resonance (MR) imaging in a phantom study and to differentiate adrenal adenomas from other adrenal masses by assessing fat content in a clinical study. MATERIALS AND METHODS The study consisted of two parts: a phantom study and a clinical study. To explore the(More)
PURPOSE To determine whether diffusion-weighted echo-planar magnetic resonance (MR) imaging can help differentiate mucin-producing tumors of the pancreas from other cystic lesions. MATERIALS AND METHODS Diffusion-weighted echo-planar 1.5-T MR imaging was performed in patients with mucin-producing tumor (n = 15), pseudocyst (n = 15), or serous microcystic(More)
OBJECTIVE To assess the clinical negative predictive value (NPV) of multiparametric MRI (mp-MRI) for prostate cancer in a 5-year follow-up. MATERIALS AND METHODS One hundred ninety-three men suspected of harboring prostate cancer with negative MRI findings were included. Patients with positive transrectal ultrasound (TRUS)-guided biopsy findings were(More)
The clinical significance of magnetic resonance cholangiopancreatography (MRCP) using half-Fourier acquisition single-shot turbo spin-echo (HASTE) in the evaluation of congenital anomalies of pancreaticobiliary tract was demonstrated in 56 patients (man: 31, women: 25; age: 0-60 years old, mean 15 years old) with suspected congenital anomalies of(More)