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OBJECTIVE Our objective was to determine the utility of 3D T2 MR cholangiography (MRC) for biliary visualization and predicting the number of ductal orifices during right lobe harvesting for ductal anastomosis in liver donors for right lobe transplantation. MATERIALS AND METHODS This study was composed of 33 donors who underwent right lobectomy for(More)
To evaluate the utility of perfusion MRI as a potential biomarker for predicting response to chemoradiotherapy (CRT) in locally advanced rectal cancer. Thirty-nine patients with primary rectal carcinoma who were scheduled for preoperative CRT were prospectively recruited. Perfusion MRI was performed with a 3.0-T MRI system in all patients before therapy, at(More)
PURPOSE To compare diffusion-weighted imaging (DWI) and magnetic resonance (MR) volumetry for predicting treatment outcomes of locally advanced rectal cancers with preoperative chemoradiotherapy (CRT). MATERIALS AND METHODS This prospective study was approved by our Institutional Review Board. Thirty-four patients underwent three MR examinations: pre-CRT(More)
To determine whether magnetic resonance imaging (MRI)-detected extramural vascular invasion (EMVI) could predict synchronous distant metastases in rectal cancer. Patients who underwent rectal MRI between July 2011 and December 2012 were screened. This study included 447 patients with pathologically confirmed rectal adenocarcinoma who had undergone MRI(More)
OBJECTIVES To formulate an iodine-based contrast agent with an oil-in-water emulsion and to evaluate the feasibility of the agent for use as an interstitial computed tomographic (CT) lymphographic agent in a normal rat model. MATERIALS AND METHODS The effect of iodized oil (lipiodol) content and the type of surfactant/cosurfactant on the resultant(More)
OBJECTIVE To determine whether quantitative perfusion parameters of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) correlate with immunohistochemical markers of angiogenesis in rectal cancer. MATERIALS AND METHODS Preoperative DCE-MRI was performed in 63 patients with rectal adenocarcinoma. Transendothelial volume transfer (K(trans) ) and(More)
OBJECTIVE Colorectal polyps can be missed even during a meticulous colonoscopy by an experienced colonoscopist. The aim of this study was to investigate patient-, procedure-, and polyp-related factors affecting the miss rate of polyps on colonoscopy. MATERIAL AND METHODS From March 2001 to February 2006, a total of 285 patients undergoing screening(More)
OBJECTIVES The mixture-of-experts (ME) network uses a modular type of neural network architecture optimized for supervised learning. This model has been applied to a variety of areas related to pattern classification and regression. In this research, we applied a ME model to classify hidden subgroups and test its significance by measuring the stiffness of(More)
OBJECTIVES This study demonstrates the feasibility of using a modified mixture of experts (ME) model with repeated measured tumoural K(trans) value to perform an automatic diagnosis of responder based on perfusion magnetic resonance imaging (MRI) of rectal cancer. METHODS The data used in this study was obtained from 39 patients with primary rectal(More)
PURPOSE Rectal cancer patients achieving pCR are known to have an excellent prognosis, yet no widely accepted consensus on risk stratification and post-operative management (e.g., adjuvant therapy) has been established. This study aimed to identify magnetic resonance imaging (MRI) high-risk factors for tumor relapse in pathological complete remission (pCR)(More)