Koichi Hayano

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OBJECTIVE. The objective of our study was to compare the performance of three hybrid iterative reconstruction techniques (IRTs) (ASiR, iDose4, SAFIRE) and their respective strengths for image noise reduction on low-dose CT examinations using filtered back projection (FBP) as the standard reference. Also, we compared the performance of these three hybrid(More)
PURPOSE The ability to evaluate clinicopathologic features and prognosis before surgery by contrast-enhanced CT would be valuable for managing rectal cancer. This study was designed to evaluate the clinical usefulness of perfusion CT in patients with rectal cancer before surgery. METHODS Forty-four consecutive patients (27 men, 17 women; median age, 63.6(More)
Proteolytic bacteria in paddy field soils under rice cultivation were characterized and enumerated using azocoll agar plates. Bacillus spp. were the proteolytic bacteria that were most frequently present, comprising 59% of the isolates. They were always the numerically dominant proteolytic bacteria isolated from three kinds of fertilizer treatments (yearly(More)
BACKGROUND/PURPOSE The aim of this study was to evaluate the clinical usefulness of diffusion-weighted magnetic resonance imaging (DWI) in patients with pancreatic cancer by comparing the apparent diffusion coefficient (ADC) value with clinicopathologic features. METHODS Twenty-two consecutive patients (12 men, 10 women; mean age 64.4 years) with(More)
The major extracellular endopeptidase from Bacillus subtilis PF212 (isolated from paddy field soil) and B. subtilis CF80 (isolated from upland field soil) belongs to the group of serine proteases produced by Bacillus spp. known as subtilisins (optimum pH 7.0, optimum temperature 60 degrees C, and molecular mass 28 kDa). The NH2-terminal amino acid sequence(More)
OBJECTIVE The purpose of this study was to evaluate the response of biliary tract cancer treated with multidrug chemotherapy using FDG PET in comparison with morphologic and density changes. MATERIALS AND METHODS In this phase II clinical trial, 28 patients with unresectable or metastatic biliary tract cancers treated with gemcitabine and oxaliplatin(More)
The ability to predict the response to chemoradiation therapy (CRT) by contrast-enhanced CT would be valuable for managing esophageal squamous cell carcinoma. The purpose of this study was to evaluate the usefulness of Perfusion CT to predict the response to CRT in patients with esophageal squamous cell carcinoma. Thirty-one consecutive patients with(More)
Reports suggest that hepatic blood flow may have an association with cancer progression. The aim of the present study was to evaluate whether the hepatic blood flow measured by CT perfusion (CTP) may identify patients at high‑risk for postoperative recurrence of esophageal squamous cell carcinoma (ESCC). Prior to surgery, hepatic CTP images were obtained(More)
BACKGROUND/AIMS Intratumoral hemodynamics or tumor perfusion is useful in understanding the pathological background of the cancer. A parameter for a non-invasive, preoperative assessment of tumor perfusion has yet to be developed. METHODS The study included 50 patients who underwent surgery for gastric cancer. Perfusion computed tomography (P-CT) was(More)