Hajime Ichikawa

Learn More
OBJECTIVE The aim of this study was to characterize the optimal reconstruction parameters for ordered-subset expectation maximization (OSEM) with attenuation correction, scatter correction, and depth-dependent resolution recovery (OSEMACSCRR). We assessed the optimal parameters for OSEMACSCRR in an anthropomorphic torso phantom study, and evaluated the(More)
BACKGROUND Pulmonary hypertension (PH) is a progressive disease characterized by raised pulmonary vascular resistance, thought to be curable only through lung transplantation. Pathophysiologically, proliferation of pulmonary artery smooth muscle cells triggers pulmonary arterial stenosis and/or regurgitation, especially in advanced PH. METHODS AND RESULTS(More)
Electroretinographic studies were performed in three congenital tritanopic subjects in a single pedigree. The b-waves were recorded in the presence of white and intense yellow adaptation in response to 16 monochromatic light stimuli. Compared with the response of normal subjects, a marked reduction or a lack of the blue cone responses was clearly shown in(More)
Organic valve disease has been considered an absolute contraindication for acceptance as a donor heart. However, the severe shortage of donor hearts has prompted the use of marginally acceptable hearts to maximize the use of donor hearts. This report concerns a patient with repeated left ventricular assist system complications who underwent successful heart(More)
OBJECTIVES Whereas surgical outcomes of congenital heart surgery have improved during the past two decades, there are still measurable postoperative mortalities in this field. This study is aimed at evaluating the current situation of mortality following congenital heart surgery. METHODS Data on all registered 28 810 patients in The Japan Congenital(More)
We investigated artifacts due to late-arriving contrast medium (CM) during C-arm cone-beam computed tomography. We scanned a phantom filled with water or with 100, 50, or 5% v/v concentrations of CM and then virtually produced CM-delayed projection data by partially replacing the projection images. Artifacts as a function of concentration, percentage of(More)
OBJECTIVE Aortic regurgitation (AR) in the tetralogy of Fallot (TOF) is not frequent, but when present it impacts significantly on surgical management. Furthermore, the incidence of late AR development has been increasing, along with surgical interest in current practices. METHODS Pre- and post-operative studies on 427 patients (TOF, 374; TOF/PA (TOF with(More)
OBJECTIVES Small pulmonary allografts are difficult to obtain, thus we now use a tailor-made right ventricle to pulmonary artery (RV-PA) conduit for the Ross procedure, consisting of a fresh non-treated autologous pericardial (AP) patch for the posterior wall and expanded polytetrafluoroethylene (ePTFE) monocusp patch for the anterior wall. Long-term(More)
We propose a new dew condensation water prevention system (DCPS) of the oxygenator for an extracorporeal life support (ECLS) system. The preventive properties were evaluated in vitro experiments. The experimental setup consists of DCPS and ECLS system. The DCPS features a convective air warming system with a square vinyl bag covering the oxygenator. Dew(More)
  • 1