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[en] Primary progressive aphasia (PPA) is a heterogenous neurodegenerative disorder characterized by declining language and speech ability. Various underlying neuropathologies can induce PPA, and the disorder is divided into three subtypes—progressive non-fluent aphasia, semantic variant aphasia, and logopenic aphasia—according to clinical features. Accurate disease classification and prediction of underlying diseases are necessary for appropriate treatment, but proper use of imaging tests is important because clinical information alone often makes it difficult to make accurate decisions. Because there is a characteristic metabolic pattern according to the subtypes, F-18 fluorodeoxyglucose positron emission tomography (PET) can indicate subtype classification. In addition, PET studies for imaging amyloid or dopamine transporters play an important role in demonstrating underlying disease. The present case showed that PET imaging studies are useful in diagnosis and could be used as a biomarker in PPA
[en] Spontaneous regression of hepatocellular carcinoma after liver biopsy has not been reported in the English literature. Herein, we present a case of partial spontaneous regression of hepatocellular carcinoma after ultrasound guided liver biopsy in a 64-year-old female. During 28 months, the tumor, which had been shrinking, showed no interval change. However, after 28 months, tumor showed regrowth, which led to a segmentectomy.
[en] Extravasation of shoulder joint fluid into the surrounding muscles during shoulder arthroscopic surgery is common and inevitable. Here, we report a case of massive extravasation of shoulder joint fluid leading to mediastinal and retrotracheal effusion after arthroscopic shoulder surgery. We will discuss the anatomical basis of fluid leakage from the shoulder to the mediastinum and to the deep neck on CT.
[en] Treatment of acute cholecystitis with gallbladder perforation remains controversial. We aimed to determine the feasibility of percutaneous cholecystostomy (PC) in these patients. We retrospectively reviewed patients who had acute cholecystitis with gallbladder perforation at a single institution. Group 1 (n = 27; M:F = 18:9; mean age, 69.9 years) consisted of patients who received PC followed by cholecystectomy, and group 2 (n = 16; M:F = 8:8; mean age 57.1 years) consisted of patients who were treated with cholecystectomy only. Preoperative details, including sex, age, underlying medical history, signs of systemic inflammatory response syndrome (SIRS), laboratory findings, body mass index, presence of gallstone, and type of perforation; treatment-related variables, including laparoscopic or open cholecystectomy, conversion to laparotomy, blood loss, surgical time and anesthesia time; and outcome, including postoperative complications and hospital stay were analyzed. There was no significant difference in preoperative details, treatment-related variables, postoperative complications, and postoperative hospital stay. However, preoperative hospital stay (median, 14 days vs. 8 days; p < 0.05) and total hospital stay (median, 22 days vs. 14.5 days; p < 0.05) were significantly longer in group 1 than in group 2. The preferred treatment of acute cholecystitis with gallbladder perforation might be cholecystectomy without preoperative PC; however, preoperative PC can be a safe, optional treatment in elderly patients with signs of SIRS
[en] A 24-year-old man presented with dyspnea on exertion and intermittent blood-tinged sputum. He was diagnosed with aberrant systemic arterial supply to the normal lung (ASANL) based on the results of imaging studies. The patient was successfully treated with transarterial embolization using coils and a vascular plug and his symptoms disappeared during the follow-up. Herein, we reported the imaging findings of ASANL, differential diagnoses, and its treatment options. In addition, we reviewed the relevant literature
[en] A microplasma jet with a capillary electrode working at atmospheric pressure is developed to create nonthermal plasma. This jet can be operated at an excitation frequency either in several tens of kilohertz ac range (or pulsed voltage with a repetition rate of kilohertz range) or in radio-frequency range. The working gas, helium or argon, and the additive gas, oxygen, are fed into the plasma jet. The discharge has been characterized by optical emission spectroscopy. The electrical property of the discharge has been studied by means of voltage and current probes. The dynamic nature of the plume is investigated by using intensified charged coupled device camera. The electron temperature is estimated from the modified Boltzmann plot method utilizing the Ar 4p→4s transitions. The plume temperature is determined by using the fitting the fine structure of the emission bands of OH molecules and by utilizing the line shape of the transition. They are compared with the results obtained by optical fiber thermometer. The characteristics of plasma jet are studied by employing different excitation mode and by adjusting the gas flow rates, the applied voltage, and the amount of additive O2 flow. The characteristic differences between the Ar plasma jet and the He plasma jet are compared. The effects of the additive O2 gas are investigated. The plasma bullet velocity is found to increase with the applied voltage but to decrease with the duty cycle. Also the preliminary results of microplasma effects on the human breast cancer cells are presented.
[en] Metal insulator semiconductor diodes were made by utilizing TiO2 ceramics. Tunnel field emission is here proposed as a model for rectification in TiO2 diode. Measurements of junction depth show very satisfactory agreement with value obtained from the Richardson plot, thus serving as additional supporting evidence of field emission in TiO2 ceramic. The measured junction area exceeds by a factor of 106 the value expected by assuming field emission. The Richardson plot shows a deviation from the emission theory at low voltage, which is probably due to leakage currents which are present in MIS rutile diode. (author)
[en] The Lead Zirconate-Titanate (PZT) ceramic elements are used for piezoelectric materials. In this paper, I studied the dependence of frequency and temperature on the relative dielectric constant, electromechanical coupling coefficient, mechanical quality factor of PZT ceramic which is made by hot-pressing method and investigated the electron micrographs of the etched surface of PZT ceramics prepared by various sintering condition. (author)
[en] In this paper, the diffusion coefficient for a plasma in sheared magnetic field is considered. Particle diffusion will be estimated as 10-2-10-3 of the Bohm diffusion, and the result gives an estimate of 3-4 times less than the diffusion of the particles of a plasma in a homogeneous magnetic field. (author)
[en] We investigated the visual tracer distribution pattern and serial changes in uptake ratio in different anatomical zones during the natural postoperative course in order to establish a reference for evaluation of patients with complications. A total of 36 patients without symptoms after hip or knee arthroplasty were grouped according to the interval between surgery and the scan. The serial changes in SUVmean in each periprosthetic zone were quantified using the volume of interest isocontour method. Images were classified according to the uptake distribution pattern. The uptake ratios in the postoperative period groups were then compared using the Kruskal-Wallis test. The correlation between uptake ratio and postoperative period was then determined. Tracer distribution patterns in hip prostheses were classified into three types and the patterns in knee prostheses into five types. In hip prostheses, intense osteoblastic activity was observed during 3-6 months and then declined in most patients, but showed a slight increase over 15-25 months in 5-10 % of patients. The correlation coefficients varied among the zones. Significant differences in uptake ratios among the period groups was found for all zones, except zone 8. Porous coated areas showed higher uptake than uncoated areas only for the period the 3-6 months. In knee prostheses, uptake ratios showed a curvilinear pattern, increasing from 3-6 to 8-15 months and declining later. The uptake ratios were different among the period groups. Every zone showed a positive correlation from 3-6 to 8-15 months, and negative correlations from 8-15 to 22-25 months. This is the first "1"8F-sodium fluoride PET/CT study investigating the stability of implants and sets a reference for evaluation of patients with complications