A 33-year-old male presented to the emergency department complaining of right upper quadrant pain and was initially diagnosed with acute cholecystitis. Abdominal computed tomography showed a whirling pattern of fatty streaks and vessels within the greater omentum, and surgery confirmed infarction of the omentum secondary to torsion. We report a case of surgically and pathologically proven omental torsion that demonstrated the typical whirling appearance on computed tomography.

This study investigated the photocatalytic activity of an Fe containing TiO 2 film produced in the FePO 4 electrolyte via the plasma electrolytic oxidation (PEO) method. For this purpose, the PEO process was carried out on titanium substrate under ac condition in two different alkaline electrolytes containing K 3 PO 4 and FePO 4 respectively. The structure, chemical composition and constituent phases of the PEO treated samples were analysed via SEM, X-ray photoelectron spectroscopy and X-ray diffraction. The optical properties of the samples were also examined by an ultraviolet-visible spectrophotometer. In terms of the photocatalytic activity judging from the decomposition of methylene blue under visible light illumination, the sample formed in the FePO 4 electrolyte was better than that in the K 3 PO 4 electrolyte due to the incorporation of an Fe compound that has a narrow band gap.

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Using a plasma electrolytic oxidation (PEO) process, this study investigated how the pore size of the coating surface influences the growth of osteoblast cells and their morphology in pure titanium. With this aim, PEO coatings were applied using four different electric and electrolyte conditions to vary the mean pore sizes of the coatings from ,2 to ,5 mm. In vitro examinations showed that the osteoblast cells on the surface of the coating with ,2 mm pores had grown healthily with good attachment by multiple pseudopodia connections; cells were highly proliferated, compared to those of other samples. In addition, the coating with ,2 mm pores showed the highest cell viability among the samples.

A double-scattering Compton camera that can effectively obtain three-dimensional emission images in high-energy gamma-ray applications such as nuclear decommissioning and particle therapy monitoring has been developed. The double-scattering Compton camera utilizes two position-sensitive detectors as scatter detectors to determine the trajectory of a scattered gammaray, and a scintillation detector as absorber detector to measure the remaining energy of the doublescattered gamma-ray. The benefit of using two scatter detectors is the accurate determination of the gamma-ray trajectory after the scattering at the first scatter detector, which makes possible higher imaging resolution. In the present study, Geant4 Monte Carlo simulations were conducted to compare the performance of the double-scattering Compton camera with that of a similarly dimensioned single-scattering Compton camera for different source energies. Further, the optimal geometry of the multiple-detector-type double-scattering Compton camera was investigated for the purposes of increasing its imaging sensitivity. The results showed that the double-scattering Compton camera offers superior angular resolution over the entire energy range considered in the present study, whereas the single-scattering Compton camera provides greater sensitivity. The results also showed that, in general, the placement of additional detectors in the axial direction (i.e., stacking) is more effective for sensitivity improvement than doing so in the planar direction. This axial placement, however, lowers the imaging resolution. The double-scattering Compton camera exhibited the highest sensitivity when the additional scatter detectors were added to the first scatter detector

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