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Daegu, South Korea

Ahn B.-C.,Kyungpook National University | Ahn G.,Daegu Il Science High School | Kim D.-H.,Kyungpook National University | Kim K.D.,Yeungnam University | And 3 more authors.
Annals of Nuclear Medicine | Year: 2014

Purpose: Pinhole has been used for magnification of gamma camera images and is valuable for imaging of small organs, such as thyroid; however, size of the organ cannot be measured on the image due to variable degree of magnification by distance between the pinhole and the organ. The aim of this study was to develop a true size measuring system (TSM system) on magnified pinhole thyroid scan using an ultrasonic sensor.Methods: An ultrasonic device capable of measuring the distance from the pinhole to the skin overlying the thyroid gland was manufactured using a ~40 kHz piezoelectric-transducer-based sensor, and its accuracy was tested. An interface program was developed and fused with the ultrasonic device for development of the TSM system. Accuracy of the TSM system for measuring size was tested with phantom images and 35 thyroid scans.Results: The ultrasonic device accurately measured the distance from the pinhole to the skin over the thyroid gland and the measured values were highly reproducible (6 cm; 6.02 ± 0.04 cm, 8 cm; 8.00 ± 0.05 cm, 10 cm; 10.00 ± 0.05 cm). Distance on the phantom image corrected by the TSM system was almost the same as the true distance. Size of the thyroid on the pinhole image was larger (+67.3 to 103.1 %) than the true thyroid size on the parallel-hole image and the magnification decreased by increase of the distance between the pinhole and the skin over the thyroid gland. However, size of the thyroid obtained using the TSM system was almost equal (−2.1 to +3.6 %) to the true thyroid size on the parallel-hole image.Conclusions: We developed the TSM system for magnified pinhole images using a distance measuring ultrasonic sensor. Size of the thyroid on the magnified pinhole image obtained using the system was almost the same as the true thyroid size. The TSM system can be applied to obtain accurate size of the thyroid gland or lesions in the thyroid gland on pinhole thyroid scan. © 2014, The Japanese Society of Nuclear Medicine. Source

Choi Y.I.,Yeungnam University | Jeon K.H.,Daegu Il Science High School | Kim H.S.,Daegu Il Science High School | Lee J.H.,Daegu Il Science High School | And 4 more authors.
Separation and Purification Technology | Year: 2016

The hybridization of two different materials is important for achieving improved photocatalytic degradation properties. Generally, photocatalysts do not show good linear catalytic performance toward all the dyes. This paper reports the synthesis of nano-assembled TiO2/BiOX (X = Cl, Br, or I) hybrid microspheres, which were confirmed by powder X-ray diffraction, field emission scanning electron microscopy, electron transmission microscopy, UV-visible spectroscopy, Fourier-transform infrared spectroscopy, and photoluminescence spectroscopy. The synthesized photocatalysts were examined extensively for their photocatalytic activities with single (orange G and tartrazine), mixed dyes (methyl orange + rhodamine B + methylene blue), natural dyes extracted from grapes and cabbages (real sample analysis) as well as a commercially available drink with and without H2O2 addition under visible light irradiation. For the mixed dyes, TiO2/BiOI showed the highest adsorption capacity and TiO2/BiOCl showed the highest photocatalytic activity. Methyl orange in the mixed dyes was the most rapidly photodegraded of all the photocatalysts examined. TiO2/BiOI showed the highest photocatalytic activity for orange G and tartrazine. The three different photocatalysts showed effective and uniform degradation activity to the natural dyes obtained from grapes and cabbages. The dye degradation was enhanced by H2O2 addition. © 2016 Elsevier B.V. All rights reserved. Source

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