Quantitative Assessment of Lipiodol-Related Artifact Reduction for Dual-Energy Computed Tomography After Transcatheter Arterial Chemoembolization: A Phantom Study Evaluating the Use of Metal Artifact Reduction Algorithms.

OBJECTIVE: This study used metal artifact reduction (MAR) software to examine the computed tomography (CT) number of dual-energy CT (DECT) of hepatocellular carcinoma after transcatheter arterial chemoembolization. METHODS: Hollow columnar acrylic phantoms were filled with lipiodol and inserts of 2 sizes (large and small) were used to simulate liver tumors on a Revolution GSI CT scanner. The CT numbers of a single test object were collected twice: once with and once without the MAR algorithm. Lipiodol beam-hardening artifacts were quantified by measuring CT numbers in a region of interest around the tumor-simulating insert. RESULTS: The virtual monochromatic CT numbers of large and small tumors were closely related to energy. For small tumors, CT numbers increased with energy. For large tumors, CT numbers increased with energy at 1 cm from the margin but decreased with an increase in energy at 5 cm. Regardless of the size, distance, or location of the tumor, the CT numbers fluctuated more at low energy levels. CONCLUSIONS: At 1 cm from the margin, the CT numbers with MAR were significantly different from those without MAR. Low-energy CT numbers with MAR were near reference values. Metal artifact reduction exhibited superior performance for small tumors. Tumor margin images are affected by artifacts caused by Lipiodol. However, with MAR, CT numbers can be effectively calibrated, thus enabling clinicians to more accurately evaluate hepatocellular carcinoma development and identify residual tumors and recurrent or metastatic lesions.

A fluorescent chemosensor based on naphthol for detection of Zn(2).

A simple naphthol-based fluorescent receptor 1 was prepared and evaluated for its fluorescence response to heavy metal ions. Receptor 1 exhibits an 'off-on-type' mode with high selectivity in the presence of Zn(2+) ion. The selectivity of 1 for Zn(2+) is the consequence of combined effects of chelation-enhanced fluorescence (CHEF), C = N isomerization and π-π stacking interaction between the two naphthalene rings.

[A Community-Based Experience Model of Mental-Social Health Promotion for Older People in Taichung City].

Active ageing is one of the most important issues taken up by the WHO in regard to ageing societies. "Prolonging Healthy Life Expectance" and "Decreasing the Depression Rate Among Older People" are critical indicators for "2020 Healthy People in Taiwan". This paper conducts a trial run of the program planning and evaluation of mental-social health promotion using focus group research that surveys 29 administrative districts and a depression survey that randomly samples older individuals in Taichung City. We also introduce how we apply local characteristics to develop the 3-level and innovative-action plans to meet the needs of self-identity and social participation for older people. For example, the "Learning Mobile Classroom" program promotes health promotion using activities that are tailored to the lifestyle and culture characteristics of target individuals. Another example is the "Seniors Show", which uses community groups and annual active-ageing shows to promote a positive concept of aging and to promote social participation for older people. Finally, the "Navigator APP of Active Ageing", created using a geographic information system, addresses the resource information needs of older people. This experience in Taichung City uniquely empowers older people, allowing them to take the initiative to make a difference not only for mental-social wellness but also for the hope of life and for graceful ageing.

A Schiff-based sensor with turn-on fluorescence for selective detection of Hg2+.

A simple Schiff-base colorimetric receptor 1 was prepared. It exhibits an 'off­on-type' mode with high sensitivity in the presence of Hg2+. The change in color is very easily observed by the naked eye in the presence of Hg2+, whereas other metal cations do not induce such a change. A Job plot indicated a 1 : 1 complexation stoichiometry between receptor 1 and Hg2+. The association constant for 1­Hg2+ in Tetrahydrofuran (THF) was determined to be 1.3 × 10(9)M-1 using a Hill plot.

A turn-on indole-based sensor for hydrogen sulfate ion.

A simple indole-based receptor 1 was prepared by a simple Schiff-base reaction of 1H-indole-3-carbaldehyde with ethane 1,2-diamine and its fluoroionophoric properties toward anions were investigated. Indole-based receptor 1 acts as a selective turn-on fluorescent sensor for HSO4(-) in methanol among a series of tested anions. Fluorescence spectroscopy, ultraviolet and nuclear magnetic resonance imaging support that the HSO4(-) indeed interacted with imine nitrogen and the proton of nitrogen in indole ring.

A turn-on and reversible fluorescence sensor for zinc ion.

A simple Schiff base type fluorescent receptor was prepared and evaluated for its fluorescence response to heavy metal ions. Receptor 1 exhibits an "off-on-type" mode with high selectivity in the presence of Zn(2+) ion. The addition of EDTA quenches the fluorescence of receptor 1-Zn(2+) complex, making receptor 1 a reversible chemosensor. The selectivity of 1 for Zn(2+) is the consequence of combined effects of CHEF, C=N isomerization and inhibition of ESIPT.