Search

Objective To perform quantitative measurement based on the standardized uptake value (SUV) of Tc-99m methylene diphosphonate (MDP) in the normal pelvis using a single-photon emission tomography (SPECT)/computed tomography (CT) scanner. Material and methods This retrospective study was performed on 31 patients with cancer undergoing bone SPECT/CT scans with 99mTc-MDP. SUVmax and SUVmean of the normal pelvis were calculated based on the body weight. SUVmax and SUVmean of the bilateral anterior superior iliac spine, posterior superior iliac spine, facies auricularis ossis ilii, ischial tuberosity, and sacrum were also calculated. Furthermore, the correlation of SUVmax and SUVmean of all parts of pelvis with weight, height, and CT was assessed. Results The data for 31 patients (20 women and 11 men; mean age 58.97±9.12 years; age range 37-87 years) were collected. SUVmax and SUVmean changed from 1.65±0.40 to 3.8±1.0 and from 1.15±0.25 to 2.07±0.58, respectively. The coefficient of variation of SUVmax and SUVmean ranged from 0.22 to 0.31. SUVmax and SUVmean had no statistically significant difference between men and women. SUVmax and SUVmean also showed no significant correlation with weight and height. However, part of SUVmax and SUVmean showed a significant correlation with CT. In addition, SUVmax and SUVmean of the bilateral ischial tuberosity showed a significant correlation with CT values. Conclusions Determination of the SUV value of the normal pelvis with 99m Tc-MDP SPECT/CT is feasible and highly reproducible. SUVs of the normal pelvis showed a relatively large variability. As a quantitative imaging biomarker, SUVs might require standardization with adequate reference data for the participant to minimize variability.

A magneto-fluid filled one-dimensional photonic crystal sensing structure based on mixed localization states is proposed. The sensitivities of magnetic filed and temperature can reach 156 pm/mT and −94pm/°C in 10-35mT and 0-50°C.

As a kind of high temperature combustion technology, oxygen-enriched combustion is widely used in the fields of glass industry, metallurgical industry and thermal power engineering. In order to further increase the combustion temperature and save energy simultaneously, this paper researched and analyzed the combustion mode which combines the regenerative combustion technology and oxygen-enriched combustion, and contrastively analyzed each combustion features of regenerative oxygen-enriched combustion technology. CFD engineering simulation software FLUENT is adapted to simulating combustion under the operating condition. Through comparison of simulation and experimental result, the influence of oxygen concentration on combustion in furnace and temperature is confirmed; meanwhile under this condition, energy consumption is reduced. The research result indicated that this technology not only increases temperature and decrease operating cost, it also has more widely application scope.