[Application of Molecular Imaging Equipment PET/MRI].

To compare the principles and system frameworks on PET and MRI systems. The functional characteristics and present adoptive structural models of PET/MRI as molecular imaging equipment is introduced in particular. To compare several update techniques of attenuation correction for PET image with MRI parameters and to expatiate their deficiencies. The advantages on PET/MRI clinical applications and the future development of PET/MRI are introduced briefly.

[Technical Progress of Integrated Simultaneous TOF-PET/MR Molecular Imaging Equipment].

This paper introduces component, principle and technical progress of integrated simultaneous TOF-PET/MR molecular imaging equipment. It briefly describes the integrated PET/MRI device design and composition classification. IT discusses special contributions to clinical application and research with TOF-PET/MR, requirement of photoelectric component on PET detector for attaining TOF reconstruction and the prerequisite that performed simultaneous scan on PET/MR. It compares the performance differences between APD and SSPM. The problems and the challenges of PET attenuation correction with MR image parameters are introduced briefly.

[The research progress of SPECT/CT].

With the development of molecular imaging technology, incorporate multiple modes of medical imaging imaging techniques of SPECT/CT and PET/CT technology with a certain degree of development. But compared to SPECT/CT and PET/CT technologies, SPECT/CT far earlier than PET/CT technology to clinical applications, due to a variety of factors influence SPECT/CT far PET/CT clinical applications to grow faster. This article highlights the progress and problems of SPECT/CT technology.

[Detection of trace uranium in air with field spectrometry].

As a natural radioactive element, uranium and its compounds exist as aerosol and transfer in air. In gas phase, uranium can cause various kinds of radioactive damage to human body. The change in its concentration in a local area is related to the exploration and utilization of nuclear energy. Therefore, the development of field method for rapid uranium detection in air sample is very important. In this contribution, the air samples over uranium ores collected by a general pump was absorbed with 2.0 mol x L(-1) nitrate and then reacted with solid reagent kit. When the reaction between trace uranium and chromogenic reagent was finished, the homemade portable photometer was used to measure the absorbance. The results showed that the concentration of uranium in air samples over low grade uranium ores can be successfully determined by the present method and the values agree with that obtained by ICP-MS. The RSD measured by the new method was 1.72%. The application of the new field spectrometry in discriminating uranium ores from other ores has the potential advantages of easy operation, cost-saving and high accuracy.