[en] Objective: To investigate the optimal workflow and protocol for integrated PET/MR by comparison with PET/CT. Methods: A total of 228 patients were enrolled in this study for PET/CT and PET/MR evaluation on the same day. Six PET/MR protocols with different MR sequences but the same PET acquisition protocol were investigated and the optimal protocol was identified based on image quality, acquisition time and diagnostic performance. Results: PET/MR workflow was similar to PET/CT, however, some special issues needed to be considered for PET/MR. Among the 6 protocols, protocol No.6 outperformed others for body and head regions. Types of artifacts were found more often in PET/MR than in PET/CT. Conclusions: By optimizing the protocol, PET/MR could achieve almost the same diagnostic performance as PET/CT. However, the issues of long acquisition time and artifacts on PET/MR need to be further improved. (authors)

[en] Highlights: •Polycrystalline diamond films were grown on Mo foil substrates by HF-CVD. •We investigated the temperature dependence of the film stress for each sample. •We show that how the thermal stress and intrinsic stress affects the total stress. •The stress of Mo foil substrate obtained by XRD was investigated in this study. •The effect of Mo₂C interface layer for stress of multilayer system was considered. -- Abstract: Polycrystalline diamond films have been prepared by hot-filament-assisted chemical vapor deposition (HFCVD) on Mo foils. The morphology, growth rate, phase composition, element distribution and residual stress of the films at different temperature were investigated by field-emission scanning electron microscopy, Raman spectrum, field emission electron probe microanalysis and X-ray diffraction. Results show that the residual stress of the diamond films is compressive. The thermal stress plays a decisive role in the total stress, while the intrinsic stress can change the trend of the total stress. The residual stress of substrate gradually changes from tensile stress to compressive stress with the increase of the deposited temperature. A Mo₂C interlayer is formed during deposition process, and this layer has an important influence on the stresses of films and substrates