心肌受累疾患病种较多,包括原发性及继发性改变,由于其伴心功能受损而严重危及患者生命,因此早期诊断并干预心肌改变显得尤为重要。心脏磁共振(cardiac magnetic resonance,CMR)广泛应用于与心血管疾病相关的各种医学领域。近年来快速...心肌受累疾患病种较多,包括原发性及继发性改变,由于其伴心功能受损而严重危及患者生命,因此早期诊断并干预心肌改变显得尤为重要。心脏磁共振(cardiac magnetic resonance,CMR)广泛应用于与心血管疾病相关的各种医学领域。近年来快速的技术创新促进了CMR成像新技术的发展。参数定量技术如纵向弛豫时间定量成像(T1 mapping)、横向弛豫时间定量成像(T2 mapping)提供了一种非侵入性检查手段,可量化心肌疾病中的组织改变。这些变化主要包括心肌纤维化、心肌水肿伴细胞内和/或细胞外水增加、心肌内出血等病理改变。T1 mapping和T2 mapping不仅被认为是诊断心肌病的可靠生物标志物,而且被认为是治疗监测和预后评估中可靠的影像学参数。本文就参数定量技术评估心肌组织方面的应用及研究进展予以综述,目的是阐述参数定量技术如何早期和精准识别异常心肌,同时提出了存在的问题及未来研究思路,为该技术的研究提供参考。展开更多
Volume diffuse dielectric barrier discharge （DBD） plasma is produced in subsonic airflow by nanosecond high-voltage pulse power supply with a plate-to-plate discharge cell at 6 mm air gap length. The discharge image...Volume diffuse dielectric barrier discharge （DBD） plasma is produced in subsonic airflow by nanosecond high-voltage pulse power supply with a plate-to-plate discharge cell at 6 mm air gap length. The discharge images, optical emission spectra （OES）, the applied voltage and current waveforms of the discharge at the changed airflow rates are obtained. When airflow rate is increased, the transition of the discharge mode and the variations of discharge intensity, breakdown characteristics and the temperature of the discharge plasma are investigated. The results show that the discharge becomes more diffuse, discharge intensity is decreased accompanied by the increased breakdown voltage and time lag, and the temperature of the discharge plasma reduces when airflow of small velocity is introduced into the discharge gap. These phenomena are because that the airflow changes the spatial distribution of the heat and the space charge in the discharge gap.展开更多
基金supported by National Natural Science Foundation of China(No.51437002)
文摘Volume diffuse dielectric barrier discharge （DBD） plasma is produced in subsonic airflow by nanosecond high-voltage pulse power supply with a plate-to-plate discharge cell at 6 mm air gap length. The discharge images, optical emission spectra （OES）, the applied voltage and current waveforms of the discharge at the changed airflow rates are obtained. When airflow rate is increased, the transition of the discharge mode and the variations of discharge intensity, breakdown characteristics and the temperature of the discharge plasma are investigated. The results show that the discharge becomes more diffuse, discharge intensity is decreased accompanied by the increased breakdown voltage and time lag, and the temperature of the discharge plasma reduces when airflow of small velocity is introduced into the discharge gap. These phenomena are because that the airflow changes the spatial distribution of the heat and the space charge in the discharge gap.
