针对多频点、大样本量生物电磁暴露系统中剂量差异特征不明确的问题,采用生物电磁仿真软件Sim4Life建立了4种对比仿真环境,仿真频率点为1.8 GHz、2.4 GHz、3.6 GHz和5.8 GHz,对实验小鼠的散射电场和全身平均比吸收率(Whole body average...针对多频点、大样本量生物电磁暴露系统中剂量差异特征不明确的问题,采用生物电磁仿真软件Sim4Life建立了4种对比仿真环境,仿真频率点为1.8 GHz、2.4 GHz、3.6 GHz和5.8 GHz,对实验小鼠的散射电场和全身平均比吸收率(Whole body average specific absorption ratio,WBASAR)进行了仿真计算及分析。结果表明:受到电磁散射的影响,邻近布局中实验动物的WBASAR值随空间分布变化,变化规律与激励电场的分布趋势相似;激励电场是引起WBASAR值变化的主要因素。此外,WBASAR值的变化还受到频率的影响,高“身体尺寸-波长”比值抑制WBASAR值的变化。针对实验动物的电磁剂量变化特征,提出了降低群体剂量不确定性的设计建议。本研究为生物电磁实验平台的设计提供了剂量评估基础。展开更多
OBJECTIVE To observe the dose and the complicationsfrom total body irradiation before hematopoietic stem celltransplantation.METHODS This study involved 312 patients with total bodyirradiation before hematopoietic ste...OBJECTIVE To observe the dose and the complicationsfrom total body irradiation before hematopoietic stem celltransplantation.METHODS This study involved 312 patients with total bodyirradiation before hematopoietic stem cell transplantation. Theywere entered into the treated research from May 1999 to October2005. All patients had received the irradiation from ^(60)Co of anabsorbed dose rate of (5.2 ± 1.13) cGy/min. The total dose of TBIwas 7~12 Gy, 1 f/d × 2 d. A high-dose rate group (≥10 Gy) included139 cases and a low-dose rate group (< 10 Gy) included 173 cases.RESULTS The probability of acute gastrointestinal reactionsin the high-dose rate group was more compared with that in thelow-dose rate group. The differences for other reactions, such ashematopoietic reconstitution and graft survival rate, between thetwo groups were insignificant.CONCLUSION Using fractional total body irradiation at a doserate of 5 cGy/min, with a total dose of 7~12 Gy, 1 f/d × 2 d , withthe lung receiving under 7.5 Gy is a safe and effective pretreatmentfor hematopoietic stem cell transplantation.展开更多
文摘针对多频点、大样本量生物电磁暴露系统中剂量差异特征不明确的问题,采用生物电磁仿真软件Sim4Life建立了4种对比仿真环境,仿真频率点为1.8 GHz、2.4 GHz、3.6 GHz和5.8 GHz,对实验小鼠的散射电场和全身平均比吸收率(Whole body average specific absorption ratio,WBASAR)进行了仿真计算及分析。结果表明:受到电磁散射的影响,邻近布局中实验动物的WBASAR值随空间分布变化,变化规律与激励电场的分布趋势相似;激励电场是引起WBASAR值变化的主要因素。此外,WBASAR值的变化还受到频率的影响,高“身体尺寸-波长”比值抑制WBASAR值的变化。针对实验动物的电磁剂量变化特征,提出了降低群体剂量不确定性的设计建议。本研究为生物电磁实验平台的设计提供了剂量评估基础。
文摘OBJECTIVE To observe the dose and the complicationsfrom total body irradiation before hematopoietic stem celltransplantation.METHODS This study involved 312 patients with total bodyirradiation before hematopoietic stem cell transplantation. Theywere entered into the treated research from May 1999 to October2005. All patients had received the irradiation from ^(60)Co of anabsorbed dose rate of (5.2 ± 1.13) cGy/min. The total dose of TBIwas 7~12 Gy, 1 f/d × 2 d. A high-dose rate group (≥10 Gy) included139 cases and a low-dose rate group (< 10 Gy) included 173 cases.RESULTS The probability of acute gastrointestinal reactionsin the high-dose rate group was more compared with that in thelow-dose rate group. The differences for other reactions, such ashematopoietic reconstitution and graft survival rate, between thetwo groups were insignificant.CONCLUSION Using fractional total body irradiation at a doserate of 5 cGy/min, with a total dose of 7~12 Gy, 1 f/d × 2 d , withthe lung receiving under 7.5 Gy is a safe and effective pretreatmentfor hematopoietic stem cell transplantation.