The liver has eight segments, which are referred to by numbers or by names. The numbering of the segments is done in a counterclockwise manner with the liver being viewed from the inferior surface, starting from Segme...The liver has eight segments, which are referred to by numbers or by names. The numbering of the segments is done in a counterclockwise manner with the liver being viewed from the inferior surface, starting from Segment Ⅰ(the caudate lobe). Standard anatomical description of the liver segments is available by computed tomographic scan and ultrasonography. Endoscopic ultrasound(EUS) has been used for a detailed imaging of many intra-abdominal organs and for the assessment of intra-abdominal vasculature. A stepwise evaluation of the liver segments by EUS has not been described. In this article, we have described a stepwise evaluation of the liver segments by EUS. This information can be useful for planning successful radical surgeries, preparing for biopsy, portal vein embolization, transjugular intrahepatic portosystemic shunt, tumour resection or partial hepatectomy, and for planning EUS guided diagnostic and therapeutic procedures.展开更多
雷达高分辨距离像(radar high resolution range profile,HRRP)具有姿态敏感性的特点,一种有效的方法是分别对一组不发生散射点越距离单元走动角域范围内的HRRP样本进行处理。提出基于HRRP回波功率谱的顺序判别自适应分帧算法,通过对全...雷达高分辨距离像(radar high resolution range profile,HRRP)具有姿态敏感性的特点,一种有效的方法是分别对一组不发生散射点越距离单元走动角域范围内的HRRP样本进行处理。提出基于HRRP回波功率谱的顺序判别自适应分帧算法,通过对全局HRRP样本进行迭代搜索来确定数据划分边界,并自适应划分角域个数。所提方法依据散射点模型理论,考虑功率谱互相关系数变化规律,有效抑制了HRRP存在"距离像起伏剧烈"的样本。与自适应高斯分类器划分角域方法相比,所提方法在样本数据较小的情况下,仍可以有效地对目标进行角域划分。同时,与传统的利用互相关系数分帧方法和等间隔角域划分方法相比,所提方法可以有效降低识别运算量,减少识别算法处理时间,通过对3类舰船目标的仿真和3类民用船只的外场实测数据分析,表明所提方法是有效的。展开更多
现有高分辨距离像(high resolution range profile,HRRP)在线识别方法的训练过程往往需要大规模的训练样本集,难以在小规模样本条件下进行在线识别。针对小规模HRRP样本集的在线识别问题,推导了增量支持向量数据描述(incremental suppor...现有高分辨距离像(high resolution range profile,HRRP)在线识别方法的训练过程往往需要大规模的训练样本集,难以在小规模样本条件下进行在线识别。针对小规模HRRP样本集的在线识别问题,推导了增量支持向量数据描述(incremental support vector data description,ISVDD)算法,并提出了基于ISVDD的HRRP在线识别方法。该方法在训练过程避免了对大规模样本集的需求,能够获得良好的识别效果。同时,由于ISVDD应用于在线识别,相对于标准支持向量数据描述在线识别方法,大大减少了新增样本的训练时间,而且能够获得和成批支持向量数据描述识别方法相同的识别性能。基于4种飞机目标的实验结果证明了本文方法的正确性和有效性。展开更多
目的:探讨肝门胆管癌根治切除联合左半肝及右前叶腹侧段切除的临床疗效。方法:回顾性分析2019年11月北京清华长庚医院1例肝门胆管癌病人行根治切除联合左半肝及右前叶腹侧段切除的临床资料,并复习相关肝脏右前叶解剖和手术的文献。结果...目的:探讨肝门胆管癌根治切除联合左半肝及右前叶腹侧段切除的临床疗效。方法:回顾性分析2019年11月北京清华长庚医院1例肝门胆管癌病人行根治切除联合左半肝及右前叶腹侧段切除的临床资料,并复习相关肝脏右前叶解剖和手术的文献。结果:本病例为74岁女性病人,术前影像学诊断为BismuthⅣ型肝门胆管癌,成功经历肝门胆管癌根治切除联合左半肝及右前叶腹侧段切除术,手术时间共11 h 23 min,术中出血300 mL。术后病情平稳,术后第17天出院。结论:肝门胆管癌根治切除联合左半肝及右前叶腹侧段切除与肝门胆管癌根治切除联合左三区切除手术方式相比,可在根治性切除目标病灶同时有效地保留更多功能性肝体积,避免术后肝衰竭的发生。展开更多
文摘The liver has eight segments, which are referred to by numbers or by names. The numbering of the segments is done in a counterclockwise manner with the liver being viewed from the inferior surface, starting from Segment Ⅰ(the caudate lobe). Standard anatomical description of the liver segments is available by computed tomographic scan and ultrasonography. Endoscopic ultrasound(EUS) has been used for a detailed imaging of many intra-abdominal organs and for the assessment of intra-abdominal vasculature. A stepwise evaluation of the liver segments by EUS has not been described. In this article, we have described a stepwise evaluation of the liver segments by EUS. This information can be useful for planning successful radical surgeries, preparing for biopsy, portal vein embolization, transjugular intrahepatic portosystemic shunt, tumour resection or partial hepatectomy, and for planning EUS guided diagnostic and therapeutic procedures.
文摘雷达高分辨距离像(radar high resolution range profile,HRRP)具有姿态敏感性的特点,一种有效的方法是分别对一组不发生散射点越距离单元走动角域范围内的HRRP样本进行处理。提出基于HRRP回波功率谱的顺序判别自适应分帧算法,通过对全局HRRP样本进行迭代搜索来确定数据划分边界,并自适应划分角域个数。所提方法依据散射点模型理论,考虑功率谱互相关系数变化规律,有效抑制了HRRP存在"距离像起伏剧烈"的样本。与自适应高斯分类器划分角域方法相比,所提方法在样本数据较小的情况下,仍可以有效地对目标进行角域划分。同时,与传统的利用互相关系数分帧方法和等间隔角域划分方法相比,所提方法可以有效降低识别运算量,减少识别算法处理时间,通过对3类舰船目标的仿真和3类民用船只的外场实测数据分析,表明所提方法是有效的。
文摘现有高分辨距离像(high resolution range profile,HRRP)在线识别方法的训练过程往往需要大规模的训练样本集,难以在小规模样本条件下进行在线识别。针对小规模HRRP样本集的在线识别问题,推导了增量支持向量数据描述(incremental support vector data description,ISVDD)算法,并提出了基于ISVDD的HRRP在线识别方法。该方法在训练过程避免了对大规模样本集的需求,能够获得良好的识别效果。同时,由于ISVDD应用于在线识别,相对于标准支持向量数据描述在线识别方法,大大减少了新增样本的训练时间,而且能够获得和成批支持向量数据描述识别方法相同的识别性能。基于4种飞机目标的实验结果证明了本文方法的正确性和有效性。
文摘目的:探讨肝门胆管癌根治切除联合左半肝及右前叶腹侧段切除的临床疗效。方法:回顾性分析2019年11月北京清华长庚医院1例肝门胆管癌病人行根治切除联合左半肝及右前叶腹侧段切除的临床资料,并复习相关肝脏右前叶解剖和手术的文献。结果:本病例为74岁女性病人,术前影像学诊断为BismuthⅣ型肝门胆管癌,成功经历肝门胆管癌根治切除联合左半肝及右前叶腹侧段切除术,手术时间共11 h 23 min,术中出血300 mL。术后病情平稳,术后第17天出院。结论:肝门胆管癌根治切除联合左半肝及右前叶腹侧段切除与肝门胆管癌根治切除联合左三区切除手术方式相比,可在根治性切除目标病灶同时有效地保留更多功能性肝体积,避免术后肝衰竭的发生。
