针对肝脏肿瘤分割面临的病灶形状、大小和位置差异明显等问题,文章提出了一种基于空间通道注意力的三维肝脏肿瘤分割方法。在3D U-Net的基础上融合了Transformer,提出成对全局和局部注意力PGLA(Paired Global Local Attention)模块替代T...针对肝脏肿瘤分割面临的病灶形状、大小和位置差异明显等问题,文章提出了一种基于空间通道注意力的三维肝脏肿瘤分割方法。在3D U-Net的基础上融合了Transformer,提出成对全局和局部注意力PGLA(Paired Global Local Attention)模块替代Transformer中的传统注意力模块,并在尺度变换前引入CBAM(Convolutional Block Attention Module)模块。在肝脏肿瘤分割挑战赛数据集上的实验结果显示该方法在肿瘤分割的Dice系数上达到了69.18%,这些成绩均优于当前流行的模型,这证明了该方法在提高肝脏肿瘤分割精度方面的有效性。展开更多
The dual band equilateral triangular microstrip antennas are realized by cutting the slots of either quarter wave or half wave in length, inside the patch. In this design, however these simpler approximations of slot ...The dual band equilateral triangular microstrip antennas are realized by cutting the slots of either quarter wave or half wave in length, inside the patch. In this design, however these simpler approximations of slot length against the frequency do not give closer results for different slot lengths and there positions inside the patch. In this paper, the modal variations of slot cut patch antennas over wide frequency range are studied. It is observed that the slot does not introduce any mode but reduces the higher order mode resonance frequency of the patch and along with the fundamental mode realizes dual band response. The formulations of the resonant length for the mode introduce by the slots in these antennas are proposed. The resonance frequencies calculated using proposed formulations agree well with the simulated results with an error of less than 5%.展开更多
文摘针对肝脏肿瘤分割面临的病灶形状、大小和位置差异明显等问题,文章提出了一种基于空间通道注意力的三维肝脏肿瘤分割方法。在3D U-Net的基础上融合了Transformer,提出成对全局和局部注意力PGLA(Paired Global Local Attention)模块替代Transformer中的传统注意力模块,并在尺度变换前引入CBAM(Convolutional Block Attention Module)模块。在肝脏肿瘤分割挑战赛数据集上的实验结果显示该方法在肿瘤分割的Dice系数上达到了69.18%,这些成绩均优于当前流行的模型,这证明了该方法在提高肝脏肿瘤分割精度方面的有效性。
文摘The dual band equilateral triangular microstrip antennas are realized by cutting the slots of either quarter wave or half wave in length, inside the patch. In this design, however these simpler approximations of slot length against the frequency do not give closer results for different slot lengths and there positions inside the patch. In this paper, the modal variations of slot cut patch antennas over wide frequency range are studied. It is observed that the slot does not introduce any mode but reduces the higher order mode resonance frequency of the patch and along with the fundamental mode realizes dual band response. The formulations of the resonant length for the mode introduce by the slots in these antennas are proposed. The resonance frequencies calculated using proposed formulations agree well with the simulated results with an error of less than 5%.
