使用pyradiomics提取muti-ROIs特征

使用pyradiomics提取多ROI特征, 以及判断连通域mask个数
github.com/Radiomics/pyradiomics/issues/570
github.com/Radiomics/pyradiomics/issues/293

If you want to make sure you don't have separate volumes, try to use SimpleITK's ConnectedComponentImageFilter, which can split your connected ROI's. As a final check, PyRadiomics puts out the diagnostic feature 'Diagnostics_Mask-original_VolumeNum', which uses the same ConnectedComponentImageFilter to detect how many connected ROI's are identified by the provided 'label/label_channel'.