在已知DICOM和三维模型对应掩膜的情况下，计算三维模型的体积。

思路：

1、计算每个体素的体积。每个体素为长方体，x，y为PixelSpacing，z为层间距

使用pydicom.read_file读取DICOM文件，dcm_tag.PixelSpacing获取像素间距，dcm_tag.SliceLocation 获取层间距

2、计算体素的个数

代码如下：

from PIL import Imageimport numpy as npimport pydicomimport os def get_pixels_No(bmp_data_dir): pixels_No = 0 bmp_files = os.listdir(bmp_data_dir) for bmp in bmp_files: bmp_file = os.path.join(bmp_data_dir,bmp) img = Image.open(bmp_file) img_array = np.array(img) # img_array.dtype为布尔类型，需要转换为Int类型，其累加和恰好为体素总和 img_array_int = img_array.astype(int) pixels_No = pixels_No+img_array_int.sum() return pixels_No def get_pixel_info(dcm_data_dir): pixel_infos = [] dcm_files = os.listdir(dcm_data_dir) dcm_file_1 = os.path.join(dcm_data_dir,dcm_files[0]) dcm_tag_1 = pydicom.read_file(dcm_file_1) # 获取像素间距. spacex, spacey = dcm_tag_1.PixelSpacing # 获取层间距 # 有些 dcm图像并不是按照InstanceNumber进行排序的，不能直接用最后一张的slicelocation减去第一张，再除以张数 SliceLocations = [] ImagePositon_z = [] for dcm in dcm_files: dcm_file = os.path.join(dcm_data_dir, dcm) dcm_tag = pydicom.read_file(dcm_file) SliceLocations.append(dcm_tag.SliceLocation) ImagePositon_z.append(dcm_tag.ImagePositionPatient[2]) SliceLocations_max =max(SliceLocations) SliceLocations_min =min(SliceLocations) ImagePositon_z_max = max(ImagePositon_z) ImagePositon_z_min = min(ImagePositon_z) print(SliceLocations_max) print(SliceLocations_min) print(ImagePositon_z_max) print(ImagePositon_z_min) if SliceLocations_max - SliceLocations_min < 1e-10: spacez = abs(ImagePositon_z_max - ImagePositon_z_min)/(len(dcm_files)-1) else: spacez = abs(SliceLocations_max - SliceLocations_min)/(len(dcm_files)-1) pixel_infos = [spacex, spacey, spacez] return pixel_infos def get_volume(dcm_data_dir,bmp_data_dir): pixel_infos = get_pixel_info(dcm_data_dir) pixels_No = get_pixels_No(bmp_data_dir) volume=pixel_infos[0]*pixel_infos[1]*pixel_infos[2]*pixels_No/1000 return volume # dcm = pydicom.read_file(r"E:\20181210090945_LENG HONGYING F-44Y\Venous\0000.dcm")# print(dcm)# print(dcm.ImagePositionPatient[2])# print(dcm[0x0020, 0x0032].keyword,dcm[0x0020, 0x0032].value) volume=get_volume(r"E:\20181210090945_LENG HONGYING F-44Y\Venous",r"E:\20181210090945_LENG HONGYING F-44Y\Results\LungL")print("体积为%.1f"%volume)

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