import os
import xlsxwriter
import pydicom
import glob
import pandas as pd
from pydicom import dcmread
import numpy
#os.chdir(r'Y:\pharmascan\huang\186RNL\01_019\baseline')
rootdir = r'Y:\pharmascan\huang\186RNL\01_019\baseline'
#patients = defaultdict(list)
for file in os.listdir(rootdir):
d = os.path.join(rootdir, file)
if os.path.isdir(d):
#print(os.getcwd()) #list present directory
os.chdir(d) #change prenent directory
#print(d)
#dcm_path = d+'\*.dcm'
for filename in glob.glob("*.dcm"): # or whatever your pattern is
#print(filename)
ds = dcmread(filename, stop_before_pixels=True)