how to select the transversal plane images from ProstateX dataset

Question

Whenever we use the series description and image orientation patient tag both time it gives different pics list?

import pydicom
import os

def select_transverse_images(root_dir):
    transverse_images = []
    
    root_dir = 'D:\\prostate images\\Train\\ProstateX'

    # iterate over subdirectories
    for sub1_dir_name in os.listdir(root_dir):
        sub1_dir_path = os.path.join(root_dir, sub1_dir_name)
        if os.path.isdir(sub1_dir_path):
            # iterate over sub-subdirectories
            for sub2_dir_name in os.listdir(sub1_dir_path):
                sub2_dir_path = os.path.join(sub1_dir_path, sub2_dir_name)
                
                # iterate over sub-sub-subdirectories
                for sub3_dir_name in os.listdir(sub2_dir_path):
                    sub3_dir_path = os.path.join(sub2_dir_path, sub3_dir_name)
                    
                    # iterate over DICOM files
                    for file_name in os.listdir(sub3_dir_path):
                        if file_name.endswith(".dcm"):
                            file_path = os.path.join(sub3_dir_path, file_name)
                            ds = pydicom.dcmread(file_path)
                            #if ds.ImageOrientationPatient[:2] in ([1, 0], [-1, 0]):
                            if ds.ImageOrientationPatient[:6] in ([1, 0, 0, 0, 1, 0], [-1, 0, 0, 0, -1, 0]):
                                print(f"Found transverse image: {file_path}")
                                transverse_images.append(ds)
                          

    return transverse_images

dataset_dir = 'D:\\prostate images\\Train\\ProstateX'
transverse_images = select_transverse_images(dataset_dir)