如何将传输语法 UID 添加到数据集的文件元

Question

我使用pydicom库使用来自CT和MRI机器的数据集生成.dcm文件，但是在该数据集中，缺少标签(0002,0010(。由于我没有该标签，因此我无法检测到传输语法，无论是隐式VR小端序，显式VR小端序，jpeg无损等。我需要传输语法来保存带有如下标志的数据集

ds.is_little_endian = True
ds.is_implicit_VR = False
ds.file_meta.TransferSyntaxUID = JPEGLossless
ds.is_explicit_VR = True  etc

如果我不使用上述标志，则生成的 dcm 文件将无效，因为没有传输语法。 由于我不知道传输语法，因此我在运行程序时在命令行参数中发送传输语法，并相应地设置上述标志，并保存数据集。我知道这是错误的方法，但我只是将其用作临时解决方案。有没有更好的方法来检测传输语法，因为缺少标签(0002,0010(。 下面是我用于使用来自 CT 机器的数据集保存 dcm 文件的代码。现在我正在将传输语法作为命令行参数发送

from pynetdicom3 import AE, VerificationPresentationContexts,      StoragePresentationContexts, QueryRetrievePresentationContexts
from pydicom.uid import ImplicitVRLittleEndian, ExplicitVRLittleEndian, JPEGLossless
from pynetdicom3.sop_class import CTImageStorage, MRImageStorage
from pynetdicom3 import pynetdicom_uid_prefix
from pydicom.dataset import Dataset, FileDataset

import argparse
import uuid
import os
import django
import logging
ttt = []
ttt.extend(VerificationPresentationContexts)
ttt.extend(StoragePresentationContexts)
ttt.extend(QueryRetrievePresentationContexts)

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'lh_dcm_viewer.settings')
django.setup()

from dcm_app.models import DCMFile, DCMFileException
def _setup_argparser():

parser = argparse.ArgumentParser(
description="The getscp application implements a Service Class "
"Provider (SCP) for the Query/Retrieve (QR) Service Class "
"and the Basic Worklist Management (BWM) Service Class. "
"getscp only supports query functionality using the C-GET "
"message. It receives query keys from an SCU and sends a "
"response. The application can be used to test SCUs of the "
"QR and BWM Service Classes.",
usage="getscp [options] port")
# Parameters
# Transfer Syntaxes
ts_opts = parser.add_argument_group('Preferred Transfer Syntaxes')
ts_opts.add_argument("--type",
help="prefer explicit VR local byte order (default)")
ts_opts.add_argument("--detect_transfer_syntax",
help="Detect transfer syntax")
ts_opts.add_argument("--port",
help="port at which the SCP listens")

return parser.parse_args()

args = _setup_argparser()

ae = AE(ae_title=b'MY_ECHO_SCP', port=int(args.port))
if args.type == "jpeg_lossless":
ae.add_supported_context('1.2.840.10008.1.2.4.57')
elif args.type == "implicit":
ae.add_supported_context('1.2.840.10008.1.2')
print("ImplicitVRLittleEndian")
elif args.type == "explicit":
ae.add_supported_context('1.2.840.10008.1.2.1')

ae.requested_contexts = ttt
ae.supported_contexts = ttt
DICOM_IP = '192.168.1.11'
DICOM_IP = '127.0.0.1'
DICOM_PORT = 5678

def save_file(dataset, context, info):

try:
random_str = uuid.uuid4().hex
meta = Dataset()
meta.MediaStorageSOPClassUID = dataset.SOPClassUID
meta.MediaStorageSOPInstanceUID = dataset.SOPInstanceUID
meta.ImplementationClassUID = pynetdicom_uid_prefix
meta.FileMetaInformationGroupLength = 202

received_file_path = "../received_dcms/%s.dcm" % random_str
dataset_vr = None
try:
dataset_vr = dataset[("6000", "3000")].VR
except KeyError:
pass
print(dataset_vr)
if args.type == "implicit" or dataset_vr == "OB or OW":

ds = FileDataset(received_file_path, {}, file_meta=meta, preamble=b"" * 128)
ds.update(dataset)
ds.is_little_endian = True
ds.is_implicit_VR = True
if(dataset_vr == "OB or OW"):
print("forced ImplicitVRLittleEndian")
ds.file_meta.TransferSyntaxUID = ImplicitVRLittleEndian
elif args.type == "jpeg_lossless":
ds = FileDataset(received_file_path, {}, file_meta=meta, preamble=b"" * 128)
ds.update(dataset)
ds.is_little_endian = True
ds.is_implicit_VR = False
ds.file_meta.TransferSyntaxUID = JPEGLossless
ds.is_explicit_VR = True
elif args.type == "explicit":
meta.TransferSyntaxUID = "1.2.840.10008.1.2.1"
ds = FileDataset(received_file_path, {}, file_meta=meta, preamble=b"" * 128)
ds.update(dataset)
ds.is_little_endian = True
ds.is_implicit_VR = False
ds.file_meta.TransferSyntaxUID = ExplicitVRLittleEndian
ds.is_explicit_VR = True
ds.save_as(received_file_path)
f = open(received_file_path, "rb")
f.close()
return 0XC200
return status
except Exception as e:
logger.error(e)

ae.on_c_store = save_file
ae.start()

Answer 1

我不想把你送走，但这是一个非常专业的工具，它有自己的支持社区。我查找了您的问题，发现这可能是一个错误。有一个用户遇到了类似的问题，他说如果他使用旧版本的库，传输语法不会丢失。

类似问题： https://groups.google.com/forum/#!topic/pydicom/Oxd7cbCwseU

可在此处找到对此库的支持： https://groups.google.com/forum/#!forum/pydicom

代码本身在 GitHub 上维护，您可以在其中打开错误报告并查看所有其他错误报告：https://github.com/pydicom/pydicom/issues