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,标签 (0002,0010) 缺失。因为我没有那个标签,所以我无法检测传输语法是否是隐式 VR 小端、显式 VR 小端、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。由于缺少标签(0002、0010),是否有更好的方法来检测传输语法。下面是我使用来自 CT 机器的数据集保存 dcm 文件的代码。现在我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"\0" * 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"\0" * 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"\0" * 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()