Contrast-free identification of glioma blood-brain barrier status via generative diffusion AI and non-contrast MRI.
The 6 matches
- [1] § Methods › Experimental setting ↔ main/train_CBSI_ide.py, lines 22–148 · score 0.81 · weight decay, identification model, Adam, cosine, setup, warm
- [2] § Methods › Image preprocessing and postprocessing ↔ preprocess/Preprocess_grayscale_norm.py, lines 8–40 · score 0.73 · binary brain mask, preprocessing grayscale, background, voxel, volumes, MRI
- [3] § Methods › Network architecture ↔ main/models/Networks_gen/Networks_simple_UNet_DDPM.py, lines 121–255 · score 0.53 · ReLU, upsampling, downsample, embeddings, activation, blocks
- [4] § Methods › Metrics ↔ main/models/Networks_gen/Validation_inference.py, lines 15–151 · score 0.52 · synthetic images, PSNR, SSIM, metrics, T1Gd, MAE
- [5] § Results › Performance on the identification of BBB status ↔ main/train_CBSI_ide.py, lines 22–148 · score 0.52 · precision recall, identification model, ROC, trained, CBSI
- [6] § Results › Performance on T1Gd synthesis ↔ main/Nii_utils.py, lines 151–168 · score 0.51 · absolute error, ground truth, MAE
Paper
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The authors' code
Python · 231 lines · 11 KB · MIT · 2 matches
- import os
- import time
- import glob
- import math
- import argparse
- from tqdm import tqdm
- import torch.nn as nn
- import torch.optim as optim
- from datetime import datetime
- from torch.utils.data import DataLoader
- from torch.optim.lr_scheduler import MultiStepLR
- from torch.utils.tensorboard import SummaryWriter
- from sklearn.metrics import roc_auc_score, precision_recall_fscore_support
- from Nii_utils import *
- from dataset.Dataset_ide import Dataset_harmonize_2D_t1_t2f_t1c
- from models.Networks_ide.model import EfficientNet
- from models.Networks_ide.Validation_inference import Model_Validation, Model_Inference
- def main(opt):
- train_writer = SummaryWriter(join(opt.save_dir, 'log/train'), flush_secs=2)
- val_writer = SummaryWriter(join(opt.save_dir, 'log/val'), flush_secs=2)
- print(opt.save_dir)
- # -------------- Identification Model Setup ----------------
- net = EfficientNet.from_name(model_name=f'efficientnet-{opt.model_name[-2:]}', in_channels=opt.inchannel, num_classes=opt.classes, dropout_rate=opt.drop).to(opt.device)
- # Load pretrained weights for EfficientNet
- net_weights = net.state_dict()
- pre_weights = torch.load(f'./main/models/Networks_ide/pretrain/efficientnet-b0-355c32eb.pth') # Download from the official website
- pre_dict = {k: v for k, v in pre_weights.items() if net_weights[k].numel() == v.numel()}
- net.load_state_dict(pre_dict, strict=False)
- print(f'The model is 2D {opt.model_name}')
- # ----------------------loss & optimizer------------------------
- criterion = nn.BCEWithLogitsLoss().to(opt.device) # Sigmoid-BCELoss
- optimizer = optim.Adam(net.parameters(), lr=opt.lr_max, weight_decay=5e-4)
- # -------------- Learning Rate Scheduler ----------------
- if opt.warmup:
- # warm_up_with_cosine_lr
- int_decay = opt.lr_min / opt.lr_max
- zoom = 1 - int_decay
- warm_up_with_cosine_lr = lambda \
- epoch: int_decay + epoch / opt.warm_up_epochs * zoom if epoch <= opt.warm_up_epochs else int_decay + zoom * 0.5 * (
- math.cos((epoch - opt.warm_up_epochs) / (opt.max_epoch - opt.warm_up_epochs) * math.pi) + 1)
- scheduler = torch.optim.lr_scheduler.LambdaLR(optimizer, lr_lambda=warm_up_with_cosine_lr)
- else:
- scheduler = MultiStepLR(optimizer, milestones=[int((1 / 3) * opt.max_epoch), int((2 / 3) * opt.max_epoch)], gamma=0.1, last_epoch=-1)
- # -------------- Dataset Setup ----------------
- ckpt_dir = join(opt.save_dir, 'train_model')
- os.makedirs(ckpt_dir, exist_ok=True)
- # ======== Load dataset and dataloader ========
- root_dir = './Glioma_DATA/Preprocessing_DATA/Train'
- val_dir = './Glioma_DATA/Preprocessing_DATA/Val'
- train_set = Dataset_harmonize_2D_t1_t2f_t1c(opt, root_dir=root_dir, dataset='Train')
- val_set = Dataset_harmonize_2D_t1_t2f_t1c(opt, root_dir=val_dir, dataset='Val')
- train_loader = DataLoader(train_set, batch_size=opt.bs, shuffle=True, num_workers=opt.num_threads, drop_last=False)
- val_loader = DataLoader(val_set, batch_size=opt.val_bs, shuffle=False, num_workers=opt.num_threads, drop_last=False)
- print(f'Size of train_dataset:{len(train_set)}.')
- # print(f'Size of val_dataset:{len(val_set)}.')
- print('Data prepared.')
- # -------------- Metrics Init ----------------
- threshold = 0.5
- best_AUC, best_epoch = 0, 0
- Save_Parameter(opt)
- # ==================== Training Loop ====================
- print('Start training.')
- for epoch in tqdm(range(opt.max_epoch)):
- train_start_time = time.time()
- net.train()
- for param_group in optimizer.param_groups:
- lr = param_group['lr']
- break
- train_acc_list = []
- train_loss_list = []
- y_true = torch.tensor([]).to(opt.device)
- y_pred = torch.tensor([]).to(opt.device)
- y_binary = torch.tensor([]).to(opt.device)
- # ------------------ Batch Training ------------------
- for i, DATA in enumerate(train_loader):
- image = DATA['image'].to(opt.device)
- label = DATA['label'].to(opt.device)
- net.zero_grad()
- y = net(image)
- loss = criterion(y, label)
- # Optional flood loss
- if opt.do_flood:
- flood_loss = (loss - opt.flood).abs() + opt.flood
- flood_loss.backward()
- else:
- loss.backward()
- optimizer.step()
- # Metrics logging
- y = torch.sigmoid(y)
- y_binary = torch.cat([y_binary, (y.detach() > threshold)])
- y_true = torch.cat([y_true, label.detach()])
- y_pred = torch.cat([y_pred, y.detach()])
- hit = ((y.detach() < threshold) ^ label.bool()).sum()
- train_acc_list.append(np.array(hit.cpu()))
- train_loss_list.append(np.array(loss.detach().cpu()))
- scheduler.step()
- # Calculate epoch-level metrics
- train_loss = np.array(train_loss_list).mean()
- train_acc = np.array(train_acc_list).sum() / len(train_set)
- train_auc = roc_auc_score(y_true.cpu(), y_pred.cpu())
- train_precision, train_recall, train_F1_score, _ = precision_recall_fscore_support(y_true.int().cpu(),
- y_binary.int().cpu(),
- average='binary')
- # TensorBoard Logging
- train_writer.add_scalar('ide_lr', lr, epoch)
- train_writer.add_scalar('ide_loss', train_loss, epoch)
- train_writer.add_scalar('ide_AUC', train_auc, epoch)
- train_writer.add_scalar('ide_ACC', train_acc, epoch)
- train_writer.add_scalar('ide_F1_score', train_F1_score, epoch)
- train_writer.add_scalar('ide_time', (time.time() - train_start_time) / 60, epoch)
- train_writer.close()
- # ------------------ Validation Phase ------------------
- AUC_val, _ = Model_Validation(opt, epoch, net, {'val':val_loader}, dataset='val', save_dir=opt.save_dir, writer={'val':val_writer}, train=True, criterion=criterion)
- if AUC_val > best_AUC:
- try:
- os.remove(join(opt.save_dir, 'train_model', f'best_AUC_epoch{best_epoch}.pth'))
- except:
- pass
- best_epoch = epoch
- if epoch > 10:
- best_AUC = AUC_val
- torch.save(net.state_dict(),join(opt.save_dir, 'train_model', f'best_AUC_epoch{best_epoch}.pth'))
- torch.save(net.state_dict(),join(opt.save_dir, 'train_model', f'latest_epoch{epoch}.pth'))
- try:
- os.remove(join(opt.save_dir, 'train_model', f'latest_epoch{epoch - 1}.pth'))
- except:
- pass
- torch.save(net.state_dict(),join(opt.save_dir, 'train_model', 'final' + '.pth'))
- return net
- def pred(opt, net=None):
- if not net:
- net = EfficientNet.from_name(model_name=f'efficientnet-{opt.model_name[-2:]}', in_channels=opt.inchannel, num_classes=opt.classes, dropout_rate=opt.drop).to(opt.device)
- net.load_state_dict(torch.load(sorted(glob.glob(join(opt.save_dir, 'train_model', 'best_AUC_epoch*.pth')))[-1]), strict=True)
- val_dir = './Glioma_DATA/Preprocessing_DATA/Val'
- test_dir = './Glioma_DATA/Preprocessing_DATA/Test'
- with torch.no_grad():
- Model_Inference(opt, val_dir, net, dataset='Val', label_known=True)
- Model_Inference(opt, test_dir, net, dataset='Test', label_known=False)
- if __name__ == '__main__':
- parser = argparse.ArgumentParser()
- # -------------------- Training settings
- parser.add_argument('--gpu', type=str, default='0', help='which gpu is used')
- parser.add_argument('--seed', type=int, default=42, help='random seed')
- parser.add_argument('--max_epoch', type=int, default=100, help='all_epochs')
- parser.add_argument('--lr_min', type=float, default=1e-5, help='initial learning rate')
- parser.add_argument('--lr_max', type=float, default=5e-4, help='max learning rate')
- parser.add_argument('--bs', type=int, default=2, help='training input batch size')
- parser.add_argument('--num_threads', type=int, default=1, help='# threads for loading dataset')
- # -------------------- Inference settings
- parser.add_argument('--val_bs', type=int, default=4, help='Val/Test batch size')
- parser.add_argument('--ref_timestep', type=int, default=100, help='<=1000, 1000 is time-consuming but of higher quality')
- parser.add_argument('--save_dir', type=str, default='', help="./main/trained_models/CBSI_ide/{bs*_ImageSize*_epoch*_seed*_time}/") # Path for saving model parameters
- # -------------------- Data settings
- parser.add_argument('--data_dim', type=str, default='2D')
- parser.add_argument('--ImageSize', type=int, default=424, help='Spatial dimension cropped to 424 * 424')
- parser.add_argument("--gen_save_dir", type=str, default='', help="./main/trained_models/CBSI_gen/{pred_*_...class_seg_time}/")
- parser.add_argument('--MR_max', type=int, default=255, help='max value of preprocessed MR image')
- parser.add_argument('--MR_min', type=int, default=0, help='min value of preprocessed MR image')
- parser.add_argument('--preloading', type=bool, default=True, help='preloading the image')
- # -------------------- Model settings
- parser.add_argument('--model_name', type=str, default='EfficientNet_b0')
- parser.add_argument('--inchannel', type=int, default=3, help='input channel (T1, T2-FLAIR, and synthetic T1Gd)')
- parser.add_argument('--classes', type=int, default=1, help='')
- parser.add_argument('--drop', type=float, default=0.2, help='dropout rate 0~1 ')
- # -------------------- Loss function
- parser.add_argument('--do_flood', type=bool, default=True, help='do flood loss')
- parser.add_argument('--flood', type=float, default=0.1, help='flood loss threshold')
- parser.add_argument('--warmup', action='store_false')
- parser.add_argument('--warm_up_epochs', type=int, default=5, help='warm_up_epochs')
- # -------------------- Quick test settings
- parser.add_argument('--quick_test', action='store_true')
- parser.add_argument('--inference_only', action='store_true')
- opt = parser.parse_args()
- # torch.cuda.is_available = lambda: False
- os.environ["CUDA_VISIBLE_DEVICES"] = opt.gpu
- setup_seed(opt.seed)
- opt.device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
- print("CBSI_ide Start")
- if opt.quick_test:
- opt.max_epoch = 10
- opt.ref_timestep = 10
- # -------------- Experiment naming & directory setup --------------
- if not opt.save_dir or not opt.inference_only:
- current_time = datetime.now().strftime('%b%d_%H-%M-%S')
- opt.save_dir = './main/trained_models/CBSI_ide/bs{}_ImageSize{}_epoch{}_seed{}_{}'.format(opt.bs, opt.ImageSize, opt.max_epoch, opt.seed, current_time)
- os.makedirs(opt.save_dir, exist_ok=True)
- os.makedirs(opt.save_dir, exist_ok=True)
- if not opt.inference_only:
- net = main(opt)
- pred(opt, net)
- else:
- pred(opt)
- if not opt.inference_only:
- print("CBSI_ide Training Done")
- else:
- print("CBSI_ide Inference Done")
- print("-------------------------------------------")
- print(f"Attention !! Results can be viewed here :\n {opt.save_dir}")
- print("-------------------------------------------")
train_CBSI_ide.py at commit be829a1, under MIT · at the source
Overview
- School of Biomedical Engineering, Southern Medical University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Medical Image Processing, Guangzhou, China
- Guangdong Province Engineering Laboratory for Medical Imaging and Diagnostic Technology, Guangzhou, China
- Department of Biostatistics, School of Global Public Health, New York University, New York, USA
- Department of Radiology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- School of Life Science and Technology, Xi’an Jiaotong University, Xi’an, China
- Department of Medical Imaging Center, Nanfang Hospital, Southern Medical University, Guangzhou, China
Abstract
The abstract is not reproduced here: the paper's license (CC BY-NC-ND) does not allow it. Read it in the paper, at the publisher or on Europe PMC.
Repository
Its files are read in the Code ↔ Paper reader above, with 6 matches between paragraphs and lines of code.
SMU-MedicalVision/CBSI-master
be829a11c5a320e43c9211b2aa31b878bcd7c6c3, 23 July 2025Availability: 1 check, the latest on 30 September 2026: the link answers
- 30 September 2026: the link answers
22 files
- main/
Nii_utils.py , Python, 192 lines, 1 match - main/
__init__.py , Python, 1 line - main/
dataset/ , Python, 246 linesDataset_gen.py - main/
dataset/ , Python, 78 linesDataset_ide.py - main/
dataset/ , Python, 1 line__init__.py - main/
models/ , Python, 46 linesLossfunction.py - main/
models/ , Python, 470 linesNetworks_gen/ Networks_DDPM_trainer.py - main/
models/ , Python, 411 linesNetworks_gen/ Networks_UNet_DDPM.py - main/
models/ , Python, 349 lines, 1 matchNetworks_gen/ Networks_simple_UNet_DDP M.py - main/
models/ , Python, 223 lines, 1 matchNetworks_gen/ Validation_inference.py - main/
models/ , Python, 1 lineNetworks_gen/ __init__.py - main/
models/ , Python, 140 linesNetworks_ide/ Validation_inference.py - main/
models/ , Python, 9 linesNetworks_ide/ __init__.py - main/
models/ , Python, 469 linesNetworks_ide/ model.py - main/
models/ , Python, 1 lineNetworks_ide/ pretrain/ __init__.py - main/
models/ , Python, 618 linesNetworks_ide/ utils.py - main/
models/ , Python, 1 line__init__.py - main/
train_CBSI_gen.py , Python, 228 lines - main/
train_CBSI_ide.py , Python, 231 lines, 2 matches - preprocess/
Preprocess_grayscale_nor , Python, 216 lines, 1 matchm.py - LICENSE, License, 21 lines
- README.md, Text, 129 lines
Code availability statement
The paper has a code availability statement. Its license (CC BY-NC-ND) does not allow reproducing it here; in short, from what the harvester recognized in it:
- it points to the authors' code: SMU-MedicalVision/
CBSI-master
Read it in the paper: doi.org/10.1038/s41467-026-69578-8.
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What the map holds:
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- 20 scripts, each with its path and the digest of its content;
- 6 matches between paragraphs of the paper and lines of the code (method lexical-v1);
- neither the text of the paper nor the code itself.
Its JSON (tracing-map.json) is deposited on Zenodo with its DOI once the map is validated.
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Code and data availability statement
The paper has a code and data availability statement. Its license (CC BY-NC-ND) does not allow reproducing it here; in short, from what the harvester recognized in it:
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CBSI-master
Read it in the paper: doi.org/10.1038/s41467-026-69578-8.
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Version 1, 30 September 2026: the first record
Recorded: type, language, journal, volume, issue, pages, dates, 10 authors, 3 keywords, 9 MeSH terms, 1 funder, 33 references.
Cite
This paper
Zheng, K., Zhang, Y., Shu, H., Xiao, R., Li, X., Ma, J., Feng, Q., Wu, Y., Yang, W., & Zhong, L. (2026). Contrast-free identification of glioma blood-brain barrier status via generative diffusion AI and non-contrast MRI. Nature communications, 17(1), 2162. https://
BibTeX
@article{zheng2026contra
author = {Zheng, Kaiyi and Zhang, Yiwen and Shu, Hai and Xiao, Ruolin and Li, Xinming and Ma, Jianhua and Feng, Qianjin and Wu, Yuankui and Yang, Wei and Zhong, Liming},
title = {{Contrast-free identification of glioma blood-brain barrier status via generative diffusion AI and non-contrast MRI}},
journal = {Nature communications},
year = {2026},
month = mar,
volume = {17},
number = {1},
pages = {2162},
publisher = {Nature Publishing Group},
issn = {2041-1723},
doi = {10.1038/
url = {https://
pmid = {41776178},
pmcid = {PMC12960725}
}
RIS
TY - JOUR
AU - Zheng, Kaiyi
AU - Zhang, Yiwen
AU - Shu, Hai
AU - Xiao, Ruolin
AU - Li, Xinming
AU - Ma, Jianhua
AU - Feng, Qianjin
AU - Wu, Yuankui
AU - Yang, Wei
AU - Zhong, Liming
TI - Contrast-free identification of glioma blood-brain barrier status via generative diffusion AI and non-contrast MRI
T2 - Nature communications
J2 - Nat Commun
PY - 2026
DA - 2026/
VL - 17
IS - 1
SP - 2162
SN - 2041-1723
PB - Nature Publishing Group
DO - 10.1038/
UR - https://
LA - en
ER -
CSL-JSON
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"container-title": "Nature communications",
"author": [
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"family": "Zheng",
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"given": "Wei"
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"given": "Liming"
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"issued": {
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]
}
}
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