SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Wang Chunliang) srt2:(2015-2019)"

Sökning: WFRF:(Wang Chunliang) > (2015-2019)

  • Resultat 1-10 av 42
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • Bernard, Olivier, et al. (författare)
  • Standardized evaluation system for left ventricular segmentation algorithms in 3D echocardiography.
  • 2016
  • Ingår i: IEEE Transactions on Medical Imaging. - : Institute of Electrical and Electronics Engineers (IEEE). - 0278-0062 .- 1558-254X. ; 35:4, s. 967-977
  • Tidskriftsartikel (refereegranskat)abstract
    • Real-time 3D Echocardiography (RT3DE) has been proven to be an accurate tool for left ventricular (LV) volume assessment. However, identification of the LV endocardium remains a challenging task, mainly because of the low tissue/blood contrast of the images combined with typical artifacts. Several semi and fully automatic algorithms have been proposed for segmenting the endocardium in RT3DE data in order to extract relevant clinical indices, but a systematic and fair comparison between such methods has so far been impossible due to the lack of a publicly available common database. Here, we introduce a standardized evaluation framework to reliably evaluate and compare the performance of the algorithms developed to segment the LV border in RT3DE. A database consisting of 45 multivendor cardiac ultrasound recordings acquired at different centers with corresponding reference measurements from 3 experts are made available. The algorithms from nine research groups were quantitatively evaluated and compared using the proposed online platform. The results showed that the best methods produce promising results with respect to the experts' measurements for the extraction of clinical indices, and that they offer good segmentation precision in terms of mean distance error in the context of the experts' variability range. The platform remains open for new submissions.
  •  
2.
  • Wang, Chunliang, et al. (författare)
  • Automatic heart and vessel segmentation using random forests and a local phase guided level set method
  • 2017
  • Ingår i: Reconstruction, Segmentation, and Analysis Of Medical Images. - Cham : Springer Verlag. - 9783319522791 ; , s. 159-164
  • Konferensbidrag (refereegranskat)abstract
    • In this report, a novel automatic heart and vessel segmentation method is proposed. The heart segmentation pipeline consists of three major steps: heart localization using landmark detection, heart isolation using statistical shape model and myocardium segmentation using learning based voxel classification and local phase analysis. In our preliminary test, the proposed method achieved encouraging results.
  •  
3.
  • Zhuang, Xiahai, et al. (författare)
  • Evaluation of algorithms for Multi-Modality Whole Heart Segmentation : An open-access grand challenge.
  • 2019
  • Ingår i: Medical Image Analysis. - : Elsevier BV. - 1361-8415 .- 1361-8423. ; 58
  • Tidskriftsartikel (refereegranskat)abstract
    • Knowledge of whole heart anatomy is a prerequisite for many clinical applications. Whole heart segmentation (WHS), which delineates substructures of the heart, can be very valuable for modeling and analysis of the anatomy and functions of the heart. However, automating this segmentation can be challenging due to the large variation of the heart shape, and different image qualities of the clinical data. To achieve this goal, an initial set of training data is generally needed for constructing priors or for training. Furthermore, it is difficult to perform comparisons between different methods, largely due to differences in the datasets and evaluation metrics used. This manuscript presents the methodologies and evaluation results for the WHS algorithms selected from the submissions to the Multi-Modality Whole Heart Segmentation (MM-WHS) challenge, in conjunction with MICCAI 2017. The challenge provided 120 three-dimensional cardiac images covering the whole heart, including 60 CT and 60 MRI volumes, all acquired in clinical environments with manual delineation. Ten algorithms for CT data and eleven algorithms for MRI data, submitted from twelve groups, have been evaluated. The results showed that the performance of CT WHS was generally better than that of MRI WHS. The segmentation of the substructures for different categories of patients could present different levels of challenge due to the difference in imaging and variations of heart shapes. The deep learning (DL)-based methods demonstrated great potential, though several of them reported poor results in the blinded evaluation. Their performance could vary greatly across different network structures and training strategies. The conventional algorithms, mainly based on multi-atlas segmentation, demonstrated good performance, though the accuracy and computational efficiency could be limited. The challenge, including provision of the annotated training data and the blinded evaluation for submitted algorithms on the test data, continues as an ongoing benchmarking resource via its homepage (www.sdspeople.fudan.edu.cn/zhuangxiahai/0/mmwhs/).
  •  
4.
  • Andersson, Malin, et al. (författare)
  • How to measure renal artery stenosis - a retrospective comparison of morphological measurement approaches in relation to hemodynamic significance
  • 2015
  • Ingår i: BMC Medical Imaging. - : BioMed Central. - 1471-2342 .- 1471-2342. ; 15
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Although it is well known that renal artery stenosis may cause renovascular hypertension, it is unclear how the degree of stenosis should best be measured in morphological images. The aim of this study was to determine which morphological measures from Computed Tomography Angiography (CTA) and Magnetic Resonance Angiography (MRA) are best in predicting whether a renal artery stenosis is hemodynamically significant or not. Methods: Forty-seven patients with hypertension and a clinical suspicion of renovascular hypertension were examined with CTA, MRA, captopril-enhanced renography (CER) and captopril test (Ctest). CTA and MRA images of the renal arteries were analyzed by two readers using interactive vessel segmentation software. The measures included minimum diameter, minimum area, diameter reduction and area reduction. In addition, two radiologists visually judged the diameter reduction without automated segmentation. The results were then compared using limits of agreement and intra-class correlation, and correlated with the results from CER combined with Ctest (which were used as standard of reference) using receiver operating characteristics (ROC) analysis. Results: A total of 68 kidneys had all three investigations (CTA, MRA and CER + Ctest), where 11 kidneys (16.2 %) got a positive result on the CER + Ctest. The greatest area under ROC curve (AUROC) was found for the area reduction on MRA, with a value of 0.91 (95 % confidence interval 0.82-0.99), excluding accessory renal arteries. As comparison, the AUROC for the radiologists' visual assessments on CTA and MRA were 0.90 (0.82-0.98) and 0.91 (0.83-0.99) respectively. None of the differences were statistically significant. Conclusions: No significant differences were found between the morphological measures in their ability to predict hemodynamically significant stenosis, but a tendency of MRA having higher AUROC than CTA. There was no significant difference between measurements made by the radiologists and measurements made with fuzzy connectedness segmentation. Further studies are required to definitely identify the optimal measurement approach.
  •  
5.
  • Astaraki, Mehdi, PhD Student, 1984-, et al. (författare)
  • Early survival prediction in non-small cell lung cancer from PET/CT images using an intra-tumor partitioning method
  • 2019
  • Ingår i: Physica medica (Testo stampato). - : Elsevier BV. - 1120-1797 .- 1724-191X. ; 60, s. 58-65
  • Tidskriftsartikel (refereegranskat)abstract
    • PurposeTo explore prognostic and predictive values of a novel quantitative feature set describing intra-tumor heterogeneity in patients with lung cancer treated with concurrent and sequential chemoradiotherapy.MethodsLongitudinal PET-CT images of 30 patients with non-small cell lung cancer were analysed. To describe tumor cell heterogeneity, the tumors were partitioned into one to ten concentric regions depending on their sizes, and, for each region, the change in average intensity between the two scans was calculated for PET and CT images separately to form the proposed feature set. To validate the prognostic value of the proposed method, radiomics analysis was performed and a combination of the proposed novel feature set and the classic radiomic features was evaluated. A feature selection algorithm was utilized to identify the optimal features, and a linear support vector machine was trained for the task of overall survival prediction in terms of area under the receiver operating characteristic curve (AUROC).ResultsThe proposed novel feature set was found to be prognostic and even outperformed the radiomics approach with a significant difference (AUROCSALoP = 0.90 vs. AUROCradiomic = 0.71) when feature selection was not employed, whereas with feature selection, a combination of the novel feature set and radiomics led to the highest prognostic values.ConclusionA novel feature set designed for capturing intra-tumor heterogeneity was introduced. Judging by their prognostic power, the proposed features have a promising potential for early survival prediction.
  •  
6.
  • Astaraki, Mehdi, PhD Student, 1984-, et al. (författare)
  • Multimodal brain tumor segmentation with normal appearance autoencoder
  • 2019
  • Ingår i: International MICCAI Brainlesion Workshop. - Cham : Springer Nature. ; , s. 316-323
  • Konferensbidrag (refereegranskat)abstract
    • We propose a hybrid segmentation pipeline based on the autoencoders’ capability of anomaly detection. To this end, we, first, introduce a new augmentation technique to generate synthetic paired images. Gaining advantage from the paired images, we propose a Normal Appearance Autoencoder (NAA) that is able to remove tumors and thus reconstruct realistic-looking, tumor-free images. After estimating the regions where the abnormalities potentially exist, a segmentation network is guided toward the candidate region. We tested the proposed pipeline on the BraTS 2019 database. The preliminary results indicate that the proposed model improved the segmentation accuracy of brain tumor subregions compared to the U-Net model. 
  •  
7.
  • Astaraki, Mehdi, PhD Student, 1984-, et al. (författare)
  • Normal appearance autoencoder for lung cancer detection and segmentation
  • 2019
  • Ingår i: International Conference on Medical Image Computing and Computer-Assisted Intervention. - Cham : Springer Nature. ; , s. 249-256
  • Konferensbidrag (refereegranskat)abstract
    • One of the major differences between medical doctor training and machine learning is that doctors are trained to recognize normal/healthy anatomy first. Knowing the healthy appearance of anatomy structures helps doctors to make better judgement when some abnormality shows up in an image. In this study, we propose a normal appearance autoencoder (NAA), that removes abnormalities from a diseased image. This autoencoder is semi-automatically trained using another partial convolutional in-paint network that is trained using healthy subjects only. The output of the autoencoder is then fed to a segmentation net in addition to the original input image, i.e. the latter gets both the diseased image and a simulated healthy image where the lesion is artificially removed. By getting access to knowledge of how the abnormal region is supposed to look, we hypothesized that the segmentation network could perform better than just being shown the original slice. We tested the proposed network on the LIDC-IDRI dataset for lung cancer detection and segmentation. The preliminary results show the NAA approach improved segmentation accuracy substantially in comparison with the conventional U-Net architecture. 
  •  
8.
  •  
9.
  • Bendazzoli, Simone, et al. (författare)
  • Automatic rat brain segmentation from MRI using statistical shape models and random forest
  • 2019
  • Ingår i: MEDICAL IMAGING 2019. - : SPIE-INT SOC OPTICAL ENGINEERING. - 9781510625464 - 9781510625457
  • Konferensbidrag (refereegranskat)abstract
    • In MRI neuroimaging, the shimming procedure is used before image acquisition to correct for inhomogeneity of the static magnetic field within the brain. To correctly adjust the field, the brain's location and edges must first be identified from quickly-acquired low resolution data. This process is currently carried out manually by an operator, which can be time-consuming and not always accurate. In this work, we implement a quick and automatic technique for brain segmentation to be potentially used during the shimming. Our method is based on two main steps. First, a random forest classifier is used to get a preliminary segmentation from an input MRI image. Subsequently, a statistical shape model of the brain, which was previously generated from ground-truth segmentations, is fitted to the output of the classifier to obtain a model-based segmentation mask. In this way, a-priori knowledge on the brain's shape is included in the segmentation pipeline. The proposed methodology was tested on low resolution images of rat brains and further validated on rabbit brain images of higher resolution. Our results suggest that the present method is promising for the desired purpose in terms of time efficiency, segmentation accuracy and repeatability. Moreover, the use of shape modeling was shown to be particularly useful when handling low-resolution data, which could lead to erroneous classifications when using only machine learning-based methods.
  •  
10.
  • Brusini, Irene, et al. (författare)
  • Changes in brain architecture are consistent with altered fear processing in domestic rabbits
  • 2018
  • Ingår i: Proceedings of the National Academy of Sciences of the United States of America. - : National Academy of Sciences. - 0027-8424 .- 1091-6490. ; 115:28, s. 7380-7385
  • Tidskriftsartikel (refereegranskat)abstract
    • The most characteristic feature of domestic animals is their change in behavior associated with selection for tameness. Here we show, using high-resolution brain magnetic resonance imaging in wild and domestic rabbits, that domestication reduced amygdala volume and enlarged medial prefrontal cortex volume, supporting that areas driving fear have lost volume while areas modulating negative affect have gained volume during domestication. In contrast to the localized gray matter alterations, white matter anisotropy was reduced in the corona radiata, corpus callosum, and the subcortical white matter. This suggests a compromised white matter structural integrity in projection and association fibers affecting both afferent and efferent neural flow, consistent with reduced neural processing. We propose that compared with their wild ancestors, domestic rabbits are less fearful and have an attenuated flight response because of these changes in brain architecture.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-10 av 42
Typ av publikation
tidskriftsartikel (22)
konferensbidrag (17)
bokkapitel (3)
Typ av innehåll
refereegranskat (40)
övrigt vetenskapligt/konstnärligt (2)
Författare/redaktör
Wang, Chunliang, 198 ... (33)
Smedby, Örjan, 1956- (14)
Smedby, Örjan, Profe ... (9)
Wang, Chunliang (9)
Smedby, Örjan (8)
Toma-Daşu, Iuliana (5)
visa fler...
Astaraki, Mehdi, PhD ... (4)
Frimmel, Hans (2)
Andersson, Leif (2)
Zhao, L. (1)
Caballero, J. (1)
Mukherjee, R. (1)
Ferreira, Daniel (1)
Cavallin, Lena (1)
Wahlund, Lars-Olof (1)
Westman, Eric (1)
Yang, Guang (1)
Wang, Q. (1)
Li, Lei (1)
Ourselin, Sébastien (1)
Fredriksson, M (1)
Persson, Anders (1)
Eriksson, Per (1)
Wang, Chen (1)
Fan, Shengchi (1)
Wu, Yiqun (1)
Karlsson, Per (1)
Carneiro, Miguel (1)
Blanco-Aguiar, Jose ... (1)
Villafuerte, Rafael (1)
Ferrand, Nuno (1)
Kahl, Fredrik, 1972 (1)
Dhooge, Jan (1)
Lindblad, Joakim (1)
Sun, Yi (1)
Rafati, Nima (1)
Persson, Mikael, 195 ... (1)
Belavy, Daniel L (1)
Sladoje, Nataša (1)
Rubin, Carl-Johan (1)
Andersson, Malin (1)
Jägervall, Karl (1)
Granerus, Göran (1)
Afonso, Sandra (1)
Shi, W. (1)
Foncubierta-Rodrigue ... (1)
Goksel, Orcun (1)
Bengtsson, Ewert (1)
Lundström, Claes, 19 ... (1)
Fransson, Sven Göran (1)
visa färre...
Lärosäte
Kungliga Tekniska Högskolan (42)
Linköpings universitet (8)
Uppsala universitet (4)
Karolinska Institutet (3)
Stockholms universitet (1)
Chalmers tekniska högskola (1)
Språk
Engelska (42)
Forskningsämne (UKÄ/SCB)
Teknik (29)
Medicin och hälsovetenskap (13)
Naturvetenskap (8)
Lantbruksvetenskap (1)
Samhällsvetenskap (1)

År

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy