Search Results for author: Shekhar S. Chandra

Found 30 papers, 8 papers with code

Machine Learning Applications in Traumatic Brain Injury: A Spotlight on Mild TBI

no code implementations8 Jan 2024 Hanem Ellethy, Shekhar S. Chandra, Viktor Vegh

As such, we review the state-of-the-art Machine Learning (ML) techniques applied to clinical information and CT scans in TBI, with a particular focus on mTBI.

Computed Tomography (CT)

Enhancing mTBI Diagnosis with Residual Triplet Convolutional Neural Network Using 3D CT

no code implementations23 Nov 2023 Hanem Ellethy, Shekhar S. Chandra, Viktor Vegh

To address these challenges, we propose a Residual Triplet Convolutional Neural Network (RTCNN) model to distinguish between mTBI cases and healthy ones by embedding 3D CT scans into a feature space.

Computed Tomography (CT) Decision Making +2

Single Image Compressed Sensing MRI via a Self-Supervised Deep Denoising Approach

no code implementations22 Nov 2023 Marlon Bran Lorenzana, Feng Liu, Shekhar S. Chandra

Popular methods in compressed sensing (CS) are dependent on deep learning (DL), where large amounts of data are used to train non-linear reconstruction models.

Denoising Image Compressed Sensing

Multi-scale MRI reconstruction via dilated ensemble networks

no code implementations7 Oct 2023 Wendi Ma, Marlon Bran Lorenzana, Wei Dai, Hongfu Sun, Shekhar S. Chandra

As aliasing artefacts are highly structural and non-local, many MRI reconstruction networks use pooling to enlarge filter coverage and incorporate global context.

MRI Reconstruction

Interpretable 3D Multi-Modal Residual Convolutional Neural Network for Mild Traumatic Brain Injury Diagnosis

no code implementations22 Sep 2023 Hanem Ellethy, Viktor Vegh, Shekhar S. Chandra

Notably, in comparison to the CT-based Residual Convolutional Neural Network (RCNN) model, the MRCNN shows an improvement of 4. 4% in specificity and 9. 0% in accuracy.

Computed Tomography (CT) Specificity

Ugly Ducklings or Swans: A Tiered Quadruplet Network with Patient-Specific Mining for Improved Skin Lesion Classification

no code implementations18 Sep 2023 Nathasha Naranpanawa, H. Peter Soyer, Adam Mothershaw, Gayan K. Kulatilleke, ZongYuan Ge, Brigid Betz-Stablein, Shekhar S. Chandra

An ugly duckling is an obviously different skin lesion from surrounding lesions of an individual, and the ugly duckling sign is a criterion used to aid in the diagnosis of cutaneous melanoma by differentiating between highly suspicious and benign lesions.

Lesion Classification Metric Learning +1

Fractal Compressive Sensing

no code implementations15 Sep 2023 Marlon Bran Lorenzana, Benjamin Cottier, Matthew Marques, Andrew Kingston, Shekhar S. Chandra

Compare reconstruction quality of the sampling schemes under various reconstruction strategies to determine the suitability of p. frac for CS-MRI.

Compressive Sensing

Application of Machine Learning in Melanoma Detection and the Identification of 'Ugly Duckling' and Suspicious Naevi: A Review

no code implementations1 Sep 2023 Fatima Al Zegair, Nathasha Naranpanawa, Brigid Betz-Stablein, Monika Janda, H. Peter Soyer, Shekhar S. Chandra

As lesions within the same individual typically share similarities and follow a predictable pattern, an ugly duckling naevus stands out as unusual and may indicate the presence of a cancerous melanoma.

Decision Making Skin Cancer Classification

TriFormer: A Multi-modal Transformer Framework For Mild Cognitive Impairment Conversion Prediction

no code implementations14 Jul 2023 Linfeng Liu, Junyan Lyu, Siyu Liu, Xiaoying Tang, Shekhar S. Chandra, Fatima A. Nasrallah

The prediction of mild cognitive impairment (MCI) conversion to Alzheimer's disease (AD) is important for early treatment to prevent or slow the progression of AD.

Evidence-aware multi-modal data fusion and its application to total knee replacement prediction

no code implementations24 Mar 2023 Xinwen Liu, Jing Wang, S. Kevin Zhou, Craig Engstrom, Shekhar S. Chandra

For each branch, there is an evidence network that takes the extracted features as input and outputs an evidence score, which is designed to represent the reliability of the output from the current branch.

Explainable Semantic Medical Image Segmentation with Style

no code implementations10 Mar 2023 Wei Dai, Siyu Liu, Craig B. Engstrom, Shekhar S. Chandra

The discriminator is generalised to small domain shifts as much as permissible by the training data, and the generator automatically diversifies the training samples using a manifold of input features learnt during segmentation.

Image Segmentation Medical Image Segmentation +2

Towards Trustable Skin Cancer Diagnosis via Rewriting Model's Decision

no code implementations CVPR 2023 Siyuan Yan, Zhen Yu, Xuelin Zhang, Dwarikanath Mahapatra, Shekhar S. Chandra, Monika Janda, Peter Soyer, ZongYuan Ge

We introduce a human-in-the-loop framework in the model training process such that users can observe and correct the model's decision logic when confounding behaviors happen.

Decision Making

AliasNet: Alias Artefact Suppression Network for Accelerated Phase-Encode MRI

no code implementations17 Feb 2023 Marlon E. Bran Lorenzana, Shekhar S. Chandra, Feng Liu

Sparse reconstruction is an important aspect of MRI, helping to reduce acquisition time and improve spatial-temporal resolution.

Denoising SSIM

NBC-Softmax : Darkweb Author fingerprinting and migration tracking

1 code implementation15 Dec 2022 Gayan K. Kulatilleke, Shekhar S. Chandra, Marius Portmann

An author style detection task is a metric learning problem, where learning style features with small intra-class variations and larger inter-class differences is of great importance to achieve better performance.

Metric Learning

Automated anomaly-aware 3D segmentation of bones and cartilages in knee MR images from the Osteoarthritis Initiative

1 code implementation30 Nov 2022 Boyeong Woo, Craig Engstrom, William Baresic, Jurgen Fripp, Stuart Crozier, Shekhar S. Chandra

A second anomaly-aware network, which was compared to anomaly-na\"ive segmentation networks, was used to provide a final automated segmentation of the femoral, tibial and patellar bones and cartilages from the knee MR images containing a spectrum of bone anomalies.

Anomaly Detection Segmentation +2

Cascaded Multi-Modal Mixing Transformers for Alzheimer's Disease Classification with Incomplete Data

no code implementations1 Oct 2022 Linfeng Liu, Siyu Liu, Lu Zhang, Xuan Vinh To, Fatima Nasrallah, Shekhar S. Chandra

The model uses a novel Cascaded Modality Transformer architecture with cross-attention to incorporate multi-modal information for more informed predictions.

Efficient block contrastive learning via parameter-free meta-node approximation

1 code implementation28 Sep 2022 Gayan K. Kulatilleke, Marius Portmann, Shekhar S. Chandra

In this work, we propose a meta-node based approximation technique that can (a) proxy all negative combinations (b) in quadratic cluster size time complexity, (c) at graph level, not node level, and (d) exploit graph sparsity.

Contrastive Learning Graph Clustering

Skin Lesion Recognition with Class-Hierarchy Regularized Hyperbolic Embeddings

no code implementations13 Sep 2022 Zhen Yu, Toan Nguyen, Yaniv Gal, Lie Ju, Shekhar S. Chandra, Lei Zhang, Paul Bonnington, Victoria Mar, Zhiyong Wang, ZongYuan Ge

Accordingly, the learned prototypes preserve the semantic class relations in the embedding space and we can predict the label of an image by assigning its feature to the nearest hyperbolic class prototype.

SCGC : Self-Supervised Contrastive Graph Clustering

1 code implementation27 Apr 2022 Gayan K. Kulatilleke, Marius Portmann, Shekhar S. Chandra

We also propose SCGC*, with a more effective, novel, Influence Augmented Contrastive (IAC) loss to fuse richer structural information, and half the original model parameters.

Clustering Graph Clustering

Transformer Compressed Sensing via Global Image Tokens

1 code implementation24 Mar 2022 Marlon Bran Lorenzana, Craig Engstrom, Shekhar S. Chandra

To showcase this development, we replace CNN components in a well-known CS-MRI neural network with TNN blocks and demonstrate the improvements afforded by KD.

Inductive Bias

Undersampled MRI Reconstruction with Side Information-Guided Normalisation

no code implementations7 Mar 2022 Xinwen Liu, Jing Wang, Cheng Peng, Shekhar S. Chandra, Feng Liu, S. Kevin Zhou

In this paper, we investigate the use of such side information as normalisation parameters in a convolutional neural network (CNN) to improve undersampled MRI reconstruction.

MRI Reconstruction

Automated volumetric and statistical shape assessment of cam-type morphology of the femoral head-neck region from 3D magnetic resonance images

no code implementations6 Dec 2021 Jessica M. Bugeja, Ying Xia, Shekhar S. Chandra, Nicholas J. Murphy, Jillian Eyles, Libby Spiers, Stuart Crozier, David J. Hunter, Jurgen Fripp, Craig Engstrom

Automated analyses of 3D MR images from patients with FAI using the CamMorph pipeline showed that, in comparison with female patients, male patients had significantly greater cam volume, surface area and height.

Segmentation

FDGATII : Fast Dynamic Graph Attention with Initial Residual and Identity Mapping

1 code implementation21 Oct 2021 Gayan K. Kulatilleke, Marius Portmann, Ryan Ko, Shekhar S. Chandra

While Graph Neural Networks have gained popularity in multiple domains, graph-structured input remains a major challenge due to (a) over-smoothing, (b) noisy neighbours (heterophily), and (c) the suspended animation problem.

Fairness Graph Attention +1

CAN3D: Fast 3D Medical Image Segmentation via Compact Context Aggregation

no code implementations12 Sep 2021 Wei Dai, Boyeong Woo, Siyu Liu, Matthew Marques, Craig B. Engstrom, Peter B. Greer, Stuart Crozier, Jason A. Dowling, Shekhar S. Chandra

Direct automatic segmentation of objects from 3D medical imaging, such as magnetic resonance (MR) imaging, is challenging as it often involves accurately identifying a number of individual objects with complex geometries within a large volume under investigation.

Image Segmentation Medical Image Segmentation +1

Bespoke Fractal Sampling Patterns for Discrete Fourier Space via the Kaleidoscope Transform

no code implementations2 Aug 2021 Jacob M. White, Stuart Crozier, Shekhar S. Chandra

Sampling strategies are important for sparse imaging methodologies, especially those employing the discrete Fourier transform (DFT).

Deep Simultaneous Optimisation of Sampling and Reconstruction for Multi-contrast MRI

no code implementations31 Mar 2021 Xinwen Liu, Jing Wang, Fangfang Tang, Shekhar S. Chandra, Feng Liu, Stuart Crozier

MRI images of the same subject in different contrasts contain shared information, such as the anatomical structure.

SSIM

Manipulating Medical Image Translation with Manifold Disentanglement

no code implementations27 Nov 2020 Siyu Liu, Jason A. Dowling, Craig Engstrom, Peter B. Greer, Stuart Crozier, Shekhar S. Chandra

In this work, we propose Manifold Disentanglement Generative Adversarial Network (MDGAN), a novel image translation framework that explicitly models these two types of features.

Disentanglement Generative Adversarial Network +1

Generalisable 3D Fabric Architecture for Streamlined Universal Multi-Dataset Medical Image Segmentation

1 code implementation28 Jun 2020 Siyu Liu, Wei Dai, Craig Engstrom, Jurgen Fripp, Stuart Crozier, Jason A. Dowling, Shekhar S. Chandra

However, medical image datasets have diverse-sized images and features, and developing a model simultaneously for multiple datasets is challenging.

Anatomy Image Segmentation +4

Fully automatic computer-aided mass detection and segmentation via pseudo-color mammograms and Mask R-CNN

1 code implementation28 Jun 2019 Hang Min, Devin Wilson, Yinhuang Huang, Siyu Liu, Stuart Crozier, Andrew P. Bradley, Shekhar S. Chandra

We propose a fully-integrated computer-aided detection (CAD) system for simultaneous mammographic mass detection and segmentation without user intervention.

Image Generation Segmentation +1

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