Search Results for author: Tolga Çukur

Found 28 papers, 15 papers with code

HydraViT: Adaptive Multi-Branch Transformer for Multi-Label Disease Classification from Chest X-ray Images

no code implementations9 Oct 2023 Şaban Öztürk, M. Yiğit Turalı, Tolga Çukur

While CNNs were previously augmented with attention maps or spatial masks to guide focus on potentially critical regions, learning localization guidance under heterogeneity in the spatial distribution of pathology is challenging.

Multi-Label Classification

CalibFPA: A Focal Plane Array Imaging System based on Online Deep-Learning Calibration

no code implementations20 Sep 2023 Alper Güngör, M. Umut Bahceci, Yasin Ergen, Ahmet Sözak, O. Oner Ekiz, Tolga Yelboga, Tolga Çukur

In this study, we propose a novel compressive FPA system based on online deep-learning calibration of multiplexed LR measurements (CalibFPA).

Learning Fourier-Constrained Diffusion Bridges for MRI Reconstruction

1 code implementation2 Aug 2023 Muhammad U. Mirza, Onat Dalmaz, Hasan A. Bedel, Gokberk Elmas, Yilmaz Korkmaz, Alper Gungor, Salman UH Dar, Tolga Çukur

Instead of the target transformation from undersampled to fully-sampled data required for MRI reconstruction, common diffusion priors are trained to learn a task-agnostic transformation from an asymptotic start-point of Gaussian noise onto the finite end-point of fully-sampled data.

MRI Reconstruction

DreaMR: Diffusion-driven Counterfactual Explanation for Functional MRI

1 code implementation18 Jul 2023 Hasan Atakan Bedel, Tolga Çukur

Deep learning analyses have offered sensitivity leaps in detection of cognitive states from functional MRI (fMRI) measurements across the brain.

counterfactual Counterfactual Explanation +1

FD-Net: An Unsupervised Deep Forward-Distortion Model for Susceptibility Artifact Correction in EPI

2 code implementations18 Mar 2023 Abdallah Zaid Alkilani, Tolga Çukur, Emine Ulku Saritas

Unlike previous methods, FD-Net enforces the forward-distortions of the correct image in both PE directions to be consistent with the acquired reversed-PE image pair.

Computational Efficiency

Learning Deep MRI Reconstruction Models from Scratch in Low-Data Regimes

1 code implementation6 Jan 2023 Salman UH Dar, Şaban Öztürk, Muzaffer Özbey, Tolga Çukur

To alleviate error propagation, PSFNet combines its SS and SG priors via a novel parallel-stream architecture with learnable fusion parameters.

MRI Reconstruction Rolling Shutter Correction

A plug-in graph neural network to boost temporal sensitivity in fMRI analysis

no code implementations1 Jan 2023 Irmak Sivgin, Hasan A. Bedel, Şaban Öztürk, Tolga Çukur

Receiving brain regions as nodes and blood-oxygen-level-dependent (BOLD) signals as node inputs, the proposed GraphCorr method leverages a node embedder module based on a transformer encoder to capture temporally-windowed latent representations of BOLD signals.

Time Series Time Series Analysis

DEQ-MPI: A Deep Equilibrium Reconstruction with Learned Consistency for Magnetic Particle Imaging

1 code implementation26 Dec 2022 Alper Güngör, Baris Askin, Damla Alptekin Soydan, Can Barış Top, Emine Ulku Saritas, Tolga Çukur

The ill-posed reconstruction problem can be solved by simultaneously enforcing data consistency based on the SM and regularizing the solution based on an image prior.

Rolling Shutter Correction

Unsupervised Simplification of Legal Texts

no code implementations1 Sep 2022 Mert Cemri, Tolga Çukur, Aykut Koç

While a recent study proposed a rule-based TS method for legal text, learning-based TS in the legal domain has not been considered previously.

Sentence Text Simplification

Unsupervised Medical Image Translation with Adversarial Diffusion Models

1 code implementation17 Jul 2022 Muzaffer Özbey, Onat Dalmaz, Salman UH Dar, Hasan A Bedel, Şaban Özturk, Alper Güngör, Tolga Çukur

Extensive assessments are reported on the utility of SynDiff against competing GAN and diffusion models in multi-contrast MRI and MRI-CT translation.

Image-to-Image Translation Imputation +1

Adaptive Diffusion Priors for Accelerated MRI Reconstruction

1 code implementation12 Jul 2022 Alper Güngör, Salman UH Dar, Şaban Öztürk, Yilmaz Korkmaz, Gokberk Elmas, Muzaffer Özbey, Tolga Çukur

A two-phase reconstruction is executed following training: a rapid-diffusion phase that produces an initial reconstruction with the trained prior, and an adaptation phase that further refines the result by updating the prior to minimize data-consistency loss.

De-aliasing MRI Reconstruction

BolT: Fused Window Transformers for fMRI Time Series Analysis

1 code implementation23 May 2022 Hasan Atakan Bedel, Irmak Şıvgın, Onat Dalmaz, Salman Ul Hassan Dar, Tolga Çukur

Encoding is performed on temporally-overlapped windows within the time series to capture local representations.

Time Series Time Series Analysis

ResViT: Residual vision transformers for multi-modal medical image synthesis

2 code implementations30 Jun 2021 Onat Dalmaz, Mahmut Yurt, Tolga Çukur

Here, we propose a novel generative adversarial approach for medical image synthesis, ResViT, that leverages the contextual sensitivity of vision transformers along with the precision of convolution operators and realism of adversarial learning.}

Image-to-Image Translation Inductive Bias

Constrained Ellipse Fitting for Efficient Parameter Mapping with Phase-cycled bSSFP MRI

no code implementations6 Jun 2021 Kübra Keskin, Uğur Yılmaz, Tolga Çukur

CELF is based on the elliptical signal model framework for complex bSSFP signals; and it introduces geometrical constraints on ellipse properties to improve estimation efficiency, and dictionary-based identification to improve estimation accuracy.

Anatomy

Unsupervised MRI Reconstruction via Zero-Shot Learned Adversarial Transformers

1 code implementation15 May 2021 Yilmaz Korkmaz, Salman UH Dar, Mahmut Yurt, Muzaffer Özbey, Tolga Çukur

Supervised reconstruction models are characteristically trained on matched pairs of undersampled and fully-sampled data to capture an MRI prior, along with supervision regarding the imaging operator to enforce data consistency.

MRI Reconstruction

Three Dimensional MR Image Synthesis with Progressive Generative Adversarial Networks

no code implementations18 Dec 2020 Muzaffer Özbey, Mahmut Yurt, Salman Ul Hassan Dar, Tolga Çukur

Mainstream deep models for three-dimensional MRI synthesis are either cross-sectional or volumetric depending on the input.

Image Generation

Semi-Supervised Learning of Mutually Accelerated MRI Synthesis without Fully-Sampled Ground Truths

no code implementations29 Nov 2020 Mahmut Yurt, Salman Ul Hassan Dar, Muzaffer Özbey, Berk Tınaz, Kader Karlı Oğuz, Tolga Çukur

Here, we propose a novel semi-supervised deep generative model that instead learns to recover high-quality target images directly from accelerated acquisitions of source and target contrasts.

Progressively Volumetrized Deep Generative Models for Data-Efficient Contextual Learning of MR Image Recovery

no code implementations27 Nov 2020 Mahmut Yurt, Muzaffer Özbey, Salman Ul Hassan Dar, Berk Tınaz, Kader Karlı Oğuz, Tolga Çukur

Comprehensive demonstrations on mainstream MRI reconstruction and synthesis tasks show that ProvoGAN yields superior performance to state-of-the-art volumetric and cross-sectional models.

Anatomy MRI Reconstruction

Scalable Learning-Based Sampling Optimization for Compressive Dynamic MRI

1 code implementation1 Feb 2019 Thomas Sanchez, Baran Gözcü, Ruud B. van Heeswijk, Armin Eftekhari, Efe Ilıcak, Tolga Çukur, Volkan Cevher

Compressed sensing applied to magnetic resonance imaging (MRI) allows to reduce the scanning time by enabling images to be reconstructed from highly undersampled data.

Synergistic Reconstruction and Synthesis via Generative Adversarial Networks for Accelerated Multi-Contrast MRI

no code implementations27 May 2018 Salman Ul Hassan Dar, Mahmut Yurt, Mohammad Shahdloo, Muhammed Emrullah Ildız, Tolga Çukur

The proposed method preserves high-frequency details of the target contrast by relying on the shared high-frequency information available from the source contrast, and prevents feature leakage or loss by relying on the undersampled acquisitions of the target contrast.

Anatomy

Learning-Based Compressive MRI

no code implementations3 May 2018 Baran Gözcü, Rabeeh Karimi Mahabadi, Yen-Huan Li, Efe Ilıcak, Tolga Çukur, Jonathan Scarlett, Volkan Cevher

In the area of magnetic resonance imaging (MRI), an extensive range of non-linear reconstruction algorithms have been proposed that can be used with general Fourier subsampling patterns.

Anatomy Learning Theory

Image Synthesis in Multi-Contrast MRI with Conditional Generative Adversarial Networks

2 code implementations5 Feb 2018 Salman Ul Hassan Dar, Mahmut Yurt, Levent Karacan, Aykut Erdem, Erkut Erdem, Tolga Çukur

The proposed approach preserves high-frequency details via an adversarial loss; and it offers enhanced synthesis performance via a pixel-wise loss for registered multi-contrast images and a cycle-consistency loss for unregistered images.

Anatomy Image Generation

A Transfer-Learning Approach for Accelerated MRI using Deep Neural Networks

no code implementations7 Oct 2017 Salman Ul Hassan Dar, Muzaffer Özbey, Ahmet Burak Çatlı, Tolga Çukur

Methods: Neural networks were trained on thousands of samples from public datasets of either natural images or brain MR images.

4k MRI Reconstruction +1

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