no code implementations • 14 Jun 2024 • Alper Güngör, Bahri Batuhan Bilecen, Tolga Çukur
Here, we address the optimal conditioning of diffusion models for solving challenging inverse problems that arise during image reconstruction.
1 code implementation • 22 May 2024 • Omer F. Atli, Bilal Kabas, Fuat Arslan, Mahmut Yurt, Onat Dalmaz, Tolga Çukur
In recent years, deep learning models comprising transformer components have pushed the performance envelope in medical image synthesis tasks.
1 code implementation • 10 May 2024 • Fuat Arslan, Bilal Kabas, Onat Dalmaz, Muzaffer Ozbey, Tolga Çukur
Here, we propose a novel self-consistent recursive diffusion bridge (SelfRDB) for improved performance in medical image translation.
no code implementations • 9 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.
no code implementations • 20 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).
1 code implementation • 2 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.
1 code implementation • 18 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.
2 code implementations • 18 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.
1 code implementation • 6 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.
no code implementations • 1 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.
1 code implementation • 26 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.
no code implementations • 1 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.
1 code implementation • 17 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.
Ranked #7 on Image-to-Image Translation on IXI
1 code implementation • 13 Jul 2022 • Onat Dalmaz, Usama Mirza, Gökberk Elmas, Muzaffer Özbey, Salman UH Dar, Emir Ceyani, Salman Avestimehr, Tolga Çukur
As such, pFLSynth enables training of a unified synthesis model that can reliably generalize across multiple sites and translation tasks.
1 code implementation • 12 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.
1 code implementation • 23 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.
1 code implementation • 8 Feb 2022 • Gokberk Elmas, Salman UH Dar, Yilmaz Korkmaz, Emir Ceyani, Burak Susam, Muzaffer Özbey, Salman Avestimehr, Tolga Çukur
Specificity in the prior is preserved via a mapper subnetwork that produces site-specific latents.
2 code implementations • 3 Nov 2021 • Alper Güngör, Baris Askin, Damla Alptekin Soydan, Emine Ulku Saritas, Can Barış Top, Tolga Çukur
Magnetic particle imaging (MPI) offers exceptional contrast for magnetic nanoparticles (MNP) at high spatio-temporal resolution.
2 code implementations • 30 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.}
Ranked #1 on Image-to-Image Translation on IXI
no code implementations • 6 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.
1 code implementation • 15 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.
no code implementations • 13 Mar 2021 • Salman Ul Hassan Dar, Mahmut Yurt, Tolga Çukur
Deep neural networks (DNNs) have recently found emerging use in accelerated MRI reconstruction.
no code implementations • 18 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.
no code implementations • 29 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.
no code implementations • 27 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.
no code implementations • 25 Sep 2019 • Mahmut Yurt, Salman Ul Hassan Dar, Aykut Erdem, Erkut Erdem, Tolga Çukur
Multi-contrast MRI protocols increase the level of morphological information available for diagnosis.
1 code implementation • 1 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.
no code implementations • 27 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.
no code implementations • 3 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.
2 code implementations • 5 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.
no code implementations • 7 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.