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  1. Article ; Online: Editorial for "Performance of C-SENSE Accelerated Rapid Liver Shear Stiffness Measurement Using Displacement Wave Polarity-Inversion Motion Encoding: An Evaluation Study".

    Karampinos, Dimitrios C

    Journal of magnetic resonance imaging : JMRI

    2022  Volume 56, Issue 3, Page(s) 766–767

    MeSH term(s) Elasticity Imaging Techniques ; Humans ; Liver/diagnostic imaging ; Motion
    Language English
    Publishing date 2022-03-03
    Publishing country United States
    Document type Editorial ; Comment
    ZDB-ID 1146614-5
    ISSN 1522-2586 ; 1053-1807
    ISSN (online) 1522-2586
    ISSN 1053-1807
    DOI 10.1002/jmri.28137
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    Zs.A 3648: Show issues Location:
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    Zs.MO 236: Show issues

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  2. Article ; Online: Editorial for "Low Unsaturated Fatty Acids Level in the Vertebral Bone Marrow of Postmenopausal Osteoporosis: A Pilot 2D iDQC-MRS on 3.0 T Study".

    Ruschke, Stefan / Karampinos, Dimitrios C

    Journal of magnetic resonance imaging : JMRI

    2022  Volume 57, Issue 5, Page(s) 1431–1432

    MeSH term(s) Female ; Humans ; Osteoporosis, Postmenopausal ; Bone Marrow ; Bone Density ; Magnetic Resonance Spectroscopy ; Fatty Acids, Unsaturated ; Spinal Fractures
    Chemical Substances Fatty Acids, Unsaturated
    Language English
    Publishing date 2022-08-30
    Publishing country United States
    Document type Editorial ; Comment
    ZDB-ID 1146614-5
    ISSN 1522-2586 ; 1053-1807
    ISSN (online) 1522-2586
    ISSN 1053-1807
    DOI 10.1002/jmri.28413
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  3. Article ; Online: Single-voxel short-TR multi-TI multi-TE STEAM MRS for water-fat relaxometry.

    Ruschke, Stefan / Karampinos, Dimitrios C

    Magnetic resonance in medicine

    2022  Volume 87, Issue 6, Page(s) 2587–2599

    Abstract: Purpose: To propose a short-TR multi-TI multi-TE (SHORTIE, ['shȯr-tē]) STEAM single-voxel MRS acquisition scheme for the simultaneous assessment of T: Methods: Theoretical analysis for multi-TI (TI = 10, 100, 500, 1500 ms; scan time = 2:43 minutes), ... ...

    Abstract Purpose: To propose a short-TR multi-TI multi-TE (SHORTIE, ['shȯr-tē]) STEAM single-voxel MRS acquisition scheme for the simultaneous assessment of T
    Methods: Theoretical analysis for multi-TI (TI = 10, 100, 500, 1500 ms; scan time = 2:43 minutes), multi-TE (TE = 12, 15, 20, 25 ms; scan time = 2:24 minutes), and SHORTIE STEAM (all TI and TE combinations; scan time = 2:52 minutes) was carried out including Cramér-Rao lower bound and parameter estimation efficiency analysis for T
    Results: Cramér-Rao lower bound analysis revealed similar to increased variances for T
    Conclusion: The SHORTIE STEAM acquisition allows shorter scan times for the simultaneous probing of relaxation properties and spectral content in the water-fat environment when compared with combined long-TR multi-TI, and long-TR multi-TE STEAM.
    MeSH term(s) Adipose Tissue/diagnostic imaging ; Humans ; Magnetic Resonance Imaging ; Phantoms, Imaging ; Water
    Chemical Substances Water (059QF0KO0R)
    Language English
    Publishing date 2022-01-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 605774-3
    ISSN 1522-2594 ; 0740-3194
    ISSN (online) 1522-2594
    ISSN 0740-3194
    DOI 10.1002/mrm.29157
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  4. Book ; Online ; Thesis: Magnetic Resonance Imaging of Bone with Ultrashort Echo Time

    Kronthaler, Sophia [Verfasser] / Karampinos, Dimitrios [Akademischer Betreuer] / Menze, Björn [Gutachter] / Oei, Edwin H. G. [Gutachter] / Karampinos, Dimitrios [Gutachter]

    2023  

    Author's details Sophia Kronthaler ; Gutachter: Björn Menze, Edwin H. G. Oei, Dimitrios Karampinos ; Betreuer: Dimitrios Karampinos
    Keywords Medizin, Gesundheit ; Medicine, Health
    Subject code sg610
    Language English
    Publisher Universitätsbibliothek der TU München
    Publishing place München
    Document type Book ; Online ; Thesis
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  5. Book ; Online ; Thesis: Quantitative Susceptibility Mapping Outside the Brain

    Böhm, Christof Andreas [Verfasser] / Karampinos, Dimitrios [Akademischer Betreuer] / Shmueli, Karin [Gutachter] / Herzen, Julia [Gutachter] / Karampinos, Dimitrios [Gutachter]

    2023  

    Author's details Christof Andreas Böhm ; Gutachter: Karin Shmueli, Julia Herzen, Dimitrios Karampinos ; Betreuer: Dimitrios Karampinos
    Keywords Medizin, Gesundheit ; Medicine, Health
    Subject code sg610
    Language English
    Publisher Universitätsbibliothek der TU München
    Publishing place München
    Document type Book ; Online ; Thesis
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  6. Book ; Online ; Thesis: Magnetic Resonance Imaging and Spectroscopy based Quantification of Proton Density Fat Fraction and Fatty Acid Composition

    Syväri, Jan [Verfasser] / Karampinos, Dimitrios [Akademischer Betreuer] / Schilling, Franz [Gutachter] / Karampinos, Dimitrios [Gutachter]

    2023  

    Author's details Jan Syväri ; Gutachter: Franz Schilling, Dimitrios Karampinos ; Betreuer: Dimitrios Karampinos
    Keywords Medizin, Gesundheit ; Medicine, Health
    Subject code sg610
    Language English
    Publisher Universitätsbibliothek der TU München
    Publishing place München
    Document type Book ; Online ; Thesis
    Database Digital theses on the web

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  7. Article ; Online: Deep Learning for Retrospective Motion Correction in MRI: A Comprehensive Review.

    Spieker, Veronika / Eichhorn, Hannah / Hammernik, Kerstin / Rueckert, Daniel / Preibisch, Christine / Karampinos, Dimitrios C / Schnabel, Julia A

    IEEE transactions on medical imaging

    2024  Volume 43, Issue 2, Page(s) 846–859

    Abstract: Motion represents one of the major challenges in magnetic resonance imaging (MRI). Since the MR signal is acquired in frequency space, any motion of the imaged object leads to complex artefacts in the reconstructed image in addition to other MR imaging ... ...

    Abstract Motion represents one of the major challenges in magnetic resonance imaging (MRI). Since the MR signal is acquired in frequency space, any motion of the imaged object leads to complex artefacts in the reconstructed image in addition to other MR imaging artefacts. Deep learning has been frequently proposed for motion correction at several stages of the reconstruction process. The wide range of MR acquisition sequences, anatomies and pathologies of interest, and motion patterns (rigid vs. deformable and random vs. regular) makes a comprehensive solution unlikely. To facilitate the transfer of ideas between different applications, this review provides a detailed overview of proposed methods for learning-based motion correction in MRI together with their common challenges and potentials. This review identifies differences and synergies in underlying data usage, architectures, training and evaluation strategies. We critically discuss general trends and outline future directions, with the aim to enhance interaction between different application areas and research fields.
    MeSH term(s) Image Processing, Computer-Assisted/methods ; Retrospective Studies ; Deep Learning ; Motion ; Magnetic Resonance Imaging/methods ; Artifacts
    Language English
    Publishing date 2024-02-02
    Publishing country United States
    Document type Review ; Journal Article
    ZDB-ID 622531-7
    ISSN 1558-254X ; 0278-0062
    ISSN (online) 1558-254X
    ISSN 0278-0062
    DOI 10.1109/TMI.2023.3323215
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    Zs.A 2546: Show issues Location:
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  8. Article ; Online: Motion-induced phase-corrected homodyne reconstruction for partial Fourier single-shot diffusion-weighted echo planar imaging of the liver.

    Van, Anh T / McTavish, Sean / Peeters, Johannes M / Weiss, Kilian / Makowski, Marcus R / Braren, Rickmer F / Karampinos, Dimitrios C

    NMR in biomedicine

    2024  , Page(s) e5147

    Abstract: Partial Fourier encoding is popular in single-shot (ss) diffusion-weighted (DW) echo planar imaging (EPI) because it enables a shorter echo time (TE) and, hence, improves the signal-to-noise-ratio. Motion during diffusion encoding causes k-space shifting ...

    Abstract Partial Fourier encoding is popular in single-shot (ss) diffusion-weighted (DW) echo planar imaging (EPI) because it enables a shorter echo time (TE) and, hence, improves the signal-to-noise-ratio. Motion during diffusion encoding causes k-space shifting and dispersion, which compromises the quality of the homodyne reconstruction. This work provides a comprehensive understanding of the artifacts in homodyne reconstruction of partial Fourier ss-DW-EPI data in the presence of motion-induced phase and proposes the motion-induced phase-corrected homodyne (mpc-hdyne) reconstruction method to ameliorate these artifacts. Simulations with different types of motion-induced phase were performed to provide an understanding of the potential artifacts that occur in the homodyne reconstruction of partial Fourier ss-DW-EPI data. To correct for the artifacts, the mpc-hdyne reconstruction is proposed. The algorithm recenters k-space, updates the partial Fourier factor according to detected global k-space shifts, and removes low-resolution nonlinear phase before the conventional homodyne reconstruction. The mpc-hdyne reconstruction is tested on both simulation and in vivo data. Motion-induced phase can cause signal overestimation, worm artifacts, and signal loss in partial Fourier ss-DW-EPI data with the conventional homodyne reconstruction. Simulation and in vivo data showed that the proposed mpc-hdyne reconstruction ameliorated artifacts, yielding higher quality DW images compared with conventional homodyne reconstruction. Based on the understanding of the artifacts in homodyne reconstruction of partial Fourier ss-DW-EPI data, the mpc-hdyne reconstruction was proposed and showed superior performance compared with the conventional homodyne reconstruction on both simulation and in vivo data.
    Language English
    Publishing date 2024-04-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 1000976-0
    ISSN 1099-1492 ; 0952-3480
    ISSN (online) 1099-1492
    ISSN 0952-3480
    DOI 10.1002/nbm.5147
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    Zs.A 2869: Show issues Location:
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  9. Article ; Online: Chemical-shift encoding-based water-fat separation with multifrequency fat spectrum modeling in spin-lock MRI.

    Chen, Weitian / Karampinos, Dimitrios C

    Magnetic resonance in medicine

    2019  Volume 83, Issue 5, Page(s) 1608–1624

    Abstract: Purpose: Chemical exchange saturation transfer is used commonly to generate MRI contrast based on the chemical exchange effect. The spin-lock techniques can also be used to probe the chemical exchange and other molecular motion processes in tissues. The ...

    Abstract Purpose: Chemical exchange saturation transfer is used commonly to generate MRI contrast based on the chemical exchange effect. The spin-lock techniques can also be used to probe the chemical exchange and other molecular motion processes in tissues. The presence of fat can cause errors in spin-lock MRI. Signals from fat are typically suppressed based on spectral selectivity or T
    Methods: Both the conventional spin-lock and the adiabatic continuous-wave constant-amplitude spin lock (ACCSL) with multi-echo acquisitions are investigated for chemical-shift encoding-based water-fat separation in spin-lock imaging. A comparison is made of reconstructions based on 3 models: a single-peak fat spectrum model, a standard precalibrated proton density 6-peak fat spectrum model, and the self-calibrated relaxation-dependent 3-peak fat spectrum model. Comparisons were performed using Bloch simulations, phantom, and in vivo experiments at 3 T.
    Results: Conventional spin-lock acquisitions cannot be used for reliable water-fat separation with a multipeak fat spectrum model. Water-fat separation based on ACCSL acquisitions achieves superior performance compared with the use of conventional spin-lock acquisitions. The best result is achieved from ACCSL acquisition with self-calibrated relaxation-dependent multipeak fat spectrum modeling.
    Conclusion: The ACCSL acquisition can be used for chemical-shift encoding-based water-fat separation with multipeak fat spectrum modeling. This approach has the potential to improve quantitative analysis using spin-lock MRI for assessing the biochemical properties of tissues.
    MeSH term(s) Magnetic Resonance Imaging ; Phantoms, Imaging ; Protons ; Water
    Chemical Substances Protons ; Water (059QF0KO0R)
    Language English
    Publishing date 2019-10-08
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 605774-3
    ISSN 1522-2594 ; 0740-3194
    ISSN (online) 1522-2594
    ISSN 0740-3194
    DOI 10.1002/mrm.28026
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Partial Fourier in the presence of respiratory motion in prostate diffusion-weighted echo planar imaging.

    McTavish, Sean / Van, Anh T / Peeters, Johannes M / Weiss, Kilian / Harder, Felix N / Makowski, Marcus R / Braren, Rickmer F / Karampinos, Dimitrios C

    Magma (New York, N.Y.)

    2024  

    Abstract: Purpose: To investigate the effect of respiratory motion in terms of signal loss in prostate diffusion-weighted imaging (DWI), and to evaluate the usage of partial Fourier in a free-breathing protocol in a clinically relevant b-value range using both ... ...

    Abstract Purpose: To investigate the effect of respiratory motion in terms of signal loss in prostate diffusion-weighted imaging (DWI), and to evaluate the usage of partial Fourier in a free-breathing protocol in a clinically relevant b-value range using both single-shot and multi-shot acquisitions.
    Methods: A controlled breathing DWI acquisition was first employed at 3 T to measure signal loss from deep breathing patterns. Single-shot and multi-shot (2-shot) acquisitions without partial Fourier (no pF) and with partial Fourier (pF) factors of 0.75 and 0.65 were employed in a free-breathing protocol. The apparent SNR and ADC values were evaluated in 10 healthy subjects to measure if low pF factors caused low apparent SNR or overestimated ADC.
    Results: Controlled breathing experiments showed a difference in signal coefficient of variation between shallow and deep breathing. In free-breathing single-shot acquisitions, the pF 0.65 scan showed a significantly (p < 0.05) higher apparent SNR than pF 0.75 and no pF in the peripheral zone (PZ) of the prostate. In the multi-shot acquisitions in the PZ, pF 0.75 had a significantly higher apparent SNR than 0.65 pF and no pF. The single-shot pF 0.65 scan had a significantly lower ADC than single-shot no pF.
    Conclusion: Deep breathing patterns can cause intravoxel dephasing in prostate DWI. For single-shot acquisitions at a b-value of 800 s/mm
    Language English
    Publishing date 2024-05-14
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1160826-2
    ISSN 1352-8661 ; 0968-5243
    ISSN (online) 1352-8661
    ISSN 0968-5243
    DOI 10.1007/s10334-024-01162-x
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    Zs.A 3788: Show issues Location:
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