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Article ; Online: Can Chronic Myocardial Infarction Be Detected by Native T1 Mapping?

Kellman, Peter

2022 Volume 15, Issue 12, Page(s) 2080–2081

MeSH term(s)	Humans ; Predictive Value of Tests
Language	English
Publishing date	2022-11-16
Publishing country	United States
Document type	Editorial
ZDB-ID	2491503-8
ISSN	1876-7591 ; 1936-878X
ISSN (online)	1876-7591
ISSN	1936-878X
DOI	10.1016/j.jcmg.2022.09.012
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Article ; Online: Dark-Blood Late-Enhancement Imaging Improves Detection of Myocardial Infarction.

Kellman, Peter

JACC. Cardiovascular imaging

2017 Volume 11, Issue 12, Page(s) 1770–1772

MeSH term(s)	Heart ; Humans ; Magnetic Resonance Spectroscopy ; Myocardial Infarction
Language	English
Publishing date	2017-12-13
Publishing country	United States
Document type	Editorial ; Comment
ZDB-ID	2491503-8
ISSN	1876-7591 ; 1936-878X
ISSN (online)	1876-7591
ISSN	1936-878X
DOI	10.1016/j.jcmg.2017.10.014
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Article: Free-breathing Late Enhancement Imaging: Phase Sensitive Inversion Recovery (PSIR) with Respiratory Motion Corrected (MOCO) Averaging2

Kellman, Peter

Magnetom flash

2017 Volume -, Issue 1 = Nr. 67, Page(s) 42

Language	English
Document type	Article
ZDB-ID	2465783-9
Database	Current Contents Medicine

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Article ; Online: Diagnostic confidence with quantitative cardiovascular magnetic resonance perfusion mapping increases with increased coverage of the left ventricle.

Engblom, Henrik / Ostenfeld, Ellen / Carlsson, Marcus / Åkesson, Julius / Aletras, Anthony H / Xue, Hui / Kellman, Peter / Arheden, Håkan

Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance

2024 Volume 26, Issue 1, Page(s) 101007

Abstract: Background: Quantitative cardiovascular magnetic resonance (CMR) first pass perfusion maps are conventionally acquired with 3 short-axis (SAX) views (basal, mid, and apical) in every heartbeat (3SAX/1RR). Thus, a significant part of the left ventricle ( ... ...

Abstract	Background: Quantitative cardiovascular magnetic resonance (CMR) first pass perfusion maps are conventionally acquired with 3 short-axis (SAX) views (basal, mid, and apical) in every heartbeat (3SAX/1RR). Thus, a significant part of the left ventricle (LV) myocardium, including the apex, is not covered. The aims of this study were 1) to investigate if perfusion maps acquired with 3 short-axis views sampled every other RR-interval (2RR) yield comparable quantitative measures of myocardial perfusion (MP) as 1RR and 2) to assess if acquiring 3 additional perfusion views (i.e., total of 6) every other RR-interval (2RR) increases diagnostic confidence. Methods: In 287 patients with suspected ischemic heart disease stress and rest MP were performed on clinical indication on a 1.5T MR scanner. Eighty-three patients were examined by acquiring 3 short-axis perfusion maps with 1RR sampling (3SAX/1RR); for which also 2RR maps were reconstructed. Additionally, in 103 patients 3 short-axis and 3 long-axis (LAX; 2-, 3, and 4-chamber view) perfusion maps were acquired using 2RR sampling (3SAX + 3LAX/2RR) and in 101 patients 6 short-axis perfusion maps using 2RR sampling (6SAX/2RR) were acquired. The diagnostic confidence for ruling in or out stress-induced ischemia was scored according to a Likert scale (certain ischemia [2 points], probably ischemia [1 point], uncertain [0 points], probably no ischemia [1 point], certain no ischemia [2 points]). Results: There was a strong correlation (R = 0.99) between 3SAX/1RR and 3SAX/2RR for global MP (mL/min/g). The diagnostic confidence score increased significantly when the number of perfusion views was increased from 3 to 6 (1.24 ± 0.68 vs 1.54 ± 0.64, p < 0.001 with similar increase for 3SAX+3LAX/2RR (1.29 ± 0.68 vs 1.55 ± 0.65, p < 0.001) and for 6SAX/2RR (1.19 ± 0.69 vs 1.53 ± 0.63, p < 0.001). Conclusion: Quantitative perfusion mapping with 2RR sampling of data yields comparable perfusion values as 1RR sampling, allowing for the acquisition of additional views within the same perfusion scan. The diagnostic confidence for stress-induced ischemia increases when adding 3 additional views, short- or long axes, to the conventional 3 short-axis views. Thus, future development and clinical implementation of quantitative CMR perfusion should aim at increasing the LV coverage from the current standard using 3 short-axis views.
Language	English
Publishing date	2024-02-03
Publishing country	England
Document type	Journal Article
ZDB-ID	1458034-2
ISSN	1532-429X ; 1097-6647
ISSN (online)	1532-429X
ISSN	1097-6647
DOI	10.1016/j.jocmr.2024.101007
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Article: Free-breathing Late Enhancement Imaging: Phase Sensitive Inversion Recovery (PSIR) with Respiratory Motion Corrected (MOCO) Averaging

Kellman, Peter

Magnetom flash

2016 Volume -, Issue 3 = Nr. 66, Page(s) 65

Language	English
Document type	Article
ZDB-ID	2465783-9
Database	Current Contents Medicine

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Article: High-fidelity Database-free Deep Learning Reconstruction for Real-time Cine Cardiac MRI.

Demirel, Ömer Burak / Zhang, Chi / Yaman, Burhaneddin / Gulle, Merve / Shenoy, Chetan / Leiner, Tim / Kellman, Peter / Akçakaya, Mehmet

bioRxiv : the preprint server for biology

2023

Abstract: Real-time cine cardiac MRI provides an ECG-free free-breathing alternative to clinical gold-standard ECG-gated breath-hold segmented cine MRI for evaluation of heart function. Real-time cine MRI data acquisition during free breathing snapshot imaging ... ...

Abstract	Real-time cine cardiac MRI provides an ECG-free free-breathing alternative to clinical gold-standard ECG-gated breath-hold segmented cine MRI for evaluation of heart function. Real-time cine MRI data acquisition during free breathing snapshot imaging enables imaging of patient cohorts that cannot be imaged with segmented or breath-hold acquisitions, but requires rapid imaging to achieve sufficient spatial-temporal resolutions. However, at high acceleration rates, conventional reconstruction techniques suffer from residual aliasing and temporal blurring, including advanced methods such as compressed sensing with radial trajectories. Recently, deep learning (DL) reconstruction has emerged as a powerful tool in MRI. However, its utility for free-breathing real-time cine MRI has been limited, as database-learning of spatio-temporal correlations with varying breathing and cardiac motion patterns across subjects has been challenging. Zero-shot self-supervised physics-guided deep learning (PG-DL) reconstruction has been proposed to overcome such challenges of database training by enabling subject-specific training. In this work, we adapt zero-shot PG-DL for real-time cine MRI with a spatio-temporal regularization. We compare our method to TGRAPPA, locally low-rank (LLR) regularized reconstruction and database-trained PG-DL reconstruction, both for retrospectively and prospectively accelerated datasets. Results on highly accelerated real-time Cartesian cine MRI show that the proposed method outperforms other reconstruction methods, both visibly in terms of noise and aliasing, and quantitatively.
Language	English
Publishing date	2023-02-15
Publishing country	United States
Document type	Preprint
DOI	10.1101/2023.02.13.528388
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Article ; Online: Increased cardiac involvement in Fabry disease using blood-corrected native T1 mapping.

Nickander, Jannike / Cole, Ben / Nordin, Sabrina / Vijapurapu, Ravi / Steeds, Richard P / Moon, James C / Kellman, Peter / Ugander, Martin / Kozor, Rebecca

Scientific reports

2023 Volume 13, Issue 1, Page(s) 4420

Abstract: Fabry disease (FD) is a rare lysosomal storage disorder resulting in myocardial sphingolipid accumulation which is detectable by cardiovascular magnetic resonance as low native T1. However, myocardial T1 contains signal from intramyocardial blood which ... ...

Abstract	Fabry disease (FD) is a rare lysosomal storage disorder resulting in myocardial sphingolipid accumulation which is detectable by cardiovascular magnetic resonance as low native T1. However, myocardial T1 contains signal from intramyocardial blood which affects variability and consequently measurement precision and accuracy. Correction of myocardial T1 by blood T1 increases precision. We therefore deployed a multicenter study of FD patients (n = 218) and healthy controls (n = 117) to investigate if blood-correction of myocardial native T1 increases the number of FD patients with low T1, and thus reclassifies FD patients as having cardiac involvement. Cardiac involvement was defined as a native T1 value 2 standard deviations below site-specific means in healthy controls for both corrected and uncorrected measures. Overall low T1 was 135/218 (62%) uncorrected vs. 145/218 (67%) corrected (p = 0.02). With blood-correction, 13/83 previously normal patients were reclassified to low T1. This reclassification appears clinically relevant as 6/13 (46%) of reclassified had focal late gadolinium enhancement or left ventricular hypertrophy as signs of cardiac involvement. Blood-correction of myocardial native T1 increases the proportion of FD subjects with low myocardial T1, with blood-corrected results tracking other markers of cardiac involvement. Blood-correction may potentially offer earlier detection and therapy initiation, but merits further prospective studies.
MeSH term(s)	Humans ; Fabry Disease/diagnosis ; Contrast Media ; Prospective Studies ; Ventricular Function, Left ; Gadolinium ; Myocardium/pathology ; Predictive Value of Tests ; Magnetic Resonance Imaging, Cine/methods
Chemical Substances	Contrast Media ; Gadolinium (AU0V1LM3JT)
Language	English
Publishing date	2023-03-17
Publishing country	England
Document type	Multicenter Study ; Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-023-31211-9
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Article ; Online: The impact of water exchange on estimates of myocardial extracellular volume calculated using contrast enhanced T

Sharrack, Noor / Biglands, John D / Broadbent, David A / Kellman, Peter / Chow, Kelvin / Greenwood, John P / Levelt, Eylem / Plein, Sven / Buckley, David L

Magnetic resonance in medicine

2023 Volume 91, Issue 4, Page(s) 1637–1644

Abstract: Purpose: Guidelines recommend measuring myocardial extracellular volume (ECV) using T: Methods: Twenty-five patients with severe AS and 5 healthy controls were recruited. T: Results: Median (range) ECV estimated using the 2SXM model was 25% (21%- ... ...

Abstract	Purpose: Guidelines recommend measuring myocardial extracellular volume (ECV) using T Methods: Twenty-five patients with severe AS and 5 healthy controls were recruited. T Results: Median (range) ECV estimated using the 2SXM model was 25% (21%-39%) for patients and 26% (22%-29%) for controls. ECV estimated in patients using the LM at 10 min following a cumulative contrast dose of 0.15 mmol/kg was 21% (17%-32%) and increased significantly to 22% (19%-35%) at 30 min (p = 0.0001). ECV estimated using the LM was highest following low dose gadobutrol, 25% (19%-38%). Conclusion: Current guidelines on contrast agent dose for ECV measurements may lead to underestimated ECV in patients with severe AS because of limited WX. Use of a lower contrast agent dose may mitigate this effect.
MeSH term(s)	Humans ; Contrast Media ; Organometallic Compounds ; Myocardium ; Predictive Value of Tests ; Aortic Valve Stenosis/diagnostic imaging ; Magnetic Resonance Imaging, Cine
Chemical Substances	gadobutrol (1BJ477IO2L) ; Contrast Media ; Organometallic Compounds
Language	English
Publishing date	2023-12-01
Publishing country	United States
Document type	Journal Article
ZDB-ID	605774-3
ISSN	1522-2594 ; 0740-3194
ISSN (online)	1522-2594
ISSN	0740-3194
DOI	10.1002/mrm.29956
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Article ; Online: High-fidelity Database-free Deep Learning Reconstruction for Real-time Cine Cardiac MRI.

Demirel, Omer Burak / Zhang, Chi / Yaman, Burhaneddin / Gulle, Merve / Shenoy, Chetan / Leiner, Tim / Kellman, Peter / Akcakaya, Mehmet

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

2023 Volume 2023, Page(s) 1–4

Abstract	Real-time cine cardiac MRI provides an ECG-free free-breathing alternative to clinical gold-standard ECG-gated breath-hold segmented cine MRI for evaluation of heart function. Real-time cine MRI data acquisition during free breathing snapshot imaging enables imaging of patient cohorts that cannot be imaged with segmented or breath-hold acquisitions, but requires rapid imaging to achieve sufficient spatial-temporal resolutions. However, at high acceleration rates, conventional reconstruction techniques suffer from residual aliasing and temporal blurring, including advanced methods such as compressed sensing with radial trajectories. Recently, deep learning (DL) reconstruction has emerged as a powerful tool in MRI. However, its utility for free-breathing real-time cine MRI has been limited, as database-learning of spatio-temporal correlations with varying breathing and cardiac motion patterns across subjects has been challenging. Zero-shot self-supervised physics-guided deep learning (PG-DL) reconstruction has been proposed to overcome such challenges of database training by enabling subject-specific training. In this work, we adapt zero-shot PG-DL for real-time cine MRI with a spatio-temporal regularization. We compare our method to TGRAPPA, locally low-rank (LLR) regularized reconstruction and database-trained PG-DL reconstruction, both for retrospectively and prospectively accelerated datasets. Results on highly accelerated real-time Cartesian cine MRI show that the proposed method outperforms other reconstruction methods, both visibly in terms of noise and aliasing, and quantitatively.
MeSH term(s)	Humans ; Magnetic Resonance Imaging, Cine/methods ; Retrospective Studies ; Deep Learning ; Image Interpretation, Computer-Assisted/methods ; Heart/diagnostic imaging
Language	English
Publishing date	2023-12-11
Publishing country	United States
Document type	Journal Article
ISSN	2694-0604
ISSN (online)	2694-0604
DOI	10.1109/EMBC40787.2023.10340709
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Article: Timing of Regadenoson-induced Peak Hyperemia and the Effects on Coronary Flow Reserve.

Kattapuram, Nathan / Shadman, Shahrad / Morgan, Eric E / Benton, Charles / Awojoodu, Stacian / Kim, Dong-Yun / Ramos, Joao / Barac, Ana / Bandettini, W Patricia / Kellman, Peter / Weissman, Gaby / Carlsson, Marcus

medRxiv : the preprint server for health sciences

2024

Abstract: Background: Regadenoson is used to induce hyperemia in cardiac imaging, facilitating diagnosis of ischemia and assessment of coronary flow reserve (CFR). While the regadenoson package insert recommends administration of radionuclide tracer 10-20 seconds ...

Abstract	Background: Regadenoson is used to induce hyperemia in cardiac imaging, facilitating diagnosis of ischemia and assessment of coronary flow reserve (CFR). While the regadenoson package insert recommends administration of radionuclide tracer 10-20 seconds after injection, peak hyperemia has been observed at approximately 100 seconds after injection in healthy volunteers undergoing cardiovascular magnetic resonance imaging (CMR). It is unclear when peak hyperemia occurs in a patient population. Objectives: The goal of this study was to determine time to peak hyperemia after regadenoson injection in healthy volunteers and patients, and whether the recommended image timing in the package insert underestimates CFR. Methods: Healthy volunteers (n=15) and patients (n=25) underwent stress CMR, including phase-contrast imaging of the coronary sinus at rest and multiple timepoints after 0.4 mg regadenoson injection. Coronary sinus flow (ml/min) was divided by resting values to yield CFR. Smoothed, time-resolved curves for CFR were generated with pointwise 95% confidence intervals. Results: CFR between 60 and 120 seconds was significantly higher than CFR at 30 seconds after regadenoson injection (p < 0.05) as shown by non-overlapping 95% confidence intervals for both healthy volunteers (30 s, [2.8, 3.4]; 60 s, [3.8, 4.4]; 90 s, [4.1, 4.7]; 120 s, [3.6, 4.3]) and patients (30 s, [2.1, 2.5]; 60 s, [2.6, 3.1]; 90 s, [2.7, 3.2]; 120 s, [2.5, 3.1]). Conclusion: Imaging at 90 seconds following regadenoson injection is the optimal approach to capture peak hyperemia. Imaging at 30 seconds, which is more aligned with the package insert recommendation, would yield an underestimate of CFR and confound assessment of microvascular dysfunction.
Language	English
Publishing date	2024-01-16
Publishing country	United States
Document type	Preprint
DOI	10.1101/2024.01.15.23300449
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