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Neofytou AP, Neji R, Kowalik GT, Mooiweer R, Wong J, Fotaki A, Ferreira J, Evans C, Bosio F, Mughal N, Razavi R, Pushparajah K, Roujol S. Retrospective motion correction through multi-average k-space data elimination (REMAKE) for free-breathing cardiac cine imaging. Magn Reson Med 2023; 89:2242-2254. [PMID: 36763898 PMCID: PMC10952356 DOI: 10.1002/mrm.29613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 01/06/2023] [Accepted: 01/20/2023] [Indexed: 02/12/2023]
Abstract
PURPOSE To develop a motion-robust reconstruction technique for free-breathing cine imaging with multiple averages. METHOD Retrospective motion correction through multiple average k-space data elimination (REMAKE) was developed using iterative removal of k-space segments (from individual k-space samples) that contribute most to motion corruption while combining any remaining segments across multiple signal averages. A variant of REMAKE, termed REMAKE+, was developed to address any losses in SNR due to k-space information removal. With REMAKE+, multiple reconstructions using different initial conditions were performed, co-registered, and averaged. Both techniques were validated against clinical "standard" signal averaging reconstruction in a static phantom (with simulated motion) and 15 patients undergoing free-breathing cine imaging with multiple averages. Quantitative analysis of myocardial sharpness, blood/myocardial SNR, myocardial-blood contrast-to-noise ratio (CNR), as well as subjective assessment of image quality and rate of diagnostic quality images were performed. RESULTS In phantom, motion artifacts using "standard" (RMS error [RMSE]: 2.2 ± 0.5) were substantially reduced using REMAKE/REMAKE+ (RMSE: 1.5 ± 0.4/1.0 ± 0.4, p < 0.01). In patients, REMAKE/REMAKE+ led to higher myocardial sharpness (0.79 ± 0.09/0.79 ± 0.1 vs. 0.74 ± 0.12 for "standard", p = 0.004/0.04), higher image quality (1.8 ± 0.2/1.9 ± 0.2 vs. 1.6 ± 0.4 for "standard", p = 0.02/0.008), and a higher rate of diagnostic quality images (99%/100% vs. 94% for "standard"). Blood/myocardial SNR for "standard" (94 ± 30/33 ± 10) was higher vs. REMAKE (80 ± 25/28 ± 8, p = 0.002/0.005) and tended to be lower vs. REMAKE+ (105 ± 33/36 ± 12, p = 0.02/0.06). Myocardial-blood CNR for "standard" (61 ± 22) was higher vs. REMAKE (53 ± 19, p = 0.003) and lower vs. REMAKE+ (69 ± 24, p = 0.007). CONCLUSIONS Compared to "standard" signal averaging reconstruction, REMAKE and REMAKE+ provide improved myocardial sharpness, image quality, and rate of diagnostic quality images.
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Affiliation(s)
- Alexander Paul Neofytou
- School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and MedicineKing's College LondonLondonUK
| | - Radhouene Neji
- School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and MedicineKing's College LondonLondonUK
- MR Research CollaborationsSiemens Healthcare LimitedNewton House, Sir William Siemens Square, Frimley, CamberleySurreyUK
| | - Grzegorz Tomasz Kowalik
- School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and MedicineKing's College LondonLondonUK
| | - Ronald Mooiweer
- School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and MedicineKing's College LondonLondonUK
- MR Research CollaborationsSiemens Healthcare LimitedNewton House, Sir William Siemens Square, Frimley, CamberleySurreyUK
| | - James Wong
- Department of Paediatric CardiologyEvelina London Children's HospitalLondonUK
| | - Anastasia Fotaki
- School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and MedicineKing's College LondonLondonUK
| | - Joana Ferreira
- School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and MedicineKing's College LondonLondonUK
| | - Carl Evans
- School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and MedicineKing's College LondonLondonUK
| | - Filippo Bosio
- School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and MedicineKing's College LondonLondonUK
| | - Nabila Mughal
- School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and MedicineKing's College LondonLondonUK
| | - Reza Razavi
- School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and MedicineKing's College LondonLondonUK
| | - Kuberan Pushparajah
- School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and MedicineKing's College LondonLondonUK
- Department of Paediatric CardiologyEvelina London Children's HospitalLondonUK
| | - Sébastien Roujol
- School of Biomedical Engineering and Imaging Sciences, Faculty of Life Sciences and MedicineKing's College LondonLondonUK
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2
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Zhou R, Yang Y, Mathew RC, Mugler JP, Weller DS, Kramer CM, Ahmed AH, Jacob M, Salerno M. Free-breathing cine imaging with motion-corrected reconstruction at 3T using SPiral Acquisition with Respiratory correction and Cardiac Self-gating (SPARCS). Magn Reson Med 2019; 82:706-720. [PMID: 31006916 DOI: 10.1002/mrm.27763] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 03/12/2019] [Accepted: 03/15/2019] [Indexed: 12/28/2022]
Abstract
PURPOSE To develop a continuous-acquisition cardiac self-gated spiral pulse sequence and a respiratory motion-compensated reconstruction strategy for free-breathing cine imaging. METHODS Cine data were acquired continuously on a 3T scanner for 8 seconds per slice without ECG gating or breath-holding, using a golden-angle gradient echo spiral pulse sequence. Cardiac motion information was extracted by applying principal component analysis on the gridded 8 × 8 k-space center data. Respiratory motion was corrected by rigid registration on each heartbeat. Images were reconstructed using a low-rank and sparse (L+S) technique. This strategy was evaluated in 37 healthy subjects and 8 subjects undergoing clinical cardiac MR studies. Image quality was scored (1-5 scale) in a blinded fashion by 2 experienced cardiologists. In 13 subjects with whole-heart coverage, left ventricular ejection fraction (LVEF) from SPiral Acquisition with Respiratory correction and Cardiac Self-gating (SPARCS) was compared to that from a standard ECG-gated breath-hold balanced steady-state free precession (bSSFP) cine sequence. RESULTS The self-gated signal was successfully extracted in all cases and demonstrated close agreement with the acquired ECG signal (mean bias, -0.22 ms). The mean image score across all subjects was 4.0 for reconstruction using the L+S model. There was good agreement between the LVEF derived from SPARCS and the gold-standard bSSFP technique. CONCLUSION SPARCS successfully images cardiac function without the need for ECG gating or breath-holding. With an 8-second data acquisition per slice, whole-heart cine images with clinically acceptable spatial and temporal resolution and image quality can be acquired in <90 seconds of free-breathing acquisition.
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Affiliation(s)
- Ruixi Zhou
- Department of Biomedical Engineering, University of Virginia Health System, Charlottesville, Virginia
| | - Yang Yang
- Department of Medicine, Cardiovascular Division, University of Virginia Health System, Charlottesville, Virginia.,Translational and Molecular Imaging Institute and Department of Radiology, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Roshin C Mathew
- Department of Medicine, Cardiovascular Division, University of Virginia Health System, Charlottesville, Virginia.,Radiology and Medical Imaging, University of Virginia Health System, Charlottesville, Virginia
| | - John P Mugler
- Department of Biomedical Engineering, University of Virginia Health System, Charlottesville, Virginia.,Department of Medicine, Cardiovascular Division, University of Virginia Health System, Charlottesville, Virginia.,Radiology and Medical Imaging, University of Virginia Health System, Charlottesville, Virginia
| | - Daniel S Weller
- Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, Virginia
| | - Christopher M Kramer
- Department of Medicine, Cardiovascular Division, University of Virginia Health System, Charlottesville, Virginia.,Radiology and Medical Imaging, University of Virginia Health System, Charlottesville, Virginia
| | - Abdul Haseeb Ahmed
- Department of Electrical and Computer Engineering, University of Iowa, Iowa City, Iowa
| | - Mathews Jacob
- Department of Electrical and Computer Engineering, University of Iowa, Iowa City, Iowa
| | - Michael Salerno
- Department of Biomedical Engineering, University of Virginia Health System, Charlottesville, Virginia.,Department of Medicine, Cardiovascular Division, University of Virginia Health System, Charlottesville, Virginia.,Radiology and Medical Imaging, University of Virginia Health System, Charlottesville, Virginia
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3
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Göransson C, Vejlstrup N, Carlsen J. Exercise cardiovascular magnetic resonance imaging allows differentiation of low-risk pulmonary arterial hypertension. J Heart Lung Transplant 2019; 38:627-635. [PMID: 30733157 DOI: 10.1016/j.healun.2019.01.1305] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 12/31/2018] [Accepted: 01/22/2019] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND Patients with pulmonary arterial hypertension (PAH) have a decreased ability to compensate for demands on increased cardiac output, such as during exercise. In this study we aimed to differentiate cardiac exercise responses in patients with PAH, stratified according to known measurements of disease severity. METHODS Right and left ventricular end-diastolic volume and end-systolic volume, stroke volume (SV), and cardiac output were measured in 20 patients with PAH and a lower risk of mortality with 6-month intervals using cardiovascular magnetic resonance (CMR) imaging during rest and during ergometer exercise (totaling 44 scans). Exercise measurements were compared with resting cardiac conditions and clinical assessment using mixed model statistics. RESULTS SV response during exercise was associated with disease severity. World Health Organization functional class (WHO FC) I and right ventricular end-diastolic volume (RVEDV) <221 ml were associated with increased SV during exercise (WHO FC I: 7% increase in SV; p < 0.001). In contrast, WHO FC II was associated with an 8% decrease in SV (p = 0.02), and SV response declined progressively with right ventricular dilation (7-ml decrease in SV per 100-ml increase in RVEDV; p < 0.001). CONCLUSIONS Assessment of right ventricular function with CMR during exercise stratifies patients currently perceived as having a low risk of mortality into different degrees of right ventricular inotropic reserve. Reduced SV during exercise is a plausible factor to increased risk of decompensation, possibly warranting targeted therapy intensification to restore right ventricular functional reserve.
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Affiliation(s)
- Christoffer Göransson
- Department of Cardiology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Niels Vejlstrup
- Department of Cardiology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Jørn Carlsen
- Department of Cardiology, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark.
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Elinoff JM, Agarwal R, Barnett CF, Benza RL, Cuttica MJ, Gharib AM, Gray MP, Hassoun PM, Hemnes AR, Humbert M, Kolb TM, Lahm T, Leopold JA, Mathai SC, McLaughlin VV, Preston IR, Rosenzweig EB, Shlobin OA, Steen VD, Zamanian RT, Solomon MA. Challenges in Pulmonary Hypertension: Controversies in Treating the Tip of the Iceberg. A Joint National Institutes of Health Clinical Center and Pulmonary Hypertension Association Symposium Report. Am J Respir Crit Care Med 2018; 198:166-174. [PMID: 29425462 PMCID: PMC6058980 DOI: 10.1164/rccm.201710-2093pp] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Accepted: 02/09/2018] [Indexed: 01/13/2023] Open
Affiliation(s)
| | - Richa Agarwal
- Division of Cardiovascular Disease, Department of Medicine, Allegheny General Hospital, Pittsburgh, Pennsylvania
| | | | - Raymond L. Benza
- Division of Cardiovascular Disease, Department of Medicine, Allegheny General Hospital, Pittsburgh, Pennsylvania
| | - Michael J. Cuttica
- Division of Pulmonary and Critical Care Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Ahmed M. Gharib
- National Institute of Diabetes, Digestive, and Kidney Diseases, and
| | | | - Paul M. Hassoun
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Johns Hopkins University, Baltimore, Maryland
| | - Anna R. Hemnes
- Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee
| | - Marc Humbert
- Service de Pneumologie, Hôpital Bicêtre (Assistance Publique–Hôpitaux de Paris), Institut National de la Santé et de la Recherche Médicale U999, University Paris–Sud, Université Paris-Saclay, Le Kremlin-Bicêtre, France
| | - Todd M. Kolb
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Johns Hopkins University, Baltimore, Maryland
| | - Tim Lahm
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Indiana University, Indianapolis, Indiana
- Richard L. Roudebush VA Medical Center, Indianapolis, Indiana
| | - Jane A. Leopold
- Division of Cardiovascular Medicine, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
| | - Stephen C. Mathai
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Johns Hopkins University, Baltimore, Maryland
| | - Vallerie V. McLaughlin
- Division of Cardiology, Department of Medicine, University of Michigan, Ann Arbor, Michigan
| | - Ioana R. Preston
- Department of Medicine, Tufts Medical Center, Tufts University School of Medicine, Boston, Massachusetts
| | | | - Oksana A. Shlobin
- Pulmonary Vascular Disease Program, Inova Fairfax Hospital, Falls Church, Virginia
| | - Virginia D. Steen
- Rheumatology Division, Department of Medicine, Georgetown University, Washington, DC; and
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Wang H, Qiu L, Wang G, Gao F, Jia H, Zhao J, Chen W, Wang C, Zhao B. The impact of dual-source parallel radiofrequency transmission with patient-adaptive shimming on the cardiac magnetic resonance in children at 3.0 T. Medicine (Baltimore) 2017; 96:e7034. [PMID: 28591036 PMCID: PMC5466214 DOI: 10.1097/md.0000000000007034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The cardiac magnetic resonance (CMR) of children at 3.0 T presents a unique set of technical challenges because of their small cardiac anatomical structures, fast heart rates, and the limited ability to keep motionless and hold breathe, which could cause problems associated with field inhomogeneity and degrade the image quality. The aim of our study was to evaluate the effect of dual-source parallel radiofrequency (RF) transmission on the B1 homogeneity and image quality in children with CMR at 3.0 T. The study was approved by the institutional ethics committee and written informed consent was obtained. A total of 30 free-breathing children and 30 breath-hold children performed CMR examinations with dual-source and single-source RF transmission. The B1 homogeneity, contrast ratio (CR) of cine images, and off-resonance artifacts in cine images between dual-source and single-source RF transmission were assessed in free-breathing and breath-hold groups, respectively. In both free-breathing and breath-hold groups, higher mean percentage of flip angle (free-breathing group: 104.2 ± 4.6 vs 95.5 ± 6.3, P < .001; breath-hold group: 101.5 ± 5.1 vs 92.5 ± 6.3, P < .001) and lower coefficient of variation (free-breathing group: 0.06 ± 0.02 vs 0.09 ± 0.03, P < .001; breath-hold group: 0.07 ± 0.03 vs 0.10 ± 0.04, P = .005) were found with dual-source than with single-source RF transmission. Both the CRs in the horizontal long axis (HLA) and short axis of cine images with dual-source RF transmission was improved (P < .05 for all). The scores of off-resonance artifacts in the HLA with dual-source RF transmission were higher in both free-breathing and breath-hold groups (P < .05 for all), with substantial interreader agreement (kappa values from 0.68 to 0.74). Compared with conventional single-source, dual-source parallel RF transmission could significantly improve the B1 homogeneity and image quality for CMR in children at 3.0 T. This technology could be taken into account in CMR for children with cardiac diseases.
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Affiliation(s)
- Haipeng Wang
- Department of Radiology, Shandong Provincial Hospital affiliated to Shandong University
| | - Liyun Qiu
- Departments of Pharmacy, Jinan Central Hospital, Shandong University
| | - Guangbin Wang
- Shandong Medical Imaging Research Institute affiliated to Shandong University
| | - Fei Gao
- Shandong Medical Imaging Research Institute affiliated to Shandong University
| | - Haipeng Jia
- Department of Radiology, Qilu Hospital of Shandong University
| | - Junyu Zhao
- Department of Internal Medicine, Shandong Provincial Qianfoshan Hospital
| | - Weibo Chen
- MR Research Collaboration, Philips Healthcare, Shanghai, China
| | - Cuiyan Wang
- Shandong Medical Imaging Research Institute affiliated to Shandong University
| | - Bin Zhao
- Shandong Medical Imaging Research Institute affiliated to Shandong University
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6
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Wang H, Zhao B, Jia H, Gao F, Zhao J, Wang C. A retrospective study: cardiac MRI of fulminant myocarditis in children-can we evaluate the short-term outcomes? PeerJ 2016; 4:e2750. [PMID: 27994968 PMCID: PMC5162402 DOI: 10.7717/peerj.2750] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Accepted: 11/03/2016] [Indexed: 01/11/2023] Open
Abstract
Background Fulminant myocarditis (FM) is an inflammatory disease of the myocardium that results in ventricular systolic dysfunction and causes acute-onset heart failure. Cardiac magnetic resonance (CMR) has become the primary noninvasive tool for the diagnosis and evaluation of myocarditis. The aim of our study was to assess the CMR findings at different course of FM and the short-term outcomes of fulminant myocarditis (FM) in children. Methods Eight FM children with CMR examinations were included in our study. Initial baseline CMR was performed 10 days (range, 7–20 days) after onset of FM and follow-up CMR after 55 days (range, 33–75 days). Cardiac morphology and function and myocardial tissue characterization at baseline and follow-up CMR were compared using paired T-test and Mann–Whitney U test. The clinical data and initial CMR findings were also compared to predict short-term outcomes. Results The median age of eight FM children was 8.5 years old (range, 3–14). The initial CMR findings were most common with early gadolinium enhancement (EGE, 100%), followed by signal increasing on T2WI and late gadolinium enhancement (LGE, 87.5%), increased septal thickness (75.0%) and increased left ventricle ejection fraction (LVEF, 50.0%). Only three LGE (37.5%), one signal increasing on T2WI (12.5%) and one increased LVEF (12.5%) were found at follow-up. Statistically significant differences were found between initial and follow-up CMR abnormalities in the septal thickness, left ventricular end-diastolic diameter (LVEDD), end-systolic volume (ESV), LVEF, left ventricular mass, T2 ratio and LGE area (P = 0.011, P = 0.042, P = 0.016, P = 0.001, P = 0.003, P = 0.011, P = 0.020). The children with full recovery performed higher incidence of III° atrioventricular block (AVB, five cases VS 0 case) and smaller LGE area (104.0 ± 14.5 mm2 VS 138.0 ± 25.2 mm2) at baseline CMR. Discussion The CMR findings of FM in children were characteristic and useful for early diagnosis. Full recovery of clinical manifestations, immunological features and CMR findings could be found in most FM children. The presence of III° AVB and smaller LGE area at baseline CMR might indicate better short-term outcomes.
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Affiliation(s)
- Haipeng Wang
- Shandong Medical Imaging Research Institute Affiliated to Shandong University , Ji'nan , China
| | - Bin Zhao
- Shandong Medical Imaging Research Institute Affiliated to Shandong University , Ji'nan , China
| | - Haipeng Jia
- Department of Radiology, Qilu Hospital of Shandong University , Ji'nan , China
| | - Fei Gao
- Shandong Medical Imaging Research Institute Affiliated to Shandong University , Ji'nan , China
| | - Junyu Zhao
- Department of Internal Medicine, Shandong Provincial Qianfoshan Hospital , Ji'nan , China
| | - Cuiyan Wang
- Shandong Medical Imaging Research Institute Affiliated to Shandong University , Ji'nan , China
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Hamlet SM, Haggerty CM, Suever JD, Wehner GJ, Grabau JD, Andres KN, Vandsburger MH, Powell DK, Sorrell VL, Fornwalt BK. An interactive videogame designed to improve respiratory navigator efficiency in children undergoing cardiovascular magnetic resonance. J Cardiovasc Magn Reson 2016; 18:54. [PMID: 27599620 PMCID: PMC5012042 DOI: 10.1186/s12968-016-0272-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Accepted: 08/10/2016] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Advanced cardiovascular magnetic resonance (CMR) acquisitions often require long scan durations that necessitate respiratory navigator gating. The tradeoff of navigator gating is reduced scan efficiency, particularly when the patient's breathing patterns are inconsistent, as is commonly seen in children. We hypothesized that engaging pediatric participants with a navigator-controlled videogame to help control breathing patterns would improve navigator efficiency and maintain image quality. METHODS We developed custom software that processed the Siemens respiratory navigator image in real-time during CMR and represented diaphragm position using a cartoon avatar, which was projected to the participant in the scanner as visual feedback. The game incentivized children to breathe such that the avatar was positioned within the navigator acceptance window (±3 mm) throughout image acquisition. Using a 3T Siemens Tim Trio, 50 children (Age: 14 ± 3 years, 48 % female) with no significant past medical history underwent a respiratory navigator-gated 2D spiral cine displacement encoding with stimulated echoes (DENSE) CMR acquisition first with no feedback (NF) and then with the feedback game (FG). Thirty of the 50 children were randomized to undergo extensive off-scanner training with the FG using a MRI simulator, or no off-scanner training. Navigator efficiency, signal-to-noise ratio (SNR), and global left-ventricular strains were determined for each participant and compared. RESULTS Using the FG improved average navigator efficiency from 33 ± 15 to 58 ± 13 % (p < 0.001) and improved SNR by 5 % (p = 0.01) compared to acquisitions with NF. There was no difference in navigator efficiency (p = 0.90) or SNR (p = 0.77) between untrained and trained participants for FG acquisitions. Circumferential and radial strains derived from FG acquisitions were slightly reduced compared to NF acquisitions (-16 ± 2 % vs -17 ± 2 %, p < 0.001; 40 ± 10 % vs 44 ± 11 %, p = 0.005, respectively). There were no differences in longitudinal strain (p = 0.38). CONCLUSIONS Use of a respiratory navigator feedback game during navigator-gated CMR improved navigator efficiency in children from 33 to 58 %. This improved efficiency was associated with a 5 % increase in SNR for spiral cine DENSE. Extensive off-scanner training was not required to achieve the improvement in navigator efficiency.
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Affiliation(s)
- Sean M. Hamlet
- Department of Electrical Engineering, University of Kentucky, Lexington, KY USA
- Department of Pediatrics, University of Kentucky, Lexington, KY USA
| | - Christopher M. Haggerty
- Department of Pediatrics, University of Kentucky, Lexington, KY USA
- Institute for Advanced Application, Geisinger Health System, Danville, PA USA
| | - Jonathan D. Suever
- Department of Pediatrics, University of Kentucky, Lexington, KY USA
- Institute for Advanced Application, Geisinger Health System, Danville, PA USA
| | - Gregory J. Wehner
- Department of Pediatrics, University of Kentucky, Lexington, KY USA
- Department of Biomedical Engineering, University of Kentucky, Lexington, KY USA
| | | | | | - Moriel H. Vandsburger
- Department of Biomedical Engineering, University of Kentucky, Lexington, KY USA
- Department of Physiology, University of Kentucky, Lexington, KY USA
| | - David K. Powell
- Department of Biomedical Engineering, University of Kentucky, Lexington, KY USA
| | | | - Brandon K. Fornwalt
- Department of Pediatrics, University of Kentucky, Lexington, KY USA
- Institute for Advanced Application, Geisinger Health System, Danville, PA USA
- Department of Biomedical Engineering, University of Kentucky, Lexington, KY USA
- Department of Physiology, University of Kentucky, Lexington, KY USA
- Department of Medicine, University of Kentucky, Lexington, KY USA
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8
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Hamlet SM, Haggerty CM, Suever JD, Wehner GJ, Andres KN, Powell DK, Zhong X, Fornwalt BK. Optimal configuration of respiratory navigator gating for the quantification of left ventricular strain using spiral cine displacement encoding with stimulated echoes (DENSE) MRI. J Magn Reson Imaging 2016; 45:786-794. [PMID: 27458823 DOI: 10.1002/jmri.25389] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 06/29/2016] [Indexed: 11/11/2022] Open
Abstract
PURPOSE To determine the optimal respiratory navigator gating configuration for the quantification of left ventricular strain using spiral cine displacement encoding with stimulated echoes (DENSE) MRI. MATERIALS AND METHODS Two-dimensional spiral cine DENSE was performed on a 3 Tesla MRI using two single-navigator configurations (retrospective, prospective) and a combined "dual-navigator" configuration in 10 healthy adults and 20 healthy children. The adults also underwent breathhold DENSE as a reference standard for comparisons. Peak left ventricular strains, signal-to-noise ratio (SNR), and navigator efficiency were compared. Subjects also underwent dual-navigator gating with and without visual feedback to determine the effect on navigator efficiency. RESULTS There were no differences in circumferential, radial, and longitudinal strains between navigator-gated and breathhold DENSE (P = 0.09-0.95) (as confidence intervals, retrospective: [-1.0%-1.1%], [-7.4%-2.0%], [-1.0%-1.2%]; prospective: [-0.6%-2.7%], [-2.8%-8.3%], [-0.3%-2.9%]; dual: [-1.6%-0.5%], [-8.3%-3.2%], [-0.8%-1.9%], respectively). The dual configuration maintained SNR compared with breathhold acquisitions (16 versus 18, P = 0.06). SNR for the prospective configuration was lower than for the dual navigator in adults (P = 0.004) and children (P < 0.001). Navigator efficiency was higher (P < 0.001) for both retrospective (54%) and prospective (56%) configurations compared with the dual configuration (35%). Visual feedback improved the dual configuration navigator efficiency to 55% (P < 0.001). CONCLUSION When quantifying left ventricular strains using spiral cine DENSE MRI, a dual navigator configuration results in the highest SNR in adults and children. In adults, a retrospective configuration has good navigator efficiency without a substantial drop in SNR. Prospective gating should be avoided because it has the lowest SNR. Visual feedback represents an effective option to maintain navigator efficiency while using a dual navigator configuration. LEVEL OF EVIDENCE 2 J. Magn. Reson. Imaging 2017;45:786-794.
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Affiliation(s)
- Sean M Hamlet
- Department of Electrical and Computer Engineering, University of Kentucky, Lexington, Kentucky, USA.,Department of Pediatrics, University of Kentucky, Lexington, KY, USA
| | - Christopher M Haggerty
- Department of Pediatrics, University of Kentucky, Lexington, KY, USA.,Institute for Advanced Application, Geisinger Health System, Danville, Pennsylvania, USA
| | - Jonathan D Suever
- Department of Pediatrics, University of Kentucky, Lexington, KY, USA.,Institute for Advanced Application, Geisinger Health System, Danville, Pennsylvania, USA
| | - Gregory J Wehner
- Department of Pediatrics, University of Kentucky, Lexington, KY, USA.,Department of Biomedical Engineering, University of Kentucky, Lexington, Kentucky, USA
| | - Kristin N Andres
- Department of Pediatrics, University of Kentucky, Lexington, KY, USA
| | - David K Powell
- Department of Biomedical Engineering, University of Kentucky, Lexington, Kentucky, USA
| | - Xiaodong Zhong
- MR R&D Collaborations, Siemens Healthcare, Atlanta, GA, USA
| | - Brandon K Fornwalt
- Department of Pediatrics, University of Kentucky, Lexington, KY, USA.,Institute for Advanced Application, Geisinger Health System, Danville, Pennsylvania, USA.,Department of Biomedical Engineering, University of Kentucky, Lexington, Kentucky, USA.,Department of Physiology, University of Kentucky, Lexington, Kentucky, USA.,Department of Medicine, University of Kentucky, Lexington, Kentucky, USA
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9
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Paul J, Divkovic E, Wundrak S, Bernhardt P, Rottbauer W, Neumann H, Rasche V. High-resolution respiratory self-gated golden angle cardiac MRI: Comparison of self-gating methods in combination with k-t SPARSE SENSE. Magn Reson Med 2014; 73:292-8. [DOI: 10.1002/mrm.25102] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Revised: 12/03/2013] [Accepted: 12/06/2013] [Indexed: 11/06/2022]
Affiliation(s)
- Jan Paul
- Department of Internal Medicine II; University Hospital of Ulm; Ulm Germany
| | - Evica Divkovic
- Department of Internal Medicine II; University Hospital of Ulm; Ulm Germany
| | - Stefan Wundrak
- Department of Internal Medicine II; University Hospital of Ulm; Ulm Germany
| | - Peter Bernhardt
- Department of Internal Medicine II; University Hospital of Ulm; Ulm Germany
| | - Wolfgang Rottbauer
- Department of Internal Medicine II; University Hospital of Ulm; Ulm Germany
| | - Heiko Neumann
- Institute of Neural Information Processing; University of Ulm; Ulm Germany
| | - Volker Rasche
- Department of Internal Medicine II; University Hospital of Ulm; Ulm Germany
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Bibliography. Cardiovascular medicine (CM). Current world literature. Curr Opin Pediatr 2012; 24:656-60. [PMID: 22954957 DOI: 10.1097/mop.0b013e328358bc78] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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