Title |
Improved passive catheter tracking with positive contrast for CMR-guided cardiac catheterization using partial saturation (pSAT)
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Published in |
Critical Reviews in Diagnostic Imaging, August 2017
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DOI | 10.1186/s12968-017-0368-0 |
Pubmed ID | |
Authors |
Mari Nieves Velasco Forte, Kuberan Pushparajah, Tobias Schaeffter, Israel Valverde Perez, Kawal Rhode, Bram Ruijsink, Mazen Alhrishy, Nicholas Byrne, Amedeo Chiribiri, Tevfik Ismail, Tarique Hussain, Reza Razavi, Sébastien Roujol |
Abstract |
Cardiac catheterization is a common procedure in patients with congenital heart disease (CHD). Although cardiovascular magnetic resonance imaging (CMR) represents a promising alternative approach to fluoroscopy guidance, simultaneous high contrast visualization of catheter, soft tissue and the blood pool remains challenging. In this study, a novel passive tracking technique is proposed for enhanced positive contrast visualization of gadolinium-filled balloon catheters using partial saturation (pSAT) magnetization preparation. The proposed pSAT sequence uses a single shot acquisition with balanced steady-state free precession (bSSFP) readout preceded by a partial saturation pre-pulse. This technique was initially evaluated in five healthy subjects. The pSAT sequence was compared to conventional bSSFP images acquired with (SAT) and without (Non-SAT) saturation pre-pulse. Signal-to-noise ratio (SNR) of the catheter balloon, blood and myocardium and the corresponding contrast-to-noise ratio (CNR) are reported. Subjective assessment of image suitability for CMR-guidance and ideal pSAT angle was performed by three cardiologists. The feasibility of the pSAT sequence is demonstrated in two adult patients undergoing CMR-guided cardiac catheterization. The proposed pSAT approach provided better catheter balloon/blood contrast and catheter balloon/myocardium contrast than conventional Non-SAT sequences. It also resulted in better blood and myocardium SNR than SAT sequences. When averaged over all volunteers, images acquired with a pSAT angle of 20° to 40° enabled simultaneous visualization of the catheter balloon and the cardiovascular anatomy (blood and myocardium) and were found suitable for CMR-guidance in >93% of cases. The pSAT sequence was successfully used in two patients undergoing CMR-guided diagnostic cardiac catheterization. The proposed pSAT sequence offers real-time, simultaneous, enhanced contrast visualization of the catheter balloon, soft tissues and blood. This technique provides improved passive tracking capabilities during CMR-guided catheterization in patients. |
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Geographical breakdown
Country | Count | As % |
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United States | 4 | 50% |
Netherlands | 1 | 13% |
Ecuador | 1 | 13% |
Unknown | 2 | 25% |
Demographic breakdown
Type | Count | As % |
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Members of the public | 6 | 75% |
Science communicators (journalists, bloggers, editors) | 1 | 13% |
Scientists | 1 | 13% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
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Unknown | 35 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
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Other | 5 | 14% |
Researcher | 5 | 14% |
Student > Ph. D. Student | 3 | 9% |
Lecturer > Senior Lecturer | 2 | 6% |
Student > Postgraduate | 2 | 6% |
Other | 8 | 23% |
Unknown | 10 | 29% |
Readers by discipline | Count | As % |
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Medicine and Dentistry | 10 | 29% |
Engineering | 3 | 9% |
Business, Management and Accounting | 1 | 3% |
Nursing and Health Professions | 1 | 3% |
Computer Science | 1 | 3% |
Other | 5 | 14% |
Unknown | 14 | 40% |