2026-07-21T14:27:00Zhttps://repisalud.isciii.es/rest/oai/requestoai:repisalud.isciii.es:20.500.12105/252272024-10-23T09:25:33Zcom_20.500.12105_15322com_20.500.12105_2051col_20.500.12105_16958
Repisalud
author
Velasco Forte, Mari Nieves
author
Pushparajah, Kuberan
author
Schaeffter, Tobias
author
Valverde Perez, Israel
author
Rhode, Kawal
author
Ruijsink, Bram
author
Alhrishy, Mazen
author
Byrne, Nicholas
author
Chiribiri, Amedeo
author
Ismail, Tevfik
author
Hussain, Tarique
author
Razavi, Reza
author
Roujol, Sébastien
2024-10-23T09:25:33Z
2024-10-23T09:25:33Z
2017-08-15
10.1186/s12968-017-0368-0
1532-429X
Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance
http://hdl.handle.net/10668/11499
28806996
https://hdl.handle.net/20.500.12105/25227
Background: 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. Methods: 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. Results: 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. Conclusions: 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.
eng
Cardiac catheterization
Congenital heart disease
Device tracking
Interventional CMR
Improved passive catheter tracking with positive contrast for CMR-guided cardiac catheterization using partial saturation (pSAT).
research article