Evaluation of a Portable Doppler Ultrasound Gating Device for Fetal Cardiac MR Imaging: Initial Results at 1.5T and 3T
| Autor: | Christian Ruprecht, Jin Yamamura, F Kording, Bjoern P. Schoennagel, K Fehrs, Manuela Tavares de Sousa, Gerhard Adam |
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| Rok vydání: | 2018 |
| Předmět: |
Heartbeat
Fetal heart Gating Doppler echocardiography Doppler ultrasound 030218 nuclear medicine & medical imaging 03 medical and health sciences Fetal Heart 0302 clinical medicine Pregnancy Humans magnetic resonance imaging Medicine Radiology Nuclear Medicine and imaging Cardiac imaging Fetus medicine.diagnostic_test Phantoms Imaging business.industry Magnetic resonance imaging Echocardiography Doppler embryonic structures cardiovascular system Female business Major Paper 030217 neurology & neurosurgery Biomedical engineering |
| Zdroj: | Magnetic Resonance in Medical Sciences |
| ISSN: | 1880-2206 1347-3182 |
| Popis: | Purpose: Fetal cardiac MRI has the potential to play an important role in the assessment of fetal cardiac pathologies, but it is up to now not feasible due to a missing gating method. The purpose of this work was the evaluation of Doppler ultrasound (DUS) for external fetal cardiac gating with regard to compatibility, functionality, and reliability. Preliminary results were assessed performing fetal cardiac MRI. Methods: An MRI conditional DUS device was developed to obtain a gating signal from the fetal heart. The MRI compatibility was evaluated at 1.5T and 3T using B1 field maps and gradient echo images. The quality and sensitivity of the DUS device to detect the fetal heart motion for cardiac gating were evaluated outside the MRI room in 15 fetuses. A dynamic fetal cardiac phantom was employed to evaluate distortions of the DUS device and gating signal due to electromagnetic interferences at 1.5T and 3T. In the first in vivo experience, dynamic fetal cardiac images were acquired in four-chamber view at 1.5T and 3T in two fetuses. Results: The maximum change in the B1 field and signal intensity with and without the DUS device was |
| Databáze: | OpenAIRE |
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