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- Title
Fetal blood flow velocimetry by phase-contrast MRI using a new triggering method and comparison with Doppler ultrasound in a sheep model: a pilot study.
- Authors
Schoennagel, Bjoern; Remus, Chressen; Yamamura, Jin; Kording, Fabian; Sousa, Manuela; Hecher, Kurt; Fischer, Roland; Ueberle, Friedrich; Boehme, Matthias; Adam, Gerhard; Kooijman, Hendrik; Wedegaertner, Ulrike
- Abstract
Object: We present the first study demonstrating the feasibility of antenatal blood flow velocimetry performing ECG triggered phase-contrast (PC)-MRI in the fetal aorta by using a newly developed Doppler ultrasound trigger. Materials and methods: Five pregnant sheep carrying singleton fetuses (gestational age 121 days) were anesthetized to undergo fetal 2D PC-MRI in the fetal descending aorta (1.5 T) using a newly developed MR-compatible Doppler ultrasound trigger for fetal cardiac triggering. Inter-operator variability was assessed for PC-MR measurements and reproducibility was tested by repeated scans in one fetus. Inter-modality comparison was performed by Doppler ultrasound velocimetry. Results: Fetal cardiac triggering was possible in all examinations. PC-MR velocimetry revealed a mean inter-operator variability of 3 ± 5 %. Average peak systolic flow velocities of 62.5 ± 4.4 cm/s were in good agreement with Doppler ultrasound measurements of 62.0 ± 9.2 cm/s ( p (Lord's U test) ≫ 0.05). Conclusion: Fetal PC-MR velocimetry was successfully performed using the newly developed MR-compatible Doppler ultrasound trigger for intrauterine fetal cardiac triggering, demonstrating high inter-operator and inter-modality agreement. This new method has the high potential for alternative assessment of hemodynamic decompensation of the fetal circulation.
- Subjects
BLOOD flow measurement; VELOCIMETRY; PHASE contrast magnetic resonance imaging; DOPPLER ultrasonography; OBSTETRICS
- Publication
MAGMA: Magnetic Resonance Materials in Physics, Biology & Medicine, 2014, Vol 27, Issue 3, p237
- ISSN
0968-5243
- Publication type
Article
- DOI
10.1007/s10334-013-0397-0