On the optimal temporal resolution for phase contrast cardiovascular magnetic resonance imaging: establishment of baseli
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(2020) 22:72
RESEARCH
Open Access
On the optimal temporal resolution for phase contrast cardiovascular magnetic resonance imaging: establishment of baseline values Francesco Santini1,2* , Michele Pansini3, Maja Hrabak-Paar4, Denise Yates5, Thomas H. Langenickel6,7, Jens Bremerich8, Oliver Bieri1,2 and Tilman Schubert9
Abstract Background: The aim of this study is to quantify the frequency content of the blood velocity waveform in different body regions by means of phase contrast (PC) cardiovascular magnetic resonance (CMR) and Doppler ultrasound. The highest frequency component of the spectrum is inversely proportional to the ideal temporal resolution to be used for the acquisition of flow-sensitive imaging (Shannon-Nyquist theorem). Methods: Ten healthy subjects (median age 33y, range 24–40) were scanned with a high-temporal-resolution PCCMR and with Doppler ultrasound on three body regions (carotid arteries, aorta and femoral arteries). Furthermore, 111 patients (median age 61y) with mild to moderate arterial hypertension and 58 patients with aortic aregurgitation, atrial septal defect, or repaired tetralogy of Fallot underwent aortic CMR scanning. The frequency power distribution was calculated for each location and the maximum frequency component, fmax, was extracted and expected limits for the general population were inferred. Results: In the healthy subject cohort, significantly different fmax values were found across the different body locations, but they were nonsignificant across modalities. No significant correlation was found with heart rate. The measured fmax ranged from 7.7 ± 1.1 Hz in the ascending aorta, up to 12.3 ± 5.1 Hz in the femoral artery (considering PC-CMR data). The calculated upper boundary for the general population ranged from 11.0 Hz to 27.5 Hz, corresponding to optimal temporal resolutions of 45 ms and 18 ms, respectively. The patient cohort exhibited similar values for the frequencies in the aorta, with no correlation between blood pressure and frequency content. Conclusions: The temporal resolution of PC-CMR acquisitions can be adapted based on the scanned body region and in the adult population, should approach approximately 20 ms in the peripheral arteries and 40 ms in the aorta. Trial registration: This study presents results from a restrospective analysis of the clinical study NCT01870739 (ClinicalTrials.gov). Keywords: Phase contrast MRI, Doppler ultrasound, Frequency content, Temporal resolution
* Correspondence: [email protected] 1 Department of Radiology, Division of Radiological Physics, University Hospital Basel, Petersgraben 4, 4031 Basel, Switzerland 2 Department of Biomedical Engineering, University of Basel, Allschwil, Switzerland Full list of author information is available at the end of the article © The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to
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