Quantitating aortic regurgitation by cardiovascular magnetic resonance: significant variations due to slice location and breath holding.

Abstract:

OBJECTIVES:Compare variability in flow measurements by phase contrast MRI, performed at different locations in the aorta and pulmonary artery (PA) using breath-held (BH) and free-breathing (FB) sequences. METHODS:Fifty-seven patients with valvular heart disease, confirmed by echocardiography, were scanned using BH technique at 3 locations in the ascending aorta (SOV = sinus of Valsalva, STJ = sinotubular junction, ASC = ascending aorta at level of right pulmonary artery) and 2 locations in PA. Single FB measurement was obtained at STJ for aorta. Obtained metrics (SV = stroke volume, FV = forward volume, BV = backward volume, RF = regurgitant fraction) were evaluated separately for patients with aortic regurgitation (AR, n = 31) and mitral regurgitation (n = 26). RESULTS:No difference was noted between the two measurements in the PA. Significant differences were noted in measured SV at different aortic locations. SV measurements obtained at ASC correlated best with the measurements obtained in the PA. Strongest correlation of AR was measured at the STJ. CONCLUSION:Measurements of flow volumes by phase contrast MRI differ depending on slice location. When using stroke volumes to calculate pulmonary to systemic blood flow ratio (Qp/Qs), ASC should be used. For quantifying aortic regurgitation, measurement should be obtained at STJ. KEY POINTS:• Aortic regurgitation can be accurately measured by MRI. • Aortic regurgitation measurement by MRI varies according to the location where measured. • Aortic regurgitation can also be measured by MRI without breath hold.

journal_name

Eur Radiol

journal_title

European radiology

authors

Chaturvedi A,Hamilton-Craig C,Cawley PJ,Mitsumori LM,Otto CM,Maki JH

doi

10.1007/s00330-015-4120-6

subject

Has Abstract

pub_date

2016-09-01 00:00:00

pages

3180-9

issue

9

eissn

0938-7994

issn

1432-1084

pii

10.1007/s00330-015-4120-6

journal_volume

26

pub_type

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