Measurements of left ventricular dimensions using real-time acquisition in cardiac magnetic resonance imaging: comparison with conventional gradient echo imaging |
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Authors: | Plein S Smith W H Ridgway J P Kassner A Beacock D J Bloomer T N Sivananthan M U |
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Affiliation: | (1) Cardiac Magnetic Resonance Unit, Room 170, D-floor. Jubilee Building, The Yorkshire Heart Centre, The General Infirmary at Leeds Great George Street, LS1 3 EX Leeds, UK;(2) Department of Medical Physics, The General Infirmary at Leeds, Great George Street, LS1 3EX Leeds, UK;(3) Philips Medical Systems, W 6 0LJ Hammersmith, London, UK |
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Abstract: | This study investigates the use of real-time acquisition in cardiac magnetic resonance imaging (MRI) for measurements of left
ventricular dimensions in comparison with conventional gradient echo acquisition. Thirty-one subjects with a variety of left
ventricular morphologies to represent a typical clinical population were studied. Short-axis data sets of the left ventricle
(LV) were acquired using a conventional turbo-gradient echo and an ultrafast hybrid gradient echo/echo planar sequence with
acquisition in real-time. End-diastolic volume (EDV), end-systolic volume (ESV), ejection fraction (EF) and left ventricular
mass (LV mass) were measured. The agreement between the two acquisitions and interobserver, intraobserver and interstudy variabilities
were determined. The bias between the two methods was 5.86 ml for EDV, 0.23 ml for ESV and 0.94% for EF. LV mass measurements
were significantly lower with the real-time method (mean bias 14.38 g). This is likely to be the result of lower spatial resolution
and chemical shift artefacts with the real-time method. Interobserver, intraobserver and interstudy variabilities were low
for all parameters. In conclusion, real time acquisition in MRI can provide accurate and reproducible measurements of LV dimensions
in subjects with normal as well as abnormal LV morphologies, but LV mass measurements were lower than with conventional gradient
echo imaging.
Presented in abstract form at the International Society of Magnetic Resonance in Medicine meeting in Denver, Colorado in April
2000. |
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Keywords: | Real-time acquisition Cardiac magnetic resonance imaging (MRI) Left ventricular dimensions |
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