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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
medicine
Free-breathing T2∗ mapping using respiratory motion corrected averaging
Journal of Cardiovascular Magnetic Resonance, Volume 17, No. 1, Article 3, Year 2015
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Description
Background: Pixel-wise T2∗ maps based on breath-held segmented image acquisition are prone to ghost artifacts in instances of poor breath-holding or cardiac arrhythmia. Single shot imaging is inherently immune to ghost type artifacts. We propose a free-breathing method based on respiratory motion corrected single shot imaging with averaging to improve the signal to noise ratio. Methods: Images were acquired using a multi-echo gradient recalled echo sequence and T2∗ maps were calculated at each pixel by exponential fitting. For 40 subjects (2 cohorts), two acquisition protocols were compared: (1) a breath-held, segmented acquisition, and (2) a free-breathing, single-shot multiple repetition respiratory motion corrected average. T2∗ measurements in the interventricular septum and liver were compared for the 2-methods in all studies with diagnostic image quality. Results: In cohort 1 (N = 28) with age 51.4 ± 17.6 (m ± SD) including 1 subject with severe myocardial iron overload, there were 8 non-diagnostic breath-held studies due to poor image quality resulting from ghost artifacts caused by respiratory motion or arrhythmias. In cohort 2 (N = 12) with age 30.9 ± 7.5 (m ± SD), including 7 subjects with severe myocardial iron overload and 4 subjects with mild iron overload, a single subject was unable to breath-hold. Free-breathing motion corrected T2∗ maps were of diagnostic quality in all 40 subjects. T2∗ measurements were in excellent agreement (In cohort #1, T2∗FB = 0.95 x T2∗BH + 0.41, r2 = 0.93, N = 39 measurements, and in cohort #2, T2∗FB = 0.98 x T2∗BH + 0.05, r2 > 0.99, N = 22 measurements). Conclusions: A free-breathing approach to T2∗ mapping is demonstrated to produce consistently good quality maps in the presence of respiratory motion and arrhythmias. © 2015 Kellman et al.
Authors & Co-Authors
Spottiswoode, Bruce S.
United States, New York
Siemens Usa
Abdel-Gadir, Amna
United Kingdom, London
University College London Hospitals Nhs Foundation Trust
Treibel, Thomas Alexander
United Kingdom, London
University College London Hospitals Nhs Foundation Trust
Pennell, Dudley John
United Kingdom, London
Royal Brompton Hospital
Statistics
Citations: 31
Authors: 4
Affiliations: 4
Identifiers
Doi:
10.1186/s12968-014-0106-9
ISSN:
10976647
Research Areas
Noncommunicable Diseases
Study Design
Cohort Study