TY - JOUR
T1 - Respiratory optimized data selection for more resilient self-navigated whole-heart coronary MR angiography
AU - Chaptinel, Jerome
AU - Piccini, Davide
AU - Bonanno, Gabriele
AU - Coppo, Simone
AU - Monney, Pierre
AU - Stuber, Matthias
AU - Schwitter, Juerg
N1 - Funding Information:
This work was supported in part by the Grant No. 320030_143923 from the Swiss National Science Foundation (SNF).
Publisher Copyright:
© 2016, ESMRMB.
PY - 2017/6/1
Y1 - 2017/6/1
N2 - Objectives: Our objective was to test a data-exclusion strategy for respiratory motion suppression by retrospectively eliminating data acquired at extreme respiratory positions for improved coronary vessel sharpness (VS) of 1-D self-navigated 3-D radial whole-heart coronary angiography acquisitions. Materials and methods: 3-D radial self-navigated acquisitions were performed on a 1.5T scanner in volunteers during free-breathing (n = 8), in coached volunteers (n = 13) who were asked to breathe in a controlled manner to mimic cardiovascular patients presenting with Cheyne-Stokes breathing, and in free-breathing patients (n = 20). Data collected during large respiratory excursions were gradually excluded retrospectively from the reconstruction yielding 14 data sets per subject on average. The impact on VS, blood and myocardium signal-to-noise and contrast-to-noise was measured. From these results, two retrospective gating strategies were defined for the k-line elimination procedure and tested in all groups. Results: Maximum right coronary artery VS improvement was +7.4 and +2.7% in coached volunteers and patients (P < 0.0001 for both), respectively, and 1.6% for the free-breathing volunteers (P = 0.13). The first gating strategy was defined as a fixed undersampling factor of 5 compared to a fully sampled 3-D radial acquisition, yielding significant VS improvement in coached volunteers and patients while myocardial signal-to-noise decreased in these. The second strategy was defined as a fixed gating window of 5.7 mm, leading to similar improvements. Conclusion: The presented strategies improve image quality of self-navigated acquisitions by retrospectively excluding data collected during end-inspiration.
AB - Objectives: Our objective was to test a data-exclusion strategy for respiratory motion suppression by retrospectively eliminating data acquired at extreme respiratory positions for improved coronary vessel sharpness (VS) of 1-D self-navigated 3-D radial whole-heart coronary angiography acquisitions. Materials and methods: 3-D radial self-navigated acquisitions were performed on a 1.5T scanner in volunteers during free-breathing (n = 8), in coached volunteers (n = 13) who were asked to breathe in a controlled manner to mimic cardiovascular patients presenting with Cheyne-Stokes breathing, and in free-breathing patients (n = 20). Data collected during large respiratory excursions were gradually excluded retrospectively from the reconstruction yielding 14 data sets per subject on average. The impact on VS, blood and myocardium signal-to-noise and contrast-to-noise was measured. From these results, two retrospective gating strategies were defined for the k-line elimination procedure and tested in all groups. Results: Maximum right coronary artery VS improvement was +7.4 and +2.7% in coached volunteers and patients (P < 0.0001 for both), respectively, and 1.6% for the free-breathing volunteers (P = 0.13). The first gating strategy was defined as a fixed undersampling factor of 5 compared to a fully sampled 3-D radial acquisition, yielding significant VS improvement in coached volunteers and patients while myocardial signal-to-noise decreased in these. The second strategy was defined as a fixed gating window of 5.7 mm, leading to similar improvements. Conclusion: The presented strategies improve image quality of self-navigated acquisitions by retrospectively excluding data collected during end-inspiration.
KW - 3-D radial
KW - Coronary angiography
KW - Motion correction
KW - Phyllotaxis
KW - Self-navigation
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U2 - 10.1007/s10334-016-0598-4
DO - 10.1007/s10334-016-0598-4
M3 - Article
C2 - 27844220
AN - SCOPUS:84995514160
SN - 0968-5243
VL - 30
SP - 215
EP - 225
JO - Magnetic Resonance Materials in Physics, Biology, and Medicine
JF - Magnetic Resonance Materials in Physics, Biology, and Medicine
IS - 3
ER -