Davide Piccini1,2,3, Gabriele Bonanno2,3, Giulia Ginami2,3, Arne Littmann4, Michael O Zenge4, Matthias Stuber2,3. 1. Advanced Clinical Imaging Technology, Siemens Healthcare, Lausanne, Switzerland. 2. Center for Biomedical Imaging (CIBM), Lausanne, Switzerland. 3. Department of Radiology, University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland. 4. Healthcare Sector, Siemens AG, Erlangen, Germany.
Abstract
PURPOSE: To test the direct influence of the reference respiratory position on image quality for self-navigated whole-heart coronary MRI. METHODS: Self-navigated whole-heart coronary MRI was performed in 11 healthy adult subjects. Respiratory motion was compensated for by using three different respiratory reference positions of the heart: end-inspiratory, end-expiratory, and the mean of the entire respiratory excursion. All datasets were reconstructed without motion compensation for comparison. Image quality was assessed in all reconstructions using signal-to-noise ratio (SNR) and contrst-to-noise ratio (CNR) measurements, as well as percentage vessel sharpness and visible length of the coronary arteries. RESULTS: While SNR and CNR remained close to constant in all reconstructions, a clear and significant improvement in vessel sharpness was identified in all motion corrected datasets with respect to their uncorrected counterpart (e.g., percentage sharpness of the proximal right coronary artery (RCA): 61.6 ± 8.2% for end-inspiration, 64.1 ± 10.7% for end-expiration, and 63.3 ± 7.0% for the mean respiratory position versus 55.0 ± 10.4 for the uncorrected datasets; P < 0.05). Among all motion corrected reconstructions, the use of an end-expiratory reference position most consistently provided the highest image quality. In particular, some of the improvements in vessel sharpness and length measured for end-expiration were statistically significant with respect to the reconstructions performed at end-inspiration (e.g., percentage sharpness of the proximal left anterior descending coronary: 58.2 ± 7.4% versus 55.8 ± 8.4%; P < 0.05; and visible length of the RCA: 125.7 ± 25.9 mm versus 114.4 ± 27.4 mm; P < 0.05). CONCLUSION: The use of end-expiration as a reference position for respiratory motion correction in free-breathing self-navigated whole heart coronary MRA significantly improves image quality. J
PURPOSE: To test the direct influence of the reference respiratory position on image quality for self-navigated whole-heart coronary MRI. METHODS: Self-navigated whole-heart coronary MRI was performed in 11 healthy adult subjects. Respiratory motion was compensated for by using three different respiratory reference positions of the heart: end-inspiratory, end-expiratory, and the mean of the entire respiratory excursion. All datasets were reconstructed without motion compensation for comparison. Image quality was assessed in all reconstructions using signal-to-noise ratio (SNR) and contrst-to-noise ratio (CNR) measurements, as well as percentage vessel sharpness and visible length of the coronary arteries. RESULTS: While SNR and CNR remained close to constant in all reconstructions, a clear and significant improvement in vessel sharpness was identified in all motion corrected datasets with respect to their uncorrected counterpart (e.g., percentage sharpness of the proximal right coronary artery (RCA): 61.6 ± 8.2% for end-inspiration, 64.1 ± 10.7% for end-expiration, and 63.3 ± 7.0% for the mean respiratory position versus 55.0 ± 10.4 for the uncorrected datasets; P < 0.05). Among all motion corrected reconstructions, the use of an end-expiratory reference position most consistently provided the highest image quality. In particular, some of the improvements in vessel sharpness and length measured for end-expiration were statistically significant with respect to the reconstructions performed at end-inspiration (e.g., percentage sharpness of the proximal left anterior descending coronary: 58.2 ± 7.4% versus 55.8 ± 8.4%; P < 0.05; and visible length of the RCA: 125.7 ± 25.9 mm versus 114.4 ± 27.4 mm; P < 0.05). CONCLUSION: The use of end-expiration as a reference position for respiratory motion correction in free-breathing self-navigated whole heart coronary MRA significantly improves image quality. J
Authors: Moritz H Albrecht; Akos Varga-Szemes; U Joseph Schoepf; Georg Apfaltrer; Jiaqian Xu; Kwang-Nam Jin; Anthony M Hlavacek; Shahryar M Chowdhury; Pal Suranyi; Christian Tesche; Carlo N De Cecco; Davide Piccini; Matthias Stuber; Giulia Ginami; Thomas J Vogl; Arni Nutting Journal: Eur Radiol Date: 2017-09-08 Impact factor: 5.315
Authors: Jieying Luo; Nii Okai Addy; R Reeve Ingle; Corey A Baron; Joseph Y Cheng; Bob S Hu; Dwight G Nishimura Journal: Magn Reson Med Date: 2016-05-13 Impact factor: 4.668