PURPOSE: To assess the efficacy of a modified electrocardiograph (EKG)-triggered black-blood T1W (T1W) spin-echo sequence in improving contrast on post-gadolinium high-resolution carotid plaque imaging by implementing heart-rate-independent contrast preparation. MATERIALS AND METHODS: We used a standard EKG-triggered double inversion-recovery (DIR) turbo spin-echo (TSE) sequence modified with the addition of an extra saturation (90 degrees ) radio frequency (RF) pulse placed immediately after the DIR module, shortening the repetition time to a fixed value of 400 msec. A total of 10 patients with atherosclerotic disease were included in the study. Postinjection intraplaque contrast measurements were performed on each patient for the standard and the modified sequence. RESULTS: Post-gadolinium-injection intraplaque contrast was 31.7 +/- 12.8% with the standard T1W sequence (nT1-TSE), and 45.3 +/- 17.2% with the modified T1W sequence (mT1-TSE), showing a significant contrast enhancement of 13.6% (P < 0.001) without significant image quality modification. CONCLUSION: The addition of a RF pulse to the standard EKG-triggered T1W TSE sequence increased intraplaque contrast without increasing sequence acquisition time. Furthermore, it appeared to be a robust technique, easy to implement on clinical scanners. (c) 2008 Wiley-Liss, Inc.
PURPOSE: To assess the efficacy of a modified electrocardiograph (EKG)-triggered black-blood T1W (T1W) spin-echo sequence in improving contrast on post-gadolinium high-resolution carotid plaque imaging by implementing heart-rate-independent contrast preparation. MATERIALS AND METHODS: We used a standard EKG-triggered double inversion-recovery (DIR) turbo spin-echo (TSE) sequence modified with the addition of an extra saturation (90 degrees ) radio frequency (RF) pulse placed immediately after the DIR module, shortening the repetition time to a fixed value of 400 msec. A total of 10 patients with atherosclerotic disease were included in the study. Postinjection intraplaque contrast measurements were performed on each patient for the standard and the modified sequence. RESULTS: Post-gadolinium-injection intraplaque contrast was 31.7 +/- 12.8% with the standard T1W sequence (nT1-TSE), and 45.3 +/- 17.2% with the modified T1W sequence (mT1-TSE), showing a significant contrast enhancement of 13.6% (P < 0.001) without significant image quality modification. CONCLUSION: The addition of a RF pulse to the standard EKG-triggered T1W TSE sequence increased intraplaque contrast without increasing sequence acquisition time. Furthermore, it appeared to be a robust technique, easy to implement on clinical scanners. (c) 2008 Wiley-Liss, Inc.
Authors: Monica Sigovan; Clément Bidet; Sébastien Bros; Loic Boussel; Laura Mechtouff; Philip M Robson; Zahi A Fayad; Antoine Millon; Philippe Douek Journal: Magn Reson Imaging Date: 2017-06-16 Impact factor: 2.546
Authors: Y Sato; K Ogasawara; S Narumi; M Sasaki; A Saito; E Tsushima; T Namba; M Kobayashi; K Yoshida; Y Terayama; A Ogawa Journal: AJNR Am J Neuroradiol Date: 2016-02-04 Impact factor: 3.825