PURPOSE: To test the hypothesis that respiration effects in three-dimensional (3D) coronary magnetic resonance (MR) imaging can be reduced with navigator-echo-based gating or triggering according to the superior-inferior position of the diaphragm. MATERIALS AND METHODS: Real-time respiratory gating and respiratory triggering (breath hold with feedback) were implemented with navigator echoes in a magnetization-prepared, segmented, 3D coronary imaging sequence. The two techniques were first tested with a motion phantom. An imaging protocol that compared real-time respiratory-gated acquisition, real-time respiratory-triggered acquisition, and continuous acquisition was then evaluated in six healthy subjects. RESULTS: Real-time respiratory-gated and respiratory-triggered acquisition were superior to continuous acquisition with two signals averaged (P = .025). The performance of the gated acquisition was about the same as that of the triggered acquisition (P = .05). CONCLUSION: Navigator-echo-based, real-time respiratory-gating and respiratory-triggering techniques are practical methods for effective reduction of respiration effects in coronary MR imaging.
PURPOSE: To test the hypothesis that respiration effects in three-dimensional (3D) coronary magnetic resonance (MR) imaging can be reduced with navigator-echo-based gating or triggering according to the superior-inferior position of the diaphragm. MATERIALS AND METHODS: Real-time respiratory gating and respiratory triggering (breath hold with feedback) were implemented with navigator echoes in a magnetization-prepared, segmented, 3D coronary imaging sequence. The two techniques were first tested with a motion phantom. An imaging protocol that compared real-time respiratory-gated acquisition, real-time respiratory-triggered acquisition, and continuous acquisition was then evaluated in six healthy subjects. RESULTS: Real-time respiratory-gated and respiratory-triggered acquisition were superior to continuous acquisition with two signals averaged (P = .025). The performance of the gated acquisition was about the same as that of the triggered acquisition (P = .05). CONCLUSION: Navigator-echo-based, real-time respiratory-gating and respiratory-triggering techniques are practical methods for effective reduction of respiration effects in coronary MR imaging.
Authors: R J van Geuns; H G de Bruin; B J Rensing; P A Wielopolski; M D Hulshoff; P M van Ooijen; M Oudkerk; P J de Feyter Journal: Heart Date: 1999-10 Impact factor: 5.994
Authors: T Delzescaux; F Frouin; A De Cesare; S Philipp-Foliguet; R Zeboudj; M Janier; A Todd-Pokropek; A Herment Journal: MAGMA Date: 2001-08 Impact factor: 2.310
Authors: M Hackenbroch; K Nehrke; J Gieseke; C Meyer; K Tiemann; H Litt; O Dewald; C P Naehle; H Schild; T Sommer Journal: Eur Radiol Date: 2005-04-07 Impact factor: 5.315
Authors: Thanh D Nguyen; Pascal Spincemaille; Matthew D Cham; Jonathan W Weinsaft; Martin R Prince; Yi Wang Journal: J Magn Reson Imaging Date: 2008-08 Impact factor: 4.813