PURPOSE: To evaluate the performance of four 3D-ToF magnetic resonance angiography (MRA) sequences with and without integrated parallel acquisition techniques (iPAT) at 1.5T and 3.0T in imaging intracranial vessels. MATERIAL AND METHODS: Seven volunteers and 5 patients (4 aneurysms, 1 AVM) underwent 3D-ToF-MRA at 1.5T (Magnetom Sonata) and 3.0T (Magnetom Trio) with and without parallel acquisition techniques (iPAT) using similarly designed 8-channel phased-array head coils. Imaging time of the pulse sequences was set to 7.15 and 7.35 min, respectively. Images were analyzed quantitatively by calculating signal-to-noise (SNR) and contrast-to-noise (CNR) ratios of proximal M2 segments and qualitatively by using a 5-point scale. RESULTS: SNR and CNR were significantly higher for both 3D-ToF sequences at 3.0T compared with both pulse sequences at 1.5T. The highest SNR and CNR were obtained at 3.0T without iPAT. However, because of a higher spatial resolution (matrix 512 x 640) visualization of small vessel details was best at 3.0T with iPAT. CONCLUSION: Intracranial 3D-ToF-MRA at 3.0T offers superior image quality compared with 1.5T, particular in the delineation of smaller vessels. In contrast to 1.5T, implementation of iPAT at 3.0T is of additional benefit since the high SNR available at 3.0T allows for higher spatial resolution without prolongation of measurement time.
PURPOSE: To evaluate the performance of four 3D-ToF magnetic resonance angiography (MRA) sequences with and without integrated parallel acquisition techniques (iPAT) at 1.5T and 3.0T in imaging intracranial vessels. MATERIAL AND METHODS: Seven volunteers and 5 patients (4 aneurysms, 1 AVM) underwent 3D-ToF-MRA at 1.5T (Magnetom Sonata) and 3.0T (Magnetom Trio) with and without parallel acquisition techniques (iPAT) using similarly designed 8-channel phased-array head coils. Imaging time of the pulse sequences was set to 7.15 and 7.35 min, respectively. Images were analyzed quantitatively by calculating signal-to-noise (SNR) and contrast-to-noise (CNR) ratios of proximal M2 segments and qualitatively by using a 5-point scale. RESULTS: SNR and CNR were significantly higher for both 3D-ToF sequences at 3.0T compared with both pulse sequences at 1.5T. The highest SNR and CNR were obtained at 3.0T without iPAT. However, because of a higher spatial resolution (matrix 512 x 640) visualization of small vessel details was best at 3.0T with iPAT. CONCLUSION: Intracranial 3D-ToF-MRA at 3.0T offers superior image quality compared with 1.5T, particular in the delineation of smaller vessels. In contrast to 1.5T, implementation of iPAT at 3.0T is of additional benefit since the high SNR available at 3.0T allows for higher spatial resolution without prolongation of measurement time.
Authors: Joanna M Wardlaw; Will Brindle; Ana M Casado; Kirsten Shuler; Moira Henderson; Brenda Thomas; Jennifer Macfarlane; Susana Muñoz Maniega; Katherine Lymer; Zoe Morris; Cyril Pernet; William Nailon; Trevor Ahearn; Abdul Nashirudeen Mumuni; Carlos Mugruza; John McLean; Goultchira Chakirova; Yuehui Terry Tao; Johanna Simpson; Andrew C Stanfield; Harriet Johnston; Jehill Parikh; Natalie A Royle; Janet De Wilde; Mark E Bastin; Nick Weir; Andrew Farrall; Maria C Valdes Hernandez Journal: Eur Radiol Date: 2012-06-09 Impact factor: 5.315
Authors: C G Choi; D H Lee; J H Lee; H W Pyun; D W Kang; S U Kwon; J K Kim; S J Kim; D C Suh Journal: AJNR Am J Neuroradiol Date: 2007-03 Impact factor: 3.825
Authors: Karsten H Wrede; Philipp Dammann; Christoph Mönninghoff; Sören Johst; Stefan Maderwald; I Erol Sandalcioglu; Oliver Müller; Neriman Özkan; Mark E Ladd; Michael Forsting; Marc U Schlamann; Ulrich Sure; Lale Umutlu Journal: PLoS One Date: 2014-01-06 Impact factor: 3.240
Authors: Karsten H Wrede; Sören Johst; Philipp Dammann; Neriman Özkan; Christoph Mönninghoff; Markus Kraemer; Stefan Maderwald; Mark E Ladd; Ulrich Sure; Lale Umutlu; Marc Schlamann Journal: PLoS One Date: 2014-09-18 Impact factor: 3.240