We sought to evaluate Periodically Rotated Overlapping ParallEL Lines with Enhanced Reconstruction (PROPELLER
; BLADE) data acquisition in comparison with standard k
-space sampling techniques for axial and sagittal brain
imaging at 3 T regarding imaging artifacts.
Material and Methods:
Forty patients who gave consent were included in a prospective comparison of standard and PROPELLER
-space sampling techniques. All examinations were performed at 3 T with comparison of standard T2-weighted fluid-attenuated inversion recovery (FLAIR) to PROPELLER
T2-weighted FLAIR in the axial image orientation and standard T1-weighted gradient echo to PROPELLER
T1-weighted FLAIR in the sagittal image orientation. Imaging protocols were matched for spatial resolution, with data evaluation performed by 2 experienced neuroradiologists. Image data were compared regarding various image artifacts and overall image quality. Reader agreement was assessed by Cohen's kappa statistics.
T2-weighted axial data acquisition showed significantly less pulsation and Gibb's artifacts than the standard T2-weighted scan. Even without motion correction, the frequency of ghosting (motion) artifacts was substantially lower in the PROPELLER
T2-weighted data and readers concordantly (κ = 1) rated PROPELLER
as better than or equal to the standard T2-weighted scan in the majority of cases (95%; P
< 0.0001). In the comparison of sagittal T1-weighted data sets, readers showed only fair agreement (κ = 0.24) and noted consistent wrap artifacts in PROPELLER
(BLADE) brain magnetic resonance
imaging is also applicable at 3 T. In addition to minimizing motion artifacts, the PROPELLER
acquisition scheme reduces other magnetic resonance
artifacts that would otherwise degrade scan quality.