Dual-polarity slice-GRAPPA for concurrent ghost correction and slice separation in simultaneous multi-slice EPI
نویسندگان
چکیده
منابع مشابه
Dual-polarity slice-GRAPPA for concurrent ghost correction and slice separation in simultaneous multi-slice EPI.
PURPOSE A ghost correction strategy for Simultaneous Multi-Slice (SMS) EPI methods that provides improved ghosting artifact reduction compared to conventional methods is presented. Conventional Nyquist ghost correction methods for SMS-EPI rely on navigator data that contain phase errors from all slices in the simultaneously acquired slice-group. These navigator data may contain spatially nonlin...
متن کاملSimultaneous Multi-Slice (Slice Accelerated) Diffusion EPI: Early Experience for Brain Ischemia and Cervical Lymphadenopathy
In single shot EPI, the entirety of k-space is traversed after one shot (excitation). Readout-segmentation acquires k-space in multiple shots for reduced TE and encoding time. Real-time reacquisition of unusable shots is also supported. The result is markedly improved image quality, with reduced susceptibility artifact and image blur. The challenge with this approach, termed RESOLVE, is the lon...
متن کاملDual-Polarity GRAPPA for simultaneous reconstruction and ghost correction of EPI data
Purpose: We seek improved image quality from accelerated EPI data, particularly at ultra-high field. Certain artifacts in EPI reconstructions can be attributed to nonlinear phase differences between data acquired using frequency encoding gradients of alternating polarity. These errors appear near regions of local susceptibility gradients, and typically cannot be corrected with conventional Nyqu...
متن کاملSlice-by-slice motion correction in spinal cord fMRI: SliceCorr
Introduction Subject motion in functional magnetic resonance imaging (fMRI) is highly problematic for the detection of responses showing small effect size and/or spatially extent. To mitigate this problem, various methods have been proposed to correct this type of motion a posteriori. These methods correct each volume using a 3D rigid-body matrix having six parameters for translation and rotati...
متن کاملSOMS: Simultaneous Orthogonal Multi- Slice Imaging
Simultaneous multi -s l ice (SMS) MRI has become a popular technique in both research and cl inical practice, as i t provides information about multiple sl ices at the time of a conventional s ingle-sl ice measurement. For technical reasons, SMS is commonly l imited to the acquisi tion of paral lel s l ices. Here, we propose a new Cartesian sequence for the simultaneous excitation of orthogonal...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2018
ISSN: 0740-3194
DOI: 10.1002/mrm.27113