Abstract
Sensitivity encoding (SENSE) and partial Fourier (PF) techniques both reduce MRI acquisition time. Two-dimensional SENSE uses coil sensitivities to unfold aliasing in the phase/ slice-encoding plane. One-dimensional PF and homodyne reconstruction are routinely applied in the frequency/phase-encoding plane to compensate for nonsampled k-space of the presumed real magnetization. Recently, a modified 3D elliptical centric acquisition was proposed to facilitate 2D-PF and homodyne reconstruction on an undersampled phase/slice-encoding plane. In this work we hypothesized that this 2D-PF technique can be combined with 2D-SENSE to achieve a greater acceleration factor than what each method can provide separately. Reconstruction of data whereby SENSE and PF are applied along the same axes is described. Contrast-enhanced MR angiography (CE-MRA) results from experiments using four receiver coils in phantom and volunteer studies are shown. In 11 volunteer studies, the SENSE-PF-homodyne technique using sevenfold acceleration (4× SENSE, 1.7× PF) consistently provided high-diagnostic-quality images with near 1-mm isotropic resolution in acquisition times of <20 s.
Original language | English (US) |
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Pages (from-to) | 16-22 |
Number of pages | 7 |
Journal | Magnetic Resonance in Medicine |
Volume | 55 |
Issue number | 1 |
DOIs | |
State | Published - Jan 2006 |
Keywords
- 2D-SENSE
- 2D-homodyne
- 2D-partial Fourier
- Contrast-enhanced MR angiography
- Fast MRI
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging