Abstract
Faster periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) diffusion-weighted imaging acquisitions, such as Turboprop and X-prop, remain subject to phase errors inherent to a gradient echo readout, which ultimately limits the applied turbo factor (number of gradient echoes between each pair of radiofrequency refocusing pulses) and, thus, scan time reductions. This study introduces a new phase correction to Turboprop, called Turboprop+. This technique employs calibration blades, which generate 2-D phase error maps and are rotated in accordance with the data blades, to correct phase errors arising from off-resonance and system imperfections. The results demonstrate that with a small increase in scan time for collecting calibration blades, Turboprop+ had a superior immunity to the off-resonance-related artifacts when compared to standard Turboprop and recently proposed X-prop with the high turbo factor (turbo factor = 7). Thus, low specific absorption rate and short scan time can be achieved in Turboprop+ using a high turbo factor, whereas off-resonance related artifacts are minimized.
Original language | English (US) |
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Pages (from-to) | 497-503 |
Number of pages | 7 |
Journal | Magnetic Resonance in Medicine |
Volume | 70 |
Issue number | 2 |
DOIs | |
State | Published - Aug 2013 |
Keywords
- Turboprop
- diffusion-weighted imaging
- gradient and spin echo
- off-resonance
- periodically rotated overlapping parallel lines with enhanced reconstruction
- phase correction
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging