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Using adiabatic inversion pulses for long-T2 suppression in ultrashort echo time (UTE) imaging
| Content Provider | Scilit |
|---|---|
| Author | Larson, Peder E. Z. Conolly, Steven M. Pauly, John M. Nishimura, Dwight G. |
| Copyright Year | 2007 |
| Description | Journal: Magnetic Resonance in Medicine Ultrashort echo time (UTE) imaging is a technique that can visualize tissues with sub‐millisecond $T_{2}$ values that have little or no signal in conventional MRI techniques. The $short‐T_{2}$ tissues, which include tendons, menisci, calcifications, and cortical bone, are often obscured by $long‐T_{2}$ tissues. This paper introduces a new method of $long‐T_{2}$ component suppression based on adiabatic inversion pulses that significantly improves the contrast of $short‐T_{2}$ tissues. Narrow bandwidth inversion pulses are used to selectively invert only $long‐T_{2}$ components. These components are then suppressed by combining images prepared with and without inversion pulses. Fat suppression can be incorporated by combining images with the pulses applied on the fat and water resonances. Scaling factors must be used in the combination to compensate for relaxation during the preparation pulses. The suppression is insensitive to RF inhomogeneities because it uses adiabatic inversion pulses. Simulations and phantom experiments demonstrate the adiabatic pulse contrast and how the scaling factors are chosen. In vivo 2D UTE images in the ankle and lower leg show excellent, robust $long‐T_{2}$ suppression for visualization of cortical bone and tendons. Magn Reson Med 58:952–961, 2007. |
| Related Links | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2942769/pdf |
| Ending Page | 961 |
| Page Count | 10 |
| Starting Page | 952 |
| e-ISSN | 15222594 |
| DOI | 10.1002/mrm.21341 |
| Journal | Magnetic Resonance in Medicine |
| Issue Number | 5 |
| Volume Number | 58 |
| Language | English |
| Publisher | Wiley-Blackwell |
| Publisher Date | 2007-10-29 |
| Access Restriction | Open |
| Subject Keyword | Journal: Magnetic Resonance in Medicine Radiology, Nuclear Medicine and Imaging Ultrashort Echo Time (ute) Imaging Long‐t2 Suppression Short‐t2 Imaging Adiabatic Pulses |
| Content Type | Text |
| Resource Type | Article |
