Body Diffusion Weighted Imaging Using Non-CPMG Fast Spin Echo
| Autor: | Eric K. Gibbons, Shreyas S. Vasanawala, John M. Pauly, Adam B. Kerr, Patrick Le Roux |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Radiological and Ultrasound Technology Echo-Planar Imaging Echo (computing) Phase (waves) Signal-To-Noise Ratio Stability (probability) Article 030218 nuclear medicine & medical imaging Computer Science Applications 03 medical and health sciences 0302 clinical medicine Quality (physics) Nuclear magnetic resonance Diffusion Magnetic Resonance Imaging Signal-to-noise ratio (imaging) Distortion Effective diffusion coefficient Electrical and Electronic Engineering 030217 neurology & neurosurgery Software Diffusion MRI |
| Zdroj: | IEEE transactions on medical imaging. 36(2) |
| ISSN: | 1558-254X |
| Popis: | SS-FSE is a fast technique that does not suffer from off-resonance distortions to the degree that EPI does. Unlike EPI, SS-FSE is ill-suited to diffusion weighted imaging (DWI) due to the Carr-Purcell-Meiboom-Geill (CPMG) condition. Non-CPMG phase cycling does accommodate SS-FSE and DWI but places constraints on reconstruction, which are resolved here through parallel imaging. Additionally, improved echo stability can be achieved by using short duration and highly selective DIVERSE radiofrequency pulses. Here, signal-to-noise ratio (SNR) comparisons between EPI and nCPMG SS-FSE acquisitions and reconstruction techniques give similar values. Diffusion imaging with nCPMG SS-FSE gives similar SNR to an EPI acquisition, though apparent diffusion coefficient values are higher than seen with EPI. In vivo images have good image quality with little distortion. This method has the ability to capture distortion-free DWI images near areas of significant off-resonance as well as preserve adequate SNR. Parallel imaging and DIVERSE refocusing RF pulses allow shorter ETL compared to previous implementations and thus reduces phase encode direction blur and SAR accumulation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|