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Integration of digital signal processing technologies with pulsed electron paramagnetic resonance imaging
Randall H Pursley1, Ghadi Salem, Nallathamby Devasahayam
1Signal Processing and Instrumentation Section, Division of Computational Biosciences, Center for Information Technology, National Institutes of Health, 12 South Drive, Bldg. 12A-2025, Bethesda, MD 20892-1002, USA. pursley@nih.gov
Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|October 26, 2005
Summary
This study integrates digital signal processing (DSP) with radiofrequency Fourier transform electron paramagnetic resonance (FT-EPR) imaging. This advancement enables real-time, adaptable in vivo EPR imaging with improved performance and reduced noise.
Area of Science:
- Biophysics
- Medical Imaging
- Spectroscopy
Background:
- Traditional Electron Paramagnetic Resonance (EPR) imaging faces limitations in real-time data acquisition and processing.
- Existing systems often involve complex analog components, introducing noise and limiting adaptability.
Purpose of the Study:
- To integrate modern digital signal processing (DSP) technologies with radiofrequency (RF) Fourier transform electron paramagnetic resonance (FT-EPR) imaging.
- To develop a more adaptable and higher-performing FT-EPR system for in vivo studies.
Main Methods:
- Implementation of direct free induction decay time-locked subsampling (TLSS) at a Larmor frequency of 300MHz.
- Utilization of a high-speed field-programmable gate array (FPGA) and a DSP processor for real-time signal and image processing.
- Development of application-specific hardware, software, and firmware for the DSP-based system.
Main Results:
- Successful integration of DSP technologies into an RF FT-EPR imaging system.
- Demonstration of real-time signal and image processing capabilities.
- Elimination of the analog intermediate frequency downconversion stage, reducing noise.
Conclusions:
- The DSP-based FT-EPR system offers improved performance and adaptability for in vivo studies.
- Direct detection bandpass sampling with real-time DSP enables effective RF EPR imaging.
- This approach paves the way for more versatile and efficient EPR imaging platforms.