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Pulsed magnetization transfer versus continuous wave irradiation for tissue contrast enhancement
E Schneider1, R W Prost, G H Glover
1Applied Science Laboratory, GE Medical Systems, Waukesha, WI 53188.
Journal of Magnetic Resonance Imaging : JMRI
|March 1, 1993
Summary
Binomial radio-frequency (RF) pulses offer a power-efficient method for saturation transfer compared to pulsed or continuous wave techniques. These pulses are easily implemented and selectively excite short T2 species.
Area of Science:
- Magnetic Resonance Imaging
- Biophysical Techniques
Background:
- Magnetization transfer techniques are crucial in Magnetic Resonance Imaging (MRI) for characterizing tissue properties.
- Pulsed and continuous wave (CW) irradiation methods have been traditionally used for saturation transfer, each with specific power requirements and efficiencies.
Purpose of the Study:
- To compare the saturation efficiency and radio-frequency (RF) power requirements of pulsed and continuous wave (CW) irradiation techniques for magnetization transfer.
- To evaluate binomial RF pulses as an alternative method for saturation transfer.
Main Methods:
- Analysis of pulsed magnetization transfer and continuous wave (CW) irradiation techniques.
- Comparison of saturation efficiency and RF power demands at 1.5 T and 0.5 T.
- Implementation and assessment of binomial RF pulses for saturation transfer.
Main Results:
- Binomial RF pulses demonstrate higher power efficiency for exciting saturation transfer compared to pulsed and CW methods.
- Binomial pulses are readily integrated into various pulse sequences.
- Selective excitation of short T2 species is achieved with binomial pulses, while long T2 species are affected as if by 0-degree pulses.
Conclusions:
- Binomial RF pulses represent a more power-efficient and versatile approach for saturation transfer in MRI.
- The findings suggest potential for improved imaging techniques utilizing binomial RF pulse sequences.