Imagistica prin rezonanta magnetica P5942400
Principle
The basic principles of 2D MR imaging are demonstrated with two methods relying on two different gradient techniques. Experiments are executed with a MRT training device giving the opportunity to investigate some small probes in the sample chamber. Device control is done with the provided software. Investigations comprise the generation of a two-dimensional cross-section image via the spin echo technique, i.e. a spin echo signal is investigated while simultaneously superimposed with a magnetic field gradient, and the generation of a two-dimensional cross-section image via the gradient echo technique, i.e. a particular gradient echo signal is investigated. The latter technique is closely linked to the FLASH (Fast Low Angle Shot) which is an ultrafast technique in MR imaging.
Tasks
- Using the frequency and phase gradient techniques to generate a spin echo signal which can be used for 2D image reconstruction (Spin Echo 2D).
- Using the frequency and phase gradient techniques to generate a gradient echo signal which can be used for 2D image reconstruction (Flash 2D).
What you can learn about
- Nuclear spins
- Precession of nuclear spins
- Resonance condition, MR frequency
- MR flip angle
- FID signal (Free Induction Decay)
- Magnetic gradient fields
- Spatial encoding (frequency coding, phase coding)
- Spin echo, gradient echo
- Fast-Fourier-Transformation (FFT)
- T1/T2 relaxation times
- De-/Rephasing
