Experiment - Basic principles of nuclear magnetic resonance

Principles and objectives:

The fundamental principles of the phenomenon of nuclear magnetic resonance (NMR) are explored.

The experiments are carried out using a didactic MRT device allowing the study of small samples.

The operation is done using the provided software. The investigations include adjusting the system frequency to the Larmor frequency, determining the tilting angle of the magnetization vector (nutation angle), the influence of the substance quantity and specific magnetic field inhomogeneities, measuring a spin echo signal, and a signal averaging procedure to optimize the signal-to-noise ratio. Adjusting all these parameters is essential to obtain a usable MR image.

1- Adjusting the system frequency to the Larmor frequency.

2- Adjusting the duration of the RF (Radio Frequency) pulse to determine the tilting angle of the magnetization vector (nutation angle).

3- Influence of the quantity of substances on the amplitude of the free induction decay (FID) signal.

4- Correcting superimposed magnetic field inhomogeneity defects (shimming).

5- Recovering a relaxed free induction decay (FID) signal by spin echo with a 180°C rephasing pulse.

6- Optimizing the signal-to-noise ratio of the free induction decay (FID) signal.

Lab - Basic principles of nuclear magnetic resonance (Ref. 705765)

Composition:
Magnetic Resonance Imaging (MRI) machine with software and teaching materials.