Magnetic Resonance Imaging (MRI) I

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. 

Benefits

• Complete, easy to install and affordable MRT education system
• One system to cover all aspects from NMR basics to sophisticated 2D and 3D imaging sequences
• Detailed experiment guides included with the system
• Learning results guaranteed thanks to easy to manage course steps
• Can be set up at any location in the student lab
• Experience the realistic sound of the different MR sequences

Tasks

1. Using the frequency and phase gradient techniques to generate a spin echo signal which can be used for 2D image reconstruction (Spin Echo 2D).
2. Using the frequency and phase gradient techniques to generate a gradient echo signal which can be used for 2D image reconstruction (Flash 2D).

Learning objectives

• 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