Magritek presents the Paul Callaghan lectures on the principles of NMR and MRI. This series of 10 short videos explains how NMR and MRI works in a practical, hands-on fashion using the Terranova-MRI teaching system.
Video 01: Precession and Resonance
Video 02: Introduction to Nuclear Magnetic Resonance
Video 03: How the Terranova-MRI works
Video 04: Acquiring a Free Induction Decay (FID)
Video 05: Field Homogeneity
Video 06: Spin echoes, CPMG and T2 relaxation
Video 07: Measuring T1 and T2 Relaxation
Video 08: Magnetic Resonance Imaging
Video 09 part 1: Introduction to k-space
Video 09 part 2: k-space in multiple dimensions
Video 10: 2D MRI
Video 02: Introduction to Nuclear Magnetic Resonance Paul discusses the behavior of nuclear spin states in a magnetic field. The three key concepts covered are sample magnetization, Larmor precession frequency and the RF coil. Most of this presentation is in the form of slides.
Video 03: How the Terranova-MRI works This video provides an overview of how the Terranova-MRIinstrument works. This instrument is used in the video series to demonstrate the key principles. It uses the Earth’s magnetic field as the primary static field.
Video 04: Acquiring a Free Induction Decay (FID) Paul demonstrates the steps of acquiring a simple Free Induction Decay (FID) signal on a sample of water, and its representation as a spectrum in the frequency domain.
Video 05: Field Homogeneity Magnetic field homogeneity is important in NMR and MRI. In this video, Paul reviews the effects on the NMR signal of field inhomogeneity on both the Free Induction Decay and the spectrum, and how shimming can be used to improve field homogeneity and provide a narrow linewidth.
Video 06: Spin echoes, CPMG and T2 relaxation Paul delves into the spin echo, illustrating what is happening to the spins in this process and how the echo is created. The discussion then extends to the full CPMG pulse sequence and how this leads us to the important irreversible relaxation term, T2
Video 08: Magnetic Resonance Imaging Paul now moves to Magnetic Resonance Imaging (MRI) and carries out a very simple but informative 1D imaging experiment using a phantom sample containing two tubes of water.
Video 09 part 1: Introduction to k-space Paul introduces the viewer to the critical concept of k-space, clearly showing how spatial information in the physical sample is encoded using a field gradient and how this is represented in k-space. This video is given in a short lecture format.
Video 09 part 2: k-space in multiple dimensions Paul extends the discussion of k-space to two and three dimensions. The key concepts of traversing a two dimensional k-space are clearly presented, showing the pulse sequences used to move about in k-space and acquire the proper signal. The concepts presented in this video are the fundamental building blocks of any magnetic resonance imaging, including full body medical MRI. This video is given in a short lecture format.
Video 10: 2D MRI Paul uses the Terranova-MRI to perform two dimensional imaging experiments to practically demonstrate the k-space and imaging concepts presented in video 9 part 2. Both Cartesian imaging and Filtered Back Projection methods are shown.