This NMR machine was especially build for demo purposes. However it is also used to help students to learn the basic principles of NMR imaging. Using this machine one can image a finger, therefor the name 'finger' NMR. This machine uses a 'portable' permanent magnet of 60 kg. This has a field of 0.3 T and a homogeneity of 10E-5 for 1 DSV, which is 'just' enough for imaging purposes.
   

The 0.3 T permanent magnet with the insert for the imaging of a finger

Using a home built gradient driver linear gradients in 2 and 3D can be made up to 3000 Hz/mm with a rise time in the order of 0.5 ms. For the NMR a home-built receiver/transmitter is used. All data-acquisition is done using the PhyDAS system which is operated under real time operating system Vx-Works.

An overview of the electronics of the finger NMR

This system is communicating with a PC system which is used for interfacing with the NMR and visualization of the data.

The NMR is operated using a PC which uses Lab-Windows.
 
 

An example of a finger. The bone with bonemarrow can clearly be recognized

An image of a piece of candy bar. The soft filling can clearly be seen.


Jef Noijen                 : NMR receiver/transmitter
Jaap Feijen               : Permanent magnet/ gradient driver/NMR insert
Joris van der Sande  : NMR software
Ginny ter Plegt         : Permanent magnet
Workshop                 : Mechanical components