This paper presents a general overview of electromagnetic inductance tomography (EMT). A general introduction is given together with a description of the theoretical background of the technique. Three examples of different EMT systems are discussed and images produced using several different image reconstruction techniques are presented. A discussion of the main features of the techniques is included and some potential applications are suggested.

A new EMT sensor and instrumentation is described which combines the be4 features of previous systems and has a modular structure to allow for future system expansion and development. System Overview This paper describes a new electromagnetic tomography[ I] instrument which has been developed at UMIST and subsequently at Lancaster University. The new system attempts to combine the best features fiom two existing systems[2]: 1. The INESC Multi-pole EMT scanner which uses point source solenoid excitation. 2. The UMIST parallel field EMT system which uses a uniform parallel excitation field.

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