Generalized optimal current patterns and electrical safety in EIT

Generalized optimal current patterns and electrical safety in EIT.

There are a number of constraints which limit the current and voltages which can be applied on a multiple drive electrical imaging system. One obvious constraint is to limit the maximum ohmic power dissipated in the body. Current patterns optimizing distinguishability with respect to this constraint are singular functions of the difference of transconductance matrices with respect to the power ...

Electrode positions and current patterns for 3D EIT

For a 3D electrical impedance tomography (EIT) system, it is necessary to improve electrode geometries placed around a body surface, and correspondingly apply stimulation and measurement patterns to produce maximum distinguishability. Advanced EIT image reconstruction requires designing systems with the electrode geometry and current injection such that the full ensemble of measurements provide...

Breast Imaging using Electrical Impedance Tomography (EIT)

An Current Source Using a Negative Impedance Converter (nic) for Electrical Impedance Tomography (eit)

The purpose of this paper is to improve the output impedance of a current source used for Electrical Impedance Tomography (EIT) by using a Negative Impedance Converter (NIC). A Monopolar Howland Current Source(MHCS) and NIC circuits were implemented and then the output impedance was measured by a Data Acquisition (DAC) board of 12 bits resolution. A resistive load was used for investigating the...

patterns and variations in native and non-native interlanguage pragmatic rating: effects of rater training, intercultural proficiency, and self-assessment

although there are studies on pragmatic assessment, to date, literature has been almost silent about native and non-native english raters’ criteria for the assessment of efl learners’ pragmatic performance. focusing on this topic, this study pursued four purposes. the first one was to find criteria for rating the speech acts of apology and refusal in l2 by native and non-native english teachers...