Background

Sir Geoffrey Hounsfield conceptualised dual energy CT (DECT) in the 1970's but it was not until 3rd generation scanners were developed that it became possible

Objective

This poster describes the principles of DECT, the rapid kVp swithing technique, the benefits, technical issues and considerations and the application of rapid kVp swithing to brain imaging

Methods

A brief overview of the principles of DECT will be presented and the technical benefits and issues outlined. Applications of kVp switiching technique in brain imaging will be shown.

Results

Improved tube technology will alleviate the dwell time mismatch (65%:35%) and allow for optimal tube current ratio. Additionally, the development and implementation of filters at the x-ray source and switching the filter potential between more than two voltages would further improve IQ and reduce dose.

Conclusions

In regards to brain imaging fast kVp switching has been proven to improve IQ due to the enhanced contrast resolution of the brains soft tissue; as well as increased sensitivity and specificity for detecting infarcts (for example) compared to single polychromatic beam.