:: ukrc 2005

The 2005 UK Radiological Congress (UKRC) was held at Manchester G-MEX from 6-8th June 2005. ImPACT presented a paper on developments in spiral and multi-slice CT, the abstract for the talk is below. The slides from the presentation can be seen on line.

Spiral and multi-slice CT: physics and dosimetry (view slides)

Nicholas Keat

Multi-slice scanners have had a significant impact upon CT scanning since they were introduced in 1998. This talk aims to discuss some of the main areas where they have brought about change, in terms of their design, benefits, radiation dose and image quality.

The basic differences in design between single and multi-slice scanners will be outlined, as well as the additional improvements required for modern 32 to 64 slice systems. Methods for scan reconstruction will be demonstrated in general, non technical terms.

The main clinical benefits of multi-slice scanners relate to their ability to scan faster, longer or with better z-axis resolution than a single slice system. In practice, more than one of these benefits will often be useful, with the particular requirements depending upon the clinical protocol.

Radiation dose from CT is relatively high compared to other diagnostic x-ray techniques, and dose from multi-slice CT will be discussed. Automatic Exposure Control (AEC) systems for CT are now available, and these systems' operation and effect upon dose and image quality will be covered. CT scanner image quality will be discussed, paying particular attention to the artefacts introduced when using multi-slice systems.