The new CT technology: what are the benefits?

6/12/02


Click here to start


Table of Contents

The new CT technology: what are the benefits?

The new CT technology

What is the “new technology”?

What is the “new technology”?

How does the patient benefit?

How does the patient benefit?

Axial image quality

Multi-slice scanning

Advantages over single slice

Shorter time ? fewer motion artefacts

Thinner slices ? better z-axis resolution

Thinner slices ? better 3D images

Longer volumes?? more useful scans

What evidence is there of improvements?

Advantages for CT angiography

Advantages for CT angiography

Vessel analysis

Artefacts in multi-slice scanning

Photon starvation artefacts

Methods of image reconstruction

Multi-dimensional adaptive filtering (MAF)

Effects of 3D filtration

Noise reduction using 3D filtration

Artefacts in multi-slice scanning

The cone beam problem

Cone beam artefact

Cone beam effect

Solving the cone beam problem

Effects of using cone beam algorithm

How does the patient benefit?

Improved patient comfort and compliance

Reduced risk of complications

CT Perfusion

Sparing invasive procedures

Cardiac CT with earlier technology

Cardiac CT now

Prospective ECG gating

Retrospective ECG gating

Retrospective ECG gating

Cardiac calcification scoring

CT coronary angiography

Phase-selective reconstruction

How does the patient benefit?

Multi-slice v. single-slice doses

How might doses be higher with multi-slice?

Thin slices: contribution of penumbra

Geometric efficiencies

How might doses be lower?

Dose reduction features

Matching tube current to attenuation

Tube current modulation

ECG-gated mA modulation

Paediatric protocols

Conclusions

Author: Julia Barrett

Email: julia@impactscan.org

Home Page: http://www.impactscan.org