:: welcome...

What is a CT scanner ?

A CT (or CAT) scanner produces x-ray images of 'slices' through the body.

See our patient's guide for more information.

ImPACT: Imaging Performance Assessment of CT Scanners

Welcome to the web site of the ImPACT group.

We are the UK's CT scanner evaluation centre. We provide a wide range of CT scanner related services to the National Health Service and other providers of healthcare in the UK. On our site, we try to give you an idea of our work, as well as providing resources for people involved in CT scanning.

:: finding your way around this site

Please follow the links in the navigation pane on the right hand side of each page to get to the area in which you are interested.

Some of the most current topics and recent additions are listed below.

If you are not sure what you are looking for, please search our site : 
Due to our current status and the long delay in responding to your contact messages, it will be quicker for you if you can find the answer on the site

:: ImPACT news

:: NHS PASA CEP

April 2010

ImPACT's funding body, the NHS PASA Centre for Evidence-based Purchasing, was decommissioned on 31st March 2010. Evaluation reports and related publications produced by CEP and its predecessors can now be found on the new Department of Health CEP web page.

Work in providing impartial assessments on diagnostic medical devices is now the responsibility of the National Institute for Health and Clinical Excellence (NICE) as part of the their Diagnostic Assessments Programme.

:: new publications

April 2010

The ImPACT market review of advanced CT scanners for coronary angiography was published in March 2010. The report can be downloaded from the CEP website, linked from our reports page.

The ImPACT evidence review on the Dyna-Vision mobile real-time remote patient monitor was published in March 2010. The report can be downloaded from the CEP website, linked from our reports page.

:: CTDosimetry version 1.0.3 available

November 2009

A new version of CTDosimetry is now available to download. Version 1.0 added the ability to calculate effective doses according to ICRP 103, added data for several more scanners as well as a number of other smaller changes. Version 1.0.2 had some minor bug fixes and was released in November 2009.

Version 1.0.3, released in August 2010, adds information on the Philips Brilliance 40 and 64 scanners and corrects some minor errors elsewhere in the spreadsheet.

The latest version of the spreadsheet is available for download on the CTDosimetry page.

ImPACT are changing the model for incorporation of new data into the spreadsheet. Rather than relying on our evaluations for data we are working with the Institute of Physics and Engineering in Medicine's Diagnostic Radiology Special Interest Group (IPEM's DR SIG) to update the data. Read how you can contribute data on the CTDosimetry page.

:: team news

September 2009

Jim Weston has now left ImPACT and is working in the Medical Physics Department at Guy's and St Thomas' NHS Trust. We wish him well in his new post.

Jonathan Turner has joined us from our neighbour evaluation group at St George's, PACSnet.

:: site status

broken links to reports - an update

We are aware that there were problems with the links from our site to the published reports. This was due to changes on the PASA web site. We have now updated our links and they should work. However, there may still be issues arising as responsibility for maintaining CEP reports passes from NHS PASA to the Department of Health. You can now go to our report list and select the report you want to download.

Apologies for any inconvenience that this may have caused you.

website issues

There are no known issues with the web site at present. Please let us know if you find problems with the site.

:: latest topics