Audit Title:  CT Colonography Practice

Descriptor: The sensitivity and specificity of CT Colonography (CTC)

Background:

International CT Colonography standards have been agreed and published.(Ref 1).Colonoscopy is currently the gold standard investigation for large bowel pathology. However, approximately 5% of colonoscopies are incomplete and there is a subset of patients who cannot tolerate endoscopic investigation. In these circumstances CTC can provide an alternative investigation. It has also been approved for screening applications. It is therefore essential to have in place mechanisms for ensuring that CTC is performed to an appropriate standard.

 

The cycle:

THE STANDARD

CTC should demonstrate a greater than 75% sensitivity and greater than 95% specificity for detecting polyps greater than 1cm in size [2,3]. Outside of the context of a clinical trial, and during routine normal working practice within a teaching hospital, a sensitivity of 89% and specificity of 94% has been reported for polyps larger than 5mm in size [4].

 

                              

National                                             Local

 

Target

>75% sensitivity and > 95% specificity for detecting polyps greater than 1cm in size [2,3].

 

 

 

LOCAL PRACTICE WAS ASSESSED AS FOLLOWS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


SUGGESTIONS FOR CHANGE IF TARGET NOT MET

 

 

 

 

 

 

 

 

 

 

 

The Resources Used …

THE DATA was collected by ...

     ˙  Computer records                           ˙  Review of requests                        ˙  Other (specify)

     ˙  Review of images                           ˙  Ongoing data recording

     ˙  Review of reports                           ˙  Questionnaire

 


ASSISTANCE

     ˙  None                                                 ˙  Data analysis                                  ˙  Other (specify)

      ˙  Secretarial                                        ˙  Software (off shelf)

     ˙  Audit office                                     ˙  Software (customised)

      ˙  Medical records                              ˙  Clinical professionals

 

TIME to help complete stages 1–3 of the first cycle

 

R A D I O L O G I S T                                                             R A D I O G R A P H E R                                             O T H E R ( s p e c i f y )

Approx _____ hrs per week                    Approx _____ hrs per week              Approx _____ hrs per week

for        _____ weeks                                 for        _____ weeks                          for        _____ weeks

= total   _____ hours                                = total  _____ hours                          = total  _____ hours

 

COSTS (stages 1–3 of the cycle) apart from radiologists’ / radiographers’ time

     ˙  None/minimal                                  ˙  Other (specify)                                Stages 1–3 of the first cycle

£

 
     ˙  Temporary staff

                ˙   Information technology

 


Results of the Completed Cycle…

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Comparison of findings …

(a) with the standard, shows that ...

 

 

 

 

(b) with the previous audit findings, shows that ...

 

 

 

 

 

 

(c) indicates that an improvement on the previous audit findings has occurred      ˙ Yes     ˙ No

 

A Further Audit will Occur

      in                                 months                                        to start (date) 

 

Useful References …

1. Burling D. on behalf of the International Collaboration for CT Colonography Standards. CT Colonography Standards. Clin Rad 2010;65:474-480
2.Pickhardt PJ, Choi JR, Hwang I et al. Computed tomographic virtual colonoscopy to screen for colorectal neoplasia in asymptomatic adults. N Engl J Med 2003;349:2191-2200
3.Macari M, Bini EJ, Xue X et al. Colorectal neoplasms: prospective comparison of thin section low dose multi detector row CT colonography and conventional colonoscopy for detection. Radiology 2002;224(2):383-392
4.Grant LA, Griffin N, Shaw AS. Two year audit of computed tomographic colonography in a teaching hospital: are we meeting the standard? Colorectal Dis 2009 Mar 5 [Epub ahead of print].
5.Taylor SA, Laghi A, Lefere P, Halligan S, Stoker J. European society of gastrointestinal and abdominal radiology (ESGAR): Consensus statement on CT Colonography. Eur Radiol 2007;17:575-579


The Audit was carried out by …

Stages 1–4                                                               Stages 5–6

 

Hospital

 


Address                                                                    Telephone No:

 

 

 

 


                                                                                Fax No:

 

 


A Copy of this form has been …

 

˙        placed in the Department’s Audit File

 

˙        sent to the Hospital’s Audit Office

 

˙        sent to the Clinical Audit Unit at the RCR

 

 

Appendix …

Further information (audit design / questionnaire / analysis of results / introduction of change)

is included as follows ...

 

 

 

 

 

 

 

 

 

© The Royal College of Radiologists 2013