Assessment of effective dose in a series of CT of the knees, time to revise the guidelines?

C-0205

Assessment of effective dose in a series of CT of the knees, time to revise the guidelines?

J. M. E. Torsvik, I. Vik, A. P. Parkar; Bergen/NO
C-0205

Assessment of effective dose in a series of CT of the knees, time to revise the guidelines?

J. M. E. Torsvik, I. Vik, A. P. Parkar; Bergen/NO

Direct link to access the poster (click here)

 

Aims and objectives: The American College of Radiology (ACR) Appropriateness Criteria for knee trauma, knee pain and total knee arthroplasty do not recommend the use of CT, stating higher radiation dose compared to standard radiographs as the main objection1. However, the diagnostic superiority of CT over standard radio[…]

Methods and materials: All CT knee examinations in our PACS, performed between August 2014 and July 2015, were retrieved retrospectively. The dose-length-product (DLP) was recorded in each case, as was the age and gender. The ED was calculated using the conversion coefficient 0.0004 4. Effective dose (mSv) = DLP (mGyc[…]

Results: From August 2014 until July 2015 a total of 198 CTs of the knee were performed on 81 (41%) women and 117 (59%) men. The mean age of the patients were 32 years, median age 27 years, with a range between 15-85 years. The mean DLP was 85.4mGycm, median 83.7mGycm, with a range of between 59 to 124mG[…]

Conclusion: The average effective dose of CT knee was less than 50 % of the standard of a chest radiograph. Despite current ACR guidelines, CT of the knee may safely be used in routine clinical work, provided the correct technical parameters are used for imaging.

Personal information: Janne Marie Erdal Torsvik, Radiographer Haraldsplass Diakonale Sykehus, Bergen, Norway jnee@haraldsplass.no

References: 1. ACR guidelines finne ref https://acsearch.acr.org/docs/69419/Narrative/ (23.11.2015) https://acsearch.acr.org/docs/69430/Narrative/ (23.11.2015) https://acsearch.acr.org/docs/69432/Narrative/ (23.11.2015) 2. Mueffels, D.E., Potters, JW, Koning AH, Brown CH jr, Verhaar JA, Reiman M, : Visualizat[…]