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Radiation dose differences between thoracic radiotherapy planning CT and thoracic diagnostic CT scans

Sanderud, A, England, A, Hogg, P, Fosså, K, Svensson, S and Johansen, S 2016, 'Radiation dose differences between thoracic radiotherapy planning CT and thoracic diagnostic CT scans' , Radiography, 22 (2) , pp. 107-111.

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Abstract

Purpose: To compare the absorbed dose from computed tomography (CT) in radiotherapy planning (RP CT) against those from diagnostic CT (DG CT) examinations and to explore the possible reasons for any dose differences. Method: Two groups of patients underwent CT-scans of the thorax with either DG-CT (n=55) or RP-CT (n=55). Patients from each group had similar weight and body mass index (BMI) and were divided into low (<25) and high BMI (>25). Parameters including CTDIvol, DLP and scan length were compared. Results: The mean CTDIvol and DLP values from RP-CT (38.1 mGy, 1472 mGy·cm) are approximately four times higher than for DG-CT (9.63 mGy, 376.5 mGy·cm). For low BMI group, the CTDIvol in the RP-CT scans (36.4 mGy) is 6.3 times higher than the one in the DG-CT scans (5.8 mGy). For high BMI group, the CTDIvol in the RP-CT (39.6 mGy) is 2.5 times higher than the one in the DG-CT scans (15.8 mGy). In the DG-CT scans a strong negative linear correlation between noise index (NI) and mean CTDIvol was observed (r =-0.954, p=0.004); the higher NI, the lower CTDIvol. This was not the case in the RP-DG scans. Conclusion: The absorbed radiation dose is significantly higher and less BMI dependent for RP-CT scans compared to DG-CT. Image quality requirements of the examinations should be researched to ensure that radiation doses are not unnecessarily high.

Item Type: Article
Uncontrolled Keywords: Computed tomography, Radiotherapy planning, Thorax, Absorbed dose, CTDIvol, DLP
Themes: Health and Wellbeing
Schools: Schools > School of Health Sciences > Centre for Health Sciences Research
Journal or Publication Title: Radiography
Publisher: Elsevier
Refereed: Yes
ISSN: 1078-8174
Related URLs:
Funders: Non funded research
Depositing User: P Hogg
Date Deposited: 01 Oct 2015 10:39
Last Modified: 18 Sep 2016 01:38
URI: http://usir.salford.ac.uk/id/eprint/36745

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