NDLI: The impact of patient table on size-specific dose estimate (SSDE)

Content Provider	Springer Nature Link
Author	Anam, Choirul Haryanto, Freddy Widita, Rena Arif, Idam Dougherty, Geoff McLean, Donald
Copyright Year	2016
Abstract	The use of parameters water equivalent diameter (D $_{ W }$) and size-specific dose estimate (SSDE) are becoming increasingly established as a recognised method to relate patient dose from a CT examination to the dose indicator volume CT dose index (CTDI$_{VOL}$). However, the role of the attenuation due to the patient table in these estimations requires careful consideration and is the subject of this study. The aim of this study is to investigate the impact of a minimal part of the patient table when calculating the D $_{ W }$ and SSDE. We investigated 164 patients who had undergone CT examinations for the pelvis, abdomen, thorax and head. We subsequently calculated D $_{ W }$ and SSDE using two methods: one using a small circular region of interest (ROI) including a minimal part of the patient table and the other using a ROI fitted to the patient border alone. The results showed that the water equivalent diameter calculated with the table included in the ROI (D $_{ W,t }$) is greater, compared to that without the consideration of the patient table (D $_{ W,nt }$), by 1.5–6.2% depending on the anatomy being imaged. On the other hand, the SSDE calculated with inclusion of the patient table (SSDE$_{t}$) is smaller than otherwise (SSDE$_{nt}$) by 1.0–5.5% again depending on the anatomy being imaged. The effect of the patient table on D $_{ W }$ and SSDE in the thorax CT examination was statistically significant, but its effect on D $_{ W }$ and SSDE in the other examinations of head, pelvis and abdomen was relatively small and not statistically significant.
Starting Page	153
Ending Page	158
Page Count	6
File Format	PDF
ISSN	01589938
Journal	Australasian Physics & Engineering Sciences in Medicine
Volume Number	40
Issue Number	1
e-ISSN	18795447
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-11-10
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Water equivalent diameter (D $_{ W }$) Size-specific dose estimates (SSDE) Volume CT dose index (CTDI$_{VOL}$) Patient dose Patient table Biomedicine Biological and Medical Physics, Biophysics Medical and Radiation Physics Biomedical Engineering
Content Type	Text
Resource Type	Article
Subject	Radiology, Nuclear Medicine and Imaging Physics and Astronomy Biophysics Biomedical Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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