Computed tomography dose in paediatric care: Simple dose estimation using dose length product conversion coefficients

Nor Hanani Mohd Tap, Mohamed Ariff Jaafar Sidek, Siti Farizwana Mohd Ridzwan, S. Elavarasi Selvarajah, Faizah Mohd Zaki, Hamzaini Abdul Hamid

Research output: Contribution to journalArticle

Abstract

Background: The use of multislice computed tomography (MSCT) is increasing worldwide; at the same time, there is a growing awareness of the future risk of cancer associated with greater exposure to radiation. Therefore, there is a need for an accessible method of effective dose estimation. This study aims to estimate the effective doses (EDs) of a variety of paediatric computed tomography (CT) examinations in five age groups using recently published age- and region-specific dose length products (DLPs) as effective dose conversion coefficients. Methods: A retrospective review was performed over a 12-month period. Patients were assigned to one of five age groups: neonatal, 1-, 5-, 10- and 15-years-old. Age- and region-specific conversion coefficients were applied to the DLP data displayed on the CT console in order to estimate the ED. Results: Over the 12-month period, there were a total of 283 CT scans, 211 of which were selected for study. The ED estimates for plain CT brain scans in neonatal, 1-, 5-, 10- and 15-yearolds were 2.5, 1.5, 1.4, 1.3 and 0.8 mSv, respectively. For the corresponding CT abdominal scans, the results were 18.8, 12.9, 7.8, 8.6 and 7.5 mSv; these were the highest values recorded. Highresolution CT (HRCT) temporal scans showed EDs of 2.9, 1.8, 1.5 and 1.1 mSv in 1-, 5-, 10- and 15-years-old, respectively. CT scans of the helical thorax had an estimated ED of 4.8, 4.2 and 7.0 mSv in 5-, 10- and 15-years-old, respectively. Conclusion: An inverse relationship between age and effective dose was demonstrated in CT scans of the brain and abdomen/pelvis. In general, our study showed lower overall EDs compared to other centres.

Original languageEnglish
Pages (from-to)82-91
Number of pages10
JournalMalaysian Journal of Medical Sciences
Volume25
Issue number4
DOIs
Publication statusPublished - 1 Aug 2018

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Tomography
Pediatrics
Age Groups
Multidetector Computed Tomography
Spiral Computed Tomography
Brain
Pelvis
Abdomen
Thorax
Neoplasms

Keywords

  • Conversion coefficient
  • Dose length product
  • Effective dose
  • Paediatric CT
  • Simple dose estimation

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Computed tomography dose in paediatric care : Simple dose estimation using dose length product conversion coefficients. / Mohd Tap, Nor Hanani; Jaafar Sidek, Mohamed Ariff; Mohd Ridzwan, Siti Farizwana; Selvarajah, S. Elavarasi; Mohd Zaki, Faizah; Abdul Hamid, Hamzaini.

In: Malaysian Journal of Medical Sciences, Vol. 25, No. 4, 01.08.2018, p. 82-91.

Research output: Contribution to journalArticle

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AU - Selvarajah, S. Elavarasi

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