Radiation dose metrics in multidetector computed tomography examinations: A multicentre retrospective study from seven tertiary care hospitals in Kerala, South India

Binoj Varghese; Indu Kandanga; Paul Puthussery; Dhanesh Vijayan; S P Harish Babu; M K Aneesh; Muhammad Noufal; E V Binu; Arun C Babu; Sheen M James; Siva Kumar

doi:10.4103/ijri.IJRI_394_17

Indian Journal of Radiology and Imaging, Table of Contents

CC BY-NC-ND 4.0 · Indian J Radiol Imaging 2018; 28(02): 250-257
DOI: 10.4103/ijri.IJRI_394_17

Miscellaneous

Radiation dose metrics in multidetector computed tomography examinations: A multicentre retrospective study from seven tertiary care hospitals in Kerala, South India

Binoj Varghese

Department of Radiodiagnosis, Amala Institute of Medical Sciences, Kerala, India

,

Indu Kandanga

Department of Radiodiagnosis, Amala Institute of Medical Sciences, Thrissur and University Hospital of North Durham, Durham, United Kingdom

,

Paul Puthussery

Department of Radiodiagnosis, Govt Medical College, Thrissur, Kerala, India

,

Dhanesh Vijayan

Department of Radiodiagnosis, Travancore Medical College Hospital, Kollam, Kerala, India

,

S P Harish Babu

Department of Radiodiagnosis, Baby Memorial Hospital, Kozhikode, Kerala, India

,

M K Aneesh

Department of Radiodiagnosis, Jubilee Mission Medical College and Research Institute, Thrissur, Kerala, India

,

Muhammad Noufal

Star Care Hospital, Kozhikode, Kerala, India

,

E V Binu

Department of Radiodiagnosis, Daya Hospital, Thrissur, Kerala, India

,

Arun C Babu

Department of Radiodiagnosis, Amala Institute of Medical Sciences, Kerala, India

,

Sheen M James

Department of Radiodiagnosis, Amala Institute of Medical Sciences, Kerala, India

,

Siva Kumar

Department of Radiodiagnosis, Amala Institute of Medical Sciences, Kerala, India

› Author Affiliations
Subject Editor:

Abstract

Background: Presently, computed tomography (CT) is the most important source of medical radiation exposure. CT radiation doses vary considerably across institutions depending on the protocol and make of equipment. India does not yet have national or region-specific CT diagnostic reference levels. Aim: To evaluate radiation doses of consecutive multidetector CT (MDCT) examinations based on anatomic region, performed in 1 month, collected simultaneously from seven tertiary care hospitals in Kerala. Settings and Design: Descriptive study. Materials and Methods: We collected the CT radiation dose data of examinations from the seven collaborating tertiary care hospitals in Kerala, performed with MDCT scanners of five different makes. The data included anatomic region, number of phases, CT dose index (CTDI_vol), dose-length product (DLP), and effective dose (ED) of each examinations and patient demographic data. Statistical Analysis: We calculated the 25^th, 50^th, and 75^th percentiles of the CTDI_vol, DLP, and ED according to anatomic region. We made descriptive comparisons of these results with corresponding data from other countries. Results: Of 3553 patients, head was the most frequently performed examination (60%), followed by abdomen (19%). For single-phase head examinations, 75^th percentile of CTDI_volwas 68.1 mGy, DLP 1120 mGy-cm, and ED 2.1 mSv. The 75^th percentiles of CTDI_vol, DLP, and ED for single-phase abdomen examinations were 10.6, 509.3, and 7.7, and multiphase examinations were 14.6, 2666.9, and 40.8; single-phase chest examinations were 23.4, 916.7, and 13.38, and multiphase examinations were 19.9, 1737.6, and 25.36; single-phase neck were 24.9, 733.6, and 3.814, and multiphase neck were 24.9, 2076, and 10.79, respectively. Conclusion: This summary CT radiation dose data of most frequently performed anatomical regions could provide a starting point for institutional analysis of CT radiation doses, which in turn leads to meaningful optimization of CT.

Keywords

Achievable dose - CT dose index - diagnostic reference level - diagnostic reference range - dose-length product - effective dose - radiation dose metrics

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References

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