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MISCELLANEOUS Table of Contents   
Year : 2018  |  Volume : 28  |  Issue : 2  |  Page : 250-257
Radiation dose metrics in multidetector computed tomography examinations: A multicentre retrospective study from seven tertiary care hospitals in Kerala, South India

1 Department of Radiodiagnosis, Amala Institute of Medical Sciences, Thrissur, Kerala, India
2 Department of Radiodiagnosis, Amala Institute of Medical Sciences, Thrissur and University Hospital of North Durham, Durham, United Kingdom
3 Department of Radiodiagnosis, Govt Medical College, Thrissur, Kerala, India
4 Department of Radiodiagnosis, Travancore Medical College Hospital, Kollam, Kerala, India
5 Department of Radiodiagnosis, Baby Memorial Hospital, Kozhikode, Kerala, India
6 Department of Radiodiagnosis, Jubilee Mission Medical College and Research Institute, Thrissur, Kerala, India
7 Star Care Hospital, Kozhikode, Kerala, India
8 Department of Radiodiagnosis, Daya Hospital, Thrissur, Kerala, India

Correspondence Address:
Binoj Varghese
Department of Radiodiagnosis, Amala Institute of Medical Sciences, Thrissur - 680 055, Kerala
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ijri.IJRI_394_17

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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 (CTDIvol), dose-length product (DLP), and effective dose (ED) of each examinations and patient demographic data. Statistical Analysis: We calculated the 25th, 50th, and 75th percentiles of the CTDIvol, 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, 75th percentile of CTDIvolwas 68.1 mGy, DLP 1120 mGy-cm, and ED 2.1 mSv. The 75th percentiles of CTDIvol, 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.

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