Radiation safety concerns and diagnostic reference levels for computed tomography scanners in Tamil Nadu

Livingstone, Roshan S; Dinakaran, Paul M.

doi:10.4103/0971-6203.75471

Cited by 9 publications

(9 citation statements)

References 18 publications

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“…Also, the third quartile value of CTDI v for abdomen scan is less than the one reported for Tamil Nadu (521 mGy). [ 14 ]…”

Section: Resultsmentioning

confidence: 99%

“…An attempt has been made in the year 2008 to determine the third quartile value for CTDI v for the CT scanners in Tamil Nadu and the values were reported as 557 and 551 mGy for thorax and abdomen procedures, respectively. [ 14 ] Since then no studies have been carried out in this line in India. The aim of the present study is to establish DRL for CTDI v and DLP for the CT scanners operating in Pudhuchery region.…”

Section: Introductionmentioning

confidence: 99%

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Establishment of diagnostic reference levels in computed tomography for select procedures in Pudhuchery, India

Saravanakumar¹,

Vaideki²,

Govindarajan³

et al. 2014

J Med Phys

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Computed tomography (CT) scanner under operating conditions has become a major source of human exposure to diagnostic X-rays. In this context, weighed CT dose index (CTDIw), volumetric CT dose index (CTDIv), and dose length product (DLP) are important parameter to assess procedures in CT imaging as surrogate dose quantities for patient dose optimization. The current work aims to estimate the existing dose level of CT scanner for head, chest, and abdomen procedures in Pudhuchery in south India and establish dose reference level (DRL) for the region. The study was carried out for six CT scanners in six different radiology departments using 100 mm long pencil ionization chamber and polymethylmethacrylate (PMMA) phantom. From each CT scanner, data pertaining to patient and machine details were collected for 50 head, 50 chest, and 50 abdomen procedures performed over a period of 1 year. The experimental work was carried out using the machine operating parameters used during the procedures. Initially, dose received in the phantom at the center and periphery was measured by five point method. Using these values CTDIw, CTDIv, and DLP were calculated. The DRL is established based on the third quartile value of CTDIv and DLP which is 32 mGy and 925 mGy.cm for head, 12 mGy and 456 mGy.cm for chest, and 16 mGy and 482 mGy.cm for abdomen procedures. These values are well below European Commission Dose Reference Level (EC DRL) and comparable with the third quartile value reported for Tamil Nadu region in India. The present study is the first of its kind to determine the DRL for scanners operating in the Pudhuchery region. Similar studies in other regions of India are necessary in order to establish a National Dose Reference Level.

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“…Also, the third quartile value of CTDI v for abdomen scan is less than the one reported for Tamil Nadu (521 mGy). [ 14 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Establishment of diagnostic reference levels in computed tomography for select procedures in Pudhuchery, India

Saravanakumar¹,

Vaideki²,

Govindarajan³

et al. 2014

J Med Phys

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show abstract

“…There were many countries in Western and Asian regions that have established and reported their national DRLs for adult CT studies: for example Australia, Northern Greece, Turkey, the United Kingdom (UK), other European countries, US, Iran, Malaysia, Japan, and India. [15][16][17][18][19][20][21][22][23][24][25] A study in Thailand in 2012 found CT radiation dose of head below international DRLs but those of CT chest and abdomen exceeded the international DRLs. 26 A 2011's study at five Thai university hospitals, including Songklanagarind Hospital, noted DRLs of adult brain, chest and abdominal CT varied widely but were within acceptable levels compared to international DRLs.…”

Section: Introductionmentioning

confidence: 99%

Radiation Dose from Computed Tomography Scanning in Patients at Songklanagarind Hospital: Diagnostic Reference Levels

Pema

Kritsaneepaiboon

2020

J Health Sci Med Res

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Objective: To determine diagnostic reference levels (DRLs) of computed tomography (CT) radiation doses in terms of CT dose index volume (CTDIvol) and dose length product (DLP) of CT scans of the head, chest and abdomen for patients at Songklanagarind Hospital, Thailand. Material and Methods: This was a retrospective analysis of 463 randomly selected head, chest and abdominal CT stuides from 416 patients enrolled from July 1st to 31st 2017. The CTDIvol, DLP and clinical indication for each CT study were conducted. The median and third quartile values were analysed and compared to the standard international DRLs. The DRL was defined as the third quartile value. Results: The DRLs for CTDIvol, and DLP of head, chest and whole abdominal CT were 57.5, 11.6 and 13.1 milliGray (mGy), and 1,102.6, 474.7 and 624.4 milliGray x centimetre (mGy.cm), respectively. The most common clinical indications were stroke (29.1%) for head CT and malignancy for both chest (73.6%) and abdominal CTs (49.6%). Conclusion: The DRLs of each CT region were mostly below standard international DRLs of Australia, Europe, Japan, the United Kingdom and the United States. The clinical indication for malignancy had significant difference in the DLP values than other clinical indications in head and chest CT.

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“…Even though there is enough recently published regional CT radiation dose data from south India,[ 15 16 17 18 ] any such data have not considered the make of CT equipment (number of slices of CT) and actual number of phases in contrast CT examinations. These factors are important with regard to actual dose delivered to the patient.…”

Section: Introductionmentioning

confidence: 99%

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

Varghese

Kandanga

Puthussery

et al. 2018

Indian Journal of Radiology and Imaging

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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 CTDIvol was 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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Radiation safety concerns and diagnostic reference levels for computed tomography scanners in Tamil Nadu

Cited by 9 publications

References 18 publications

Establishment of diagnostic reference levels in computed tomography for select procedures in Pudhuchery, India

Establishment of diagnostic reference levels in computed tomography for select procedures in Pudhuchery, India

Radiation Dose from Computed Tomography Scanning in Patients at Songklanagarind Hospital: Diagnostic Reference Levels

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

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