A contribution to the establishment of diagnostic reference levels in CT

Hatziioannou, Konstantinos; Papanastassiou, Emmanouil; Delichas, Miltiadis G.; Bousbouras, Periklis

doi:10.1259/bjr/60897046

Cited by 37 publications

(21 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[12] The dose parameters recommended in the guidelines are weighed CT dose index (CTDI w ) and volumetric CT dose index (CTDI v ) for a single section and dose length product (DLP) for the entire examination. [13] The purpose of our study is to establish nationwide “Diagnostic Reference Level" for CT scanners for select procedures viz., head, chest, and abdomen. The first step towards setting a national DRL is to arrive at regional DRL for which the entire nation has been divided into five zones namely south, north, east, west, and center.…”

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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…Hatziioannou et al 21 large number of single slice axial and helical scanners in Greece in an attempt to verify the usefulness of the proposed EU diagnostic reference levels (DRLs) 11,13 . Given the types of scanners involved in their survey, and major differences in the clinical protocols utilized, direct comparison with the present multi-slice work is hardly valid.…”

Section: Discussionmentioning

confidence: 99%

Patient doses in multi-slice CT and the importance of optimisation

Heggie

2005

Australas. Phys. Eng. Sci. Med.

View full text Add to dashboard Cite

Substantive surveys of patient doses arising from CT examinations have been conducted in our Hospital. In the first instance doses were measured on a single-slice Siemens Plus 4 scanner. A similar survey was conducted initially following commissioning of a Siemens multi-slice Sensation scanner and subsequently after some effort was made to optimise scanning protocols. Doses are reported in terms of dose-length products (DLPs) and as effective doses. The optimisation process on the multi-slice scanner resulted in a reduction in DLP values by between 14% and 58%. With two exceptions, significantly lower or comparable DLP values were obtained when meaningful comparisons were made with results previously obtained with the single-slice scanner. Specific results for the multi-slice scanner in terms of the median DLP in mGy.cm (and median effective dose in mSv) are: routine brain, 660 (1.5); routine chest, 195 (4.0); chest with portal liver phase, 370 (7.2); routine chest with high resolution component, 250 (5.1); chest/abdomen/pelvis with contrast, 560 (11.0); routine abdomen without contrast, 145 (2.4); routine abdomen with contrast 215 (3.6); routine abdomen/pelvis without contrast, 230 (4.4); routine abdomen/pelvis with contrast, 345 (6.3); abdomen/pelvis triple phase, 715 (13.3); renal scan, 260 (4.6); lumbar spine, 445 (7.2); cerebral angiography, 240 (0.58); pulmonary angiography, 165 (3.4); aortic angiography, 305 (5.7). Based on the survey findings possible values for CT examination local diagnostic reference levels (LDRLs) are suggested.

show abstract

“…These examinations were specifically selected as this is the first stage of a larger study aimed at optimisation for CT trunk examinations in Saudi Arabia. Furthermore, a recent study demonstrated that CT scans in the trunk region can result in higher effective doses, reaching up to a maximal value of 15 mSv (18) . Survey booklets were designed and piloted randomly in four hospitals to check for appropriateness; these centres were not included in the main survey.…”

Section: Methodsmentioning

confidence: 99%