Changes in CT radiation doses in Australia from 1994 to 2002

Wise, KN; Thomson, J. E. M.

doi:10.1002/j.2051-3909.2004.tb00006.x

Cited by 15 publications

(22 citation statements)

References 3 publications

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“…In Australia in 1996, CT imaging was the largest source of radiation exposure from diagnostic radiology procedures, accounting for about 50% of the total dose 1 . The annual per capita dose from CT examinations was approximately 0.39 millisieverts (mSv) compared with 0.83 mSv from all medical diagnostic exposures 1,2 . CT imaging contributed approximately 17% of the average total annual dose of 2.3 mSv from all natural and man‐made radiation sources.…”

Section: Introductionmentioning

confidence: 99%

Paediatric CT imaging trends in Australia

2011

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Section: Introductionmentioning

confidence: 99%

Paediatric CT imaging trends in Australia

2011

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“…Compared with head and neck CT, the absorbed dose to the lens of the eye is lower in SCT. Table 4 shows the effective dose in SCT and the effective doses for neck CT and VF reported in numerous publications [1,[11][12][13][14][15][16][17][18]. The effective dose in SCT is 3.9 mSv, which is 1.0 mSv higher than that in typical neck CT and 3.5 mSv higher than that in VF.…”

Section: Evaluation Of Spatial Dose Distributionmentioning

confidence: 99%

Evaluation of patient dose and operator dose in swallowing CT studies performed with a 320-detector-row multislice CT scanner

Kobayashi

Koshida

Suzuki

et al. 2012

Radiol Phys Technol

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Recently, attempts to develop new types of swallowing function analysis with 320-detector-row multislice CT (320-MDCT) have been reported. The present report addresses (1) patient exposure, (2) operator exposure, and (3) spatial dose distribution.For dose measurement, a human-body phantom in which 303 thermoluminescent dosimeter elements were inserted and a survey meter was used. The patient position was confirmed with a single-volume scan at a tube voltage of 120 kV, a tube current of 10 mA, a rotation speed of 0.35 s/rot., a slice thickness of 0.5 mm, coverage of 160 mm, a scan field of view of 240 mm, a small focal spot size, and a gantry tilt angle of 22 (volume CT dose index;CTDI vol displayed on the console: 0.8 mGy, dose-length product;DLP: 12.1 mGycm). The effective dose for the patient in swallowing CT was 3.9 mSv. The conversion factor for obtaining the effective dose was 0.0066 mSv/mGycm. The effective dose for the operator was 0.002 mSv. In the operator exposure measurement, the ambient dose equivalent H*(10), that would be produced by an expanded and aligned radiation field at a depth 10 mm in the International Commission on Radiation Units and Measurements (ICRU) sphere, was 0.012 mSv. In this report, the safety of swallowing CT, which has become possible with the introduction of 320-MDCT, was evaluated by measurement of the exposure to the

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“…Substantial increases in computed tomography (CT) usage and population dose have been reported in the USA, UK, Europe, and Australia over the past two decades [1][2][3][4][5] resulting in governments, radiation regulatory bodies, and radiology associations and professionals highlighting the need for optimized CT protocols [6][7][8]. Establishing such protocols often involves the use of phantoms due to the difficulty of employing patients when comparing different technical or procedural factors involving ionizing radiation [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Computed Tomography Protocols: Limitations of a Methodology Employing a Phantom with Location-Known Opacities

et al. 2013

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This study aimed to determine if phantom-based methodologies for optimization of hepatic lesion detection with computed tomography (CT) require randomization of lesion placement and inclusion of normal images. A phantom containing fixed opacities of varying size (diameters, 2.4, 4.8, and 9.5 mm) was scanned at various exposure and slice thickness settings. Two image sets were compared: All images in the first image set contained opacities with known location; the second image set contained images with opacities in random locations. Following Institutional Review Board approval, nine experienced observers scored opacity visualization using a 4-point confidence scale. Comparisons between image sets were performed using Spearman, Kappa, and Wilcoxon techniques. Observer scores demonstrated strong correlation between both approaches when all opacity sizes were combined (r=0.92, p<0.0001), for the 9.5 mm opacity (r=0.96, p<0.0001) and for the 2.4 mm opacity (r=0.64, p<0.05). There was no significant correlation for the 4.8 mm opacity. A significantly higher sensitivity score for the known compared with the unknown location was found for the 9.5 mm opacity and 4.8 mm opacity for a single slice thickness and exposure condition (p<0.05). Phantom-based optimization of CT hepatic examinations requires randomized lesion location when investigating challenging conditions; however, a standard phantom with fixed lesion location is suitable for the optimization of routine liver protocols. The development of more sophisticated phantoms or methods than those currently available is indicated for the optimization of CT protocols for diagnostic tasks involving the detection of subtle change.

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Changes in CT radiation doses in Australia from 1994 to 2002

Cited by 15 publications

References 3 publications

Paediatric CT imaging trends in Australia

Paediatric CT imaging trends in Australia

Evaluation of patient dose and operator dose in swallowing CT studies performed with a 320-detector-row multislice CT scanner

Optimization of Computed Tomography Protocols: Limitations of a Methodology Employing a Phantom with Location-Known Opacities

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