Exposure of the Swiss Population by Radiodiagnostics: 2013 Review

Coultre, R. Le; Bize, Julie; Champendal, Mélanie; Wittwer, D.C.; Ryckx, Nick; Aroua, A.; Trueb, Ph. R.; Verdun, Francis R.

doi:10.1093/rpd/ncv462

Cited by 27 publications

(18 citation statements)

References 8 publications

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“…The two levels of dose were used to generate two independent image datasets. The 15 mGy acquisition corresponds to local dose reference level for abdominal imaging and is therefore representative of clinical practice. The scans were acquired and reconstructed with an abdominal protocol used routinely for clinical imaging on a multidetector CT (Discovery HD 750, GE Healthcare).…”

Section: Methodsmentioning

confidence: 99%

Inter‐laboratory comparison of channelized hotelling observer computation

Abbey

Baek³

et al. 2018

Medical Physics

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This intercomparison helped define the state of the art of model observer performance computation and with thirteen participants, reflects openness and trust within the medical imaging community. The performance of a CHO with explicitly defined channels and a relatively large number of test images was consistently estimated by all participants. In contrast, the paper demonstrates that there is no agreement on estimating the variance of detectability in the training and testing setting.

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Section: Methodsmentioning

confidence: 99%

Inter‐laboratory comparison of channelized hotelling observer computation

Abbey

Baek³

et al. 2018

Medical Physics

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“…Modern CT equipment and technique development have provided tools for potential dose reduction, but the collective population dose is still increasing due to the increase in the number of CT examinations performed. Studies focusing on the potential for dose reduction due to technical improvements are therefore urgently needed [1][2][3][4]. Standardization and optimization of clinical protocols is therefore advocated to keep the radiation dose as low as reasonably achievable (ALARA) [5] while the diagnostic confidence is maintained.…”

Section: Introductionmentioning

confidence: 99%

Assessment of image quality in abdominal computed tomography: Effect of model-based iterative reconstruction, multi-planar reconstruction and slice thickness on potential dose reduction

Kataria

Althén

Smedby

et al. 2020

European Journal of Radiology

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To determine the effect of tube load, model-based iterative reconstruction (MBIR) strength and slice thickness in abdominal CT using visual comparison of multi-planar reconstruction images. Method: Five image criteria were assessed independently by four radiologists on two data sets at 42-and 98-mAs tube loads for 25 patients examined on a 192-slice dual-source CT scanner. Effect of tube load, MBIR strength, slice thickness and potential dose reduction was estimated with Visual Grading Regression (VGR). Objective image quality was determined by measuring noise (SD), contrast-to-noise (CNR) ratio and noise-power spectra (NPS). Results: Comparing 42-and 98-mAs tube loads, improved image quality was observed as a strong effect of log tube load regardless of MBIR strength (p < 0.001). Comparing strength 5 to 3, better image quality was obtained for two criteria (p < 0.01), but inferior for liver parenchyma and overall image quality. Image quality was significantly better for slice thicknesses of 2mm and 3mm compared to 1mm, with potential dose reductions between 24%-41%. As expected, with decrease in slice thickness and algorithm strength, the noise power and SD (HU-values) increased, while the CNR decreased. Conclusion: Increasing slice thickness from 1 mm to 2 mm or 3 mm allows for a possible dose reduction. MBIR strength 5 shows improved image quality for three out of five criteria for 1 mm slice thickness. Increasing MBIR strength from 3 to 5 has diverse effects on image quality. Our findings do not support a general recommendation to replace strength 3 by strength 5 in clinical abdominal CT protocols. However, strength 5 may be used in taskbased protocols.

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“…A survey performed in 2006 in the United States showed that the average effective dose due to CT reached 1.5 mSv per capita, per year . The last surveys performed in Switzerland in 2008 and 2013 showed a similar trend, with the average dose per capita from CT increasing from 0.8 mSv to 1.0 mSv within this 5‐year period …”

Section: Introductionmentioning

confidence: 99%

“…2 The last surveys performed in Switzerland in 2008 and 2013 showed a similar trend, with the average dose per capita from CT increasing from 0.8 mSv to 1.0 mSv within this 5-year period. 3,4 e153…”

Section: Introductionmentioning

confidence: 99%

Objective comparison of high‐contrast spatial resolution and low‐contrast detectability for various clinical protocols on multiple CT scanners

et al. 2017

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Purpose: We sought to compare objectively computed tomography (CT) scanner performance for three clinically relevant protocols using a task-based image quality assessment method in order to assess the potential for radiation dose reduction. Methods: Four CT scanners released between 2003 and 2007 by different manufacturers were compared with four CT scanners released between 2012 and 2014 by the same manufacturers using ideal linear model observers (MO): prewhitening (PW) MO and channelized Hotelling (CHO) MO with Laguerre-Gauss channels for high-contrast spatial resolution and low-contrast detectability (LCD) performance, respectively. High-contrast spatial resolution was assessed using a custom-made phantom that enabled the computation of the target transfer function (TTF) and noise power spectrum (NPS). Low-contrast detectability was assessed using a commercially available anthropomorphic abdominal phantom providing equivalent diameters of 24, 29.6, and 34.6 cm. Three protocols were reviewed: a head (trauma) and an abdominal (urinary stones) protocol were applied to assess highcontrast spatial resolution performance; and another abdominal (focal liver lesions) protocol was applied for LCD. The liver protocol was tested using fixed and modulated tube currents. The PW MO was proposed for assessing high-contrast detectability performance of the various CT scanners. Results: Compared with older generation CT scanners, three newer systems displayed significant improvements in high-contrast detectability over that of their predecessors. A fourth, newer system had lower performance. The CHO MO was appropriate for assessing LCD performance and revealed that an excellent level of image quality could be obtained with newer scanners at significantly lower dose levels. Conclusions: This study shows that MO can objectively benchmark CT scanners using a task-based image quality method, thus helping to estimate the potential for further dose reductions offered by the latest systems. Such an approach may be useful for adequately and quantitatively comparing clinically relevant image quality among various scanners.

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Exposure of the Swiss Population by Radiodiagnostics: 2013 Review

Cited by 27 publications

References 8 publications

Inter‐laboratory comparison of channelized hotelling observer computation

Inter‐laboratory comparison of channelized hotelling observer computation

Assessment of image quality in abdominal computed tomography: Effect of model-based iterative reconstruction, multi-planar reconstruction and slice thickness on potential dose reduction

Objective comparison of high‐contrast spatial resolution and low‐contrast detectability for various clinical protocols on multiple CT scanners

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