Dosimetry for optimisation of patient protection in computed tomography

Jessen, K.; Shrimpton, Paul; Geleijns, Jacob; Panzer, W.; Tosi, G

doi:10.1016/s0969-8043(98)00024-4

Cited by 162 publications

(94 citation statements)

References 13 publications

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“…25 Effective dose is calculated from the dose length product (mGycm) taking into account the radiosensitivity of imaged organs, 80% of which is attributed to the thyroid. 26 One reason for this low risk is that most patients undergoing stroke workup are within the sixth to ninth decades, and exposure in this age group carries a low risk of excess cancer mortality because of decreased dose length product conversion factors. Although the individual risk of cancer with CT stroke workup seems to be small, databases have been developed for future large-scale epidemiological studies addressing CT-radiation risk.…”

Section: Discussionmentioning

confidence: 99%

Intraluminal Thrombus, Intraplaque Hemorrhage, Plaque Thickness, and Current Smoking Optimally Predict Carotid Stroke

McNally

McLaughlin

Hinckley

et al. 2015

Stroke

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Background and Purpose-Intraplaque hemorrhage (IPH) is associated with acute and future stroke. IPH is also associated with lumen markers of stroke risk including stenosis, plaque thickness, and ulceration. Whether IPH adds further predictive value to these other variables is unknown. The purpose of this study was to determine whether IPH improves carotid-source stroke prediction. Methods-In this retrospective cross-sectional study, patients undergoing stroke workup were imaged with MRI and IPH detection. Seven hundred twenty-six carotid-brain image pairs were analyzed after excluding vessels with noncarotid plaque stroke sources (420) and occlusions (7)

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Section: Discussionmentioning

confidence: 99%

Intraluminal Thrombus, Intraplaque Hemorrhage, Plaque Thickness, and Current Smoking Optimally Predict Carotid Stroke

McNally

McLaughlin

Hinckley

et al. 2015

Stroke

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“…All image acquisition was performed using prospective electrocardiogram (EKG)-triggering during a low-motion blood pressure interval at 78 % [16]. The effective radiation dose was estimated by multiplying the dose length product (DLP) by the conversion coefficients (0.014 mSv×Gycm -1 × cm -1 ) [17,18].…”

Section: Image Acquisitionmentioning

confidence: 99%

Impact of Hybrid Iterative Reconstruction on Agatston Coronary Artery Calcium Scores in Comparison to Filtered Back Projection in Native Cardiac CT

Obmann

Klink

Heverhagen

et al. 2015

Fortschr Röntgenstr

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Purpose: To investigate whether the effects of hybrid iterative reconstruction (HIR) on coronary artery calcium (CAC) measurements using the Agatston score lead to changes in assignment of patients to cardiovascular risk groups compared to filtered back projection (FBP). Materials and Methods: 68 patients (mean age 61.5 years; 48 male; 20 female) underwent prospectively ECG-gated, non-enhanced, cardiac 256-MSCT for coronary calcium scoring. Scanning parameters were as follows: Tube voltage, 120 kV; Mean tube current time-product 63.67?mAs (50???150?mAs); collimation, 2???128???0.625?mm. Images were reconstructed with FBP and with HIR at all levels (L1 to L7). Two independent readers measured Agatston scores of all reconstructions and assigned patients to cardiovascular risk groups. Scores of HIR and FBP reconstructions were correlated (Spearman). Interobserver agreement and variability was assessed with ?-statistics and Bland-Altmann-Plots. Results: Agatston scores of HIR reconstructions were closely correlated with FBP reconstructions (L1, R?=?0.9996; L2, R?=?0.9995; L3, R?=?0.9991; L4, R?=?0.986; L5, R?=?0.9986; L6, R?=?0.9987; and L7, R?=?0.9986). In comparison to FBP, HIR led to reduced Agatston scores between 97?% (L1) and 87.4?% (L7) of the FBP values. Using HIR iterations L1???L3, all patients were assigned to identical risk groups as after FPB reconstruction. In 5.4?% of patients the risk group after HIR with the maximum iteration level was different from the group after FBP reconstruction. Conclusion: There was an excellent correlation of Agatston scores after HIR and FBP with identical risk group assignment at levels 1 - 3 for all patients. Hence it appears that the application of HIR in routine calcium scoring does not entail any disadvantages. Thus, future studies are needed to demonstrate whether HIR is a reliable method for reducing radiation dose in coronary calcium scoring. Key Points: ??Agatston-Scores showed excellent correlation between HIR and FBP. ??The higher the HIR Level, the more Agatston scores deviated to lower values. ??No change in risk group assignment using Level 1???3. ??Change in risk group assignment when using HIR compared to FBP in 1.5?% (Level?4), 5.4?% (Level 5???7). Citation Format: ??Obmann VC, Klink T, Heverhagen JT et?al. Impact of Hybrid Iterative Reconstruction on Agatston Coronary Artery Calcium Scores in Comparison to Filtered Back Projection in Native Cardiac CT. Fortschr R?ntgenstr 2015; 187: 372???379

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“…These advantages over other diagnostic imaging modality have made CT a preferred imaging tools among physicians and the number of CT examinations is increasing every year. CT technology has seen rapid developments in recent times, with the introduction of multi-slice CT (MSCT) in 2001 [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Assessment of knowledge and awareness among radiology personnel regarding current computed tomography technology and radiation dose

Karim

Hashim

Bradley

et al. 2016

J. Phys.: Conf. Ser.

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Dosimetry for optimisation of patient protection in computed tomography

Cited by 162 publications

References 13 publications

Intraluminal Thrombus, Intraplaque Hemorrhage, Plaque Thickness, and Current Smoking Optimally Predict Carotid Stroke

Intraluminal Thrombus, Intraplaque Hemorrhage, Plaque Thickness, and Current Smoking Optimally Predict Carotid Stroke

Impact of Hybrid Iterative Reconstruction on Agatston Coronary Artery Calcium Scores in Comparison to Filtered Back Projection in Native Cardiac CT

Assessment of knowledge and awareness among radiology personnel regarding current computed tomography technology and radiation dose

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