A New Era in Computed Tomographic Dose Optimization

Kordolaimi, Sofia; Argentos, Stylianos; Pantos, Ioannis; Kelekis, Nikolaos; Efstathopoulos, Efstathios

doi:10.1097/rct.0b013e318282d95a

Cited by 31 publications

(4 citation statements)

References 73 publications

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“…Images reconstructed with iterative reconstruction (IR) have different image characteristics which may alter the detectability of lesions. Although lowered noise of IR image improves the visibility the faint nodules, IR images are known to appear "plastic-like" or blurred [19], which might obscure small ground-glass nodules. As the balance of two opposing effects depends on the type and the implementation method of IR, it is difficult to make a generalized conclusion about the impact of IR on the nodule detection task.…”

Section: Discussionmentioning

confidence: 99%

Efficiency and reproducibility in pulmonary nodule detection in simulated dose reduction lung CT images

Kubo

Kishimoto

Togashi

2019

European Journal of Radiology Open

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To determine the reproducibility and productivity of reduced dose chest computed tomography (CT) using a nodule detection task. Materials and methods: Eighty-eight consecutive non-contrast CT examinations were performed using an automatic exposure system with a reference standard deviation of 8.5. Simulated raw data of a reduced dose scan (standard deviation at 21 and 29) were generated with a dose simulator. Original and simulated raw data were reconstructed to series of 7-mm-thick images (Original, Simulation A, Simulation B). In the first part of the reading experiment, three readers independently interpreted these images (88 cases × 3 series) and recorded the size, type, and location of the pulmonary nodules. The reading time for every case was recorded. In the second part of the experiment, the repeated interpretation of standard dose images was performed by two readers. Concordance or discordance of nodule detection between the first and the repeated reading result was assessed. Results: A statistically significant difference in the detected nodule counts for lesions less than 5 mm by one reader was observed in simulation B images. Discordance of the interpretation result was found only in groundglass nodules larger than 5 mm detected by one reader in simulation B images. There was no statistically significant difference in the reading time among the three image types. Conclusion: Simulated standard deviation 21 images can reproduce the image interpretation result of original images, whereas simulated standard deviation 29 images may compromise the accuracy of nodule assessment. The effect on the reading time was not observed with dose reduction simulation.

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Section: Discussionmentioning

confidence: 99%

Efficiency and reproducibility in pulmonary nodule detection in simulated dose reduction lung CT images

Kubo

Kishimoto

Togashi

2019

European Journal of Radiology Open

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“…Iterative reconstruction algorithms enabling image noise reduction without substantially affecting the anatomic details are useful in reducing the CT radiation dose, and the image quality is comparable to or better than that of filtered back projection (66566). It is not surprising that CT images reconstructed using these new algorithms are not always favorably ranked by radiologists with different and complex subjective criteria and opinions.…”

Section: Radiation Dose Reduction and Optimizationmentioning

confidence: 99%

User-Friendly Vendor-Specific Guideline for Pediatric Cardiothoracic Computed Tomography Provided by the Asian Society of Cardiovascular Imaging Congenital Heart Disease Study Group: Part 1. Imaging Techniques

et al. 2019

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Optimal performance of pediatric cardiothoracic computed tomography (CT) is technically challenging and may need different approaches for different types of CT scanners. To meet the technical demands and improve clinical standards, a practical, user-friendly, and vendor-specific guideline for pediatric cardiothoracic CT needs to be developed for children with congenital heart disease (CHD). In this article, we have attempted to describe such guideline based on the consensus of experts in the Asian Society of Cardiovascular Imaging CHD Study Group. This first part describes the imaging techniques of pediatric cardiothoracic CT, and it includes recommendations for patient preparation, scan techniques, radiation dose, intravenous injection protocol, post-processing, and vendor-specific protocols.

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“…Dose optimization contributes to significant reduction in radiation dose to adults [ 15 ] and understanding CT exposure parameters is a prerequisite for dose optimization [ 16 ]. For example, any change in kVp affects the image noise, contrast and patient dose [ 17 ], mAs determines image noise and patient dose [ 18 ], ATCM reduces radiation dose by up to 25–50% in children and adults [ 19 , 20 ], and iterative reconstruction algorithms is reported to be a new era in CT optimization providing high quality images with 28–98% dose reduction [ 21 ]. Therefore, there is a need to understand the appropriate strategies to optimize CT examinations in order to comply with the ALARA principle.…”

Section: Introductionmentioning

confidence: 99%

Knowledge of CT exposure parameters among Norwegian student radiographers

Kada

2020

BMC Med Educ

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Background Improvements in the competency levels of student radiographers in computed tomography examinations (CT) are important due to the increasing number of these examinations being undertaken in imaging departments. The present study assesses the knowledge of student radiographers regarding CT exposure parameters. Methods The level of knowledge related to CT exposure parameters was evaluated using a twenty-one-item questionnaire that was distributed to final-year student radiographers. The questionnaire consisted of questions around CT exposure parameters and either allowed respondents to answer “true,” or “false” or choose a response from a range of responses where only one answer was correct. Correct answers were given one mark, while no mark was given for an incorrect answer. The score out of possible 21 was converted to a percentage, with a higher percentage signifying greater knowledge. Results Seventy-two students completed and returned the questionnaire, resulting in a 71% response rate. The mean score was 53%. Only 33% of students correctly identified that kilovoltage peak (kVp) should be increased when patients have metallic implants, and milliampere seconds (mAs) should be increased as body part thickness increases. No one answered all the questions correctly. There was no significant knowledge difference between students who had CT facilities on campus and those that did not. Conclusion Overall, student radiographers’ knowledge of CT exposure parameters was reported to be satisfactory.

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A New Era in Computed Tomographic Dose Optimization

Cited by 31 publications

References 73 publications

Efficiency and reproducibility in pulmonary nodule detection in simulated dose reduction lung CT images

Efficiency and reproducibility in pulmonary nodule detection in simulated dose reduction lung CT images

User-Friendly Vendor-Specific Guideline for Pediatric Cardiothoracic Computed Tomography Provided by the Asian Society of Cardiovascular Imaging Congenital Heart Disease Study Group: Part 1. Imaging Techniques

Knowledge of CT exposure parameters among Norwegian student radiographers

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