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1.
Singapore Med J ; 2021 Oct 24.
Article in English | MEDLINE | ID: mdl-34688230

ABSTRACT

INTRODUCTION: Computed tomography angiography of the aorta (CTAA) is the modality of choice for investigating aortic disease. Our aim was to evaluate image quality, contrast enhancement and radiation dose of electrocardiograph (ECG)-triggered and non-ECG-triggered CTAA on a 256-slice single source CT scanner. Knowledge of these will allow requesting clinician and radiologist to balance radiation risk and image quality. METHODS: We retrospectively assessed data from 126 patients who had undergone CTAA on a single-source CT scanner using ECG-triggered (group 1, n = 77) or non-ECG-triggered (group 2, n =49) protocols. Radiation doses were compared. Qualitative (4-point scale) and quantitative image quality assessments were performed. RESULTS: The mean volume CT dose index, dose length product and effective dose in group 1 were 12.4 ± 1.9 mGy, 765.8 ± 112.4 mGy x cm and 13.0 ± 1.9 mSv, respectively. These were significantly higher compared with group 2 (9.1 ± 2.6 mGy, 624.1 ± 174.8 mGy x cm and 10.6 ± 3.0 mSv, respectively) ( p < 0.001). Qualitative assessment showed image quality at the aortic root-proximal ascending aorta was significantly higher in group 1 (median = 3) than in group 2 (median = 2, p < 0.001). Quantitative assessment showed significantly better mean arterial attenuation, signal-to-noise ratio and contrast-to-noise ratio in ECG-triggered CTAA compared with non-ECG-triggered CTAA. CONCLUSION: ECG-triggered CTAA in a single-source scanner has superior image quality and vessel attenuation of aortic root/ascending aorta but a higher radiation dose of approximately 23%. Its use should be considered specifically when assessing aortic root/ascending aorta pathology.

2.
J Am Coll Radiol ; 17(6): 717-723, 2020 Jun.
Article in English | MEDLINE | ID: mdl-32298643

ABSTRACT

As coronavirus disease 2019 (COVID-19) infection spreads globally, the demand for chest imaging will inevitably rise with an accompanying increase in risk of disease transmission to frontline radiology staff. Radiology departments should implement strict infection control measures and robust operational plans to minimize disease transmission and mitigate potential impact of possible staff infection. In this article, the authors share several operational guidelines and strategies implemented in our practice to reduce spread of COVID-19 and maintain clinical and educational needs of a teaching hospital.


Subject(s)
Communicable Disease Control/organization & administration , Coronavirus Infections/prevention & control , Infection Control/organization & administration , Infectious Disease Transmission, Patient-to-Professional/prevention & control , Pandemics/statistics & numerical data , Pneumonia, Viral/prevention & control , Radiology Department, Hospital/organization & administration , COVID-19 , Coronavirus Infections/diagnostic imaging , Cross Infection/prevention & control , Disease Outbreaks/prevention & control , Disease Outbreaks/statistics & numerical data , Female , Humans , Magnetic Resonance Imaging/methods , Male , Occupational Health , Organizational Innovation , Outcome Assessment, Health Care , Pandemics/prevention & control , Pneumonia, Viral/diagnostic imaging , Singapore , Tomography, X-Ray Computed/methods
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