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Congress: ECR25
Poster Number: ESI-16571
Type: EuroSafe Imaging Poster
DOI: 10.26044/ecr2025/ESI-16571
Authorblock: S. Rees, S. Wicks, G. Havariyoun, J. Clinch; London/UK
Disclosures:
Sian Rees: Nothing to disclose
Sarah Wicks: Nothing to disclose
Glafkos Havariyoun: Nothing to disclose
James Clinch: Nothing to disclose
Keywords: Radiation physics, Radioprotection / Radiation dose, CT, Equipment, Physics, Radiation safety, Quality assurance
Purpose or learning objective Computed tomography (CT) scanner daily quality assurance (QA) is essential in ensuring patient safety and optimal image quality.For Siemens, scanners perform self-tests using the manufacturer’s water phantom; the phantom is scanned in air with fixed parameters in both Head and Body mode. Regions of interest (ROIs) are positioned in the centre and periphery of the phantom, and measurements are made of noise, uniformity, and CT number of water over a number of slices.If any result in the ROIs measured exceed...
Read more Methods or background Software was developed, using Python 3, to read the manually exported PDF reports, convert into text file format and extract relevant data. Difficulties arose in data extraction due to variations in formatting of PDFs, and also due to differing numbers of slices analysed in some instances.Any duplicated input PDFs are ignored, but repeats of QA performed on the same day are analysed.   Keywords were used to find the required data, including scanner details, test results and tolerance values.The software outputs...
Read more Results or findings Analysis of results showed several noticeable features:1. Head and Body mode differencesOn the whole, results between Head and Body mode follow the same pattern, though with an offset. All test results for Site A are shown in Figure 1, and the same pattern is displayed in the other scanners. [fig 1] It is understood that Head and Body modes do not use different bowtie filters – Siemens use the smaller ‘Narrow’ filter for paediatric and cardiac scans – but there are some differences...
Read more Conclusion Making use of the vast amount of data accumulated from performing daily QA can provide further insight into tube performance trends that cannot be visualised with from annual Medical Physics QC tests. From what can be interpreted from the manufacturer service reports, all significant changes and repairs have an effect on Daily QA test results that can be visualised. Additional data will be needed to determine whether there are trends common to tube aging or failure, as there was only once...
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