Stråldos och bildkvalitet vid datortomografiundersökning av hjärna – En jämförande fantomstudie av olika datortomografers scanprotokoll

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Sammanfattning: Background: Technology development in computed tomography has led to more examinations being performed in diagnostic purposes. The increasing number of examination in CT has also led to more CT machines being bought to the clinics. It is common in a radiological department to have CT machines from different manufactures and with different models, especially in university hospitals. It is a difficulty to create uniformity between scan protocols due the computed tomography are structured differently.Purpose: To evaluate and compare the differences in radiation dose and image quality between the seven CTs´scanprotocols on Radiology department of Sahlgrenska University Hospital, with focus on routine brain.Method: A mixed-method study with experimental research methodology has been performed at Radiology BoIC, Sahlgrenska University Hospital. A head phantom has been examined with all seven CT scanners using the clinical scan protocols. The radiation dose and the image quality have been compared, reviewed and evaluated.Results: GE Revolution gave the lowest CTDIvol and Canon Prime gave the highest CTDIvol. GE Optima 660, GE HD 750 nr 1 and nr 2 gave similar CTDIvol. The image noise were higher from the Siemens scanners compared to the other CT scanners. The soft tissue structure in the phantom were visualized differently at the examinations viewing with thin slices. However, the structures from Canon Prime were more diffuse and less demarcate in comparison to the other examinations.Conclusion: Different computed tomography is built in their unique way. How the image quality presents at the end, are affected by many factors. There are differences in radiation dose and image quality in the seven computed tomography in the clinic. Small differences are also shown in the CT-scanners with the same model. Optimization of scan protocols can be accomplished by scanning phantoms to reduce radiation dose even more, while maintaining diagnostic acceptance.

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