Can use of adaptive statistical iterative reconstruction reduce radiation dose in unenhanced head CT? An analysis of qualitative and quantitative image quality
| Autor: | Bjørn Helge Østerås, Hilde Kjernlie Andersen, Hans Kristian Pedersen, Anne Catrine Trægde Martinsen, Kristin Livelten Heggen |
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| Rok vydání: | 2016 |
| Předmět: |
iterative reconstruction
Image quality business.industry Research qualitative image quality quantitative image quality Radiation dose General Medicine Iterative reconstruction 030218 nuclear medicine & medical imaging head CT 03 medical and health sciences 0302 clinical medicine Image noise Medicine Computer vision Artificial intelligence radiation dose Dose Reduced Nuclear medicine business Computed tomography (CT) 030217 neurology & neurosurgery |
| Zdroj: | Acta Radiologica Open |
| ISSN: | 2058-4601 |
| DOI: | 10.1177/2058460116645831 |
| Popis: | Background Iterative reconstruction can reduce image noise and thereby facilitate dose reduction. Purpose To evaluate qualitative and quantitative image quality for full dose and dose reduced head computed tomography (CT) protocols reconstructed using filtered back projection (FBP) and adaptive statistical iterative reconstruction (ASIR). Material and Methods Fourteen patients undergoing follow-up head CT were included. All patients underwent full dose (FD) exam and subsequent 15% dose reduced (DR) exam, reconstructed using FBP and 30% ASIR. Qualitative image quality was assessed using visual grading characteristics. Quantitative image quality was assessed using ROI measurements in cerebrospinal fluid (CSF), white matter, peripheral and central gray matter. Additionally, quantitative image quality was measured in Catphan and vendor’s water phantom. Results There was no significant difference in qualitative image quality between FD FBP and DR ASIR. Comparing same scan FBP versus ASIR, a noise reduction of 28.6% in CSF and between −3.7 and 3.5% in brain parenchyma was observed. Comparing FD FBP versus DR ASIR, a noise reduction of 25.7% in CSF, and −7.5 and 6.3% in brain parenchyma was observed. Image contrast increased in ASIR reconstructions. Contrast-to-noise ratio was improved in DR ASIR compared to FD FBP. In phantoms, noise reduction was in the range of 3 to 28% with image content. Conclusion There was no significant difference in qualitative image quality between full dose FBP and dose reduced ASIR. CNR improved in DR ASIR compared to FD FBP mostly due to increased contrast, not reduced noise. Therefore, we recommend using caution if reducing dose and applying ASIR to maintain image quality. |
| Databáze: | OpenAIRE |
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