A method of predicting the image noise in paediatric multi-slice computed tomography images
| Autor: | M. Gustavsson, A. Thilander Klang, S. Johansson, L. M. Wiklund, K. Ledenius, J. Söderberg, F. Stålhammar |
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| Rok vydání: | 2005 |
| Předmět: |
Thorax
Radiography Abdominal Tomography Scanners X-Ray Computed Computed tomography Radiation Dosage Noise (electronics) Image noise medicine Humans Radiology Nuclear Medicine and imaging Radiation Radiological and Ultrasound Technology medicine.diagnostic_test business.industry Phantoms Imaging Detector Public Health Environmental and Occupational Health Water Multi slice General Medicine Radiographic Image Enhancement Homogeneous Radiographic Image Interpretation Computer-Assisted Radiography Thoracic Nuclear medicine business Artifacts Tomography X-Ray Computed Head |
| Zdroj: | Radiation protection dosimetry. 114(1-3) |
| ISSN: | 0144-8420 |
| Popis: | The purpose of this study was to develop an equation with which to determine the tube current to be used in order to obtain a certain image noise level for differently sized children undergoing multi-slice computed tomography examination. The relationship between image noise and detector dose for different examination protocols was established for a LightSpeed Ultra, an eight slice CT from GEMS, using homogeneous water phantoms of different sizes. Three different anatomical areas (head, thorax and abdomen) were studied in 111 patients between 0 and 17 y of age. The mean ratio between the calculated and the measured noise in patient images was established for the different areas. Head examinations showed the best correlation (measured-to-calculated noise ratio = 1.01). In the thorax, the calculated noise was generally higher than the measured noise (ratio = 0.74), and in the abdomen, the opposite result was found (ratio = 1.20). |
| Databáze: | OpenAIRE |
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