| Autor: |
van Straten M; Department of Medical Physics, Academic Medical Center, Amsterdam, The Netherlands. m.van.straten@solstitium.net, Venema HW, Hartman J, den Heeten GJ, Grimbergen CA |
| Jazyk: |
angličtina |
| Zdroj: |
Medical physics [Med Phys] 2004 Oct; Vol. 31 (10), pp. 2785-6. |
| DOI: |
10.1118/1.1796131 |
| Abstrakt: |
In multi-slice spiral computed tomography (CT) images interpolation artifacts are present. The relationship between the x-ray tube rotation angle and these artifacts is demonstrated. A head phantom was repeatedly scanned with a four-slice CT scanner at different pitch values. Two scans, made with identical scan parameters, nearly always have different x-ray tube starting angles. Consequently, artifacts appeared differently and residual artifacts appeared when subtractions were made. We conclude that only if the x-ray tube starting angle is equal for both scans or if a very low pitch is used, images are highly reproducible. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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