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AJNR - American Journal of Neuroradiology

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Image Quality of Multisection CT of the Brain: Thickly Collimated Sequential Scanning versus Thinly Collimated Spiral Scanning with Image Combining

M. van Straten^a, H.W. Venema^a,b, C.B.L.M. Majoie^b, N.J.M. Freling^b, C.A. Grimbergen^a and G.J. den Heeten^b

^a Department of Medical Physics, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands
^b Department of Radiology, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands

View larger version (8K): [in this window] [in a new window]   Fig 1. Section sensitivity profiles for sequential mode (diamonds) and spiral mode (dashed line). The continuous line depicts the profile of 4 combined spiral mode images with an increment of 1.2 mm (positions of each image given by asterisks on the z-axis).

View larger version (41K): [in this window] [in a new window]   Fig 2. Cross-sectional images of the skull base. A, Sequential technique. Severe streak artifacts are shown in the skull base. B, Spiral technique.

View larger version (15K): [in this window] [in a new window]   Fig 3. Cross-sectional images of the upper cranium. A, Sequential technique. This image shows an increase of the CT values of the brain tissue, especially near the skull. B, Spiral technique.

View larger version (39K): [in this window] [in a new window]   Fig 4. Cross-sectional images of the middle region of the brain. The spiral image has a higher contrast between the gyri and the CSF in the frontal region. Both observers had a slight preference for the spiral image with respect to "overall image quality," "visualization of brain tissue near the skull," and "image noise." A, Sequential technique. B, Spiral technique.