By Stefan Ulzheimer, Thomas Flohr (auth.), Maximilian F. Reiser, C.R. Becker, Konstantin Nikolaou, Gary Glazer (eds.)
This 3rd revised variation of Multislice CT offers a finished replace at the most up-to-date advancements and tendencies within the software of this intriguing process. Following an preliminary part at the most vital technical facets and matters, specific info is equipped on a variety of diagnostic functions. Imaging of the top and neck, the cardiovascular procedure, and the lungs is roofed extensive, and a different part considers the appliance of multislice CT in quite a few tumors. Radiation publicity, CT angiography, dual-energy imaging, and interventions all obtain shut consciousness, and a last bankruptcy examines the function of multislice CT in trauma administration. various hugely skilled and recognized authors have contributed chapters from a variety of views, highlighting the probabilities provided by way of the main glossy multidetector CT structures. This ebook should be really beneficial for common clients of CT structures who desire to improve not just their machines but in addition their knowledge.
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Example text
Regardless of the number of X-ray tubes, the table feed must be sufficiently slow such that projection data of 180° gantry rotation are available for image reconstruction at all points in time and space even in patients with variable heart rate. Though radiation exposure can be markedly reduced by tube current modulation and use of a smaller safety window for variable heart rates, the principle of overlapping data acquisition in helical scanning and the ensuing higher radiation exposure remain.
The reconstruction filters (kernels) are the same for all four-scan modes, leading to a uniform image appearance when different modes are combined. All image data can be automatically or retrospectively sent to different network nodes (PCs, workstations, archives) in the conventional DICOM format; the new enhanced- CT DICOM format is also available, which is faster and requires less storage capacity. The low-contrast and high-contrast resolution of the 320-detector-row CT does not differ from the conventional 64-detector-row CT scan from the same manufacturer.
3a and Fig. 3d demonstrates that the cupping artifact due to scatter could be removed. 39 40 N. Strobel et. al. a b c d Fig. 3a–d. C-arm CT data sets computed using syngo DynaCT based on 2D X-ray projections acquired on an AXIOM Artis dTA system (both Siemens AG, Healthcare Sector, Forchheim, Germany) with correction techniques turned off/on. An axial abdominal slice without scatter correction is shown in (a). The same image reconstructed without truncation correction is depicted in (b). Another result obtained without ring correction can be found in (c), and a reference section involving all correction steps is demonstrated in (d) (images courtesy of Dr.