By U. Joseph Schoepf
Prime clinicians and researchers from worldwide evaluate the entire scope of present advancements, examine, and clinical controversy concerning the ideas and functions of cardiac CT. Richly illustrated with quite a few black-and-white and colour photographs, the ebook discusses the translation of CT pictures of the guts in various scientific, physiological, and pathological purposes. The authors emphasize present cutting-edge makes use of of CT, but in addition research advancements on the horizon. additionally they overview the technical foundation of CT snapshot acquisition, in addition to instruments for picture visualization and research.
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Additional resources for CT of the Heart Principles and Applications
The presence of heavy coronary calcification may limit the value of CT coronary imaging, because beam hardening and partial volume effects, and an inability to distinguish between calcium and contrast, can completely obscure the coronary lumen. Metal objects such as stents, surgical clips, and sternal wires can also obscure the evaluation of underlying structures. Use of the thinnest possible slice width reduces partial-volume artifacts and improves visualization of calcified coronary segments.
Diagnostically adequate image quality should be provided at the minimum radiation exposure possible. Therefore, scan protocols have to be developed for different applications with optimized image quality, spatial resolution, and radiation exposure. Various publications are available that discuss the radiation exposure of MSCT in cardiac applications (32,33). The calculation of patient dose from CT examinations has become more complex since the introduction of multislice scanners. Not only is dose related to tube current and voltage and exposure time, but also to slice thickness and helical/ spiral pitch.
4 mm image increment. A computer model of an anthropomorphic heart phantom demonstrates the clinical relevance of the increased spatial resolution with 16-slice CT acquisition (Fig. 6). The model includes contrast-enhanced coronary arteries containing stents and atherosclerotic plaques of known dimensions and categories. Data sets from 16-slice scanners can be reconstructed with different image widths for optimization of the trade-off between spatial resolution and signal-to-noise ratio for specific clinical applications.