By Vahid Yaghmai MD, Dushyant V Sahani MD
Regardless of technical advances utilizing MR and the emergence of puppy imaging, CT is still an often used imaging modality that has now not stood nonetheless whereas others have thrived. Advances in CT have persisted apace with different modalities that have taken CT into new components of imaging that quite a few brief years in the past it might probably now not technique. With the arrival of 64-slice CT, a better variety of photos should be taken in a miles speedier time period. using CT perfusion within the mind and stomach are reviewed during this factor. leading edge options akin to 4D CT and twin strength CT might be mentioned, in addition to CT purposes for imaging of the coronary arteries and cardiac valves.
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Extra resources for Advances in MDCT, An Issue of Radiologic Clinics
Funama Y, Awai K, Nakayama Y, et al. Radiation dose reduction without degradation of low-contrast detectability at abdominal multisection CT with a low-tube voltage technique: phantom study. Radiology 2005;237(3):905–10. 38. McCollough CH, Bruesewitz MR, Kofler JM Jr. CT dose reduction and dose management tools: overview of available options. Radiographics 2006; 26(2):503–12. 39. Nakayama Y, Awai K, Funama Y, et al. Abdominal CT with low tube voltage: preliminary observations about radiation dose, contrast enhancement, image quality, and noise.
Mathematical phantoms representing children of various ages for use in estimates of internal dose. Oak Ridge (TN): Oak Ridge National Laboratory; 1980. NUREG/CR-1159, ORNL/NUREG/TM-367. 20. Bongartz G, Golding S, Jurik A, et al. European guidelines for multislice computed tomography. Funded by the European Commission. Contract number FIGM-CT2000-20078-CT-TIP. March 2004. 21. Shrimpton PC, Hillier MC, Lewis MA, et al. National survey of doses from CT in the UK: 2003. Br J Radiol 2006;79(948):968–80.
This switching necessitates doubling the number of projections per rotation to maintain image quality, thereby requiring refinements at the tube and detector levels. The principle advantage of this technique is that it offers the potential to perform dual-energy processing using projection data acquired in both axial and helical modes, theoretically permitting accurate material decomposition and monochromatic CT image display, which should substantially decrease image artifacts. The disadvantage of this technique is that the low- and high-energy scans are limited to the same filtration and hence the spectra separation of the two energies is suboptimal.