By U. Joseph Schoepf, Felix G. Meinel
With the appearance of multidetector-row know-how, pleasure has lower back to computed tomography. it really is now attainable to photo speedier and with higher answer than ever earlier than; extra importantly, the improvement of refined photograph acquisition suggestions has accredited using CT imaging in components formerly notion to lie past its scope. the information, event, and imaginative and prescient of a bunch of popular overseas specialists in state of the art thoracic purposes of multidetector-row CT are condensed inside of this publication. the result's a serious, complete assessment of the unconventional possibilities, but in addition the hot demanding situations, led to via the advance of ever-faster CT acquisition techniques.
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Example text
1987). 5-mm sections, 510 mAs, and CTDI methodology in a head-sized (16 cm) CT quality-control phantom. The CTDI measurement was designed to facilitate dose comparisons between CT scanners and was not appropriate to describe the relative dose of HRCT. As previously noted, the effective dose is a better measure as it takes into account the significant reduction in radiation risk associated with the noncontiguous sections used in HRCT. With 10-mm intersection gaps the effective dose of HRCT is 10% that of either conventional contiguous CT sections or spiral CT with a pitch of 1.
The MPRs are free of cone-beam artefacts, thus demonstrating that a cone correction is not required. Instead, due to the smaller slice width and the improved axial sampling compared with a scan with 4×1-mm collimation, the stents show fewer geometric distortions and a reduction of the blooming artefact. 3 ECG-Gated Sixteen-Slice Spiral CT: Extended ACV The ACV reconstruction as well as all other ECG-gated multi-slice spiral reconstruction approaches used so far neglect the cone-angle of the measurement rays.
Pediatr Radiol 32:272–279 Huda W, Atherton JV (1995) Energy imparted in computed tomography. Med Phys 22:1263–1269 ICRP-60 (1991) Recommendations of the International Commission on Radiological Protection. Pergamon Press, Oxford International Electrotechnical Commission I (2002) Amendment 1 to IEC 60601-2-44, 2nd edn. Medical electrical equipment, parts 2--44: Particular requirements for the safety of X-ray equipment for computed tomography – final draft international standard. International Electrotechnical Commission, Geneva, pp 1–7 Itoh H, Ikeda M, Arahata S et al.