First results of computerised tomographic angiography using electron beam tomography |
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Authors: | K J Lehmann G Weisser K W Neff S K Mai S Denk M Georgi |
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Institution: | Institut für Klinische Radiologie, Universit?tsklinikum Mannheim, Fakult?t für Klinische Medizin Mannheim der Universit?t Heidelberg, Theodor Kutzer Ufer, D-68135 Mannheim, Germany, DE
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Abstract: | The aim of this study was to evaluate the suitability of electron beam tomography (EBT) with fast continuous volume scanning
for CT angiography (CTA) in chest and abdomen. An Evolution XP EBT scanner with a new software version (12.34) was used. One
hundred forty images per study can be acquired in 17 s using 3-mm collimation and overlapping image reconstruction. Study
protocols for five different clinical applications of EBT CTA were established and evaluated. The EBT CTA technique was performed
in 155 patients. High- and homogeneous density values were achieved along the whole course of the vessels; the mean density
in the aorta was > 240 HU. Coeliac axis, superior and inferior mesenteric artery, renal and lumbar arteries were visualised
in all cases. Maximum intensity projection and shaded surface display reconstruction demonstrated the relation between aneurysm
and aortic branches very well due to an excellent resolution along the z-axis. In large scan volumes overlapping image reconstruction
demonstrated better resolution along the z-axis than is available with helical CT. The EBT CTA technique proved to be very
well suited excellent suitability for evaluation of pulmonary vessels. Compared with helical CT, EBT CTA offers a shorter
scan time, which allows higher contrast enhancement in pulmonary vessels. The identification of intraluminal emboli and mural
thrombi has improved. The EBT CTA technique is a very reliable tool for evaluation of aortic disease and pulmonary vessels.
Received: 17 June 1998; Revision received: 9 September 1998; Accepted: 29 September 1998 |
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Keywords: | : Computerised tomographic angiography Electron beam tomography Computed tomography Contrast enhancement |
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