Advances in CT III: 3rd European Scientific User Conference by J. Regn, J. Ezrielev, R. Hupke, W. A. Kalender, K. Maatsch

By J. Regn, J. Ezrielev, R. Hupke, W. A. Kalender, K. Maatsch (auth.), Professor Dr. H. Pokieser, Professor Dr. G. Lechner (eds.)

In approximately all components of expertise our iteration is experiencing the phenomena of fast moving innovation and nice bursts in improvement. in addition to the thoroughly new thoughts, the "experienced consumer" is astonished while evidently strong and appar­ ently matured know-how comparable to the subsequent to final new release of CT apparatus undergoes additional improvement, similar to is the case with the spiral CT process. the big capability of spiral CT without notice grew to become obvious, stimulating and giving upward push to quite a lot of study on its scientific software. over again we will be able to see within the box of imaging how nice advances in a single process competitively have an effect on the diversity of program in one other. therefore this can be very worthy and essential to appraise the present state of affairs now. either physicians - who use the gear - and the future health process and with this the sufferer - which funds it - have the duty and the correct to everlasting optimization of the applying ideas of diagnostic strategies. now not least, this symposium additionally intended to slot the recent voice of spiral CT harmo­ niously into the symphonic rating of diagnostic techniques. the big radiodiagno­ stic division ofthe college clinics which has been tested on the Neues All­ gemeines Krankenhaus in Vienna, Austria, is proud to have together prepared this consumer symposium with Siemens.

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Start delay was determined from a test bolus of 10 ml contrast medium. It varied from 10 to 34 s (mean 18 s) in thoracic studies and from 14 to 46 s (mean 23 s) in abdominal studies. In thoracic studies, the venous approach was cubital in 60 cases and femoral in 27 cases. A power injector was used to inject up to 160 ml of contrast medium with a flow of3 -4 mlls. 0 cm). The reconstruction interval usually was set to 2 mm. Cine mode, multiplanar reformations (MPRs) and - where warranted - maximum intensity projections (MIPs) and three-dimensional surface shaded displays (3D SSDs) were used for evaluation.

Another manifestation of movement artefact in a patient without dissection. a There is a rind of poor enhancement on the left anterior aspect of the aorta which could possibly be due to an unenhanced false lumen. b However, this rind cannot be seen on an image reconstructed 200 ms earlier. c The aorta in b is outlined by a region of interest. d Superimposition of the region of interest on a shows that the aorta has moved within the xy plane and thus the poor "enhancement" can be accounted for by partial volume effect Results Of the 54 patients referred, CT demonstrated definite aortic dissection in 22 (type A: 12, Type B: 10).

Radiology 190 : 16 - 17 10. Nienaber CA, Spielman RP, von Kodolitsch Y et al. (1992) Diagnosis of thoracic aortic dissection: magnetic resonance imaging versus transesophageal echocardiography. Circulation 85 :434-447 11. Petasnick JP (1991) Radiologic evaluation of aortic dissection. Radiology 180: 297 -305 12. Set PA, Lomas DJ, Maskell GF, Flower CDR, Dixon AK (1993) Artefacts in the ascending aorta on computed tomography: another measure of aortic distensibility? EJR 16 : 107 -Ill 13. Thorsen MK, San Dretto MA, Lawson TL, Foley WD, Smith DF, Berland LL (1983) Dissecting aortic aneurysms: accuracy of computed tomographic diagnosis.

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