Performance of Contrast Enhanced Magnetic Resonance Angiography 55 The characteristics of the total group of 189 eligible and of the 75 (39.7%) included patients are given in Table 2. The parameters of the included patients did not differ significantly from the total group of eligible patients. All patients included in the study underwent DSA as part of their endovascular treatment or during diagnostic work-up, and these DSA studies were used as the standard of reference. Table 2. Characteristics of the total group of eligible patients and the included patients. Total eligible pt Included pt P-value N 189 75 Female (%) 138 (73) 54 (72) 0.88 Mean age 54.5 54.0 SD age 13.9 15.1 Pt without aneurysm (%) 40 (21.2) 18 (24.0) 0.62 Total aneurysms 189 65 The quality of CTA images was rated as good in 62.7% (47/75) by Observer 1 and 72% (54/75) by Observer 2, and that of the CEMRA images as good in 82.7% (62/75) by Observer 1 and 86.7% (65/75) by Observer 2. The confidence rating of their final scoring per aneurysm (and per patient with no aneurysm) was ‘good’ in respectively 84.3% (70/83, Observer 1) and 91.6% (76/83, Observer 2) for CTA; and 88.0% (73/83, Observer 1) and 94% (78/83, Observer 2) for CEMRA. There were 18 patients without an aneurysm. Fifty patients harbored one aneurysm, six patients had two aneurysms and one patient harbored three aneurysms, making a total of 65 aneurysms. Locations of the aneurysms are given in Table 3. Table 3. Location of the aneurysms N Internal carotid artery, including posterior communicating artery, carotid tip and 14 ophtalmic artery Anterior cerebral artery, including anterior communicating artery 19 Middle cerebral artery 20 Vertebrobasilar complex, (basilar tip) 12 (8) Scoring results of the two observers for CTA and CEMRA are given in 2x2-tables (Tables 4a and 4b). Table 4a. 2 x 2 table of both observers assessing the CTA images. CTA Observer 1 Observer 2 - + - + 18a - 17 1 17 1 DSA b 65 + 6 59 5 60 Total 23 60 22 61 a b Number of patients without an aneurysm. Total number of aneurysms.
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