Segmental distributions of calcifications and non-assessable lesions on coronary computed tomographic angiography: evaluation in symptomatic XXXX .

@entity1 @entity301 @entity730 @entity460 @entity729
PURPOSE: To clarify the frequency and distribution pattern of calcifications in all and in only non-assessable coronary arterial segments in symptomatic @entity1 with @entity301 . MATERIALS AND METHODS: Among 2355 consecutive coronary CT angiographies performed using a 320-row ADCT, 1129 studies performed by prospective one-beat scanning without metallic and motion artifacts were evaluated. Frequency and degree of @entity730 were assessed for each coronary segment. Evaluations were performed in all and in only non-assessable segments, and the results were compared. RESULTS: Calcified segments were observed in 15.6  % of @entity1 and 2.4  % of segments. The most extensively calcified segments were those in the proximal left anterior descending branch. 1.1  % of all of the segments were not assessable due to @entity730 , and 90  % of those non-assessable segments had high-grade calcifications. When the @entity460 score value was 1000 or 2000, the expected frequency of non-assessable segments was 27.5 or 53.5  %, respectively. CONCLUSION: There were specific features of the distribution of @entity729 . It is important to be familiar with these features when deciding whether or not to perform subtraction CCTA.
