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Ten patients who underwent conventional coronary angiography(CA) were examined with both 8-and 16-slice multidetector-row computed tomography(MDCT) angiography within 6 months, and visibility and image quality of 16-slice MDCT-CA were compared with those of 8-slice MDCT-CA directly. In 136 segments determined by conventional CA, 101(74.3%) and 126(92.6%) segments were judged assessable by 8-and 16-slice MDCT-CA, respectively. Segment visibility in the right coronary and left circumflex arteries, as well as distal segments and small segments with diameters of< 3.0 mm, was higher using 16-slice MDCT-CA than that of 8-slice MDCTCA. As causes for invisibility in segments considered to be invisible, adjacent structures, as well as small diameters, were reduced by 16-slice MDCT-CA, suggesting that high spatial resolution contributes to higher visibility; however, nonassessable segments due to extensive calcium by 8-slice MDCT-CA were also judged nonassessable by 16-slice MDCT-CA.
Ten patients who underwent conventional coronary angiography (CA) were examined with both 8-and 16-slice multidetector-row computed tomography (MDCT) angiography within 6 months, and visibility and image quality of 16-slice MDCT-CA were compared with those of Segment visibility in the right coronary artery was evaluated by 8-and 16-slice MDCT-CA, respectively. and left left circumflex arteries, as well as distal segments and small segments with diameters of <3.0 mm, was higher using 16-slice MDCT-CA than that of 8-slice MDCTCA. As causes for invisibility in segments considered to be invisible, adjacent structures , as well as small diameters, were reduced by 16-slice MDCT-CA, suggesting that high spatial resolution contributes to higher visibility; however, nonassessable segments due to extensive calcium by 8-slice MDCT-CA were also judged nonassessable by 16-slice MDCT-CA.