[Assessment of coronary stent lumen visibility and patency by 64-slice spiral CT angiography].
OBJECTIVE
To evaluate the clinical value of assessment of coronary stent patency by 64-slice spiral CT coronary angiography.


METHODS
Totally 29 patients (59 stents) were investigated using a retrospective ECG-gated enhanced scan by 64-slice spiral CT at a mean interval of (28.4 +/- 21.2) months after coronary stent implantation. Axial multi-planar reconstruction (MPR) of the stents and curved-planar reconstruction (CPR) through the stents were evaluated for image quality on a 5-point scale (1 = excellent, 5 = uninterpretable) and lumen diameter. Stent lumen diameter was compared with the vessel diameter proximal of the stents to assess the in-stent lumen visibility. Conventional coronary angiography was performed in 5 patients, and 9 stents were evaluated.


RESULTS
The image quality was good to excellent on average (scores: 1.94 +/- 0.84), depending on heart rate, breath movement, and stent location. Stent lumen was visible, on average a percentage off (76.1 +/- 11.1)% of the lumen diameter. All the 9 stents were correctly detected as being patent, which was confirmed by conventional coronary angiography.


CONCLUSIONS
64-slice spiral CT is a useful tool to assess the coronary stent patency.
Department of Radiology, PUMC Hospital, CAMS and PUMC, Beijing 100730, China.
Ling-yan
LY
Kong
Zheng-yu
ZY
Jin
Yi-ning
YN
Wang
Lan
L
Song
Zhu-hua
ZH
Zhang
Li-ren
LR
Zhang
Shu-yang
SY
Zhang
Song-bai
SB
Lin
Yun
Y
Wang
Wen-min
WM
Zhao
D000328:Adult; D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D017023:Coronary Angiography / Q000379:methods*; D023903:Coronary Restenosis / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D015607:Stents; D036542:Tomography, Spiral Computed / Q000379:methods*; D014654:Vascular Patency