Objective   To investigate the three-dimensional imaging features of the feeding arteries in patients with thyroid cancer by using 64-slice helical CT angiography.     Methods   The scanning data of 101 cases (including 65 cases of normal control and 36 cases with pathologically-confirmed thyroid cancer) who agreed with this investigation and received neck enhanced 64-slice CT were processed on AW 4.2 workstation were collected. Spatial anatomical characters of the feeding arteries in patients with thyroid cancer were observed and analyzed using volume rendering (VR)

maximum intensity projection (MIP)

multiplanar reconstruction (MPR) and advanced vessel analyze (AVA).     Results   All the feeding arteries of tumor in thyroid cancer group were thyroid arteries (76 rami). Three-dimensional imaging features of these feeding arteries such as origins

numbers and inner diameters were showed exactly. The resource of feeding arteries had 3 patterns: merely superior thyroid arteries feeding 18 cases (50%)

merely inferior thyroid arteries feeding 6 cases (16.67%) and both superior and inferior thyroid arteries feeding 12 cases (33.33%).    Conclusion   All the feeding arteries of thyroid cancer are thyroid arteries

and 64-slice helical CT angiography can clearly visualize the features.