Biopsy guided by real-time virtual navigation system using computed tomography imaging data:a phantom study / 中华超声影像学杂志

ABSTRACT

ObjectiveTo verify the feasibility and the accuracy for the biopsy of targets not visible on sonography but shown on CT in a phantom by using real-time virtual navigation system(RVS).Methods The tissue mimicking phantom,made of gel,contained 30 red spheres which were 10 mm in diameter,randomly placed.These spheres were invisible on sonography,but visible on CT.A junior operator and a senior operator performed the biopsy respectively,and each sphere was biopsied once guide by both RVS and conventional ultrasound for each operator.The red dye in thebiopsied sample meant successful performance.The success rate of biopsy and the length of the red dyed sample were recorded.Results There was no statistically difference between the performance results of the two operators.The success rate and the median length of red dyed sample biopsy of RVS were respectively 96.7％ (58/60) and 7.5 mm (rang,6-9 mm) which were statistically higher and longer than that of conventional ultrasound,43.3％(26/60) and 0 mm(rang,0 - 5 mm) ( P ＜0.05).ConclusionsBiopsy guided by RVS for the target invisible to ultrasound is a feasible and accuracy method,which will be a new guided method for interventional ultrasound.