Accuracy of Biopsy needle in Computed Tomography Guided Biopsy Using a Self-Made Gelatin Phantom

Abstract

The purpose of this study was to analyze the actual reflection of the biopsy needle when performing computed tomography (CT) guided biopsy in lung cancer. CT used in the experiment was a 128-channel dual source SOMATOM Definition flash. A 21-gauge biopsy needle was inserted into the self-made gelatin phantom at 10 mm intervals from 20 mm to 80 mm on the Y -axis of the CT scanner. At each insertion depth, the CT axial scan was performed with 0.6 mm, 1.0 mm, and 2.0 mm slice thickness. We examined 30 times for each slice thickness for a total of 270 times. These acquired images were used to compare actual and measured insertion lengths. As a result, 40 mm depth was measured as 4.00 ± 0.01 in 1.0 mm slice thickness (p > 0.05) while the remaining slice thickness was considered smaller or larger than the actual value. A 1.0 mm slice thickness was closer to the actual measurement value than the other two slice thicknesses (p < 0.05). Therefore, the accuracy of CT-guided biopsy in lung cancer is increased by positioning the lesion at the isocenter at a slice thickness of 1.0 mm.