Combined Fluoroscopy- and CT-Guided Transthoracic Needle Biopsy Using a C-Arm Cone-Beam CT System: Comparison with Fluoroscopy-Guided Biopsy

Objective: The aim of this study was to evaluate the usefulness of combined fl uoroscopy- and CT-guided transthoracic needle biopsy (FC-TNB) using a cone beam CT system in comparison to fl uoroscopy-guided TNB (F-TNB). Materials and Methods: We retrospectively evaluated 74 FC-TNB cases (group A) and 97 F-TNB cases (group B) to compare their respective diagnostic accuracies according to the size and depth of the lesion, as well as complications, procedure time, and radiation dose. Results: The sensitivity for malignancy and diagnostic accuracy for small (< 30 mm in size) and deep (${\geq}$ 50 mm in depth) lesions were higher in group A (91% and 94%, 92% and 94%) than in group B (73% and 81%, 84% and 88%), however not statistically signifi cant (p > 0.05). Concerning lesions ${\geq}$ 30 mm in size and < 50 mm in depth, both groups displayed similar results (group A, 91% and 92%, 80% and 87%; group B, 90% and 92%, 86% and 90%). Pneumothorax occurred 26% of the time in group A and 14% for group B. The mean procedure time and patient skin dose were signifi cantly higher in group A (13.6 ${\pm}$ 4.0 minutes, 157.1 ${\pm}$ 76.5 mGy) than in group B (9.0 ${\pm}$ 3.5 minutes, 21.9 ${\pm}$ 15.2 mGy) (p < 0.05). Conclusion: Combined fl uoroscopy- and CT-guided TNB allows the biopsy of small (< 30 mm) and deep lesions (${\geq}$ 50 mm) with high diagnostic accuracy and short procedure times, whereas F-TNB is still a useful method for large and superfi cial lesions with a low radiation dose.