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Fig. 1A. —78-year-old woman with adenocarcinoma in right upper lobe diagnosed at conventional CT-guided biopsy (conventional method). CT images were obtained with radiopaque grid. Puncture point was determined after measuring distance from skin surface to pleura (distance between a and b), needle path length (distance between b and c), and smallest angle between pleura and needle () on cathode-ray tube monitor of imager.

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