• Joo Yeon Cheung, Yookyung Kim, Sung Shine Shim, Jin Hwa Lee, Jung Hyun Chang, Yon Ju Ryu, and Rena J Lee.
• Department of Radiology, School of Medicine, Ewha Womans University, 911-1, Mokdong, Yancheon-gu, Seoul 158-710, Republic of Korea.
• Eur J Radiol. 2012 May 1; 81 (5): 1045-9.

AimTo evaluate the accuracy of depth measurements on supine chest computed tomography (CT) for transthoracic needle biopsy (TNB).Materials And MethodsWe measured skin-lesion depths from the skin surface to nodules on both prebiopsy supine CT scans and CT scans obtained during cone beam CT-guided TNB in the supine (n=29) or prone (n=40) position in 69 patients, and analyzed the differences between the two measurements, based on patient position for the biopsy and lesion location.ResultsSkin-lesion depths measured on prebiopsy supine CT scans were significantly larger than those measured on CT scans obtained during TNB in the prone position (p<0.001; mean difference±standard deviation (SD), 6.2 ± 5.7 mm; range, 0-18 mm), but the differences showed marginal significance in the supine position (p=0.051; 3.5 ± 3.9 mm; 0-13 mm). Additionally, the differences were significantly larger for the upper (mean±SD, 7.8 ± 5.7 mm) and middle (10.1 ± 6.5mm) lung zones than for the lower lung zones (3.1 ± 3.3mm) in the prone position (p=0.011), and were larger for the upper lung zone (4.6 ± 5.0mm) than for the middle (2.4 ± 2.0mm) and lower (2.3 ± 2.3mm) lung zones in the supine position (p=0.004).ConclusionsSkin-lesion depths measured on prebiopsy supine chest CT scans were inaccurate for TNB in the prone position, particularly for nodules in the upper and middle lung zones.Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.

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