Bronchial Morphology Measurement Using Ultra-high-resolution CT Images

Bronchial Morphology Measurement Using Ultra-high-resolution CT Images

H Moriya, MD, Fukushima, Fukushima JAPAN; M Suzuki; S Muramatsu, RT; K Hashimoto; Y Kumasaka; S Tsukagoshi, PhD; Aminco, Inc: Daisuke Suto, Amin Co Ltd: Kingo Shichinohe.

TEACHING POINTS

Ultra-high-resolution CT (UHRCT) is a CT that achieves high spatial resolution by reducing the detector size to 1/4. In the previous studies, the bronchial visualization ability was superior compared with conventional HRCT (CHRCT). Especially in the 1 mm diameter bronchioles, 1/3 by CHRCT and 80% by UHRCT were visualized. Therefore, we present the bronchial visualization and the bronchial measurement method of UHRCT.

TABLE OF CONTENTS/OUTLINE

1. UHRCT: Aquilion Precision. SHR mode, matrix: 1024, 0.25 mm thickness. 2. Bronchial visualization of UHRCT: The shape of the bronchus with an inner diameter of 0.4 mm (11th to 18th) can be delicately depicted. UHRCT has a resolution that can clearly depict the bronchi in the lobule. 3. Bronchial morphology measurement: Workstation(Ziostation2). Using the 3D path function, a bronchial path from the segmental bronchial orifice to the target tumor was created. The following items were measurable. Distance from bronchial orifice to target tumor. Area and diameter of bronchial lumen. Main branch points (distance, branch angle, diameter). Direction of segmental bronchus. Direction of bronchus near the target. Number of involved bronchi. 4.Case presentation of peripheral lung tumor: Approximately 90% of 20 mm nodules were associated with bronchi. UHRCT significantly improved mapping accuracy for transbronchial guidance.