Resolution of pulmonary multiplanar reconstruction images from 0.5-mm theoretical isotropic data: a fundamental study using an inflated and fixed lung specimen.

The aim of the present study was to define the resolution of multiplanar reconstruction (MPR) of the lung from &#34;theoretical isotropic data.&#34; Using inflated and fixed lung specimens of the pig placed in the chest wall phantom, 0.5-mm isotropic data were obtained with 2 different helical pitches: 1:7 (high-quality mode) or 1:13, (high-speed mode), and 2 different tube currents: 250 mAs (high-tube-current mode) or 100 mAs (low-tube-current mode), with or without overlapping reconstruction. MPRs were created from these axial data. The diameter of the smallest visible pulmonary artery and bronchi of these CT images were measured on the corresponding slices of the specimen. The high-speed and low-tube-current mode significantly degraded the image quality due to increased noise. The smallest visible pulmonary artery and bronchus resolved on MPRs from axial-spiral data with 0.5-mm collimation were approximately 100 micrometer and 1,000 micrometer in diameter, respectively. In conclusion, helical pitch and tube current influence the resolution of MPR of the lung.</p

Investigation for the development of the method of evaluating regional lung function in the upright position using vertically opened MR system.

科学研究費補助金研究成果報告書研究種目: 基盤研究(B)研究期間: 2001～2002課題番号: 13470182研究代表者: 村田 喜代史（滋賀医科大学・医学部・教授）研究分担者: 高橋 雅士（滋賀医科大学・医学部・助教授）研究分担者: 井藤 隆太（滋賀医科大学・医学部・講師）研究分担者: 高櫻 竜太郎（滋賀医科大学・医学部・助手