Keywords:
Lung, Digital radiography, Diagnostic procedure, Technology assessment, Cancer, Chronic obstructive airways disease
Authors:
N. Hashimoto1, H. Machida1, K. Yamashita1, T. NAKAI1, J. Yamaguchi1, J. Shudo1, A. Nakanishi1, H. Takeuchi2, K. Yokoyama1; 16-20-2 Shinkawa, Mitaka-shi, Tokyo/JP, 23-1-24 Matsuyama, Kiyose-shi, Tokyo/JP
DOI:
10.26044/ecr2021/C-11291
Purpose
Dynamic Chest Radiography (DCR) system has been clinically introduced since November 2018. DCR system consists of a conventional radiography system (RadSpeed Pro; Shimadzu, Kyoto, Japan), a flat-panel detector (FPD) (AeroDr fine; Konica Minolta, Tokyo, Japan), and a dedicated imaging workstation for DCR (DI-X1, Konica Minolta). This DCR system, which can achieve a short examination time for optimal productivity, can provide time-resolved radiographs (the maximum acquisition duration: 20 seconds [sec]) with a high frame rate (15 frames/sec) and a wide field of view (17 inches x 17 inches), which can be displayed in a “cine-loop” mode (Figure 1) [1]. The DCR image analysis allows quantitative evaluation of diaphragmatic movement with Diaphragm Motion Tracking (Figure 2) and semi-quantitative evaluation of pulmonary perfusion with Perfusion-weighted Image (Figure 3) and pulmonary ventilation with Ventilation-weighted Image (Figure 4) based on temporal signal value changes using the imaging workstation. Recent studies have reported the clinical utility of DCR in improved detection of lung nodules, preoperative assessment of pleural adhesion/invasion, assessment of the expiratory central airway collapse, assessment of respiratory kinetics/pulmonary function based on diaphragm excursion, and so forth [2-4]. However, the utility is susceptible to pulse width, the only adjustable acquisition parameter with this system.
The aim of the present study was to investigate influence of the pulse width on blurring and ghost artifact, visibility of pulmonary nodules, and measurement of diaphragmatic movement on DCR.