Objective To make sure the obstructive changes in patients with obstructive sleep apnea hypopnea syndrome(OSAHS) before and when they wear the snore guard by DR dual-energy subtraction technique.

• 目的通过DR双能量减影技术,确定阻塞性睡眠呼吸暂停低通气综合征(OSAHS)患者在戴用阻鼾器前和戴用时阻塞部位的变化。