CAJ | 학술논문

目的观察并探讨核磁共振成像(MRI)用于硅油填充眼眼球视轴测量的可行性及其优缺点.方法 32例32只硅油填充眼纳入本研究.采用MRI横断面T1加权像(T1 WI)、T2加权像(T2WI)检测硅油前后间隙,以脂肪抑制后T2WI成像测量眼球视轴;以角膜顶点至黄斑中心凹距离作为视轴长度,此连线上测量硅油后间隙的厚度.A型超声采取坐位及仰卧位检查,坐位测量眼球视轴长度,改变超声传播速度以修正眼球视轴长度;仰卧位检测硅油后间隙.结果 MRI检测结果显示,硅油在T1WI像中信号较对侧玻璃体高,T2WI像中信号较玻璃体低,加脂肪抑制后硅油信号降低,化学位移伪影减少;受检眼玻璃体腔内均存在不同程度的硅油前后间隙,玻璃体后间隙厚度为(2.47±1.31)mm.A型超声检测结果显示,18只眼可检测到硅油后间隙,占56.25%.MRI、A型超声测量本组患者硅油填充眼视轴长度分别为(23.52±4.67)、(20.57±5.32)mm,两者比较,其差异有统计学意义(t=30.17,P＜0.05).结论 MRI能够用于硅油填充眼视轴测量,并对硅油前后间隙进行观察和测量.
목적 관찰병탐토핵자공진성상(MRI)용우규유전충안안구시축측량적가행성급기우결점.방법 32례32지규유전충안납입본연구.채용MRI횡단면T1가권상(T1 WI)、T2가권상(T2WI)검측규유전후간극,이지방억제후T2WI성상측량안구시축;이각막정점지황반중심요거리작위시축장도,차련선상측량규유후간극적후도.A형초성채취좌위급앙와위검사,좌위측량안구시축장도,개변초성전파속도이수정안구시축장도;앙와위검측규유후간극.결과 MRI검측결과현시,규유재T1WI상중신호교대측파리체고,T2WI상중신호교파리체저,가지방억제후규유신호강저,화학위이위영감소;수검안파리체강내균존재불동정도적규유전후간극,파리체후간극후도위(2.47±1.31)mm.A형초성검측결과현시,18지안가검측도규유후간극,점56.25%.MRI、A형초성측량본조환자규유전충안시축장도분별위(23.52±4.67)、(20.57±5.32)mm,량자비교,기차이유통계학의의(t=30.17,P＜0.05).결론 MRI능구용우규유전충안시축측량,병대규유전후간극진행관찰화측량.
Objective To investigate the feasibility of using magnetic resonance imaging (MRI) to measure the visual axis length in silicone oil filled eyeballs. Methods Thirty-two silicone oil-filled eyes of 32 patients were studied. The ante-silicone oil spaces (ASS) and retro-silicone oil spaces (RSS) on the visual axis was measured on the cross-sectional T1 weighted images (T1 WI) and T2WI, the length of the visual axis was measured on the fat-suppressed T2WI. The length of the visual axis was the distance from the corneal vertex to the macular foves, and it was also measured by A-mode ultrasound in sitting position with different ultrasonic velocity. The post-oil gap was also measured by A-mode ultrasound in supine position.Results Compared with the signal of the contralateral vitreous body, the silicone oil signal was higher on T1WI images, lower on T2WI images. After fat suppression, the silicone oil signal and chemical shift artifact were reduced. There were different levels of ASS and RSS in the vitreous cavity of all 32 cases, the RSS depth was (2. 47 ± 1.31) mm on average by MRI. However, RSS was detected in only 56.25%(18 cases) eyeballs by A-mode ultrasound. The visual axis length of silicone oil-filled eyes was (23.52 ±4.67) mm by MRI, and (20. 57±5.32) mm by A-mode ultrasound in sitting position. The differences between two measurements was statistically significant (t= 30. 17, P＜0. 05). Conclusions In addition to A-mode ultrasound, MRI might be another effective method to detect RSS and ASS, and to measure the axial length of silicone oil-filled eyes.