拍摄眼底荧光血管造影的新模式

A new model for filming fundus fluorescein angiography

目的:改进数码改装的传统胶片眼底血管造影机的使用方法,使造影能在正常光线下进行,并能快速对焦,得到清晰的图片。同时使医生工作更轻松,患者配合更容易。方法:传统的胶片眼底血管造影机经过数码改装,普遍应用于临床。这些造影机存在CCD对焦困难,清晰度稍差;对焦点用指示点在照片上成像;没有零时刻,需要照一张照片进行计算;照相机快门时间较长等缺点。我们对这种造影机的使用方法予以改进,包括根据照明光在角膜上的反光确定相机前后位置;根据患者眼球位置确定图像位置,参考CCD上的瞬时图像;将微调旋钮加上刻度,正视眼为零;开始造影注药的同时拍零时刻照片。提前3s按下快门,减少等待时间。结果:我们可以在正常光线下就可以做造影,彩色照片时调节好微调旋钮,造影过程中不需要再进行调节。最后照得的照片清楚,对焦点简单,患者配合良好。结论:角膜反光对焦结合设定微调旋钮刻度的方法有较强的实用性,可供广大基层医生借鉴。基层医院医生要学会充分利用现有条件加以利用。

AIM：To improve the usage of digital-modified fundus angiography with traditional film for fast focusing and clear pictures with normal light.METHODS：The modified fundus angiography with traditional film was widely used in clinical application,but it had the following defects：it＇s difficult to focus on CCD and result in poor clarity;imaging is focused by measured point;a photograph is needed for calculation because of no zero point;time of camera shutter is a little long,and etc.We modified the usage of this kind of imaging machine including：camera＇s position is determined according to the reflection of illuminate light on cornea;the image position is based on eye position and refer to the instantaneous image on CCD;the fine-tuning knob is equipped with scale;photos are taken as soon as injection started,and shutter is pressed 3 seconds ahead for reducing waiting time.RESULTS：FFA can be finished under normal light,and the imaging process does not require further adjustment after regulation of fine-adjustment knob.The quality of photos is quite good as well as patient compliance.CONCLUSION：It is effective to do FFA by corneal reflex focusing and scales on fine-tuning knob.Doctors in primary hospital should learn to take full use of the current conditions during daily work.