Mäkelä K, Hölttä V, Jääskeläinen S, Könönen M, Jousmäki V
Tampere University Hospital, Dept. of Clinical Neurophysiology, Finland.
Electroencephalogr Clin Neurophysiol. 1996 May;100(3):273-4. doi: 10.1016/0168-5597(96)00281-x.
The periodic calibration and control of electroretinographic (ERG) stimulators is often neglected due to the difficulties in accurate measurements of the stimuli. Comparison of measurements carried out in different laboratories has been very difficult, as the accurate parameters of the stimuli used usually are not known. In some cases it is assumed that if the stimulator type is known, comparisons can be carried out. We have tested the Ganzfeld flash stimulators used in the departments of clinical neurophysiology of 3 major hospitals in Finland, namely Kuopio University Hospital, Turku Central University Hospital, and Tampere University Hospital, Measurements, performed with a new type of photometer, show that the intensities varied by 42% between the highest and lowest intensity stimulators at nominally identical settings. The measurements underline the findings that identical stimulators will not necessarily produce identical stimuli. These observations also indicate that the stability of the stimuli can be improved by the proper choice of stimulator output settings.
由于难以精确测量视网膜电图（ERG）刺激器的刺激，其定期校准和控制常常被忽视。在不同实验室进行测量结果的比较非常困难，因为通常不知道所使用刺激的准确参数。在某些情况下，人们认为如果已知刺激器类型，就可以进行比较。我们测试了芬兰3家主要医院临床神经生理学部门使用的全视野闪光刺激器，即库奥皮奥大学医院、图尔库中央大学医院和坦佩雷大学医院。使用新型光度计进行的测量表明，在名义上相同的设置下，最高强度和最低强度刺激器之间的强度变化了42%。这些测量结果强调了相同的刺激器不一定会产生相同刺激的发现。这些观察结果还表明，通过适当选择刺激器输出设置，可以提高刺激的稳定性。
