Computer Sciences Group, University of Applied Sciences, Darmstadt, Germany.
Invest Ophthalmol Vis Sci. 2011 Jun 1;52(6):3713-22. doi: 10.1167/iovs.10-6706.
To evaluate ablation algorithms and temperature changes in laser refractive surgery.
The model (virtual laser system [VLS]) simulates different physical effects of an entire surgical process, simulating the shot-by-shot ablation process based on a modeled beam profile. The model is comprehensive and directly considers applied correction; corneal geometry, including astigmatism; laser beam characteristics; and ablative spot properties.
Pulse lists collected from actual treatments were used to simulate the temperature increase during the ablation process. Ablation efficiency reduction in the periphery resulted in a lower peripheral temperature increase. Steep corneas had lesser temperature increases than flat ones. The maximum rise in temperature depends on the spatial density of the ablation pulses. For the same number of ablative pulses, myopic corrections showed the highest temperature increase, followed by myopic astigmatism, mixed astigmatism, phototherapeutic keratectomy (PTK), hyperopic astigmatism, and hyperopic treatments.
The proposed model can be used, at relatively low cost, for calibration, verification, and validation of the laser systems used for ablation processes and would directly improve the quality of the results.
评估激光屈光手术中的消融算法和温度变化。
该模型（虚拟激光系统[VLS]）模拟整个手术过程的不同物理效应，基于模拟的光束轮廓模拟逐点消融过程。该模型全面且直接考虑了应用的校正；角膜几何形状，包括散光；激光束特性；和消融斑特性。
从实际治疗中收集的脉冲列表用于模拟消融过程中的温度升高。在边缘处的消融效率降低导致边缘温度升高降低。陡峭的角膜比平坦的角膜温度升高较小。最大温升取决于消融脉冲的空间密度。对于相同数量的消融脉冲，近视矫正显示出最高的温度升高，其次是近视散光、混合散光、光动力角膜切削术（PTK）、远视散光和远视治疗。
所提出的模型可以以相对较低的成本用于校准、验证和验证用于消融过程的激光系统，并且将直接提高结果的质量。
