ASA曝光指数∶由美国国家标准学会规定，标明胶片对光的敏感程度的指数或感光速度。
ASA Exposure: Index or speed rating that denotes the film sensitivity, defined by the American National Standards Institution.
本系统仍以中国人骨发育评价标准（CHN积分法）为依据，采用数字化成像替代传统的X光胶片。
This system is still based on The Standard of Estimating Skeletal Maturity for Chinese (Method of CHN Scoring), uses the digitized' image substitution tradion X light film.
此类技巧没有既定标准，每一张胶片的反应都不同。
There is no set standards for these types of techniques and every film reacts differently.
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