Methods: A 3-D coordinate system was designed for skull, based on Frankfurt horizontal plane and analytical geometry method.

以顱骨的耳眼平面為基礎(chǔ)定位平面国产真实迷奸系列，按解析幾何方法設(shè)計(jì)顱骨的三維空間坐標(biāo)系国产13页。

The raw data was processed by using axial, coronal and double oblique multi-planar reformation; Images obtained were graded in terms of quality with a 5-point scale(5=excellent, 4=good, 3=fair, 2=poor, and 1=nondiagnostic). In grading image quality at axial MPR, The radiologic specialists focused on the subarcuate fossa, tendon of tensor tympani, facial recess, vestibular aqueduct and pyramidal eminence, In grading image quality at coronal MPR, attention was given to the scute, crista transversa, fenestra cochleae, lateral malleal ligament and snake eyes signature of cranial nerve, In the grading of the image quality at double oblique MPR, the radiologic specialists concentrated on the malleus, incus, stirrup bone, upper bony semicircular and aquaeductus fallopii, and then to implement statistical analysis. In order to choose the minimum tube current values and the maximum pitch that can satisfy the diagnosis request, image quality of axial, coronal and double oblique reformation images was compared with different tube current groups. 15 ears of volunteers were used to test the validity with the scanning parameter. Subsequently noise, MTF and dose length product were measured by phantoms in different tube current and pitch, the parameters obtained were compared and taken into statistics analysis.

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FH.Frankfort horizontal plane：眼耳平面

fenestration 開窗 | FH.Frankfort horizontal plane 眼耳平面 | finger sucking 吮其他指

finger sucking：吮其他指

FH.Frankfort horizontal plane 眼耳平面 | finger sucking 吮其他指 | first order bend 第一序列彎曲

FMD Foot-and-Mouth Disease：口蹄病

FMA Frankfort-mandibular plane angle 眼耳平面-下頜平面角 | FMD foot-and-mouth disease 口蹄病 | FME full-mouth extraction 全口牙拔除

facial angle：面角

3.面角(Facial angle) 指眼耳平面與面平面(NaPo)之間的下后交角. 該角反映了頦部相對(duì)于面部其他部分的前后位置. 恒牙初期的正常均值和標(biāo)準(zhǔn)差分別為86.4和2.9°,恒牙期為87.8和4.2°. 面角增加,表明頦前突. 反之,減少反映了頦后縮.