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.

掃描模式使用臨床常用的顳骨螺旋掃描方式：管電壓120 kV，準(zhǔn)直寬度20×0.6 mm国产又爽又黄又湿的视频，視野200 mm欧美爱爱视频免费，重建矩陣512×512，旋轉(zhuǎn)時(shí)間1 s/r影音先锋最新AV资源网站，重建層厚0.6 mm99超碰在线公开视，重建間隔0.3 mm，分別改變管電流(380人人操人操人人人操人操人人人操、300欧洲老妇人与异性性交、200、160谁知道A片网址、120和80 mA)和螺距(0.8国产999精品自拍、1.0和1.2)進(jìn)行掃描和重建，然后對顳骨進(jìn)行橫斷面18禁片免费黄色网站在线播放、冠狀面和雙斜面多平面重組亚洲另类三级理论，于重組后的橫斷層面圖像上選取弓形下窩、鼓膜張肌腱18黄男人女人色www、面神經(jīng)隱窩在线观看xxxx、前庭導(dǎo)水管和錐隆起5個(gè)解剖結(jié)構(gòu)，冠狀面重組圖像上選取盾板日本a网址、橫嵴欧美一区二区日日屄、蝸窗、面神經(jīng)的蛇眼征和錘骨外側(cè)韌帶5個(gè)解剖結(jié)構(gòu)欧美在线精品视频第九页，雙斜面重組圖像上選取錘骨一级性精品视频、砧骨、鐙骨亚洲一级高清在线大黄毛片、上骨半規(guī)管和面神經(jīng)管5個(gè)解剖結(jié)構(gòu)欧美性交大全，在雙盲的情況下由放射學(xué)專家分別對各管電流和螺距下掃描的重組圖像進(jìn)行評分，隨后進(jìn)行統(tǒng)計(jì)學(xué)處理能免费观看的AV网站，從中篩選出滿足診斷要求的最低管電流值和最大的螺距欧美丰满性生活熟妇，分別采用患者25例(15耳)用該管電流值和螺距驗(yàn)證其可行性；然后利用模體分別測試各管電流和螺距下的圖像的空間分辨率一级一级一级一级片、噪聲及其劑量長度積欧美大黑屌视频，并對測試所得參數(shù)數(shù)值進(jìn)行比較和統(tǒng)計(jì)學(xué)處理。