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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.
扫描模式使用临床常用的颞骨螺旋扫描方式:管电压120 kV,准直宽度20×0.6 mm,视野200 mm,重建矩阵512×512,旋转时间1 s/r,重建层厚0.6 mm,重建间隔0.3 mm,分别改变管电流(380、300、200、160、120和80 mA)和螺距(0.8、1.0和1.2)进行扫描和重建,然后对颞骨进行横断面、冠状面和双斜面多平面重组,于重组后的横断层面图像上选取弓形下窝、鼓膜张肌腱、面神经隐窝、前庭导水管和锥隆起5个解剖结构,冠状面重组图像上选取盾板、横嵴、蜗窗、面神经的蛇眼征和锤骨外侧韧带5个解剖结构,双斜面重组图像上选取锤骨、砧骨、镫骨、上骨半规管和面神经管5个解剖结构,在双盲的情况下由放射学专家分别对各管电流和螺距下扫描的重组图像进行评分,随后进行统计学处理,从中筛选出满足诊断要求的最低管电流值和最大的螺距,分别采用患者25例(15耳)用该管电流值和螺距验证其可行性;然后利用模体分别测试各管电流和螺距下的图像的空间分辨率、噪声及其剂量长度积,并对测试所得参数数值进行比较和统计学处理。
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In order to control the flow separation by reducing the diffusion factor and enlarging the diameter of inner circle, the meridian plane profile of the return channel was redesigned, which is achieved by substituting arbitrary curve for the circle with no change of the axial length of the stage. Bezier curve with eight parameters was chose to describe the shape of meridian plane profile, and the optimization of the meridian plane profile was implemented combining back-propagation neural network with genetic algorithm.
改进的主要思路是减小弯道前半部分通道的扩压度,并同时加大弯道出口内侧的转弯半径,主要做法是在不增加整级轴向尺寸的前提下,用任意曲线取代传统弯道的同心圆环结构,给定弯道回流器子午型线的外侧型线,采用Bezier曲线对内侧型线的2段曲线进行参数化描述,利用遗传算法和反向传播(back-propagation,BP)神经网络相结合的方法对内侧型线进行优化,得到新的弯道回流器子午型线。
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GnRH-ir fibers distribute in the various brain region from the olfactory bulb to the cerebellum. They are especially abundant in the hypothalamus, the preoptic area and the ventral telecephalon. The immunopositive reaction in precocious fish is evidently stronger than that in unprecocious fish, and there is only very weak reaction in the gonadal undeveloped fish. The differences are most obvious in the hypothalamus, but not in other areas.
性早熟大黄鱼的神经内分泌细胞对GnRH抗血清的免疫阳性反应明显,无论在细胞的数量和免疫强度都比未早熟鱼多和强,在性腺尚未发育的幼鱼脑中仅有弱的免疫阳性,这种差异在下丘脑外侧结节核及视前核处最为明显,在其它GnRH阳性部位则差异不显著。
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They were divided into two groups. Eight of them underwent lateral retinacular overlap suture and medial retinacular release operation to create patellofemoral articular cartilage degeneration.
山羊髌股关节和胫股关节软骨退变模型的建立选用山羊16只,其中8只采用外侧支持带紧缩和内侧支持带松解的方法制造髌股关节退变的模型,另外8只采用前交叉韧带切断和内侧半月板切除的方法制造胫股关节退变的模型。
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It has been well documented that the fibular collateral ligament is the primary varus stabilizer of the knee.8,10 Consequently, isolated FCL injuries can elicit abnormal varus knee instability that can lead to functional limitations, a varus thrust gait pattern, and the potential development of medial meniscal tears or medial compartment arthritis over time due to the increased compressive forces at the medial tibiofemoral compartment.16,23,30 In addition, it has been demonstrated that varus instability, primarily due to a deficient FCL from an untreated posterolateral knee injury, causes a significant increase in force on both anterior cruciate and posterior cruciate ligament reconstruction grafts.11,21,22 Therefore, a reconstruction technique to address nonrepairable acute or chronic isolated FCL tears is important to address these pathologic abnormalities.
已经证实腓侧副韧带是防止膝关节内翻的主要稳定结构[8,10]。因此,FCL离断伤可以引起异常的膝关节内翻不稳定,从而导致功能受限、膝内摆步态和潜在发展为内侧半月板撕裂或由于在增加胫股关节间隙的压力会随时间推移发生内侧间室关节炎[16, 23, 30]。此外,已经证实了主要由膝关节后外侧损伤后未经治疗导致FCL功能缺陷引起的膝内翻不稳可以引起前交叉韧带和后交叉韧带重建移植物受力明显[11,21,22]。因此,认为不可修复的急性或慢性FCL离断撕裂伤的重建技术对这些病理异常非常重要。
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Methods 49 cases with unilateral cleft lip were repaired on modified Millard's method. These ways include: The improved type"Ⅰ"didn't make cut under the anterior naris;the distinction between the wet and dry vermilion of the lip, and the application in the operation; closed in the wound near at pyriform aperture edge by"L-flap"and"M-flap"; relaxed alae nasi and made a slack cut in the nasal cavity; flexible use for"5~x"back cut and "C-flap".
对49例先天性单侧唇裂应用改良的Millard法修复:改良Ⅰ式不在患侧鼻孔下方作切口,减少了瘢痕形成;利用患侧干燥红唇组织重建健侧唇弓部分的红唇欠缺;利用小瓣&L&、&M&连同唇颊黏膜瓣来参与闭合梨状缘附近的伤口促进愈合;松解患侧鼻翼外侧脚及鼻腔内作松弛切口重建前鼻孔;灵活掌握&5~x&的返切和&C&瓣的旋转推进方向来延长唇高。
- 推荐网络例句
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Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.
在对危险的南部地区访问时,他斥责什叶派民兵领导人对中央集权的挑衅行为。
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In fact,I've got him on the satellite mobile right now.
实际上 我们已接通卫星可视电话了
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The enrich the peopling of Deng Xiaoping of century great person thought, it is the main component in system of theory of Deng Xiaoping economy, it is a when our country economy builds basic task important facet.
世纪伟人邓小平的富民思想,是邓小平经济理论体系中的重要组成部分,是我国经济建设根本任务的一个重要方面。