平均通过时间

恶性肿块的灌注值、峰值高、峰值高比值和平均通过时间均明显大于良性肿块（P<0.01），此四个参数间呈两两正相关；

PV , PE , RATIO and MTT of malignant masses were significantly higher than those of benign masses ( P < 0.01 ), the four parameters were correlated with each other significantly .

而CT脑容积灌注成像发现与临床症状相对应的灌注减低区，表现为脑血流量及脑血容量减低、平均通过时间延迟；

However , abnormal perfusion changes in accordance with clinical symptoms were found . Cerebral blood flow and cerebral blood volume were decreased , and mean transit time was delayed .

脑灌注成像（PWI）显示平均通过时间（MeanTransitTime，MTT）延长0.5~15s。

Perfusion-weighted imaging revealed MTT ( mean transit time ) was extend 0.5s to 15s .

通过包括肝灌注指数，造影剂平均通过时间和渗透表面积乘积等三个灌注CT的参数在对照组，研究组及其亚组进行了比较。

Three perfusion CT parameters of hepatic perfusion index ( HPI ), mean transit time ( MTT ) and permeability-surface area product ( PS ) were compared among controls , patients and subgroups .

脑灌注MR包括局部脑血容量图（rCBV）和平均通过时间图（MTT）。

Qualitative perfusion maps were calculated for regional cerebral blood volume ( rCBV ) and mean transit time ( MTT ) .

结果正常胰腺CT灌注成像特征表现为局部组织血流量（BF）、血容量（BV）、毛细血管表面通透性（PS）和造影剂平均通过时间（MTT）均匀一致的实质性器官。

Results The characteristic of normal pancreatic CT perfusion imaging showing the whole pancreas is displayed as an organ with symmetrical BF , BV , MTT and PS.

血浆至脑脊液平均通过时间（MTT）0.3h；

Plasma to CSF mean transit time ( MTT ) 0 . 3h ;

计算出感兴趣区对比剂首过期末的信号下降百分率，作出对比剂平均通过时间（MTT）图，得出MTT值，计算出微血管相对渗透值（rP）。

The signal reduction ratio and mean transit time ( MTT ), which was obtained from MTT map , were used to calculate the relative permeability ( rP ) of microvessel .

结果（1）肝硬化患者的肝动脉灌注量（HAP）、门静脉灌注量（PVP）和总肝血流量（THBF）均较正常组降低，平均通过时间（MTT）较正常组延长。

Results ( 1 ) Hepatic artery perfusion , portal venous perfusion , total hepatic perfusion , hepatic perfusion index and mean transit time were decreased significantly compared with control group .

得到相对局部脑血容量（rCBV）图和对比剂平均通过时间（MTT）图，计算病灶rCBV和MTT比率。

Maps of relative regional blood volume ( rCBV ) and mean transit time ( MTT ) were obtained . The ratios of rCBV and MTT of lesions were analyzed .

术后1h，病变表现为局部脑血容量（rCBV）轻度增加，局部脑血流量（rCBF）轻度降低，平均通过时间（MTT）稍延长；

Regional cerebral blood volume ( rCBV ) increased , regional cerebral blood flow ( rCBF ) decreased and mean transit time ( MTT ) prolonged slightly in the lesions after 1h .

测量每一例患者的肝血流量（HBF）、肝血容量（HBV）、平均通过时间（MTT）、毛细血管通透性（PS）和肝动脉灌注指数（HPI）。

The perfusion parameters included hepatic blood flow ( HBF ), hepatic blood volume ( HBV ), mean transit time ( MTT ), permeability surface ( PS ) and hepatic perfusion index ( HPI ) .

灌注CT可计算出脑血流量（CBF）、脑血容量（CBV）、平均通过时间（MTT）、峰值时间（TTP）等四种参数图。

Four parameters were calculated by perfusion CT , such as cerebral blood flow ( CBF ), cerebral blood volume ( CBV ) , mean transit time ( MTT ) , time to peak ( TTP ) .

方法39例经手术和病理证实的脑膜瘤患者，术前行PWI检查，计算并比较各型脑膜瘤的相对局部脑血流容积（rrCBV）和相对平均通过时间（rMTT）。

Methods MR perfusion weighted imaging was performed on 39 patients with pathologically proved meningioma . The relative regional cerebral blood volume ( rrCBV ) and relative mean transit time ( rMTT ) were calculated .

病变部位及对侧的局部脑血容量、局部脑血流量、对比剂平均通过时间、达峰时间的测定，左侧皮质脊髓束及Broca区与Wernicke区之间的联系纤维数量与对侧相应区域的比较。

Detection of regional cerebral blood volume , regional cerebral blood flow , average pass time and peak time of the contrast medium in lesion area and the contralateral area ; Comparison of the amount of connecting fibers between left corticospinal tract and left Broca and Wernicke areas .

平均通过时间为（1760±452）s。

Mean transit time was ( 17.60 ± 4.52 ) s.

用力呼气肺量图平均通过时间&300例测定结果分析

The mean transit time in forced expiratory spirogram & a study in 300 subjects

用简易计算法对628例正常儿童青少年部分平均通过时间的测定

Determination of MMTp in 628 Normal Children and Adolescents with " Convenient Calculation "

高肺容积部分平均通过时间的测定方法和临床意义

Determination of the partial mean transit time of high lung volumes and its clinical evaluation

20例哮喘病人用力呼气肺量图部分平均通过时间的测定

Determination of the Partial Mean Transit Timp ( MTTp ) of Forced Expiratory Spirogram in 20 Asthmatics

而路况信息一般用路段平均通过时间和平均速度来表示。

It is usually expressed by average speed and average travel time of the vehicles on the road .

利用磁共振灌注成像进行局部脑血容量、局部脑血流量、对比剂平均通过时间、达峰时间的测定；

Magnetic resonance perfusion imaging was carried out to detect regional cerebral blood volume , regional cerebral blood flow , average pass time and peak time of the contrast medium ;

表观弥散系数、脑血流、脑血容量及平均通过时间是预测缺血灶结果的参数。

ADC values , cerebral blood volume ( CBV ), cerebral blood flow ( CBF ) and mean transition time ( MTT ) are parameters potential for predicting clinical outcome in acute ischemic patients .

门静脉阻断即刻移植瘤体组、瘤体移植3周后门静脉阻断组肝血流量、血容量、平均通过时间和血管表面通透性值均较相应对照组降低，但肝动脉灌注分数值均明显增高。

Values of blood flow of liver , blood volume , mean transit time and permeability of vascular surface were lower in immediate group and 3-week group than those in control groups , but values of HAI were increased .

离散master方程描写的系统的平均第一通过时间

The mean first-time of system described by discrete master equation

本文把Weiss等发展的计算平均第一通过时间（简称MFPT）的新方法推广到由非马尔科夫多值噪声驱动的过程。

The method for the calculation of the mean first-passage time ( MFPT ) developed by Weiss and others is generalized to a situation where the process is driven by non-Markovian multivalued noise .

本文运用随机轨道技术，解决了一般非线性双态噪声的平均第一通过时间（简称为MFPT）问题。

A statistical method for the boundary process has been used to study the mean first-passage time ( MFPT ) for systems driven by non-Markovian and nonlinear dichotomous noise .

讨论了在关联噪声驱动下双稳系统的瞬变性质，计算了该系统的平均第一通过时间（MFPT）。

The transient properties of a bistable system with correlations among additive and multiplicative noise terms are investigated . The expressions of the mean first passage time ( MFPT ) are obtained .

推导了平均第一通过时间（MFPT）方程，并在弱噪声和短相关近似下，得出方程的解；通过数值分析阐明了平均第一通过时间和噪声关联时间之间的联系。

With the aid of the projective operator technique , an integro-differential equation for the porbability density and an approximate equation for the mean first-passage time ( MFPT ) have been derived .

非马尔科夫多值噪声驱动下系统的平均第一通过时间

The Mean First-Passage Time of a System Driven by Non-Markovian Multivalued Noise