mean transit time

Mean transit time was ( 17.60 ± 4.52 ) s.

平均通过时间为（1760±452）s。

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

高肺容积部分平均通过时间的测定方法和临床意义

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

血浆至脑脊液平均通过时间（MTT）0.3h；

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

用力呼气肺量图平均通过时间&300例测定结果分析

Results Mean transit time and the distribution volume of the compartment can affect the shape of the time intensity curve at the same dosage .

结果显示在同一剂量下，不同部位的时间-强度曲线是有变化的。

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

脑灌注MR包括局部脑血容量图（rCBV）和平均通过时间图（MTT）。

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

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

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 .

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；

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 .

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。

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 .

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）。

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

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。

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

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；

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 .

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。

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

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）。

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 .

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。

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 .

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）。

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 ) .

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。

The mean transit time ( or the relative transit resistance ) and the proportion of pore clogging cells are found to be appropriate for representing the average deformability and the clogging characteristic of RBCs respectively .

认为红细胞平均过孔时间（或相对过孔阻力）和堵孔红细胞比例分别用于表达红细胞平均变形性和堵孔特性比较合适。

Brain perfusion imaging showing the regional cerebral blood flow and regional cerebral blood volume in frontal lobes were obviously decreasing ( P < 0.01 ) and there was no significant variation of mean transit time ( MTT ) .

脑CT灌注成像显示双额叶局部脑血流量、脑血容量明显下降（P<0.01）。