proton density

The focus could be seen over clearly by using proton density .

质子密度加权像显示病灶更为清晰。

The use of nuclear magnetic resonance of protons to produce proton density images .

利用核磁共振产生有关质子密度的图像。

The proton density weighted imaging showed that early ischemia was cytotoxicity edema .

质子密度加权像显示早期缺血为细胞毒性水肿。

Free water as a good solvent participates in different types of biochemical reaction and therefore the increase of proton density value ( signal value ) of free water was the biggest .

自由水作为溶剂在绿豆吸水过程中参与各种生化反应，故自由水的质子密度（信号量）上升量最大。

Most extreme high level of electron flux at geostationary orbit occurred during the geomagnetic storm recovery phase with the solar wind proton density lower than 4 cm-3 and strong substorm activity .

绝大多数高通量事件都是出现在磁暴恢复相期间，且太阳风质子密度低于4个/cm3并伴有亚暴时才会发生。

T1-weighted images . proton density impes and T2-weighted images were performed in all 188 cases and T1-weighted images after intravenous injection of Gd-DTPA were performed in 49 cases .

MR成像采用自旋回波序列，所有病例作了T1加权成像、质子密度成像和T2加权成像，49例作了静脉注射Gd－DTPA后T1加权成像。

T1 and proton density weighted Images are suitable for examining the meniscal tears while the meniscal cyst and the rupture of ligaments can be shown better on T2 weighted images .

手术9例，8例符合MRI，1例假阳性。T1及质子密度像显示半月板撕裂好，T2加权像显示半月板囊肿和韧带损伤好。

T 2-and proton density weighted images often showed high-signaling of pontine transversal fibers ( 19 / 28 ) and middle cerebellar peduncles ( 12 / 28 ) .

在T2和质子密度加权像上常可见桥横纤维（19/28）和小脑中脚（12/28）高信号。

In-vitro experiments show that 0.2mL of blood in 10mL of bile could be detected as a hyperintense area on T1 - weighted image , 0.4mL of blood on proton density weighted image as a slightly hyperintense area if the blood was hot mixed with bile .

质子密度加权象可发现加于10mL，胆汁中的0.4mL血液表现为稍高信号区；

Radial evolution of the proton beam density in the solar wind

太阳风质子束流密度的径向变化

, then there isa close relation between the mean flux density S - and solar proton flux density Ip > with a correlation of 0.8 .

与太阳质子流量密度IP之间有着紧密的相关，相关系数约为0.8。