高信号

腰椎间盘MRI高信号区中的炎性细胞的表达

CD68 Immunoreactive Cells in High Intensity Zone on MRI within Annulus Fibrosus of Lumbar Discs

肝脏T1加权MRI出现节段性高信号的意义

Segmental high intensity on T1-weighted hepatic MR images

目的：探讨腰椎间盘MRI高信号区与椎间盘源性下背痛的相关性。

Objective : To explore the relationship between lumbar disc high signal area in MRI and lumbar intervertebral low back pain .

下腰痛患者MRI纤维环高信号区的病理特点及其临床意义

Pathological characteristics of high-intensity zone in lumbar disc annulus fibrosus on MRI and its clinical significance in patients of low back pain

骨髓内T1高信号脂肪影被肿瘤信号代替；

High signal intensity of marrow was replaced by tumor ;

MRI显示颈椎病伴脊髓高信号征像的临床意义及退变性脊柱疾病临床观念探讨

Clinical significance of high signal of spinal cord in MRI of patients with cervical spondylosis and investigation of the clinical concept of degenerative spinal diseases

MCAO后随时间延长，DWI上异常高信号区逐渐增大。

After MCAO , abnormal signal area enlarged with the time delay .

磁共振FLAIR序列柔脑膜高信号对烟雾病的诊断价值

The Value of Leptomeningeal High Signal Intensities on Flair Sequence to Moyamoya Disease

4例信号稍不均匀，T1WI呈等、稍低信号，T2呈高信号。

Cases had slightly uneven intensity showing iso-or slightly low intensity on T1WI .

全部患者均有T1加权像垂体后叶高信号的消失。

In all five patients , the posterior pituitary gland ( bright spot ) disappeared on T1-weighted MRI images .

在本例，两者在T1序列上显示高信号提示脂性成分。

In this case , the very high signal in both lesions on the T1-weighted images suggests fat content .

MRT2加权成像显示胆囊壁增厚点状高信号的意义

Gallbladder wall thickening : significance of hyperintense spots visualized on T_2-weighted MR imaging

副神经节瘤是富血供、明显强化的病变，T1低信号，T2高信号并多发的流空信号。

Paragangliomas are characteristically vascular , intensely enhancing lesions that demonstrate low T1 and high T2 signal with multiple flow voids .

信号异常在EPI上表现为条状低信号，GRE上略呈高信号。

Abnormal stripe low - signal on EPI and slight high - signal on GRE were demonstrated .

T2WI像上椎弓根膨大且可见高信号；

Pedicle expansion and high signal intensity in T 2WI ;

结果：MRI表现，肌肉损伤后在T1WI表现高信号影，可维持40d以上；

Results : The injured muscls showed high signal of T1WI and were kept more than 40 days .

周边的肉芽组织，由于炎性的富血供和血管通透性的增高，导致在T2序列上显示为明显的高信号。

The surrounding granulation tissue , with its inflammatory hypervascularity and increased vascular permeability , will be markedly hyperintense on T2-weighted images .

假设高信号使能，计数器每个时钟周期进行计数，PWM输出的频率为时钟频率的2次幂分频。

Suppose that Enable is high , the counter counts up every clock cycle , and the frequency of the PWM output is the clock frequency divided by2 count bits .

MRI表现：2例显示髓腔内斑片状T1WI稍低信号，T2WI均呈稍高信号，边界清晰；

MRI findings : 2 apeared as well-defined lesions with low signal intensity on T1WI and high signal intensity on T2WI ;

MRI平扫，T1WI呈等信号，T2WI呈稍高信号，增强扫描大部分呈均匀强化。

MRI scan suggested uniform T1WI signal , and slight increase in T2WI signal , and enhanced scan suggested even enhancement .

眼部脉络膜黑色素瘤在T1WI为高信号，T2WI为低信号；

Choroidal melanomas in eye showed high signal in T1WI and low signal in T2WI .

这种MRI脊髓内T2加权高信号影像可能是由于脊髓减压后，脊髓内血流急速再灌注而引起的；这种血流的急速再灌注，可能造成了脊髓灰质的某种损害而出现了节段性运动功能障碍。

This kind of T2 high signal may be due to the rapid reperfusion after decompression of spinal cord which may cause some kind of impairment of spinal cord .

在T2加权像上，梗塞灶也呈高信号。此层面损害区域同样呈带状。

The infarct also has high signal on the T2 - weighted images . This slice also demonstrates the ribbon-like geometry of the lesion .

在SE序列上骨挫伤表现为T1加权不规则低信号和T2加权高信号，STIR显影更为清晰。

With SE sequence , the signal of bone contusion was irregular on T_1 , and high on T_2 , which was more clear on STIR sequence .

结论低场MRI的T2WI呈稍高信号是其表现特点，其诊断价值与中、高场强MRI无明显差异。

Conclusion The characteristic appearance is higher signal in low field MRI T2WI.It is no diagnosis differences among the low , middle and high field MRI .

DWI上高信号的范围与局部脑血容量（CBV）的缺损程度间有相关关系；

The areas of high signal on DWI were correlated with the degrees of perfusion deficits on CBV maps .

T2WI脊髓受压部位出现高信号者18例，其中16例DWI相应部位均表现为ADC值增高，2例表现为ADC值略减低；

There were 18 cases showed hyper-intensity on T_2WI , while 16 cases showed increased ADC value in the region of spinal cord compression .

结果：①3例脊髓亚急性联合变性患者脊髓MRI的特点：病例1中下胸髓后索区对称性长T2高信号；

RESULTS : ① MRI features of SCD patients : For case 1 , there was symmetrical long T2 high signal in the posterior funiculus of middle and lower chest marrow ;

全部病例在T2WI上脑白质内均有弥漫性高信号病灶。

There were abnormal diffuse high signals in the white matter on T_2WI in all cases .

结论MR神经成像术对臂丛节后神经的显示率及对比噪声比明显高于常规成像序列，使臂丛节后神经显示成为高信号，可作为显示臂丛病变的常规方法。

Conclusion Display rate and contrast-noise ratio of images on MRN were higher than the other two sequences , MRN can show nerves clearly and make nerve bright on this sequence , it should be the routine sequence of brachial plexus lesion .