MRI Signal Measurement of Hippocampal Formation
- VernacularTitle:海马结构的磁共振信号测量
- Author:
Xucang DU
;
Zezhong WANG
;
Bolang YU
;
Huimin REN
;
Haitao HU
;
Yong LIU
- Publication Type:Journal Article
- From:
Journal of Practical Radiology
2001;17(5):336-338
- CountryChina
- Language:Chinese
-
Abstract:
Objective To define the range of the normal values of MRI signals of hippocampal formation(HPF) for the diagnosis of early stage Alzheimer's disease and hippocampal sclerosis.Methods MRI signals of 254 normal adults were measured on the transverse section.Results HPF signal intensities were:T1 relaxation times,629±73 ms;T2 relaxation times,83±5.5 ms;and proton density value,5978±651.The T2 value range(χ±2S)was 72～94 ms,and mean 83 ms.T2 value greater than 104 ms will be associated with evidence of hippocampal pathologic changes.The mixed signal intensity of T2WI(30,60,120)were:3907±407,2657±347,1288±174.The signal intensity ratios of T2WI were:1.02,1.07,1.13.Conclusion As for the histological features of temporal lobe cortex and HPF,T1relaxation times and proton density values are matched but T2 relaxation times of HPF are relatively longer.
