What do you mean by the signal that t 1w 1 shows slightly higher and t2w 1 shows?

T 1W 1 showed slightly low signal and T2W 1 showed slightly high signal, and the lesions showed uneven and obvious changes after enhancement. The lesion extends along the auditory nerve to the left internal auditory canal, the left internal auditory canal is enlarged, and the left pontine is slightly compressed, with a size of about 23 mm *19 mm.

White matter t 1w 1 high signal 2 1 13t2w 1 low signal is a kind of white matter disease, which is an ischemic focus caused by delayed degeneration of the brain after being damaged by virus, inflammation and toxicity. Need help to send magnetic resonance photos to guide, this disease should be treated quickly, otherwise it will easily lead to spastic paralysis, dementia, blindness and so on.

Extended data:

The main factors affecting the dispersion signal are B value, apparent dispersion coefficient (ADC), anisotropy, T2 penetration effect and so on.

Diffusion sensitivity coefficient (B) value: Diffusion weighted imaging (DWI) is the signal intensity imaging measured at a certain B value. With the increase of B value, the diffusion weight of image increases, and the contrast between diseased tissue and normal tissue increases, which improves the sensitivity of DWI.

Increasing the value of B will lead to the decrease of the signal-to-noise ratio of the image, because the increase of the value of B is mainly accomplished by prolonging the duration (d) of the gradient pulse and the interval (v) of the step pulse, so that the wave time (TE) increases, while the long TE attenuates the signal.

References:

Baidu encyclopedia-magnetic diffusion weighted imaging