The two basic types of MRI images are T1-weighted and T2-weighted images, often referred to as T1 and T2 images. On T1 images FAT is white. On T2 images both FAT and WATER are white.

T2*-weighted imaging is an MRI sequence to quantify observable or effective T2 (T2* or " T2-star "). In this sequence, hemorrhages and hemosiderin deposits become hypointense. [2]

Flair全称是磁共振成像液体衰减反转序列，也称水抑制成像技术，它在T2中能抑制脑脊液的高信号（使脑脊液变暗），从而让邻近脑脊液的病灶显示清楚（变亮）。结合下图可得出， Flair序列 与T2序列相比，能很好的表现肿瘤部位周遭情况，清晰的表现出浮肿区域。

2024年2月23日 · T2 weighted image (T2WI) is one of the basic pulse sequences on MRI. The sequence weighting highlights differences on the T2 relaxation time of tissues. A T2WI relies upon the transverse relaxation (also known as "spin-spin" relaxation) of the net magnetization vector (NMV). T2 weighting tends to require long TE and TR times.

核磁共振 有三种成像方式T1WI(T1 Weighted Image)、T2WI(T2 Weighted Image)和PDWI(Proton Density Weighted Image) 那么这一篇就写写这三种成像方式。 为什么需要不同的成像方式呢？

T2* (T2 star) MRI is a specialized magnetic resonance imaging (MRI) technique that capitalizes on the T2* relaxation time. This relaxation time measures how quickly the magnetization of protons decays due to magnetic field inhomogeneities and magnetic susceptibility differences within …

2021年6月9日 · Flair全称是磁共振成像液体衰减反转序列，也称水抑制成像技术，它在T2中能抑制脑脊液的高信号（使脑脊液变暗），从而让邻近脑脊液的病灶显示清楚（变亮）。结合下图可得出，Flair序列与T2序列相比，能很好的表现肿瘤部位周遭情况，清晰的表现出浮肿区域。

2019年11月17日 · 与t1和t2加权图像不同，质子密度（pd）不会显示氢核的磁性，但是会显示成像区域中的核数。 为了获得PD加权图像，我们希望最小化T1和T2对比度的贡献。

T2* can be considered an "observed" or "effective" T2, whereas the first T2 can be considered the "natural" or "true" T2 of the tissue being imaged. T2* is always less than or equal to T2. T2* results principally from inhomogeneities in the main magnetic field.

T2-weighted images are a type of magnetic resonance imaging (MRI) that highlights differences in the T2 relaxation times of various tissues. T2 relaxation refers to the decay of transverse magnetization (Mxy) over time after an external radiofrequency (RF) pulse is applied.