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.

2020年7月30日 · T2W Flair－－抑制自由水的T2图像，便于鉴别脑室内/周围高信号病灶（如多发性硬化、脑室旁梗塞灶）以及与脑脊液信号难于鉴别的蛛网膜下腔出血，肿瘤及肿瘤周围水肿等。 T2* GRE －－梯度回波的准T2加权像，显示细微钙化和出血病变。

2022年11月30日 · This article contains a list of commonly and less commonly used MRI pulse sequence abbreviations and their meaning. If available, an explanation is included in a separate article. T2*: T2 star. PRESS: point resolved spectroscopy.

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.

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 …

皇家飞利浦这个序列叫“enhanced-T1 High Resolution Isotropic Volume Examination”，简称 e-THRIVE，中文翻译“T1高分辨各向同性容积激发”。 我们可以看到，这个序列的基本原理是“三维容积内插快速扰相T1梯度回波序列”。 三家公司在命名的时候，都考虑到了序列的原理及特点。 三家公司都强调了是容积激发（也就是三维3D扫描）。 不同的是，GE强调的是肝脏，加速；西门子强调的是屏息，内插；飞利浦强调的是它的权重T1以及高分辨。 当然，除了这个规则，我前面 …

2021年6月9日 · t2信号跟水含量有关,许多病灶的t2信号要强于周围的正常组织,常呈高亮状态，因此从t2序列中可以清楚的看到病灶所处位置、大小。 但对比标签图可发现，增强肿瘤周围的浮肿区域在T2序列中较为模糊，难以清晰勾勒出浮肿区域轮廓。

2022年5月6日 · T2W Flair－－抑制自由水的T2图像，便于鉴别脑室内/周围高信号病灶（如多发性硬化、脑室旁梗塞灶）以及与脑脊液信号难于鉴别的蛛网膜下腔出血，肿瘤及肿瘤周围水肿等。 T2* GRE －－梯度回波的准T2加权像，显示细微钙化和出血病变。

t2对比：激励脉冲的偏转角影响图像的加权对比，当用小角度(＜30°)、较长回波时间(30-60ms)可以得到t2加权图像. t1对比：使用大偏转角( 45-90°)和短te(＜15°)可得到t1加权像。 临床应用： 扰相gre-t1wi

This article aims (a) to review the basics of T2* relaxation and various T2*-based MR sequences and illustrate their clinical applications in neurologic and body imaging, and (b) to review principles, techniques, and clinical uses of T2*-based MR applications including susceptibility-weighted (SW), perfusion, functional, and iron overload imaging.