Teach yourself how to read brain MRI scans
Jan 16, 2023
Source: Cainiu Health
Dr. Lv Zhiqin
Introduction
MRI brain images include T1-weighted, T2-weighted, diffusion-weighted, and FLAIR imaging. T1-weighted images primarily show the anatomical structures of the brain, while T2-weighted images are mainly used to reveal brain abnormalities. FLAIR imaging is typically a fluid-attenuated version of T2-weighted images, and diffusion-weighted imaging is generally used to detect acute cerebral infarction.
Brain MRI can accurately detect relatively early and subtle lesions. Different locations and sequences reflect different conditions, with imaging including T1-weighted, T2-weighted, FLAIR (Fluid-Attenuated Inversion Recovery) imaging, as well as specialized brain diffusion imaging. Details are as follows:
1. T1-weighted imaging is primarily used to display fine anatomical structures of the brain, especially soft tissues. It clearly shows gray matter, white matter, and the course of nerve fibers.
2. T2-weighted imaging is mainly used to identify brain abnormalities. Lesions typically appear as abnormal signals, usually presenting as high signal intensity.
3. FLAIR imaging is generally a T2-weighted sequence with water signal suppression. By suppressing the signal from fluid, lesions become more clearly visible on this sequence, typically appearing as high signal intensity.
4. Diffusion-weighted imaging (DWI) is primarily used to detect acute cerebral infarction. Affected areas usually appear bright (white) on DWI, while corresponding areas appear dark (black) on the apparent diffusion coefficient (ADC) map.
To properly interpret brain MRI scans, one must first distinguish the imaging orientation, then identify the specific imaging sequence used, and finally determine whether the lesion signals are abnormal. Medication should be taken only under the guidance of a qualified physician, and surgery should be performed at a正规 medical institution.
