T1-weighted imaging
Pronunciation: TEE-one WAY-ted IM-ij-ing
MRI sequence that emphasizes differences in T1 relaxation times between tissues, providing excellent anatomical detail and gray-white matter contrast.
Full Definition
T1-weighted imaging is a fundamental MRI sequence that highlights the longitudinal relaxation properties of tissues. It produces images where fat appears bright, cerebrospinal fluid appears dark, and provides superior anatomical definition of brain structures. This sequence is essential for identifying structural abnormalities, measuring cortical thickness, and serving as a reference for other imaging modalities. T1-weighted images are typically acquired using short repetition times (TR) and short echo times (TE).
Usage
Usage note: Always hyphenate when used as an adjective before a noun.
In Context
- "The radiologist noted hyperintense lesions on T1-weighted imaging, suggesting melanoma metastases." — Radiology report
- "Pre-contrast T1-weighted imaging showed no evidence of hemorrhage in the tumor bed." — Clinical assessment