T1- weighted image

Magnetic resonance images show a hyperintensity (hypervascularity) of a heterogeneous mass by T1 weighted images.

A mottled pattern with increased signal intensity is seen on T1 weighted images due to fatty tissue interspersed with the thickened trabeculae.

On T1 weighted images tumours have a low signal intensity, appearing dark; on T2 weighted images they have a higher signal and look bright.

HCC appears as a high intensity pattern on T2 weighted images and a low intensity pattern on T1 weighted images.

Inversion recovery sequence for obtaining a T1 weighted image The magnetisation is allowed to recover for a time TI, after which it is imaged using a 90 degree pulse, and usual imaging gradients.

The gadolinium in the contrast fluid yields a bright hyperintense signal on T1 weighted images and allows evaluation of quite small defects of the joint capsule, the articular surface of the bones and of the labral cartilage.

On MRI, the marrow signal is not supposed to be brighter than the adjacent intervertebral disc on T1 weighted images, either in the coronal or sagittal plane, where they can be assessed immediately adjacent to one another.