Which parameter is typically adjusted to enhance the contrast of MRI images?

Enhancing contrast in MRI images is significantly influenced by the time of echo (TE). TE is one of the key parameters that affects the timing between the application of the radiofrequency pulse and the time the signals are read out. By adjusting TE, radiologists can manipulate the T2 relaxation time, which varies between different tissues. This differentiation allows for better visualization of structures and pathologies in the body. For example, longer TE can enhance the contrast of fluid-filled structures, as they exhibit longer T2 relaxation time, while shorter TE is better for imaging tissues with shorter T2 times.

In contrast, voxel size, slice thickness, and field of view are more related to spatial resolution and coverage of the scanned area rather than directly enhancing the image contrast. Voxel size and slice thickness determine the amount of detail and depth of the images, while field of view defines the size of the area being imaged. Adjusting these parameters impacts the overall quality and detail of the images but does not specifically enhance contrast in the same way that manipulating TE does.