What is the TE and TR for a standard T2 weighted axial brain SE sequence?

In MRI, T2-weighted images are obtained by using specific echo time (TE) and repetition time (TR) parameters that enhance the differences in relaxation times of tissues. For a standard T2-weighted axial brain spin echo sequence, it is important to choose longer TE and TR values compared to T1-weighted imaging to effectively capture the fluid and differentiate various tissue types.

Option B highlights a TE of 105 ms and a long TR of 4616 ms. The long TR allows sufficient time for the longitudinal relaxation of the tissues, which is crucial in T2-weighted imaging since it maximizes the signal from T2-relaxing tissues like cerebrospinal fluid (CSF) and highlights edema or lesions in the brain. The TE of 105 ms is appropriate here, as it is long enough to capitalize on T2 decay for optimal contrast between different soft tissues in the brain.

Comparing to the other options, they either have shorter TRs or inappropriate TE values that do not align with the typical parameters used for achieving high-quality T2-weighted images in brain MRI. For instance, T2-weighted imaging generally requires longer echo times to better visualize the differences between fluid and other tissues, which the other choices fail to