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T 2 *-weighted GRE sequences can detect microhemorrhages as seen in most vestibular schwannomas, thereby differentiating them from meningiomas. [2] The T 2 *-weighted GRE sequence can detect a "middle cerebral artery susceptibility sign", which is a dark linear filling defect that is wider than the corresponding artery on the contralateral side ...
Gradient recalled echo (GRE) imaging is the conventional way to detect hemorrhage in CAA, however SWI is a much more sensitive technique that can reveal many micro-hemorrhages that are missed on GRE images. [7] A conventional gradient echo T2*-weighted image (left, TE=20 ms) shows some low-signal foci associated with CAA.
To create a T2-weighted image, magnetization is allowed to decay before measuring the MR signal by changing the echo time (TE). This image weighting is useful for detecting edema and inflammation, revealing white matter lesions , and assessing zonal anatomy in the prostate and uterus .
Effective T2 or "T2-star" T2* Spoiled gradient recalled echo (GRE) with a long echo time and small flip angle [74] Low signal from hemosiderin deposits (pictured) and hemorrhages. [74] Susceptibility-weighted: SWI: Spoiled gradient recalled echo (GRE), fully flow compensated, long echo time, combines phase image with magnitude image [75]
Effective T2 or "T2-star" T2* Spoiled gradient recalled echo (GRE) with a long echo time and small flip angle [8] Low signal from hemosiderin deposits (pictured) and hemorrhages. [8] Susceptibility-weighted: SWI: Spoiled gradient recalled echo (GRE), fully flow compensated, long echo time, combines phase image with magnitude image [9]
Effective T2 or "T2-star" T2* Spoiled gradient recalled echo (GRE) with a long echo time and small flip angle [20] Low signal from hemosiderin deposits (pictured) and hemorrhages. [20] Susceptibility-weighted: SWI: Spoiled gradient recalled echo (GRE), fully flow compensated, long echo time, combines phase image with magnitude image [21]
This axial T2-weighted (CSF white) MR scan shows a normal brain at the level of the lateral ventricles. The record for the highest spatial resolution of a whole intact brain (postmortem) is 100 microns, from Massachusetts General Hospital. The data was published in Scientific Data on 30 October 2019. [17] [18]
In MRI, T 2-weighted images can be obtained by selecting an echo time on the order of the various tissues' T 2 s. [8] In order to reduce the amount of T 1 information and therefore contamination in the image, excited spins are allowed to return to near-equilibrium on a T 1 scale before being excited again. (In MRI parlance, this waiting time is ...