Object ID: 00000018WIA303B1970GYZ
Topic ID: id_40025209 Version: 1.5
Date: Aug 28, 2022 3:44:59 PM

FSE T1 Optimization

Use FSE T1 Optimization to optimize the T1 contrast in brain and spine images acquired with 2D FSE T1 pulse sequences.

Figure 2. Note darker CSF signal in FSE brain image acquired with FSE T1 optimization

Table 1. Image legend
Number	Description
1	FSE T1-weighted image
2	FSE T1-weighted image with FSE T1 Optimization

The User CV applies a +90° RF pulse at the end of the echo train that results in a darker signal from fluids thus improving T1 contrast when compared to a conventional FSE sequence. In addition, the scan time may be decreased when compared to a SE T1 sequence.

Figure 3. Additional 90° RF pulse improves T1 contrast

Select a recommended TR of 700 ms for both brain and spine scans on 1.5T MR systems.
Acquire two acquisitions to reduce magnetization transfer effects that occur with FSE T1 Optimization.
If the scan time is too long, either reduce the number of slices to one acquisition or acquire two acquisitions.
Superior and Inferior saturation bands are recommended to avoid flow artifacts in the brain.
The last 180° and +90° RF pulse combination sets the M_z magnetization such that it becomes similar to an inversion prepared sequence.

Warning

With post-contrast imaging using inversion-prepared pulse sequences, there is a potential that lesion conspicuity may be reduced and some lesions may not be apparent in comparison to T1-weighted spin-echo imaging.