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- Manipulating TR and TE helps us to weight the contrast of the image to a certain parameter while diminishing the impact of other parameters
- In PD weighting, the intrinsic contrast of tissues is accentuated. This is done by reducing the T1 and T2 effects on imaging
- A long TR reduces T1 effects, a short TE reduces T2 effects. This is best for PD weighting
- Lower the density of protons, lower the transverse magnetization, hence lower the signal
- PD weighting is good for showing both anatomy and to a certain extent pathology simultaneously
What values do you enter to get a PD weighted image?
- TR: 2000 ms or more
- TE: 10 – 30 ms
What are the common sequences used to produce T1 weighted imaging?