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| library:time_to_repeat [2025/05/05 16:27] – [TR in Fast Spin Echo] scott | library:time_to_repeat [2025/05/05 16:28] (current) – scott | ||
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| ===TR in Fast Gradient Echo=== | ===TR in Fast Gradient Echo=== | ||
| - | When TR's become very short (<T1 and T2), a steady state can be achieved with the longitudinal magnetization. This means that after each TR, the same amount of longitudinal magnetization is recovered as is lost to RF excitation. To prevent total saturation of the signal, lower flip angles (5-15 degrees) are used. When utilizing these sequences, the TR may not be selectable and is no longer the primary parameter controlling image contrast, instead flip angle and sequence type will be most important. | + | When TR's become very short (<T1 and T2), a steady state can be achieved with the longitudinal magnetization. This means that after each TR, the same amount of longitudinal magnetization is recovered as is lost to RF excitation. To prevent total saturation of the signal, lower flip angles (5-15 degrees) are used. When utilizing these sequences, the TR may not be selectable and is no longer the primary parameter controlling image contrast, instead flip angle and sequence type will be most important. |
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