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| library:time_to_repeat [2025/06/18 21:48] – scott | library:time_to_repeat [2025/06/21 18:45] (current) – [TR and Specific Absorption Rate] scott | ||
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| ====TR and Specific Absorption Rate==== | ====TR and Specific Absorption Rate==== | ||
| - | Specific Absorption Rate (SAR) is an estimate of how much RF energy will be deposited into the patient over a certain length of time scanning. One of the many factors that can affect the calculated SAR is the TR and the number of slices. A lower TR will mean that RF pulses are more closely spaced together, depositing more RF energy into the patient. A SAR limit may be reached when the TR is low and a large number of slices is used, especially post contrast imaging, where most sequences are T1 weighted. To counteract this, a slightly longer TR can be selected to build in some 'dead time' into the sequence, at the cost of scan time. There are other more effective means of managing SAR limitation with small animal imaging to be found __Here__. | + | Specific Absorption Rate (SAR) is an estimate of how much RF energy will be deposited into the patient over a certain length of time scanning. One of the many factors that can affect the calculated SAR is the TR and the number of slices. A lower TR will mean that RF pulses are more closely spaced together, depositing more RF energy into the patient. A SAR limit may be reached when the TR is low and a large number of slices is used, especially post contrast imaging, where most sequences are T1 weighted. To counteract this, a slightly longer TR can be selected to build in some 'dead time' into the sequence, at the cost of scan time. There are other more effective means of managing SAR limitation with small animal imaging to be found __[[specific_absorption_rate|Here]]__. |