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library:slice_thickness [2025/07/08 18:10] – scottlibrary:slice_thickness [2025/07/08 18:17] (current) – scott
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   - At the same time as the Slice Select gradient is activated, a radiofrequency pulse will be played out over a few thousand hz, corresponding to the desired slice thickness. This is known as the RF transmit bandwidth.   - At the same time as the Slice Select gradient is activated, a radiofrequency pulse will be played out over a few thousand hz, corresponding to the desired slice thickness. This is known as the RF transmit bandwidth.
      
-By modifying either the transmit bandwidth and the strength of the slice select gradient, different slice thickness may be achieved. Typically the transmit bandwidth is not changed much, rather it is the slice select gradient that is primarily used to determine slice thickness.+By modifying either the transmit bandwidth and the strength of the slice select gradient, different slice thickness may be achieved. Typically the transmit bandwidth is not changed much, rather it is the slice select gradient that is primarily used to determine slice thickness. In the example below, a 2000 hz range of frequencies between 63 and 63.5 MHz is transmitted while a gradient is turned on, exciting a slice of tissue (green) a a little above isocenter; in this process both the slice thickness and location are determined by the RF and gradient combination. 
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 +{{ :library:slice_selection.png?600 |}}