## Shape Generator

This window provides the means to generate, display, and store a shaped RF pulse or PFG.

**Shapes:** This pull-down button provides a menu of standard shapes (select OTHER to define your oun shape).
**Other:** Displays the analytical expression of the selected shape function and allows the user to enter/edit a user-defined shape.
Use this edit box so specify your own shape function (use Matlab conventions, i.e. a squared sine function should be written here as *sin(x).^2 *. In order to use this box, first select "OTHER" in the **Shapes** window (1). If a stored shape function is loaded, its analytical expression is shown in this box.
**Shape Display:** A plot of the selected shape. The abscissa axis is the time axis.
**Excitation Profile:** A plot of the Fourier transformation of the selected shape. The abscissa axis displays frequency in Hz or ppm.
**Data Analysis Box:** Displays the integral (area under the graph) of the selected shape funstion and the ratio of this integral to that for a rectangular pulse of the same duration.
**Defaults:** Click to set the default parameter values for a stadand shape function.
**EXIT button:** Click to exit the Shape Generator and close the Window.
**LOAD button:** Click to activate the load window in order to load shape function stored earlier.
**DRAW button:** CLick to plot the selected shape function and its Furier Transformation.
**SAVE button:** Click to activate the save window to save the selected shape for further use in the "experiment".
**Frequency units:** Select frequency units (Hz or ppm) for the graph of the Fourier Transform. After the desired unit has been selected, click on the **DRAW** button to update the graphs.
**Pulse length [ms]:** Specify the duration of the shaped pulse. The value of 0 will be interpreted as a value from the lower to the upper bounds, in ms.
**Upper bound:** Specify the abscissa for the rightmost point (upper limit for *x* value) for the selected shape function.
**Lower bound:** Specify the abscissa for the leftmost point (lower limit for *x* value) for the selected shape function.
**Number of points:** Specify the number of data points to represent the selected shape.

BACK TO MAIN VNMR VINDOW

BACK TO VNMR MANUAL
Back to top

Page designed by David Fushman. Modified 11/26/2002.