Define the shape from the XWIN-NMR shape tool:

• Select the desired BURP pulse from the Shapes-->Burp menu:
  
  
Excitation: E-BURP1 Excitation: E-BURP2 Inversion: I-BURP1 Inversion: I-BURP2 90 deg: U-BURP 180 deg: RE-BURP

and modify the following parameter if required:

Size of Shape: 1000

• Store the shape from the File-->Save As ... menu.
• Otherwhise, the shape can be generated directly from the XWIN-NMR command line:

Syntax:
st generate <shape type> <size>
or
st generate <shape type> <size> false

In the second case only amplitude data are generated.
int <size> = shape size in number of points
string <shape type> = one of:

EBurp1, EBurp2, IBurp1, IBurp2,
ReBurp, UBurp1, I2Burp, I3Burp.
Example: st generate IBurp1 1000

From the Analyze menu we can obtain the following information:

• Calculate Bandwith for Excitation [bandw2]
• Calculate Bandwith for Inversion [bandw2i]
• Calculate Bandwith for Refocusing -My [bandw2ry]
• Calculate gammaB1max on Resonance [calcb1m]
• Calculate gammaB1max off Resonance [calcb1mo]
• Calculate average Power Level [calcpav]
• Integrate Shape and compare to Square [integr]
• Integrate Shape compared to Hard Pulse [integr2]

 

Shape	EBURP-1	EBURP-2	IBURP-1	IBURP-2	UBURP	REBURP
Amplitude relative to a   square pulse of 100%	0.067	0.061	0.149	0.1	0.024	0.08
Corresponding difference to a 100%   square pulse of the same duration (in dB)	23.46	24.28	16.49	19.94	32.15	21.95

 
 

EBURP-1 Shape  (in ms)	1	5	10	20	40	60	80	100
Maximum gammaB1   (on resonance) (in Hz)	3724.9	745.0	372.5	186.2	93.1	62.1	46.6	37.2
Corresponding 90 degree  square pulse (in ms)	0.067	0.33	0.67	1.34	2.69	4.03	5.37	6.71
Change of power level   compared to level of a 10 us hard  90 degree pulse (in dB)	16.53	30.51	36.54	42.56	48.58	52.1	54.6	56.53

 

EBURP-2 Shape  (in ms)	1	5	10	20	40	60	80	100
Maximum gammaB1   (on resonance) (in Hz)	4096.0	819.2	409.6	204.8	102.4	68.3	51.2	41.0
Corresponding 90 degree  square pulse (in ms)	0.061	0.31	0.61	1.22	2.44	3.66	4.88	6.10
Change of power level   compared to level of a 10 us hard  90 degree pulse (in dB)	15.71	29.69	35.71	41.73	47.75	51.27	53.77	55.71

 
 

IBURP-1 Shape  (in ms)	1	5	10	20	40	60	80	100
Maximum gammaB1   (on resonance) (in Hz)	3340.9	668.2	334.1	167.0	83.5	55.7	41.8	33.4
Corresponding 90 degree  square pulse (in ms)	0.075	0.37	0.75	1.50	3.00	4.49	5.99	7.48
Change of power level   compared to level of a 10 us hard  90 degree pulse (in dB)	23.50	37.48	43.50	49.52	55.54	59.06	61.56	63.5

 
 

IBURP-2 Shape  (in ms)	1	5	10	20	40	60	80	100
Maximum gammaB1   (on resonance) (in Hz)	4967.0	993.4	496.7	248.3	124.2	82.8	62.1	49.7
Corresponding 90 degree  square pulse (in ms)	0.05	0.25	0.5	1.01	2.01	3.02	4.03	5.03
Change of power level   compared to level of a 10 us hard  90 degree pulse (in dB)	20.06	34.041	40.06	46.08	52.1	55.62	58.12	60.06

 
 

UBURP Shape  (in ms)	1	5	10	20	40	60	80	100
Maximum gammaB1   (on resonance) (in Hz)	10131	2026.35	1013.2	506.6	253.3	168.9	126.6	101.3
Corresponding 90 degree  square pulse (in ms)	0.025	0.123	0.246	0.49	0.99	1.48	1.97	2.47
Change of power level   compared to level of a 10 us hard  90 degree pulse (in dB)	7.85	21.82	27.85	33.87	39.89	43.41	45.91	47.85

 
 

REBURP Shape  (in ms)	1	5	10	20	40	60	80	100
Maximum gammaB1   (on resonance) (in Hz)	6258.6	1251.7	625.9	312.9	156.5	104.3	78.2	62.6
Corresponding 90 degree  square pulse (in ms)	0.04	0.2	0.4	0.8	1.6	2.4	3.2	4
Change of power level   compared to level of a 10 us hard  90 degree pulse (in dB)	18.05	32.03	38.05	44.07	50.1	53.61	56.11	58.05

 

 More sophisticated excitation schemes can be derived from the Manipulate menu.

The theoretical excitation and inversion profiles of the BURP shaped pulse can be visualized from the NMRSIM program:

A) E-BURP2 shaped pulse as a excitation element:

• Select the corresponding File-->Experiment Setup-->Load from File ... menu.
• Choose the profile.cfg configuration file.
• Set the shape to e2burp.shp in the Go-->Check Experiment parameters menu.
• Select the Go-->Run Experiment menu.
• The result of the simulation is displayed in the nmrsim 1 1 file into the XWIN-NMR window. Transform the data with ef (lb=1).
• The duration of the shaped pulse can be modified by changing the P5 parameter (by default, 5 ms) in the Go-->Check Experiment parameters menu. Repeat the 4 and 5 steps to obtain the new profile.

 

B) I-BURP2 shaped pulse as a inversion element:

• Select the corresponding File-->Experiment Setup-->Load from File ... menu.
• Choose the profile180.cfg configuration file.
• Set the shape to i2burp.shp in the Go-->Check Experiment parameters menu.
• Select the Go-->Run Experiment menu.
• The result of the simulation is displayed in the nmrsim 1 1 file into the XWIN-NMR window. Transform the data with ef (lb=1).
• The duration of the shaped pulse can be modified by changing the P5 parameter (by default, 10 ms) in the Go-->Check Experiment parameters menu. Repeat the 3 and 4 steps to obtain the new profile.

 

C) I-BURP2 shaped pulse as a refocussing element:

• Select the corresponding File-->Experiment Setup-->Load from File ... menu.
• Choose the spfge.cfg configuration file.
• Set the shape to i2burp.shp in the Go-->Check Experiment parameters menu.
• Select the Go-->Run Experiment menu.
• The result of the simulation is displayed in the nmrsim 1 1 file into the XWIN-NMR window. Transform the data with ef (lb=1).

The duration of the shaped pulse can be modified by changing the P5 parameter (by default, 10 ms) in the Go-->Check Experiment parameters menu. Repeat the 3 and 4 steps to obtain the new profile.
 

D) RE-BURP shaped pulse as a refocussing element:

• Select the corresponding File-->Experiment Setup-->Load from File ... menu.
• Choose the spfge.cfg configuration file.
• Set the shape to reburp.shp in the Go-->Check Experiment parameters menu.
• Select the Go-->Run Experiment menu.
• The result of the simulation is displayed in the nmrsim 1 1 file into the XWIN-NMR window. Transform the data with ef (lb=1).
• The duration of the shaped pulse can be modified by changing the P5 parameter (by default, 10 ms) in the Go-->Check Experiment parameters menu. Repeat the 3 and 4 steps to obtain the new profile.