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19F R2 (Hahn-echo)

Version: 0.1.2 • Status: 🔬 beta • Last Modified: 2025-11-15

Description

1D 19F broadband R2 Hahn-echo measurement

  • with 1H decoupling

Experiment Type

relaxation 1d

Features

  • R2
  • hahn_echo
  • broadband

Authors

Additional Fields

Field Value
File Name 19f_r2_bb.cw
File Path sequences/19f_r2_bb.cw
Git History {hash: d3999499, date: 2025-11-19, author: chriswaudby, email: cwaudby@gmail.com, message: fix looping}
{hash: e23a105b, date: 2025-11-16, author: chriswaudby, email: cwaudby@gmail.com, message: rename pulse to duration for reference pulse consistency}
{hash: 15d53f5b, date: 2025-11-16, author: chriswaudby, email: cwaudby@gmail.com, message: update experiment filenames}
{hash: c78ec494, date: 2025-11-16, author: chriswaudby, email: cwaudby@gmail.com, message: Update pulse sequence metadata and documentation}
{hash: 1018f450, date: 2025-09-30, author: chriswaudby, email: cwaudby@gmail.com, message: Add new sequences for 19F R1, R2, and perfect echo measurements; update schema fields and documentation}
Acquisition Order f1
relaxation.duration
Dimensions relaxation.duration
f1
Reference Pulse {channel: f1, duration: p1, power: pl1}
{channel: f2, duration: p3, power: pl2}
Relaxation {type: R2, model: exponential-decay, channel: f1, duration: t2delay}
Typical Nuclei 19F
1H

Created: 2024-05-21 Repository: github.com/waudbygroup/pulseprograms Schema version: 0.0.2

Source Code

View on GitHub: github.com/waudbygroup/pulseprograms/sequences/19f_r2_bb.cw

;@ schema_version: "0.0.2"
;@ sequence_version: "0.1.2"
;@ title: 19F R2 (Hahn-echo)
;@ description: |
;@   1D 19F broadband R2 Hahn-echo measurement
;@
;@   - with 1H decoupling
;@ authors:
;@   - Chris Waudby <c.waudby@ucl.ac.uk>
;@ created: 2024-05-21
;@ last_modified: 2025-11-15
;@ repository: github.com/waudbygroup/pulseprograms
;@ status: beta
;@ experiment_type: [relaxation, 1d]
;@ features: [R2, hahn_echo, broadband]
;@ typical_nuclei: [19F, 1H]
;@ dimensions: [relaxation.duration, f1]
;@ acquisition_order: [f1, relaxation.duration]
;@ reference_pulse:
;@ - {channel: f1, duration: p1, power: pl1}
;@ - {channel: f2, duration: p3, power: pl2}
;@ relaxation: {type: R2, model: exponential-decay, channel: f1, duration: t2delay}


#include <Avance.incl>
#include <Grad.incl>
#include <Delay.incl>

define list<delay> t2delay = <$VDLIST>
/****************************/
/* Initialize loop counters */
/****************************/
"l1=0"


"d11=30m"
"d12=20u"

"p20=600u"
;"p21=12u"
;"spw20=plw1*pow(p1/p21,2)"

; for baseopt
;"acqt0=-p1*2/3.1416"
"acqt0=0"
"DELTA=1m"

1 ze 
  d11 pl12:f2
2 30m do:f2

  "DELTA=t2delay[l1]*0.5"

  ; purge
  ;20u pl11:f1
  ;(2mp ph11):f1
  ;20u
  ;(3mp ph12):f1

  ; d1
  d1

  ; 90
  (p20:sp20 ph1):f1
  DELTA
  (p21:sp21 ph2):f1
  DELTA

  go=2 ph31 cpd2:f2
  d11 do:f2 mc #0 to 2 
     F1QF(calclc(l1, 1))

exit 


ph1 =0 2
ph2 =0 0 1 1 2 2 3 3
ph31=0 2 2 0

;pl12: f2 channel - power level for CPD/BB decoupling
;p16: homospoil/gradient pulse                       [0.5 msec]
;d1 : relaxation delay (excluding saturation time)
;d11: delay for disk I/O                             [30 msec]
;d12: delay for power switching                      [20 usec]
;d16: delay for homospoil/gradient recovery
;cpd2: decoupling according to sequence defined by cpdprg2
;pcpd2: f2 channel - 90 degree pulse for decoupling sequence
;p20: 600us BURBOP_19F_90
;spnam20: BURBOP_19F_90
;sp20: 20 kHz
;ns: 1 * n
;ds: 4


;for z-only gradients:
;gpz1: 41%

;use gradient files:   
;gpnam1: SMSQ10.100

Changelog

  • 2025-11-19 (d3999499): fix looping - chriswaudby
  • 2025-11-16 (e23a105b): rename pulse to duration for reference pulse consistency - chriswaudby
  • 2025-11-16 (15d53f5b): update experiment filenames - chriswaudby
  • 2025-11-16 (c78ec494): Update pulse sequence metadata and documentation - chriswaudby
  • 2025-09-30 (1018f450): Add new sequences for 19F R1, R2, and perfect echo measurements; update schema fields and documentation - chriswaudby