void phase_encode3_gradpulse(double stat1, double stat2, double stat3, \
double duration, double step1, double step2, double step3, \
int vmult1, int vmult2, int vmult3, double lim1, double lim2, double lim3)
{
if (duration >= 2.40e-6)
{
phase_encode3_gradient(stat1,stat2,stat3,step1,step2,step3,vmult1,vmult2,vmult3,lim1,lim2,lim3);
delay(duration);
zero_all_gradients();
}
}
pulsesequence()
{
double pd, seqtime;
double mintDELTA,ted1,ted2,gf;
double restol, resto_local;
init_mri(); /****needed ****/
restol=getval("restol"); //local frequency offset
roff=getval("roff"); //receiver offset
init_rf(&p1_rf,p1pat,p1,flip1,rof1,rof2); /* hard pulse */
calc_rf(&p1_rf,"tpwr1","tpwr1f");
init_rf(&p2_rf,p2pat,p2,flip2,rof1,rof2); /* hard pulse */
calc_rf(&p2_rf,"tpwr2","tpwr2f");
gf=1.0;
if(diff[0] == 'n') gf=0;
int vph180 = v2; /* Phase of 180 pulse */
mintDELTA = tdelta + trise + rof1 + p2 + rof2;
if(tDELTA <= mintDELTA) {
abort_message("%s: tDELTA too short. Min tDELTA = %f ms",seqfil,mintDELTA*1e3);
}
ted1 = tDELTA - tdelta + trise + p2 + rof1 + rof2;
te = p1/2 + rof2 + tdelta + trise + ted1 + rof1 + p2/2; /* first half-te */
ted2 = te - p2/2 - rof2 - tdelta - trise;
if((ted1 <= 0)||(ted2 <= 0) ) {
abort_message("%s: tDELTA too short. Min tDELTA = %f ms",seqfil,mintDELTA*1e3);
}
te = te*2.0;
putvalue("te",te);
seqtime = at+(p1/2.0)+rof1+te;
pd = tr - seqtime; /* predelay based on tr */
if (pd <= 0.0) {
abort_message("%s: Requested tr too short. Min tr = %f ms",seqfil,seqtime*1e3);
}
resto_local=resto-restol;
status(A);
rotate();
delay(pd);
xgate(ticks);
/* --- observe period --- */
obsoffset(resto_local);
obspower(p1_rf.powerCoarse);
obspwrf(p1_rf.powerFine);
shapedpulse(p1pat,p1,oph,rof1,rof2);
obl_gradient(0,0,gdiff*gf); /* x,y,z gradients selected via orient */
delay(tdelta);
zero_all_gradients();
delay(trise);
delay(ted1);
obspower(p2_rf.powerCoarse);
obspwrf(p2_rf.powerFine);
settable(t2,2,ph180); /* initialize phase tables and variables */
getelem(t2,ct,v6); /* 180 deg pulse phase alternates +/- 90 off the rcvr */
add(oph,v6,vph180); /* oph=zero */
shapedpulse(p2pat,p2,vph180,rof1,rof2);
obl_gradient(0,0,gdiff); /* x,y,z gradients selected via orient */
delay(tdelta);
zero_all_gradients();
delay(trise);
delay(ted2);
startacq(alfa);
acquire(np,1.0/sw);
endacq();
}
pulsesequence()
{
/*******************************************************/
/* Internal variable declarations */
/*******************************************************/
double predelay;
double agss,grate,gssint, gssrint;
double t_after, acq_delay, min_tr;
double t_rampslice, t_plateau_sr, t_plateau_min, t_ramp_sr;
double slice_offset,f_offset;
double pss0;
char slice_select[MAXSTR];
initparms_sis(); /* Sets default state of receiver to ON */
/*- will be obsolete on future VNMR versions */
/***************************/
/* initialize variables */
/***************************/
gssf = 1.0; /* slice select fractional refocus */
predelay = PREDELAY; /* define predelay [s] */
acq_delay = ACQ_DELAY; /* time delay between end of refocus and acq */
slice_offset = 0.0; /* force slice offset to 0.0 [cm] */
t_rampslice = 0.0; /* slice select ramp time */
t_ramp_sr = 0.0; /* slice refocusing ramp time */
t_plateau_min = 0.0005; /* min time slice refocusing plateau */
t_plateau_sr =0.0; /* slice refocusing plateau time*/
f_offset=getval("resto");
agss = fabs(gss); /* absolute slice select gradient */
gssr = gmax; /* maximum slice refocusing gradient */
grate = trise/gmax; /* define gradient slew rate [s*cm/g]
trise = gradient rise time
gmax = maximum gradient strength [G/cm] */
ticks = IGNORE_TRIGGER; /* ignore trigger pulses */
/***************************/
/* Get parameter */
/***************************/
at = getval("at");
pss0 = getval("pss0");
getstr("slice_select",slice_select); /* slice select flag
[y] = ON, [n] = OFF */
/*******************************************************/
/* Slice Select gradient area */
/*******************************************************/
t_rampslice = grate * agss;
gssint = (agss*p1/2.0) + (agss*t_rampslice/2.0);
gssrint=gssint;
/*******************************************************
* Calculate slice refocussing gradient *
*******************************************************/
t_plateau_sr = (gssint / gssr) - trise;
if (t_plateau_sr <= 0.0) /* traingular gradients */
{
t_plateau_sr = 0.0;
gssr = sqrt(gssint / grate);
}
t_ramp_sr = gssr * grate; /* ramp time for refocusing gradient*/
gssrint = (gssr * t_plateau_sr) + (t_ramp_sr * gssr);
/***************************************************************************
* timing calculation *
***************************************************************************/
if (slice_select[0] == 'y')
{
t_after = tr - (predelay + p1 + t_plateau_sr + at + acq_delay + 2* (t_rampslice + t_ramp_sr));
min_tr = predelay + p1 + t_plateau_sr + at + acq_delay + 2* (t_rampslice + t_ramp_sr);
}
else
{
t_after = tr - (predelay + p1 + at + acq_delay );
min_tr = predelay + p1 + at + acq_delay ;
}
if (t_after < 0.0)
{
abort_message("Requested repetition time (TR) too short. Min tr = %.f[ms]\n",min_tr*1000);
}
/******************************************************/
/* */
/* S T A R T */
/* P U L S E S E Q U E N C E */
/* */
/******************************************************/
obspower(tpwr1); /* set tranmitter power */
/***************************************************************************
* Predelay *
***************************************************************************/
obsoffset(f_offset); /* set transmitter offset */
delay(predelay);
xgate(ticks); /* set gating */
if (slice_select[0] == 'y')
{
/***************************************************************************
* Slice select gradient & RF pulse *
***************************************************************************/
obl_gradient(0.0,0.0,gss); /* slice select gradient */
delay(t_rampslice); /* delay - time to ramp up gradient */
shaped_pulse(p1pat,p1,oph,rof1,rof1);
zero_all_gradients(); /* force all gradients back to 0 [G/cm] */
delay(t_rampslice); /* time to ramp down gradient */
/***************************************************************************
* Slice refocus gradient *
***************************************************************************/
obl_gradient(0.0,0.0,-gssr); /* slice refocus gradient */
delay(t_ramp_sr+t_plateau_sr); /* ramp up of refocus gradient */
zero_all_gradients(); /* force refocus gradient back to 0 [G/cm] */
delay(t_ramp_sr); /* time to ramp down gradient */
}
else
{
shaped_pulse(p1pat,p1,oph,rof1,rof1);
}
/***************************************************************************
* Pre-acquire delay *
***************************************************************************/
delay(acq_delay);
/***************************************************************************
* Acquire echo *
***************************************************************************/
startacq(alfa);
acquire(np,1.0/sw); /* acquire FID */
endacq();
delay(t_after); /* time padding to fill TR */
/******************************************************/
/* */
/* E N D */
/* P U L S E S E Q U E N C E */
/* */
/******************************************************/
}
/*-------------------------------------------------------------------
|
| test4acquire()
| check too see if data has been acquired yet.
| if it has not then do an implicit acuire.
| else do not.
| Author Greg Brissey 7/10/86
+------------------------------------------------------------------*/
void test4acquire()
{
int i;
int chan;
int MINch;
double acqdelay; /* delay time between receiver On an data acquired*/
codeint *tmpptr; /* temp pointer into codes */
extern void prg_dec_off();
double truefrq=0.0, dqdfrq=0.0;
char osskip[4];
if (bgflag)
fprintf(stderr,"test4acquire(): acqtriggers = %d \n",acqtriggers);
if (acqtriggers == 0) /* No data acquisition Yet? */
{
if (nf > 1.0)
{
text_error("Number of FIDs (nf) Not Equal to One\n");
psg_abort(0);
}
if (ap_interface < 4)
HSgate(rcvr_hs_bit,FALSE); /* turn receiver On */
else
SetRFChanAttr(RF_Channel[OBSch], SET_RCVRGATE, ON, 0);
if (newacq)
{
/* execute osskip delay if osskip parameter set */
if ((P_getstring(GLOBAL,"qcomp",osskip,1,2)) == 0)
{
if (osskip[0] == 'y')
{
/* fprintf(stderr,"hwlooping:test4acquire(): executing dsposskipdelay= %g\n", dsposskipdelay); */
if (dsposskipdelay >= 0.0) G_Delay(DELAY_TIME, dsposskipdelay, 0);
}
}
HSgate(INOVA_RCVRGATE,FALSE); /* turn receiver On */
}
/* txphase(zero); */ /* set xmitter phase to zero */
/* decphase(zero); */ /* set decoupler phase to zero */
/* acqdelay = alfa + (1.0 / (beta * fb) ); */
for (i = 1; i <= NUMch; i++) /* zero HS phaseshifts */
SetRFChanAttr(RF_Channel[i], SET_RTPHASE90, zero, 0);
if ((!noiseacquire) && (dsp_params.il_oversamp > 1))
find_dqdfrq(&truefrq, &dqdfrq);
if (fabs(dqdfrq) > 0.1)
set_spare_freq(OBSch);
/* obsoffset(truefrq+dqdfrq); */
acqdelay = alfa + (1.0 / (beta * fb) );
if (acqdelay > ACQUIRE_START_DELAY)
acqdelay = acqdelay - ACQUIRE_START_DELAY;
if ((fabs(dqdfrq) > 0.1) && (acqdelay > 1.7e-6)) /* more like 40us?? */
acqdelay = acqdelay - 1.7e-6;
if ((acqdelay < 0.0) && (ix == 1))
text_error("Acquisition filter delay (fb, alfa) is negative (%f).\n",
acqdelay);
else
G_Delay(DELAY_TIME,acqdelay,0); /* alfa delay */
acquire(np,1.0/sw); /* acquire data */
MINch = (ap_interface < 4) ? DODEV : TODEV;
for (chan = MINch; chan <= NUMch; chan++)
{
if ( is_y(rfwg[chan-1]) )
{
if ( (ModInfo[chan].MI_dm[0] == 'n') ||
((ModInfo[chan].MI_dm[0] == 'y') &&
(ModInfo[chan].MI_dmm[0] != 'p')) )
{
prg_dec_off(2, chan);
}
}
}
tmpptr = Aacode + multhwlp_ptr; /* get address into codes */
*tmpptr = 1; /* impliicit acquisition */
}
if (newacq)
{
if (explicitacq)
{
codeint *ptr;
/* update last acquire with disable overload */;
ptr = Aacode + disovld_ptr;
*ptr++ = DISABLEOVRFLOW;
*ptr = adccntrl;
}
/* Always set to FALSE for the next array element */
explicitacq = FALSE;
}
if (grad_flag == TRUE)
{
zero_all_gradients();
}
if (newacq)
{
gatedecoupler(A,15.0e-6); /* init to status A conditions */
statusindx = A;
}
putcode(STFIFO); /* start fifo if it already hasn't */
putcode(HKEEP); /* do house keeping */
if (newacq)
{
if ( getIlFlag() )
{
ifzero(ilflagrt);
putcode(IFZFUNC); /* brach to start of scan (NSC) if ct<nt */
putcode((codeint)ct);
putcode((codeint)ntrt);
putcode(nsc_ptr); /* pointer to nsc */
elsenz(ilflagrt);
add(strt,one,tmprt);
putcode(IFZFUNC); /* brach to start of scan (NSC) if ct<strt+1 */
putcode((codeint)ct);
putcode((codeint)tmprt);
putcode(nsc_ptr); /* pointer to nsc */
modn(ct, bsval, tmprt);
putcode(IFZFUNC); /* brach to start of scan (NSC) if ct%bs */
putcode((codeint)zero);
putcode((codeint)tmprt);
putcode(nsc_ptr); /* pointer to nsc */
endif(ilflagrt);
}
else
{
putcode(IFZFUNC); /* brach to start of scan (NSC) if ct<nt */
putcode((codeint)ct);
putcode((codeint)ntrt);
putcode(nsc_ptr); /* pointer to nsc */
}
}
else
{
putcode(BRANCH); /* brach back to start of scan (NSC) */
putcode(nsc_ptr); /* pointer to nsc */
}
}
pulsesequence()
{
/* menu variables */
double slice_str,pe_length,read_str,power,angle,TR,TIR,slice_coffset;
double trim_read,trim_slice,freqir,encode_on,read_on,ir_on,sel_crush;
/* internal variables */
double pe_length_eff,GPmin,GPstep;
double aq_time,area_readout,read_rephase_str,GRR,GRead,freqreadout;
double slice_rephase_str,area_slice,GSR,GSS,GCR2,grad_factor;
double time[5],cycle_time,start_cycle[20],relaxation,finish_time;
double powir,powexcite,sel_length,pe_step,pe_min;
double slice_offset[128],GCR1,ir_str;
double B1_90,B1_excite,extra_TE;
double rf_max,ir_len,cur_angle,ramp_lenr,ramp_lens;
int a;
read_str = getval("Read_Str");
slice_str = getval("Slice_Str");
pe_length = getval("PE_length");
ir_str = getval("IR_Grad_Str");
sel_crush = getval("Sel_Crush");
ramp_lenr = getval("ramp_lenr");
ramp_lens = getval("ramp_lens");
extra_TE = getval("extra_TE");
TIR = getval("TIR");
TR = getval("TR");
power=getval("Power");
angle = getval("angle");
trim_slice = getval("Slice_Trim");
trim_read = getval("Read_Trim");
freqreadout = getval("Read_Offset");
freqir = getval("IR_Offset");
encode_on=getval("encode_on");
read_on=getval("read_on");
ir_on=getval("ir_on");
/* rf_max = getval("rf_max"); */
ir_len = getval("ir_len");
cur_angle = getval("cur_angle");
/* rf length calculation and offset lists #0*/
sel_length = 0.003*(1000.0/(slice_str*thk));
for (a=0;a<ns;a++)
{
slice_offset[a] = pss[a]* 10.0 * slice_str;
}
GCR2 = sel_crush * HZ_TO_GAUSS;
GSS = slice_str * HZ_TO_GAUSS;
/* phase encoding */
pe_length_eff = (2.0/3.14159)*pe_length;
pe_step = 1.0/(lpe*10.0*pe_length_eff);
pe_min = pe_step*(nv/2);
GPmin = pe_min * HZ_TO_GAUSS;
GPstep = -pe_step * HZ_TO_GAUSS;
/* rephase for readout */
aq_time = at;
grad_factor = sw/((double)read_str*lro*10.0);
area_readout = (0.001 + (ramp_lenr*0.001/2.0) + (aq_time/2)) * read_str*grad_factor;
read_rephase_str = -1.0*area_readout/pe_length_eff;
GRR = read_rephase_str * HZ_TO_GAUSS * trim_read;
GRead = read_str * HZ_TO_GAUSS*grad_factor;
/* rephase the slice */
area_slice = ((sel_length/2) + (ramp_lens*0.001/2.0))*slice_str;
slice_rephase_str = -1.0*area_slice/pe_length_eff;
GSR = slice_rephase_str * HZ_TO_GAUSS*trim_slice;
/* calculate the rf levels */
B1_90 = (slice_str*thk/1000.0)* B1_SINC3S;
B1_excite = B1_90*(cur_angle/90.0);
powexcite = (B1_excite/1000.0)*4096.0;
powir = 4096.0;
/* calculate the timing */
if (ir_on==1)
time[0] = 0.011 + ir_len*0.001 + 0.0001;
else
time[0] = 0.0001;
/* ir */
time[1] = sel_length + (2*ramp_lens*0.001) + 0.001; /* slice select */
time[2] = extra_TE+ pe_length; /* phase encoding etc. */
time[3] = aq_time + (2*ramp_lenr*0.001)+0.001; /* acquisition window */
time[4] = pe_length; /* rewind */
cycle_time = time[1]+time[2]+time[3]+time[4];
/* printf("\nCycle Time = %f",cycle_time); */
create_offset_list(slice_offset,ns,OBSch,0);
/*
for (a=0;a<ns;a++)
printf("\nOffset %d = %f",a,slice_offset[a]);
*/
GCR1 = ir_str * HZ_TO_GAUSS;
if (ir_on==1)
start_cycle[0] = 0.011 + TIR;
else
start_cycle[0] = 0.0001;
finish_time = start_cycle[0] + (ns*ne*cycle_time);
/* printf("\n Finish Time = %f",finish_time); */
relaxation = TR - finish_time;
/* START THE PULSE SEQUENCE */
assign(v10,zero);
assign(v11,zero);
initval(ne,v7);
status(A);
obspower(power);
/* begin phase encode loop */
peloop(seqcon[2],nv,v1,v2);
delay(relaxation);
/* ir */
obspwrf(powir);
obsoffset(freqir);
if (ir_on==1)
{
shaped_pulse("HYPSEC4",ir_len*0.001,v10,rof1,rof2);
obl_shapedgradient("","CRUSH","",0.011,0,GCR1,0,1,WAIT);
zero_all_gradients();
delay(TIR-0.011);
}
delay(0.0001);
loop(v7,v8); /* loop over T1 times measured */
msloop(seqcon[1],ns,v5,v6); /* loop over slices */
/* slice selection readout */
obspwrf(powexcite);
voffset(0,v6);
obl_shapedgradient("","","RAMPUP",ramp_lens*0.001,0,0,GSS,1,WAIT);
obl_shapedgradient("","","CONST",sel_length+0.001,0,0,GSS,1,NOWAIT);
delay(0.001);
shaped_pulse("SINC3S",sel_length,v11,rof1,rof2);
obl_shapedgradient("","","RAMPDN",ramp_lens*0.001,0,0,GSS,1,WAIT);
zero_all_gradients();
delay(extra_TE);
/* encode and rephasing */
if ((read_on==1)&&(encode_on==1))
pe3_shapedgradient("SINUSOID",pe_length,GRR,GPmin,GSR,0,GPstep,0,zero,v2,zero);
if ((read_on!=1)&&(encode_on==1))
pe3_shapedgradient("SINUSOID",pe_length,0,GPmin,GSR,0,GPstep,0,zero,v2,zero);
if ((read_on!=1)&&(encode_on!=1))
pe3_shapedgradient("SINUSOID",pe_length,0,0,GSR,0,0,0,zero,zero,zero);
if ((read_on==1)&&(encode_on!=1))
pe3_shapedgradient("SINUSOID",pe_length,GRR,0,GSR,0,0,0,zero,zero,zero);
zero_all_gradients();
/* readout */
obsoffset(freqreadout);
if (read_on==1)
{
obl_shapedgradient("RAMPUP","","",ramp_lenr*0.001,GRead,0,0,1,WAIT);
obl_shapedgradient("CONST","","",at+0.001,GRead,0,0,1,NOWAIT);
delay(0.001);
acquire(np,1.0/(sw));
obl_shapedgradient("RAMPDN","","",ramp_lenr*0.001,GRead,0,0,1,WAIT);
zero_all_gradients();
}
else
{
delay(0.001);
acquire(np,1.0/(sw));
}
/* rewind and crush */
if (encode_on==1)
{
pe3_shapedgradient("SINUSOID",pe_length,0,-GPmin,GCR2,0,-GPstep,0,zero,v2,zero);
zero_all_gradients();
}
else delay(pe_length);
endmsloop(seqcon[1],v6);
endloop(v8);
endpeloop(seqcon[2],v2);
}
pulsesequence()
{
double predelay,seqtime,glimit,gshimlim;
double gbasex,gbasey,gbasez,del;
double shimno;
double gdaclim,shimscale;
double delx,dely,delz;
del = getval("del");
gbasex = getval("gbasex");
gbasey = getval("gbasey");
gbasez = getval("gbasez");
shimno = getval("shimno");
shimscale = getval("shimscale");
gshimlim = getval("gshimlim"); /* shim dac limit */
gdaclim = gshimlim*shimscale; /* gradient dac limit */
// initparms_sis();
initval(1, v1); /* no of complex point segments to acquire */
seqtime = at+pw+rof1+rof2+te+(2*trise);
predelay = tr - seqtime; /* predelay based on tr */
if (predelay <= 0.0) {
abort_message("%s: TR too short. Min TR = %f ms",seqfil,seqtime*1e3);
}
/* check if shim limit is exceeded */
if(shimno > 0) {
glimit = abs(del)+abs(gbasex);
if((glimit > gshimlim) || (glimit >= 1600))
abort_message("X shim limit exceeded, %5.0f %5.0f %5.0f %5.3f", glimit,gshimlim,del,shimscale);
glimit = abs(del)+abs(gbasey);
if((glimit > gshimlim) || (glimit >= 1600))
abort_message("Y shim limit exceeded, %5.0f", glimit);
glimit = abs(del)+abs(gbasez);
if((glimit > gshimlim) || (glimit >= 1600))
abort_message("Z shim limit exceeded, %5.0f", glimit);
}
delx = 0; dely = 0; delz = 0;
if(shimno == 1) delx = del;
if(shimno == 2) dely = del;
if(shimno == 3) delz = del;
settable(t1,4,ph1); /* initialize phase tables and variables */
getelem(t1,ct,v7); /* 90 deg pulse phase */
settable(t4,4,phr);
getelem(t4,ct,oph); /* receiver phase */
initval(1,v3);
initval(1,v4);
initval(1,v5);
initval(ssc,v6);
assign(zero,v2);
status(A);
rotate();
obspower(tpwr);
delay(4e-6);
loop(v6,v8); /* steady state dummy scans */
delay(2*trise);
delay(predelay);
pulse(pw,v7);
delay(te);
delay(at);
endloop(v8);
loop(v1,v2); /* compressed acqn not used */
sub(v2,v3,v9); /* v9-v11 not used */
assign(zero,v10);
assign(zero,v11);
gradient('x',gbasex+delx);
gradient('y',gbasey+dely);
gradient('z',gbasez+delz);
delay(trise);
delay(predelay);
pulse(pw,v7);
delay(te);
startacq(alfa);
acquire(np,1.0/sw);
endacq();
endloop(v2);
delay(trise);
zero_all_gradients();
}