/usr/include/odinseq/seqgradspiral.h is in libodin-dev 1.8.8-2ubuntu1.
This file is owned by root:root, with mode 0o644.
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seqgradspiral.h - description
-------------------
begin : Tue Aug 13 2002
copyright : (C) 2000-2014 by Thies H. Jochimsen
email : thies@jochimsen.de
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef SEQGRADSPIRAL_H
#define SEQGRADSPIRAL_H
#include <tjutils/tjnumeric.h>
#include <odinseq/odinpulse.h>
#include <odinseq/seqgradchan.h>
#include <odinseq/seqgradwave.h>
#include <odinseq/seqgradconst.h>
#include <odinseq/seqgradchanparallel.h>
/**
* @addtogroup odinseq_internals
* @{
*/
/**
* Spiral Gradients
*/
class SeqGradSpiral: public SeqGradChanParallel, public MinimizationFunction {
public:
/**
* Constructs a spiral gradient labeled 'object_label' and the
* following properties:
* - traj: The spiral trajectory (will be modified, if neccessary)
* - dt: The dwell time
* - resolution: Spatial resolution
* - sizeRadial: The number of image points in radial direction
* - numofSegments : The number of spiral interleaves
* - inwards: Reverse trajectory so that the spiral ends in the center of k-space, in addition, rotates trajectory by 180 deg
* - optimize: Optimize trajectory for minimum readout length if trajectory has a free tunable parameter
* - nucleus: The imaging nucleus
*/
SeqGradSpiral(const STD_string& object_label, JDXtrajectory& traj, double dt, float resolution, unsigned int sizeRadial, unsigned int numofSegments, bool inwards=false, bool optimize=false, const STD_string& nucleus="");
/**
* Constructs an empty spiral gradient with the given label.
*/
SeqGradSpiral(const STD_string& object_label = "unnamedSeqGradSpiral" );
/**
* Constructs a spiral gradient which is a copy of 'sgs'
*/
SeqGradSpiral(const SeqGradSpiral& sgs);
/**
* This assignment operator will make this object become an exact copy of 'sgs'.
*/
SeqGradSpiral& operator = (const SeqGradSpiral& sgs);
/**
* Returns the size of the spiral without ramps
*/
unsigned int spiral_size() const {return denscomp.size();}
/**
* Returns the duration of the ramp that switches the gradients off
*/
double get_ramp_duration() const {return (get_gradduration()-spiral_dur);}
/**
* Sets the delay of the gradient delays preceding the spiral gradients
*/
SeqGradSpiral& set_predelay_duration(double dur);
/**
* Returns the Jacobian determinante, i.e. the correction function
* for non-uniform weighting of k-space
*/
const fvector& get_denscomp() const {return denscomp;}
/**
* Returns the k-space trajectory for the interleave 'iseg' and the given channel
*/
fvector get_ktraj(direction channel) const;
private:
void common_init() {traj_cache=0;}
void build_seq();
float readout_npts() const;
// implement virtual functions of MinimizationFunction to minimize readout duration
float evaluate(const fvector& spirpar) const;
unsigned int numof_fitpars() const {return 1;}
SeqGradWave gx;
SeqGradWave gy;
SeqGradDelay gxdelay;
SeqGradDelay gydelay;
fvector kx;
fvector ky;
fvector denscomp;
double spiral_dur;
double predelay;
// cache values for readout_npts/evaluate
JDXtrajectory* traj_cache;
double dt_cache;
float resolution_cache;
unsigned int sizeRadial_cache;
float gamma_cache;
};
//////////////////////////////////////////////////////////////////////////////////////////
/** @}
*/
#endif
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