CSlopeStatistics Class Reference

Runs some statistics over a one-dimensional curve. More...

#include <mia/core/slopestatistics.hh>

Public Types
enum	EEnergyCenterpos { ecp_none = 0, ecp_begin, ecp_center, ecp_end }

Public Member Functions
	CSlopeStatistics (const std::vector< float > &series, int index)
	CSlopeStatistics (const CSlopeStatistics &other)=delete
float	get_curve_length () const
float	get_energy () const
std::pair< size_t, float >	get_first_peak () const
std::pair< size_t, float >	get_gradient_peak (int start_movement) const
int	get_index () const
float	get_level_change (size_t center) const
const std::vector< float > &	get_level_coefficient_sums () const
const std::vector< EEnergyCenterpos > &	get_level_mean_energy_position () const
int	get_max_frequency_slot () const
float	get_maximum_gradient_from_zero () const
CSlopeStatistics::EEnergyCenterpos	get_mean_energy_position () const
float	get_mean_frequency () const
float	get_mean_frequency_level () const
std::pair< int, int >	get_peak_level_and_time_index () const
float	get_peak_wavelet_coefficient () const
std::pair< size_t, float >	get_perfusion_high_peak () const
float	get_positive_time_mean () const
float	get_range () const
std::pair< size_t, float >	get_second_peak () const
float	get_wavelet_energy () const
	~CSlopeStatistics ()

Detailed Description

Runs some statistics over a one-dimensional curve.

Evaluates some statistics about a one-dimensional mapping [0, 1,..., N-1] -> R. This is mostly used for myocardial perfusion analysis.

Definition at line 39 of file slopestatistics.hh.

Member Enumeration Documentation

EEnergyCenterpos

enum CSlopeStatistics::EEnergyCenterpos

Ths enumerate is used to identify the time position of the movement

Enumerator
ecp_none	no identifictaion
ecp_begin	movement only beginning of sequence
ecp_center	movement throuout the sequence or only in the middle
ecp_end	movement only end of sequence

Definition at line 44 of file slopestatistics.hh.

Constructor & Destructor Documentation

CSlopeStatistics() [1/2]

CSlopeStatistics::CSlopeStatistics	(	const std::vector< float > &	series,
		int	index
	)

Initialize the statistice with the data of a curve

Parameters

series
index	colum index of the series

CSlopeStatistics() [2/2]

CSlopeStatistics::CSlopeStatistics ( const CSlopeStatistics &  other )

delete

The copy constructor is not allowed

~CSlopeStatistics()

CSlopeStatistics::~CSlopeStatistics

(

)

Member Function Documentation

get_curve_length()

float CSlopeStatistics::get_curve_length

(

)

const

Returns

the curve length evaluated discretly, i.e. taking the \(\Delta\) x = 1 into account

get_energy()

float CSlopeStatistics::get_energy

(

)

const

Returns

the sum of the mean of the norms of the positive terms of the FFT of this curve

get_first_peak()

std::pair<size_t, float> CSlopeStatistics::get_first_peak

(

)

const

Returns

index and value for the minimum or the maximum (whichever has a lower index) of the curve

get_gradient_peak()

std::pair<size_t, float> CSlopeStatistics::get_gradient_peak

(

int

start_movement

)

const

Parameters

start_movement

indicates the first index where a movement in the series starts. The part after this time point will be ignored in the gradinet evaluation

Returns

index and value for the maximum gradient of the curve

get_index()

int CSlopeStatistics::get_index

(

)

const

Returns

the index of this slope as it was stored

get_level_change()

float CSlopeStatistics::get_level_change

(

size_t

center

)

const

Evaluate the change in mean from before the indicated center to the mean after the indicated center. The value at the specified center is ignored.

Parameters

center

balance point to evaluate change

Returns

difference in means

get_level_coefficient_sums()

const std::vector<float>& CSlopeStatistics::get_level_coefficient_sums

(

)

const

Returns

the sums of the absolute coefficient values per wavelet frequency level

get_level_mean_energy_position()

const std::vector<EEnergyCenterpos>& CSlopeStatistics::get_level_mean_energy_position

(

)

const

Returns

a vector containing the time point of identification of main movement

get_max_frequency_slot()

int CSlopeStatistics::get_max_frequency_slot

(

)

const

Returns

the index of the maximum frequency energy slot

get_maximum_gradient_from_zero()

float CSlopeStatistics::get_maximum_gradient_from_zero

(

)

const

Returns

the maximum value f(x)/x for this slope. This indicates the relation between the absolute value of the first intensity peak and its position in time. The larger the earlier in time and the higher.

get_mean_energy_position()

CSlopeStatistics::EEnergyCenterpos CSlopeStatistics::get_mean_energy_position

(

)

const

Returns

the mean of the movement positions over all frequency levels

get_mean_frequency()

float CSlopeStatistics::get_mean_frequency

(

)

const

Returns

the mean of the norms of the positive terms of the FFT of this curve

get_mean_frequency_level()

float CSlopeStatistics::get_mean_frequency_level

(

)

const

Returns

the mean frequency level based on a Wavelet analysis

get_peak_level_and_time_index()

std::pair<int, int> CSlopeStatistics::get_peak_level_and_time_index

(

)

const

Returns

the level and the time index of the wavelet conefficient with the largest absolute value

get_peak_wavelet_coefficient()

float CSlopeStatistics::get_peak_wavelet_coefficient

(

)

const

Returns

the absolute value of the peak wavelet coefficient

get_perfusion_high_peak()

std::pair<size_t, float> CSlopeStatistics::get_perfusion_high_peak

(

)

const

Returns

index of the global maximum if the curve is shifted to start at zero and raises first

get_positive_time_mean()

float CSlopeStatistics::get_positive_time_mean

(

)

const

Returns

mean time position of the first positive slope region

Remarks

experimental means to identify LV/RV enhancement slopes

get_range()

float CSlopeStatistics::get_range

(

)

const

Returns

the absolute range of the curve - i.e. max(series) - min(series)

get_second_peak()

std::pair<size_t, float> CSlopeStatistics::get_second_peak

(

)

const

Returns

index and value for the minimum or the maximum (whichever has a higher index) of the curve

get_wavelet_energy()

float CSlopeStatistics::get_wavelet_energy

(

)

const

Returns

the sum of the absolute values of the wavelet coefficient

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The documentation for this class was generated from the following file:

• slopestatistics.hh