halflife.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include "include/halflife.h"
#include "include/substitutions.h"

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Functions
char *	hlIsotopeCode (int isotope)
double	hlFromIsotope (char *isocode)
double	hl2lambda (double halflife)
double	hlLambda2factor (double lambda, double frametime, double framedur)
float	hlLambda2factor_float (float lambda, float frametime, float framedur)
char *	hlCorrectIsotopeCode (char *isocode)
int	hlIsotopeFromHalflife (double halflife)
Variables
static char *	isotope_code []
static double	isotope_halflife []

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Function Documentation

double hl2lambda

(

double

halflife

)

Calculates the isotope lambda from specified halflife.

Parameters:

halflife

halflife time value

Returns:

A negative value is returned in case of error.

Definition at line 139 of file halflife.c.

References M_LN2.

char* hlCorrectIsotopeCode

(

char *

isocode

)

Check that isotope code, e.g. F-18, is in valid format, containing '-' and in this order. Returns the correct isotope code.

Parameters:

isocode

Pointer to string "C-11", "11c" etc; contents of this string is not changed, and this is not returned in any case

Returns:

pointer to correct isotope code, and NULL if it was not valid and could not be corrected.

Definition at line 196 of file halflife.c.

References isotope_code.

Referenced by hlFromIsotope().

double hlFromIsotope

(

char *

isocode

)

Identify the isotope from the specified isotope code string and return the halflife (min). This function checks the validity of the isotope string using hlCorrectIsotopeCode(), but does not change it in any way.

Parameters:

isocode

Pointer to string "C-11", "18f" etc. This argument is not changed

Returns:

A negative value is returned in case of error.

Definition at line 113 of file halflife.c.

References hlCorrectIsotopeCode(), isotope_code, and isotope_halflife.

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char* hlIsotopeCode

(

int

isotope

)

Isotope code as a string, based on isotope list number.

Parameters:

isotope

index of PET isotope in the list in halflife.c

Returns:

pointer to static string or "unknown".

Definition at line 93 of file halflife.c.

References isotope_code.

int hlIsotopeFromHalflife

(

double

halflife

)

Identify the isotope based on its halflife (in minutes).

Parameters:

halflife

Half-life in minutes

Returns:

the isotope list number, or negative value if not identified.

Definition at line 250 of file halflife.c.

References isotope_halflife.

double hlLambda2factor	(	double	lambda,
		double	frametime,
		double	framedur
	)

Calculate the decay correction factor for specified isotope lambda.

Parameters:

lambda	Negative lambda removes decay correction
frametime	Frame start time, or mid time if framedur<=0
framedur	If unknown, set <0 and give mid time for frametime

Returns:

A negative value is returned in case of error.

Definition at line 153 of file halflife.c.

float hlLambda2factor_float	(	float	lambda,
		float	frametime,
		float	framedur
	)

Calculate the decay correction factor for specified isotope lambda. Version for floats (mainly image data).

Parameters:

lambda	Negative lambda removes decay correction
frametime	Frame start time, or mid time if framedur<=0
framedur	If unknown, set <0 and give mid time for frametime

Returns:

A negative value is returned in case of error.

Definition at line 173 of file halflife.c.

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Variable Documentation

char* isotope_code[] [static]

Initial value:

 {
  "Br-75", "Br-76", "Cu-62", "Cu-64", "Fe-52",
  "Ga-68", "Ge-68", "Na-22", "Rb-82", "Zn-62",
  "F-18",  "C-11",  "N-13",  "O-15",  "O-14", "I-124",
0}

Valid isotope codes. Note: when adding isotopes, make sure that all isotopes with one letter are AFTER all two letter isotopes with the same initial letter.

Definition at line 72 of file halflife.c.

Referenced by hlCorrectIsotopeCode(), hlFromIsotope(), and hlIsotopeCode().

double isotope_halflife[] [static]

Initial value:

 {
  HL_Br75, HL_Br76, HL_Cu62, HL_Cu64, HL_Fe52,
  HL_Ga68, HL_Ge68, HL_Na22, HL_Rb82, HL_Zn62,
  HL_F18,  HL_C11,  HL_N13,  HL_O15,  HL_O14, HL_I124,
  0.0
}

Isotope half-lives in minutes

Definition at line 78 of file halflife.c.

Referenced by hlFromIsotope(), and hlIsotopeFromHalflife().