The ρ parameter is an orientation parameter, representing the mean mineral particle orientation in bone samples. This plug-in calculates the rho parameter from an azimuthal intensity profile as well as the predominant orientation of the mineral particles. Therefore the profile is fitted by two Gaussian profiles and a baseline. The rho parameter is calculated by dividing the peak area (A1 + A2) by the total area (B + A1 + A2).
- Peaks: 2 Peaks is the default. Select 4 Peaks if four peaks are visible in the azimuthal profile.
- 1. Peak Pos.: 0 by default. If not 0, this value is used as start value for fitting the first peak.
- 2. Peak Pos.: 0 by default. If not 0, this value is used as start value for fitting the second peak.
- Note: If there are 4 peaks, one should type the first and second peak position in order to fit the peaks better.
- chi: The chi values of the azimuthal intensity profile.
- I: The intensity values of the azimuthal intensity profile.
- chi_shift: For fitting, the azimuthal profile needs to start at a minimum intensity value. Therefore the whole profile gets shifted before fitting. This is the output for the shifted chi values.
- I_shift: The shifted intensity values.
- I_fit: The fitted (shifted) azimuthal intensity profile.
- rho_param: The rho parameter.
- base_line: The fitted baseline position.
- peak_area: The area of the peaks (A1 + A2).
- back_area: The area under the base line (B).
- fit_param: All fit parameter: [peak(1) position, peak(1) maximum, peak(1) width, peak(2) position, peak(2) maximum, peak(2) width, baseline]