Source code for Py3DFreeHandUS.muscles_analysis

# -*- coding: utf-8 -*-
"""
.. module:: muscles_analysis
   :synopsis: module for analyzing image-based muscles properties

"""

import numpy as np

[docs]def MTJlengths(P1, P2, P3): """Calculate muscle-tendon junction (MJT) lengths based on insterion and MJT position. Parameters ---------- P1 : np.ndarray 3-elements array containing 3D coordinates for muscle insertion. P2 : np.ndarray 3-elements array containing 3D coordinates for tendon insertion. P3 : np.ndarray 3-elements array containing 3D coordinates for MJT. Returns ------- dict Dictionary with the following keys: - 'Dmuscle': distance between P1 and P3 - 'Dtendon': distance between P2 and P3 - 'Dcomplex': distance between P1 and P2 - 'DmusclePct': ratio between Dmuscle and Dmuscle + Dtendon - 'DtendonPct': ratio between Dtendon and Dmuscle + Dtendon """ res = {} res['Dmuscle'] = np.linalg.norm(P1 - P3) res['Dtendon'] = np.linalg.norm(P2 - P3) res['Dcomplex'] = np.linalg.norm(P1 - P2) res['DmusclePct'] = res['Dmuscle'] / (res['Dmuscle'] + res['Dtendon']) res['DtendonPct'] = res['Dtendon'] / (res['Dmuscle'] + res['Dtendon']) return res