Systems and methods for selecting a desired quantity of follicular units
Systems and methods for selecting follicular units in a distribution of follicular units are provided. A selection parameter, such as a distance-related parameter separating the follicular units to be selected, may be used to determine a desired quantity of follicular units to be selected, such as a desired percentage of follicular units to be selected, and to help provide a substantially uniform distribution of selected follicular units. In addition, a characteristic parameter, such as a characteristic distance or characteristic density, may be determined. The characteristic parameter may be used in determining the desired quantity of follicular units to be selected and or may be used for treatment purposes.
1. A method of calculating a characteristic parameter of follicular units from follicular unit distribution data, the method comprising:
for a set of selected follicular units, calculating, with a processor, an average value of a parameter between a selected follicular unit and a set of closest neighboring follicular units to establish a set of average values; and
calculating, with the processor, the characteristic parameter as the average of the set of average values.
2. The method according to claim 1 , wherein the follicular unit distribution data comprises an image of a body surface or follicular unit coordinate data obtained by physical measurement, digital image processing, or a combination of physical measurement and digital image processing.
3. The method according to claim 1 , further comprising:
converting the characteristic parameter into a density to establish a characteristic density of the follicular units.
4. The method according to claim 1 , further comprising:
determining a density of individual hair follicles.
5. The method according to claim 1 , wherein the step of calculating the average value of the parameter between the selected follicular unit and the set of closest neighboring follicular units is performed for a sub-set of the selected follicular units corresponding to a sub-set of the follicular unit distribution data.
6. The method according to claim 1 , further comprising:
calculating a standard deviation of the set of average values; and
excluding from the step of calculating the characteristic parameter any average value exceeding an acceptable threshold value.
7. The method according to claim 1 , wherein the set of closest neighboring follicular units comprises at least three closest neighboring follicular units.
8. The method according to claim 1 , further comprising:
harvesting follicular units based on the characteristic parameter.
9. The method according to claim 1 , further comprising:
determining implantation sites based on the characteristic parameter such that follicular units to be implanted and existing follicular units approximate an original hair density.
10. The method according to claim 1 , further comprising:
selecting the characteristic parameter as a selection parameter to be used for selecting follicular units in a distribution of follicular units;
determining a quantity of follicular units to be selected in the distribution of follicular units based on a value of the selection parameter; and
iteratively selecting a different value as the value of the selection parameter and repeating the determining step until the value of the selection parameter yields a desired quantity of follicular units to be selected in the distribution of follicular units.
11. The method according to claim 1 , wherein the characteristic parameter is a distance or distance-related.
12. A method of calculating a characteristic parameter of follicular units from follicular unit distribution data, the method comprising:
for a set of selected follicular units in a distribution of follicular units, calculating, with a processor, an average value of a parameter between a selected follicular unit and a set of closest neighboring follicular units to establish a set of average values;
calculating an average of the set of average values to establish a characteristic parameter of follicular units; and
selecting, based on the characteristic parameter or an original density derived therefrom, implantation sites on a body surface or follicular units to be harvested from the distribution of follicular units.
13. A system for calculating a characteristic parameter of follicular units from follicular unit distribution date, the system comprising:
an interface configured to receive follicular unit distribution data reflecting locations of follicular units on a body surface;
one or more modules comprising instructions for calculating, for a set of selected follicular units, an average value of a parameter between a selected follicular unit and a set of closest neighboring follicular units to establish a set of average values; and
one or more modules comprising instructions for calculating a characteristic parameter as the average of the set of average values.
14. The system according to claim 13 , further comprising instructions for converting the characteristic parameter into a density to establish a characteristic density of the follicular units, and for calculating a standard deviation parameter of the set of average values and excluding any average value exceeding an acceptable threshold value when calculating the characteristic parameter.
15. The system of claim 13 , further comprising an image acquisition device for acquiring images or data.
16. The system according to claim 13 , further comprising instructions for:
selecting the characteristic parameter as a selection parameter to be used for selecting follicular units in a distribution of follicular units, determining a quantity of follicular units to be selected in the distribution of follicular units based on a value of a selection parameter, and iteratively selecting a different value as the value of the selection parameter and repeating the determining step until the value of the selection parameter yields the desired quantity of follicular units to be selected in the distribution of the follicular units.
17. The system of claim 16 , wherein the value of the selection parameter further compensates for missing or undetected follicular units.
18. The system of claim 16 , wherein the desired quantity of follicular units comprises a desired harvest quantity of follicular units or a desired reserve quantity of follicular units to be retained in a donor area after a harvesting procedure.
19. The system of claim 16 , the system further comprising instructions for using the selection parameter which yields the desired quantity of follicular units to determine implantation sites.
20. The system of claim 13 , further comprising instructions to select follicular units that are substantially uniformly distributed in the distribution of follicular units.