NL2019019B1 - 3-D scanning system for a body or body part - Google Patents

3-D scanning system for a body or body part Download PDF

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Publication number
NL2019019B1
NL2019019B1 NL2019019A NL2019019A NL2019019B1 NL 2019019 B1 NL2019019 B1 NL 2019019B1 NL 2019019 A NL2019019 A NL 2019019A NL 2019019 A NL2019019 A NL 2019019A NL 2019019 B1 NL2019019 B1 NL 2019019B1
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sensors
body part
scanning system
scanned
lines
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NL2019019A
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Dutch (nl)
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Jochem Weiss Alexander
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Vectory3 B V
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/245—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures using a plurality of fixed, simultaneously operating transducers
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41H—APPLIANCES OR METHODS FOR MAKING CLOTHES, e.g. FOR DRESS-MAKING OR FOR TAILORING, NOT OTHERWISE PROVIDED FOR
    • A41H1/00—Measuring aids or methods
    • A41H1/02—Devices for taking measurements on the human body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A61B5/0062—Arrangements for scanning
    • A61B5/0064—Body surface scanning
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6887—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient mounted on external non-worn devices, e.g. non-medical devices
    • A61B5/6888—Cabins

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Veterinary Medicine (AREA)
  • Surgery (AREA)
  • Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Textile Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

3—D scanning system for a body or body part, com— prising multiple sensors wherein each of the sensors is equipped to scan at least a part of the body or body part, and wherein the sensors connect to a processor for converting 5 the sensory information into a 3—D model of the body or body part, and wherein the sensors are arranged circumferentially around a monitoring space, wherein the monitoring space is equipped to receive the body or body part to be scanned.

Description

Figure NL2019019B1_D0001

Octrooicentrum Nederland © 2019019 (21) Aanvraagnummer: 2019019 © Aanvraag ingediend: 2 juni 2017 © BI OCTROOI (51) Int. CL:Netherlands Patent Office © 2019019 (21) Application number: 2019019 © Application filed: 2 June 2017 © BI OCTROOI (51) Int. CL:

G01B 11/245 (2017.01) A41H 1/02 (2017.01) A61BG01B 11/245 (2017.01) A41H 1/02 (2017.01) A61B

5/00 (2017.01)5/00 (2017.01)

(4^ Aanvraag ingeschreven: (4 ^ Request registered: © Octrooihouder(s): © Patent holder (s): 11 december 2018 December 11, 2018 Vectory3 B.V. te Den Haag. Vectory3 B.V. in The Hague. © Aanvraag gepubliceerd: © Request published: - - © Uitvinder(s): © Inventor (s): Alexander Jochem Weiss te Delft. Alexander Jochem Weiss in Delft. © Octrooi verleend: © Patent granted: 11 december 2018 December 11, 2018 © Gemachtigde: © Authorized representative: © Octrooischrift uitgegeven: © Patent issued: mr. ir. J. van Breda c.s. te Amsterdam. ir. J. van Breda et al. in Amsterdam. 16 april 2019 April 16, 2019

© 3-D scanning system for a body or body part© 3-D scanning system for a body or body part

3-D scanning system for a body or body part, comprising multiple sensors wherein each of the sensors is equipped to scan at least a part of the body or body part, and wherein the sensors connect to a processor for converting the sensory information into a 3-D model of the body or body part, and wherein the sensors are arranged circumferentially around a monitoring space, wherein the monitoring space is equipped to receive the body or body part to be scanned.3-D scanning system for a body or body part, including multiple sensors each of the sensors is equipped to scan at least a part of the body or body part, and the sensors connect to a processor for converting the sensor information into a 3-D model of the body or body part, and the sensors are arranged circumferentially around a monitoring space, the monitoring space is equipped to receive the body or body part to be scanned.

NL Bl 2019019NL Bl 2019019

Dit octrooi is verleend ongeacht het bijgevoegde resultaat van het onderzoek naar de stand van de techniek en schriftelijke opinie. Het octrooischrift komt overeen met de oorspronkelijk ingediende stukken.This patent has been granted regardless of the attached result of the research into the state of the art and written opinion. The patent corresponds to the documents originally submitted.

3-D scanning system for a body or body part3-D scanning system for a body or body part

The invention relates to a 3-D scanning system for a body or body part, comprising multiple sensors wherein each of the sensors is equipped to scan at least a part of the body or body part, and wherein the sensors connect to a processor for converting the sensory information into a 3-D model of the body or body part.The invention relates to a 3-D scanning system for a body or body part, including multiple sensors each of the sensors is equipped to scan at least a part of the body or body part, and the sensors connect to a processor for converting the sensory information into a 3-D model or the body or body part.

Such a 3-D scanning system is known from WO2016/180957. In this known 3-D scanning system a number of segmented sub scans is combined into a complete rough 3-D body model. Overlapping sub scans are for instance fitted into the 3-D body model by a squared fitting process or using other types of interpolation. The scans are executed while the body or body part is rotating, and wherein the sensors assume a fixed position. This system is used for apparel size determination, but is evidently unsuited in applications wherein rotation of the body or body part is not an option. Another disadvantage is that rotating the body or body part, scanning, and processing the scanning results is timeconsuming particularly due to the required rotation of the body or body part.Such a 3-D scanning system is known from WO2016 / 180957. In this known 3-D scanning system a number or segmented sub scans is combined into a complete rough 3-D body model. Overlapping sub scans are for instance fitted into the 3-D body model by a squared fitting process or using other types of interpolation. The scans are executed while the body or body part is rotating, and the sensors assume a fixed position. This system is used for device size determination, but is obviously unsuited in applications regarding rotation or the body or body part is not an option. Another disadvantage is that rotating the body or body part, scanning, and processing the scanning results is time consuming particularly due to the required rotation of the body or body part.

The invention aims to provide a 3-D scanning system that provides a reliable and accurate 3-D model of the body or body part without requirement that the body or body part is rotated. This is particularly desirable for medical applications although this is also interesting for other areas, including apparel size determination. Rotation of the body or body part is for instance not an option when the body or body part is injured and only limited movement is allowable.The invention aims to provide a 3-D scanning system that provides a reliable and accurate 3-D model of the body or body part without a requirement that the body or body part is rotated. This is particularly desirable for medical applications, although this is also interesting for other areas, including apparel size determination. Rotation of the body or body part is for instance not an option when the body or body part is injured and only limited movement is allowable.

The invention further aims to provide a 3-D scanning system which requires a limited amount of scanning time, and is able to provide the 3-D model of the body or body part being scanned after only a single scanning shot.The invention further aims to provide a 3-D scanning system which requires a limited amount of scanning time, and is able to provide the 3-D model of the body or body part being scanned after only a single scanning shot.

The invention is embodied in a 3-D scanning system and in a method for performing a 3-D scan on a body or body part in accordance with one or more of the appended claims.The invention is embodied in a 3-D scanning system and in a method for performing a 3-D scan on a body or body part in accordance with one or more of the appended claims.

In a first aspect of the invention the sensors are arranged circumferentially around a monitoring space, wherein the monitoring space is equipped to receive the body or body part to be scanned. With this arrangement it is possible to collect sufficient information regarding the body or body part to be scanned to build a reliable and accurate 3-D model therefrom.In a first aspect of the invention the sensors are arranged circumferentially around a monitoring space, the monitoring space is equipped to receive the body or body part to be scanned. With this arrangement it is possible to collect sufficient information regarding the body or body part to be a reliable and accurate 3-D model therefrom.

Best results are achieved when the sensors are distant from each other positioned at a predetermined constant distance from a central axis of the monitoring space, which constant distance is the same for each sensor.Best results are achieved when the sensors are distant from each other positioned at a predetermined constant distance from a central axis or the monitoring space, which constant distance is the same for each sensor.

Accordingly it is preferred that the sensors are regularly distributed on a virtual circular line having its middle point on a central axis of the monitoring space.It is preferred that the sensors are regularly distributed on a virtual circular line having its middle point on a central axis of the monitoring space.

Although other options are not excluded it is preferred that the sensors are equidistant with respect to each other .Although other options are not excluded it is preferred that the sensors are equidistant with respect to each other.

In a certain embodiment it is advantageous that the sensors are distributed on four adjacent virtual circular lines, each circular line having its middle point on a central axis of the monitoring space, so as to provide that each of the sensors has a different line of view with respect to the body or body part to be scanned. This improves the reliability and accuracy of the 3-D model of the body or body part even further, which may be particularly helpful in building a 3-D model of a person's limb such as a hand.In a certain embodiment it is advantageous that the sensors are distributed on four adjacent virtual circular lines, each circular line having its middle point on a central axis of the monitoring space, so as to provide that each of the sensors has a different line of view with respect to the body or body part to be scanned. This improves the reliability and accuracy of the 3-D model or the body or body part equally further, which may be particularly helpful in building a 3-D model or a person's limb such as a hand.

Again without excluding other options it is normally preferable that the four adjacent virtual circular lines have a radius which is the same for all four circular lines.Again without excluding other options it is normally preferable that the four adjacent virtual circular lines have a radius which is the same for all four circular lines.

With reference to the application of building a 3-D model of a person's hand it is advantageous that the four adjacent virtual circular lines are positioned in two couples of two circular lines, wherein a distance between the two couples of circular lines is at least three times the distance between the circular lines in a particular couple of circular lines. This makes possible that not only an accurate 3-D model of the hand comes available, but also of the lower arm to which the hand is connected. Particularly in medical applications this information is often required.With reference to the application of building a 3-D model of a person's hand it is advantageous that the four adjacent virtual circular lines are positioned in two couples or two circular lines, where a distance between the two couples or circular lines is at least three times the distance between the circular lines in a particular couple or circular lines. This makes possible that not only an accurate 3-D model of the hand comes available, but also the lower arm to which the hand is connected. Particularly in medical applications this information is often required.

The invention will hereinafter be further elucidated with reference to the drawing of an exemplary embodiment of a 3-D scanning system according to the invention that is not limiting as to the appended claims.The invention will be further elucidated with reference to the drawing of an exemplary embodiment of a 3-D scanning system according to the invention that is not limiting as to the appended claims.

In the drawing:In the drawing:

-figure 1 shows a 3-D scanning system according to the invention; and-figure 1 shows a 3-D scanning system according to the invention; and

-figure 2 shows a part of the 3-D scanning system shown in figure 1.-figure 2 shows a part of the 3-D scanning system shown in figure 1.

Whenever in the figures the same reference numerals are applied, these numerals refer to the same parts.Whenever in the figures the same reference numerals are applied, these numerals refer to the same parts.

In figure 1 the 3-D scanning system of the invention is schematically shown and depicted with reference 1. The scanning system 1 comprises a monitoring device 2, a microprocessor or computer 3, and optionally a visual display unit 4 to show the calculated 3-D model derived from the body or body part received in the monitoring device 2. The monitoring device 2 is equipped with a monitoring space 5 which is capable to receive the body or body part to be scanned. Circumferentially around the monitoring space 5 sensors are provided on a line or a series of lines which are symbolized in figure 1 by a single closed line 6.In figure 1 the 3-D scanning system of the invention is schematically shown and depicted with reference 1. The scanning system 1 comprises a monitoring device 2, a microprocessor or computer 3, and optionally a visual display unit 4 to show the calculated 3- The model derived from the body or body part received in the monitoring device 2. The monitoring device 2 is equipped with a monitoring space 5 which is capable of receiving the body or body part to be scanned. Circumferentially around the monitoring space 5 sensors are provided on a line or a series of lines which are symbolized in figure 1 by a single closed line 6.

Figure 2 provides an isometric view of in particular the monitoring space 5 of figure 1, which further shows as an example a hand 7 which is received in said space to be scanned. Further figure 2 shows that the single closed line 6 of figure 1 represents in a preferable arrangement that there are four adjacent virtual circular lines 6.1; 6.2; 6.3; andFigure 2 provides an isometric view of in particular the monitoring space 5 or figure 1, which further shows as an example of a hand 7 which is received in said space to be scanned. Further figure 2 shows that the single closed line 6 or figure 1 represents a preferable arrangement that there are four adjacent virtual circular lines 6.1; 6.2; 6.3; and

6.4 divided in two couples 8, 9 each having two circular lines. The sensors 10 are positioned on these respective virtual circular lines 6.1; 6.2; 6.3; and 6.4, and their arrangement should be preferably such that one or more of the following conditions are met:6.4 divided into two couples 8, 9 each having two circular lines. The sensors 10 are positioned on these respective virtual circular lines 6.1; 6.2; 6.3; and 6.4, and their arrangement should be preferably such that one or more of the following conditions are with:

- the sensors 10 are distant from each other positioned at a predetermined constant distance from a central axis of the monitoring space 5, which constant distance is the same for each sensor 10.- the sensors 10 are distant from each other positioned at a predetermined constant distance from a central axis or the monitoring space 5, which constant distance is the same for each sensor 10.

- the sensors 10 are regularly distributed on the virtual circular line(s) having its or their middle point on a central axis of the monitoring space 5.- the sensors are regularly distributed on the virtual circular line (s) having their or their middle point on a central axis of the monitoring space 5.

- the sensors 10 are equidistant with respect to each other.- the sensors are equidistant with respect to each other.

Regarding the embodiment shown in figure 2 wherein there are four adjacent circular lines 6.1; 6.2; 6.3; and 6.4 divided in two couples 8, 9 each having two circular lines, it is preferable that a distance d2 between the two couples 8, 9 of circular lines is at least three times the distance dl between the circular lines in a particular couple of circular lines. This provides an effective difference in lines of view of each of the sensors 10 which supports an accurate and reliable 3-D model to be derived from the body or body part to be scanned in the monitoring space 5.Regarding the embodiment shown in figure 2 there are four adjacent circular lines 6.1; 6.2; 6.3; and 6.4 divided into two couples 8, 9 each having two circular lines, it is preferable that a distance d2 between the two couples 8, 9 or circular lines is at least three times the distance dl between the circular lines in a particular couple of circular lines. This provides an effective difference in lines of view of each of the sensors 10 which supports an accurate and reliable 3-D model derived from the body or body part scanned in the monitoring space 5.

The invention makes possible that the 3-D model of the scanned body or body part is instantaneously available after making a single scan with the sensors 10. The operational swiftness of the system even makes possible that a recording in real time can be made of the body or body part.The invention makes possible that the 3-D model of the scanned body or body part is immediately available after making a single scan with the sensors 10. The operational swiftness of the system even makes possible that a real-time recording can be made of the body or body part.

Although the invention has been discussed in the foregoing with reference to an exemplary embodiment of the 3D scanning system of the invention, the invention is not restricted to this particular embodiment which can be varied in many ways without departing from the invention. The discussed exemplary embodiment shall therefore not be used to construe the appended claims strictly in accordance therewith. On the contrary the embodiment is merely intended to explain the wording of the appended claims without intent to limit the claims to this exemplary embodiment. The scope of protection of the invention shall therefore be construed in accordance with the appended claims only, wherein a possible ambiguity in the wording of the claims shall be resolved using this exemplary embodiment.Although the invention has been discussed in the foregoing with reference to an exemplary embodiment of the 3D scanning system of the invention, the invention is not restricted to this particular embodiment which can be varied in many ways without departing from the invention. The discussed example is therefore not used to construct the appended claims strictly in accordance with therewith. On the contrary the embodiment is merely intended to explain the becoming of the appended claims without intent to limit the claims to this exemplary embodiment. The scope of protection of the invention shall therefore be constructed in accordance with the appended claims only, where possible ambiguity in the wording of the claims shall be resolved using this exemplary embodiment.

Claims (14)

CONCLUSIESCONCLUSIONS 1. 3-D Scanning systeem (1) voor een lichaam of lichaamsdeel omvattende meerdere sensoren (10) waarbij ieder van de sensoren (10) is uitgerust voor het scannen van ten minste een deel van het lichaam of lichaamsdeel, waarbij de sensoren (10) verbonden zijn met een processor (3) voor het converteren van de sensorinformatie in een 3-D model van het lichaam of lichaamsdeel, met het kenmerk, dat de sensoren (10) omtreksgewijs rond een opnameruimte (5) zijn aangebracht, waarbij de opnameruimte (5) is uitgerust voor het opnemen van het lichaam of lichaamsdeel dat gescand moet worden.A 3-D Scanning system (1) for a body or body part comprising a plurality of sensors (10), wherein each of the sensors (10) is equipped for scanning at least a part of the body or body part, the sensors (10) ) are connected to a processor (3) for converting the sensor information into a 3-D model of the body or body part, characterized in that the sensors (10) are arranged circumferentially around a recording space (5), the recording space (5) is equipped to receive the body or body part to be scanned. 2. 3-D Scanning systeem volgens conclusie 1, met het kenmerk, dat de sensoren (10) op afstand van elkaar liggen op een vooraf bepaalde constante afstand van een centrale as van de opnameruimte (5), welke constante afstand hetzelfde is voor iedere sensor (10).A 3-D Scanning system according to claim 1, characterized in that the sensors (10) are spaced apart at a predetermined constant distance from a central axis of the recording space (5), which constant distance is the same for each sensor (10). 3. 3-D Scanning systeem volgens conclusie 1 of 2, met het kenmerk, dat de sensoren (10) regelmatig verdeeld zijn aangebracht op ten minste één virtuele cirkellijn (6) welke haar middelpunt bezit op een centrale as van de opnameruimte (5) .3. 3-D Scanning system according to claim 1 or 2, characterized in that the sensors (10) are arranged regularly distributed on at least one virtual circle line (6) which has its center on a central axis of the recording space (5) . 4. 3-D Scanning systeem volgens één der conclusies 1-4. 3-D Scanning system according to one of claims 1- 3, met het kenmerk, dat de sensoren (10) op gelijke afstand ten opzichte van elkaar liggen.3, characterized in that the sensors (10) are equidistant from one another. 5. 3-D Scanning systeem volgens één der conclusies 1-5. 3-D Scanning system according to one of claims 1- 4, met het kenmerk, dat de sensoren (10) verdeeld zijn aangebracht op vier naastliggende virtuele cirkellijnen (6.1; 6.2; 6.3; 6.4), waarbij iedere cirkellijn haar middelpunt bezit op een centrale as van de opnameruimte (5) teneinde te voorzien dat ieder van de sensoren (10) een verschillende zichtlijn bezit met betrekking tot het lichaam of lichaamsdeel dat gescand moet worden.4, characterized in that the sensors (10) are distributed on four adjacent virtual circle lines (6.1; 6.2; 6.3; 6.4), each circle line having its center on a central axis of the receiving space (5) to provide that each of the sensors (10) has a different line of sight with respect to the body or body part to be scanned. 6. 3-D Scanning systeem volgens conclusie 5, met het kenmerk, dat de vier naastliggende virtuele cirkellijnen (6.1; 6.2; 6.3; 6.4) een straal bezitten die gelijk is voor ieder van de vier cirkellijnen.The 3-D scanning system according to claim 5, characterized in that the four adjacent virtual circle lines (6.1; 6.2; 6.3; 6.4) have a radius that is the same for each of the four circle lines. 7. 3-D Scanning systeem volgens conclusie 5 of 6, met het kenmerk, dat de vier naastliggende virtuele cirkellijnen (6.1; 6.2; 6.3; 6.4) in twee koppels (8, 9) van twee cirkellijnen zijn gepositioneerd, waarbij een afstand (d2) tussen de twee koppels (8, 9) van cirkellijnen ten minste driemaal de afstand (dl) bedraagt tussen de cirkellijnen in een bepaald koppel van cirkellijnen.7. 3-D Scanning system according to claim 5 or 6, characterized in that the four adjacent virtual circle lines (6.1; 6.2; 6.3; 6.4) are positioned in two pairs (8, 9) of two circle lines, a distance ( d2) between the two couples (8, 9) of circle lines is at least three times the distance (d1) between the circle lines in a given torque of circle lines. 8. Werkwijze voor het uitvoeren van een 3-D scan op een lichaam of lichaamsdeel omvattende de stap van het voorzien in een serie sensoren (10) en voorzien dat ieder van de sensoren (10) ten minste een deel van het lichaam of lichaamsdeel scant, en voorzien dat informatie van de sensoren (10) verzameld en bewerkt wordt voor het vormen van een 3-D model van het lichaam of lichaamsdeel, gekenmerkt door het omtreksgewijs aanbrengen van de sensoren (10) rond het lichaam of lichaamsdeel dat gescand moet worden.A method for performing a 3-D scan on a body or body part comprising the step of providing a series of sensors (10) and providing that each of the sensors (10) scans at least a part of the body or body part and providing information from the sensors (10) to be collected and processed to form a 3-D model of the body or body part, characterized by circumferentially mounting the sensors (10) around the body or body part to be scanned . 9. Werkwijze volgens conclusie 8, gekenmerkt door het op afstand van elkaar aanbrengen van de sensoren (10) rond het lichaam of lichaamsdeel dat gescand moet worden.A method according to claim 8, characterized by spacing the sensors (10) around the body or body part to be scanned. 10. Werkwijze volgens conclusie 8 of 9, gekenmerkt door het regelmatig verdeeld op ten minste één virtuele cirkellijn (6) aanbrengen van de sensoren (10) rond het lichaam of lichaamsdeel dat gescand moet worden.Method according to claim 8 or 9, characterized by arranging the sensors (10) regularly distributed on at least one virtual circle line (6) around the body or body part to be scanned. 11. Werkwijze volgens één der conclusies 8-10, gekenmerkt door het op gelijke afstand van elkaar aanbrengen van de sensoren (10).A method according to any one of claims 8-10, characterized by arranging the sensors (10) equally spaced apart. 12. Werkwijze volgens één der conclusies 8-11, gekenmerkt door het regelmatig verdeeld rond het lichaam of lichaamsdeel dat gescand moet worden aanbrengen van de sensoren (10) op vier separate en naastliggende virtuele cirkellijnen (6.1; 6.2; 6.3; 6.4) rond het lichaam of lichaamsdeel dat gescand moet worden.A method according to any one of claims 8-11, characterized by regularly distributing the sensors (10) around the body or body part to be scanned on four separate and adjacent virtual circular lines (6.1; 6.2; 6.3; 6.4) around the body or body part to be scanned. 13. Werkwijze volgens conclusie 12, gekenmerkt door het geven van dezelfde straal aan ieder van de virtuele cirkellijnen (6.1; 6.2; 6.3; 6.4) op welke de sensoren (10) zijn aangebracht.A method according to claim 12, characterized by giving the same radius to each of the virtual circle lines (6.1; 6.2; 6.3; 6.4) on which the sensors (10) are mounted. 14. Werkwijze volgens conclusie 12 of 13, gekenmerkt door het aanbrengen van de vier naastliggende virtuele cirkellijnen (6.1; 6.2; 6.3; 6.4) in twee koppels (8, 9) van twee cirkellijnen, en voorzien van een afstand (d2) tussen de twee koppels van cirkellijnen die ten minste driemaal de afstand (dl) bedraagt tussen de cirkellijnen in een bepaald koppel van cirkellijnen.A method according to claim 12 or 13, characterized by arranging the four adjacent virtual circle lines (6.1; 6.2; 6.3; 6.4) in two pairs (8, 9) of two circle lines, and provided with a distance (d2) between the two pairs of circle lines that are at least three times the distance (dl) between the circle lines in a given circle line circle. Fl 4.1Fl 4.1
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