1、BRITISH STANDARD BS ISO 8600-5:2005 Optics and photonics Medical endoscopes and endotherapy devices Part 5: Determination of optical resolution of rigid endoscopes with optics ICS 11.040.55; 37.020 BS ISO 8600-5:2005 This British Standard was published under the authority of the Standards Policy and
2、 Strategy Committee on 1 August 2005 BSI 1 August 2005 ISBN 0 580 46432 6 National foreword This British Standard reproduces verbatim ISO 8600-5:2005 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee LBI/33, Microscopes, which
3、 has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in t
4、he UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standar
5、ds Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard d
6、oes not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 to 3 and a back cover. The BSI copyright notice displayed in this document indicates when the document
7、was last issued. Amendments issued since publication Amd. No. Date CommentsReference number ISO 8600-5:2005(E) INTERNATIONAL STANDARD ISO 8600-5 First edition 2005-03-15 Optics and photonics Medical endoscopes and endotherapy devices Part 5: Determination of optical resolution of rigid endoscopes wi
8、th optics Optique et photonique Endoscopes mdicaux et dispositifs dendothrapie Partie 5: Dtermination de la rsolution optique des endoscopes optiques rigides BS ISO 8600-5:2005iiiii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodi
9、es (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations
10、, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the IS
11、O/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the
12、member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 8600-5 was prepared by Technical Committee ISO/TC 172, Optics and p
13、hotonics, Subcommittee SC 5, Microscopes and endoscopes. ISO 8600 consists of the following parts, under the general title Optics and photonics Medical endoscopes and endotherapy devices: Part 1: General requirements Part 2: Particular requirements for rigid bronchoscopes Part 3: Determination of fi
14、eld of view and direction of view of endoscopes with optics Part 4: Determination of maximum width of insertion portion Part 5: Determination of optical resolution of rigid endoscopes with optics Part 6: Vocabulary BS ISO 8600-5:2005blank 1 Optics and photonics Medical endoscopes and endotherapy dev
15、ices Part 5: Determination of optical resolution of rigid endoscopes with optics 1 Scope This part of ISO 8600 specifies a test method for determining the optical resolution of endoscopes for type testing. It is applicable to rigid endoscopes with optics designed for use in the practice of medicine
16、for type testing. It is not applicable to endoscopes having a fibre-optic or opto-electronic imaging system. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 working distance d distance between object and distal end of endoscope NOTE For the p
17、urposes of the test specified in this part of ISO 8600, the “object” will be the resolution target specified in 3.1.1. 2.2 optical resolution r(d) maximum number of line pairs per millimetre which can be just perceived at a given working distance d of the endoscope 2.3 angular resolution smallest an
18、gle whose vertex is at the distal window surface of the endoscope at which a line pair at a given working distance d can just be identified; it is calculated as follows: 1 arctan drd 2.4 maximum image height 2.4.1 maximum image height circular field of view radius of the field circle BS ISO 8600-5:2
19、005BS ISO 8600-5:2005 2 2.4.2 maximum image height non-circular field of view radius of a circle which circumscribes the maximum field of view EXAMPLE If the field of view is rectangular, the maximum image height is half of the diagonal. 2.5 on-axis resolution resolution at the centre of the image (
20、optical or angular) 2.6 off-axis resolution resolution at an image point at 70 % of the maximum image height (optical or angular) 3 Test method 3.1 Apparatus 3.1.1 Resolution target, having adequately graduated resolution test patterns arranged at least in two directions, preferably in the horizonta
21、l and vertical direction, in the range of 1 line-pair/mm to 100 line- pairs/mm. 3.1.2 Optical bench/optical rail, with mounting apparatus for endoscope and resolution target. 3.1.3 Video camera, with monitor and video printer or photo camera. 3.1.4 Light source, with a recommended colour temperature
22、 of 3 500 K to 8 000 K, unless the endoscope is specifically designed for a specific wavelength, in which case this specific wavelength should be used. 3.2 Procedure 3.2.1 Mount the endoscope on the optical bench. 3.2.2 Attach the target to a diffusive plate and mount it on the optical bench at the
23、working distance d. Align the target at an angle perpendicular to the endoscopes direction of view. Adjust the suitable test pattern on the target to the image points to be tested (see Figure 1). It is recommended to illuminate the target from behind. 3.2.3 Attach the camera to the endoscope. Adjust
24、 the magnification of the system endoscope/camera to maximize resolution. On-axis and off-axis measurement shall be made at the same focus. It shall be assured that the endoscopes resolution is determined and not the resolution of the camera equipment. 3.2.4 Take a videoprint or a photograph. 3.2.5
25、Determine the on-axis resolution of the endoscope in line-pairs/mm (Point A in Figure 1). Determine the off-axis resolution of the endoscope in line-pairs/mm. For this the image is to be divided into four congruent quadrants, each of them containing one image point to be tested (see 2.6; Points B1 t
26、o B4 in Figure 1). The optical resolution shall be determined for all image points Points B1 to B4. At each image point, the resolution target group that enables the detection of all pattern directions shall be determined. The results of all image points shall be averaged. 3.2.6 Calculate the angula
27、r resolution for both on-axis and off-axis resolution. NOTE Within the depth of focus of the endoscope, the angular resolution does not depend on the distance. BS ISO 8600-5:2005 3 Figure 1 Image points to be tested for optical resolution 4 Test report Any test report resulting from following the te
28、st method described in Clause 3 shall contain at least the following details: a) type of endoscope, manufacturer, catalogue and serial numbers; b) resolution target used; c) distance between target and distal end of endoscope; d) light source used; e) camera equipment used; f) if photo camera has be
29、en used: shutter time, f-number, film type, size of print; g) value of on-axis optical and angular resolution; h) single values and averaged value of off-axis optical resolution and angular resolution; i) laboratory or company carrying out the test; j) name of the testing engineer; k) place and date
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