YY/T 1537-2017Laser positioning system in radiation therapy—Functional-performance characteristics and test methods (English PDF)

4.3 Laser classification of laser positioning system in radiation therapy... 7

The classification of radiation therapy laser shall not be higher than the 2 M category specified in GB 7247.1-2012.

4.5 Length of laser positioning-line... 7

At a distance of 3 m from the laser emitting window, it shall not be less than 1 m.

4.6 Straightness of laser line... 7

At a distance of 3 m from the laser emitting window, within a range of not less than 1 m, the straightness shall not exceed 0.5 mm.

4.7 Verticality of laser cross positioning-line (if applicable)... 7

At a distance of 3 m from the laser emitting window, the verticality of laser projection cross positioning-line shall not be greater than 0.2 degrees.

4.8 Positioning accuracy of laser positioning system in radiation therapy

4.8.1 Consistency with reference point

The position of laser positioning-line shall be adjustable. After adjusting, the deviation between the indication position and the actual position of reference point shall not exceed ±0.5 mm.

4.8.2 Consistency with reference plane (if applicable)

The following requirements shall be met.

a) The plane formed by laser positioning-line shall be able to identify the scanning plane (such as the imaging plane of CT simulator);

b) The laser positioning system shall be adjustable. After adjusting, the laser positioning-line projected by each laser lamp shall be parallel or coincident or perpendicular to the reference plane.

4.8.3 Mobile positioning accuracy of laser positioning system in mobile

accuracy of laser positioning system in radiation therapy (if applicable)

5.3 Classification of laser positioning system in radiation therapy... 9

TEST according to the methods given in Clause 8 and Clause 9 of GB 7247.1- 2012. It shall meet the requirements of 4.3.

a) Test environment. Ambient illumination shall be between 50 lx~500 lx. Other test environmental conditions shall meet the manufacturer's requirements;

b) Measuring plane. 3 m away from the laser emitting window;

c) Method. MEASURE according to the density distribution method given in 5.1 of GB/T 13739-2011. The measurement result shall meet the requirements of 4.4.

5.5 Length of laser line... 9

At a distance of 3 m from the laser emitting window, MAKE the laser light directly irradiated on the plane; USE a universal measuring tool to measure the line length. It shall meet the requirements of 4.5.

5.6 Straightness of laser line... 9

The test method specified in Method 1 or Method 2 can be selected for testing. Method 1.

a) USE a CCD detector to receive the positioning-line from the laser;

RECORD the position of the peak value; REPEAT sampling 10 times; and OBTAIN the average of the peak position;

b) On a precision guide rail or other equivalent devices, MOVE the detector. The moving spacing distance is 10 cm. REPEAT Step a), until the moving distance is not less than 1 m;

c) FIT the data points to obtain a straight line. The maximum deviation of each point from the straight line shall meet the requirements of 4.6.

Method 2. The coordinate paper is fixed on a vertical surface. The distance between the laser and the coordinate paper is 3 m. The laser line is projected onto the coordinate paper. Within a range of 1 m, on the coordinate paper, the degree of bending of laser line is measured. It shall meet the