YY/T 0706-2017Particular specifications for mammographic X-ray equipment (English PDF)

3.2 Compression device

A special device for compressing the breast on a mammary machine, including a compression plate, a patient support, and a device for controlling compression movement. A transparent plate on the mammary machine that is used to compress the patient's breast.

3.4 Average gland dose averageglandulardose; AGD

Using the prescribed calculation method, the average absorption of the breast gland tissue (excluding the skin) whose known composition is uniformly compressed is calculated. dose. A physical quantity that describes the ability of a system to distinguish between different contrast objects and the inherent noise of an image in a digital image.

3.6 Artifact

A structure that is clearly visible on an image. It does not reflect the internal structure of the object, nor can it be explained by noise or system modulation transfer functions. [GB/T 19042.2-2005, definition 3.3.1]

3.7 Afterimage erasurethoroughness

Part of the previous image that was generated in the subsequent image due to incomplete signal removal after the previous image signal was read All.

3.8 Unprocessed image

After pixel defect correction and field correction, the image is not post-image processed.

4.1 Classification

4.1.1 According to the product structure, it can be divided into fixed and mobile mammography machines.

4.1.2 According to the image data output format, it can be divided into screen (analog) and digital mammography.

4.2 Composition

The mammography machine should have at least the following main components.

a) X-ray generating device;

b) the projection frame;

c) compression device;

d) image receiving device;

e) Breast image acquisition workstation (for digital mammography).

5.1 Working conditions

5.1.1 Environmental conditions

Unless otherwise specified, the working environment of the mammary machine should meet.

a) Ambient temperature. 10 ° C ~ 40 ° C;

b) Relative humidity. 30%~75%;

c) Atmospheric pressure. 700hPa~1060hPa.

5.1.2 Power conditions

The manufacturer shall state in the random document the power conditions used for the product, and the operating power conditions shall satisfy.

a) power supply voltage and number of phases. specified by the manufacturer, the network voltage fluctuations should not exceed ± 10% of the nominal value;

b) Power frequency. 50Hz ± 1Hz;

c) Power supply resistance. It should meet the requirements of 10.2.2 of GB 9706.24-2005;

d) Power supply capacity. specified by the manufacturer.

5.2 Electric power

5.2.1 Maximum output electric power

The mammography machine should specify the corresponding combination of X-ray tube voltage and X-ray tube current that results in the maximum output electrical power.

5.2.2 Nominal electric power

It should be specified in kilowatts (kW) that the X-ray generator can provide when the loading time is 0.1 s and the X-ray tube voltage is 30 kV.

The unit's maximum constant electrical power output is given as the nominal electrical power. If this value cannot be pre-selected, the X shot closest to 30kV can be used.

The line voltage value and the closest load time value, but not less than 0.1s.

The nominal electrical power should be given in combination with the X-ray tube voltage and X-ray tube current and load time.

5.3 Loading factor control and display

5.3.1 X-ray tube voltage

5.3.1.1 The mammography machine shall specify the voltage adjustment range and adjustment mode of the X-ray tube. The maximum X-ray tube voltage value shall not exceed 50kV.

5.3.1.2 The manufacturer shall specify the deviation of the voltage value of the X-ray tube, but at least it shall comply with 50.103.1a of GB 9706.24-2005. Claim.

5.3.2 X-ray tube current

5.3.2.1 If the X-ray tube current display is provided, the mammography machine shall specify the X-ray tube current adjustment range and adjustment method.

5.3.2.2 The manufacturer shall specify the deviation of the X-ray tube current value, but at least it shall comply with the requirements of 50.103.2 of GB 9706.24-2005.

5.3.3 Loading time

5.3.3.1 If the loading time display is provided, the mammography machine shall specify the loading time adjustment range and adjustment method.

5.3.3.2 The manufacturer shall specify the deviation of the load time value, but at least it shall comply with the requirements of 50.103.3 of GB 9706.24-2005.

5.3.4 Current time product

5.3.4.1 If the current time product is displayed, the mammography machine shall specify the current time product adjustment range and adjustment mode.

5.3.4.2 The manufacturer shall specify the deviation of the current time product value, but at least it shall comply with the requirements of 50.103.4 of GB 9706.24-2005.

5.3.5 Anti-overload

The mammography machine should have anti-overload measures to ensure that the loading factor selection does not exceed the rated capacity of the X-ray tube. Should comply with the instruction manual The combination of the maximum load factors given in.

5.3.6 Focus

5.3.6.1 The manufacturer shall specify the nominal value of the X-ray tube assembly.

5.3.6.2 When using the normal exposure mode, the nominal value of the X-ray tube assembly should not be greater than 0.4; when using the magnified photographic exposure mode, X-ray The nominal value of the conduit assembly focus should not be greater than 0.2.

5.3.6.3 When multiple focus is provided, the preselected focus shall be displayed prior to exposure, except that the automatic exposure control (AEC) is used to adjust the focus.

5.3.6.4 If the focus is automatically selected, the focus of the actual exposure should be displayed after exposure.

5.3.7 Target surface material

5.3.7.1 The mammography machine shall specify the target surface material used for the X-ray tube.

5.3.7.2 When multiple targets are provided, in addition to using AEC to modulate the target, the preselected target should be displayed prior to exposure.

5.3.7.3 If the target is automatically selected, the actual exposed target should be displayed after exposure.

5.3.8 Additional filtration

5.3.8.1 The mammography machine shall specify the additional filtration used.

5.3.8.2 When multiple filtrations are provided, in addition to using AEC to adjust for additional filtration, a pre-selected additional filtration shall be displayed prior to exposure.

5.3.8.3 If additional filtering is automatically selected, additional filtering of the actual exposure should be displayed after exposure.

5.4 Imaging performance

5.4.1 Automatic Exposure Control (AEC) System

5.4.1.1 The mammography machine shall provide an automatic exposure control (AEC) system.

5.4.1.2 The implementation of the automatic exposure control function should be described in the random file.

5.4.1.3 The repeatability of the digital mammography automatic exposure control is measured by the deviation of the dose or milliampere second, and the deviation value should not be greater than ±5%.

5.4.1.4 The manufacturer shall specify the automatic exposure of the digital mammography machine to different thicknesses of polymethyl methacrylate (PMMA) phantoms. The contrast-to-noise ratio (CNR) minimum of the response.

5.4.2 Artifacts

There should be no visible artifacts.

5.4.3 Afterimage

For digital mammography, the residual coefficient value should be less than 0.3.

5.4.4 Anti-scatter grid

5.4.4.1 The configuration of the anti-scatter grid should be given in the random file (if there is a grid or no gate, moving grid or static grid).

5.4.4.2 There shall be no visible visible shadows within the specified loading time and/or phantom thickness range.

5.4.4.3 When the maximum compressive force is applied to the dynamic grid, the movement of the grid shall not be affected.

5.4.4.4 In the magnification photography mode, the grid should be removed without being left in the radiation beam.

5.4.5 Spatial resolution

5.4.5.1 The spatial resolution of the screen type mammography machine should not be less than 12 lp/mm.

5.4.5.2 The spatial resolution of the digital mammography machine should not be less than 5 lp/mm.

5.4.6 Low contrast resolution

For digital mammography machines, manufacturers should specify low contrast resolution.

5.4.7 Average glandular gland dose

5.4.7.1 The mammography should show the average glandular dose of the mammary gland per irradiation.

5.4.7.2 The digital mammography machine shall display the average gland dose for each captured image.

5.4.7.3 The average gland dose in the normal photography mode of the mammary gland should meet the limits in Table 1.

5.4.8 Digital image uniformity

The maximum deviation of the gray value between the central area and the surrounding area specified by the image receptor shall not exceed ±10%.

5.5 Mechanical performance

5.5.1 Mechanical movement

5.5.1.1 The range of travel of the projection frame in the vertical direction shall be specified, and the deviation of the stroke range shall be less than ± 5%.

5.5.1.2 The angle of rotation of the projection frame and the deviation value shall be specified. The angular deviation value shall be less than ±2°.

5.5.1.3 The projection bracket shall be locked at any position on the full stroke.

5.5.1.4 Focus---The distance of the image receiving surface (FID) should not be less than 600mm.

5.5.1.5 When the power supply is interrupted, the mechanical movement is locked except for the compression plate.

5.5.2 Compression device

5.5.2.1 The pressure should be stable when under pressure, and the pressure value should not exceed 10% within at least 1 min.

5.5.2.2 Where applicable, the equipment is capable of displaying the applied force and its indication value deviation shall be less than ±20N.

5.5.3 Pressure plate

The compression plate shall comply with the relevant requirements of GB 9706.24-2005.

5.5.4 Braking force

The linear motion and the rotational motion part of the mechanical device should have a braking device (the suspension device requires the balancing without the need for braking). Outside), its braking force should not be less than 100N.

5.5.5 Length indication value

The deviation between the indicated value of the length (excluding the compression thickness) and the actual value shall not be greater than ± 5% of the indicated value.

5.5.6 Angle indication value

The deviation of the indicated value of the angle from the actual value is specified by the manufacturer.

5.5.7 Mobile performance of mobile mammography

The human-moving mammography machine moves on a flat concrete floor, and the starting push (pull) force applied to the handlebar should not exceed 250N.

5.5.8 Load bearing

Devices that support adult patients (eg, pedals, chairs, beds) can work properly with 100kg of mass.

5.5.9 Noise

When the mammography machine is running under no-load conditions (non-load-bearing state), the noise generated should not exceed 70dB (A-weighted network) (not including 3s) Non-persistent and aperiodic noise within).

5.6 Software Features

If applicable, the manufacturer shall specify the functionality of the operating software.

5.7 High voltage cable plug and socket

Unless otherwise specified, the requirements for type and basic dimensions, marking, and connection in YY/T 1541 shall be met.

5.8 Appearance

5.8.1 The shape of the mammary machine should be neat and beautiful, the surface should be smooth and smooth, the color should be uniform, and there should be no defects such as scars and cracks.

5.8.2 The main plating parts of the mammography machine shall comply with the requirements of Class 2 appearance in YY 0076-1992.

5.9 Environmental test

Unless otherwise specified, the product shall comply with the requirements of YY/T 0291. The initial, intermediate or final test item shall include at least 5.3.1 a), 5.3.2 a), 5.3.3 a), 5.3.4 a), 5.5.4 (when electrical braking) and 5.6 requirements.

5.10 Safety and Electromagnetic Compatibility Requirements

Should comply with GB 9706.1, GB 9706.11, GB 9706.12, GB 9706.14, GB 9706.15, GB 9706.24 and YY 0505 Claim.

6.1 Test conditions

6.1.1 Environmental conditions

Should comply with the provisions of 5.1.1.

6.1.2 Power conditions

The test power supply conditions for the mammography machine are as follows.

a) The grid voltage and phase number shall comply with the manufacturer's specifications, and the grid voltage fluctuation shall not exceed ± 5% of the nominal value;

b) Power frequency. 50Hz ± 1Hz;

c) The power supply resistance shall comply with the provisions of 5.1.2c);

d) The power supply capacity shall comply with the provisions of 5.1.2d).

6.2 Electric power

6.2.1 Maximum output electric power

Loads are combined according to the loading factors that cause the maximum output power, and the presence or absence of abnormalities is observed.

6.2.2 Nominal electric power

The combination of X-ray tube voltage, X-ray tube current, and loading time leading to the nominal electric power was observed to observe whether there was any abnormality.

6.3 Loading factor control and display

6.3.1 X-ray tube voltage

6.3.1.1 X-ray tube voltage adjustment According to the X-ray tube voltage adjustment range and adjustment method specified in 5.3.1.1, observe the actual operation.

6.3.1.2 The deviation test of the X-ray tube voltage value shall be carried out in accordance with the provisions of 50.104.1 of GB 9706.24-2005.

6.3.2 X-ray tube current

6.3.2.1 X-ray tube current adjustment According to the X-ray tube current adjustment range and adjustment method specified in 5.3.2.1, observe the actual operation.

6.3.2.2 Deviation test of X-ray tube current value shall be carried out in accordance with the provisions of 50.104.2 of GB 9706.24-2005.

6.3.3 Loading time

6.3.3.1 Loading time adjustment According to the loading time adjustment range and adjustment method specified in 5.3.3.1, observe the actual operation.

6.3.3.2 Deviation test of loading time value shall be carried out in accordance with the provisions of 50.104.3 of GB 9706.24-2005.

6.3.4 Current time product

6.3.4.1 Current time product adjustment According to the current time product adjustment range and adjustment method specified in 5.3.4.1, observe the actual operation.

6.3.4.2 The deviation test of current time product shall be carried out in accordance with the provisions of 50.104.4 of GB 9706.24-2005.

6.3.5 Anti-overload

Adjust the parameters of the mammography machine to the maximum load factor combination value specified in the instruction manual, and then adjust any load factor to increase adjacently.

When the gear is added, the loading factor condition is no longer increased or is in an overload state. For mammography machines with continuous adjustment of X-ray tube voltage, anti-overload When the operating voltage value of the device is higher than the X-ray tube voltage value specified in the instruction manual (but not exceeding 5kV), it should not be exposed and the alarm is displayed.

6.3.6 Focus

6.3.6.1 Check the random file check.

6.3.7 Target surface material

6.3.7.1 Check the random file check.

6.3.8 Additional filtration

6.3.8.1 Check the random file check.

6.4 Imaging performance

6.4.1 Automatic exposure control (AEC) system

6.4.1.3 Place a 40mm thick PMMA phantom on the patient support, with the phantom edge aligned with the chest wall side of the patient support; compression plate pressure On the phantom; set the commonly used tube voltage and target/filtering for AEC exposure; repeat exposure 5 times to calculate the current time of each measurement The maximum deviation of the product or dose value from the corresponding mean.

6.4.1.4 Place 20mm, 40mm, 60mm thick PMMA phantoms on the patient support, phantom edge and patient support chest The wall side is aligned, the compression plate is pressed on the phantom, AEC exposure is performed, and the exposure parameters such as tube voltage, current time product and target/filtering are recorded. Will be thick An aluminum sheet having a degree of 0.20±0.01 mm (purity of not less than 99.9% and a size of 30 mm×30 mm) is placed on the upper surface of the PMMA phantom, so that Manual exposure with the same exposure parameters as before (if not exactly the same, the closest exposure parameter is used). When getting each thickness The unprocessed image of the exposure, respectively measuring the area of interest of the area of 400 mm² in the area 2 shown in Fig. 1, the gray value of the aluminum image Mean and standard deviation (mAl, sigmaAl) and an area of interest of 400 mm² in region 1, the mean and standard deviation of the gray value of the background image (mBG, sigmaBG), calculate the CNR value according to equation (1). mBG-mAl sigma2BG sigma2Al (1)

6.4.1.2 Review random files

Note. Automatic exposure control should be provided in one possible combination, for example. with grid, without grid, magnified photography, non-magnified photography and various targets/filters The combination is used to achieve its function; in addition, the probe for measuring the dose should avoid the sensor that affects the AEC.

In the formula. mAl--- is the average value of the gray value of the region 2;

sigmaAl --- is the standard deviation of the gray value of the region 2; mBG--- is the mean value of the gray value of the region 1;

sigmaBG--- is the standard deviation of the grayscale value of the region 1.

Figure 1 Schematic diagram of CNR measurement

6.4.2 Artifacts

a) Screen type mammography machine is carried out according to the provisions of 5.10.2 of GB/T 19042.2-2005.

b) Digital mammography machine, placing a uniform filter plate i...