Parameters of X-ray ball tubes

Source: Internet
Author: User

The specifications and parameters of ball tubes include the structure parameters and electrical parameters. The former refers to the various parameters determined by the structure of the ball tube, such as the tilt angle of the target surface, effective focus, shape size, weight, filtration equivalent of the tube wall, anode speed, operating temperature and cooling form. Electrical Parameters refer to the specifications of the electrical properties of the ball tube, such as filament heating voltage and current, maximum tube voltage, tube current, maximum exposure time, maximum allowable power and anode thermal capacity.

1. The maximum pipe voltage refers to the highest voltage peak value added between the pole of the ball tube. This value is determined by the length, shape, type of insulating medium, and form of the tube sleeve. If the maximum pipe voltage is exceeded, the wall may be discharged or broken down. The unit of the pipe voltage is KV ).

2. The tube current is the maximum current average value allowed during a certain tube voltage and exposure time. The unit is milliampere. The rated value shall not be exceeded when adjusting the current of the pipe; otherwise, the focal surface may be overheated and damaged or the filament life may be shortened.

3. the maximum exposure time is the maximum exposure time allowed under the voltage and current conditions of a pipe, in seconds. If this value is exceeded during use, the focal surface will be overheated and damaged due to heat accumulation.

4. The anode thermal capacity refers to the maximum heat that can be stored on the anode.

4.1 anode thermal capacity represents the capacity of X-ray tube core, focus (0.6 ~ 1.2) the heat capacity does not need to be too large, 200khu, 300khu, 400khu, etc. are reasonable; focus (0. 3 ~ 0.8) the hot capacity must be large, and at least 600,700 is reasonable.
The heat capacity of the 4.2 ball tube represents the bearing capacity of the entire tube sleeve, which is related to the heat dissipation curve. The larger the size of the target surface, the more obvious the heat dissipation effect. Basically, the rad is 3-inch and the 4-inch with perspective

5. Large focus/small focus

Under the action of high voltage, the focus track formed on the anode target is called the physical focus. Simply put, the area of the cathode electronic impact on the anode target is called the focus. Focus is also divided into actual focus and effective focus. People usually refer to the effective focus, that is, the nominal focus. Because the target has a certain angle, the nominal focus is the projection of the physical focus perpendicular to the axis of the ball tube. The nominal focus is much smaller than the physical focus.

We often say that 0.6 and 1.2 are only nominal values, not actual lengths. Therefore, the Unit is not mm. The measurement method is specified in iec60336. The focal point is rectangular, which is divided into long axis and short axis. The unit is mm. According to iec60336: 0.6, the maximum width of the 1.2 Focus is 2005, the maximum length is 0.6, the maximum width of the 0.90 focus is 1.30, and the maximum length is 1.2.

Practice has proved that the smaller the focus, the higher the resolution. However, the smaller the focus, the smaller the power to bear. When a large condition (that is, a high power) is required, the smaller focus cannot meet the requirements. In this case, the main contradiction is whether the camera can be shot, therefore, when a small amount of resolution is lost, the focus is increased to meet the requirements.
Generally divided into: Micro focus: less than 0.4mm; smaller focus: less than 1mm, larger focus: greater than 1mm ~ 4mm. microfocal points are usually used as many cardiovascular lesions.

 

6. Ball tube Characteristic Curve

I. Anode characteristic curve: it refers to the relationship between tube voltage U and tube current I under a certain filament heating current.

II filament emission characteristic curve: it refers to the relationship between the pipe current and the filament heating current under a certain tube voltage. Meaning "to adjust the voltage and current of the tube to obtain the quality and quantity of the required X-ray, the space charge must be compensated. Compensation principle: When the tube voltage is high, appropriately reduce the filament heating current, so that the tube current does not change with the tube voltage. Otherwise, the filament heating current is appropriately increased when the pipe voltage is low.

The following table lists the specifications of the Siemens drh ct ball tube 156ct-103ms.

Parameter type Parameter Value
Maximum tube voltage 140kv
Focus size 1.6x1.4
0.1s maximum power 55kw
Maximum filament current and voltage 80a; 14.0 v
Maximum Filament Current during continuous use 40a
Anode Target Angle 0 °
Anode target surface diameter, material 117, rtmc
Anode thermal capacity 1300kj
Maximum Anode Heat Dissipation Rate 270kj/min
Total filtering volume 2.2mm A1/80kv
Maximum Heat Capacity of ball tubes 2200kj
Rotating Anode Drive Power Supply frequency 65Hz
Cooling mode Oil Circulation Air Cooling
Weight 37 kg
Operating Temperature + 10-+ 35 ℃

The following table lists the specification parameters of toshba e7252x.

Parameter type Parameter Value
Maximum tube voltage 150kv
Focus size 1.2/0.6
0.1s maximum power 75/27 kw
Maximum filament current and voltage

5.5a; 12.7 ~ 17.1 v

5.2a; 7.0 ~ 9.4 v

Maximum Filament Current during continuous use  
Anode Target Angle 12 °
Anode target surface diameter, material 74mm. The surface is molybdenum target of tungsten.
Anode thermal capacity 210 kJ (300 khu)
Maximum Anode Heat Dissipation Rate 475 million (667 Hu/s)
Total filtering volume  
Maximum Heat Capacity of ball tubes 900 kJ (1250 khu)
Rotating Anode Drive Power Supply frequency 50/60/180Hz
Cooling mode Natural Cooling or forced cooling
Weight 18 kg
Operating Temperature 10 ~ 40 ℃

 

Toshiba fluoroscopy/shooting X-ray tube list

Model Focus (small/large)
(Mm)
Use
Power Supply
Frequency
(HZ)
Maximum rated power
At 0.1 s (kW)
Maximum current
(Ma)
Maximum voltage
(Kv)
Circuit (2) Angle
(Degree)
Anode Application
Diameter Hot capacity Cooling Power
(W)
Rotation Speed
Mm-1)
(1) r (1) r/F
(KJ) (Khu)
E7239x 1.0/2.0 50 21/42. 5 340/570 125 T, C 16 74 100 140 475 2700  
E7299x 0.3/1.0 50 3.4/35.5 70/640 150 T, C 12 74 100 140 475 2700
E7240x 0.6/1.2 50 14/29 200/500 150 T, C 12 74 100 140 475 2700  
E7242x 0.6/1.5 50 16.5/47 290/800 125 T, C 14 74 142 200 475 2700  
E7843x 0.6/1.2 50 20/46 370/760 150 T, C 12 74 111 150 475 2700  
E7252x 0.6/1.2 50 14/40 300/800 150 T, C 12 74 210 300 475 2700
180 27/75 400/1000 9700
E7813x 1.0/2.0 50 19/42 400/700 150 T, C 16 74 210 300 475 2700
180 35/80 600/1000 9700
E7255fx 0.6/1.2 50 21/55. 5 400/800 150 T, C 12 100 210 300 710 2700
180 40/100 500/1000 9700
E7100x 0.6/1.2 50 21/53 400/800 150 T, C 12 100 210 300 710 2700 (○)
180 40/100 500/1000 9700
E7254fx 0.6/1.2 50 18.5/51 400/800 150 T, C 12 100 285 400 1180 2700
180 40/100 500/1000 9700
Notes
1. R/F: X-ray photography and fluoroscopy R: photography
2. The actual application may vary according to the usage conditions.
3. T: Three-phase full-wave rectification C: constant potential all-ray tube center grounding

 

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