Parameters of X-ray ball tubes

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