An X-ray device which is especially applicable to the X-ray imaging for child at the age of 0-3 is provided. The X-ray device can use the X-ray tube ( 10 ) which uses the molybdenum target or rhodium target ( 12 ) to produce the soft X-ray by the tube voltage between 25 and 50 kV. The synchronous-exposing equipment contained in the X-ray device may identify the still status and the breath, pulse status suitable for exposure of the child, automatically select the optimal exposing time so that it can acquire a clear X-ray image through only one X-ray exposure, thus prevent the human body from the needless X-ray radiation caused by the multiple X-ray exposures, and also improve the service efficiency of the equipment.
1. An X-ray device, comprising:
an X-ray tube;
a filament;
an anode target surface; and
a filament cage;
wherein a distance between the filament and the anode target surface of the X-ray tube has a range of 13˜15 mm or a distance between the filament cage and the anode target surface of the X-ray tube has a range of 8˜10 mm, which produces X-ray at a tube voltage between 25-50 kV so as to be used in X-ray imaging for child at age of 0-3.
2. The X-ray device of claim 1 , further comprising:
an X-ray filter comprising a metal with 0.5 to 2.5 mm aluminum-equivalent, to filter the X-ray whose energy is low and which is not able to provide clear image so as to output soft X-ray of 25 kV to 50 kV;
wherein the X-ray tube uses a molybdenum target or a rhodium target; and
wherein the X-ray device produces X-ray at the tube voltage of: 25 kV-35 kV suitable for child at age of 0-1; 30 kV-40 kV suitable for child at age of 1-2; 35 kV- 50 kV suitable for child at age of 2-3.
3. The X-ray device of claim 1 , further comprising:
a detecting device to automatically identify status of a subject of a human body and output an exposure start trigger signal when determining that the status of the human body is in a preset still status or a relative stable status according to the identified status of the human body;
a synchronous-exposure controller to perform automatic synchronous-exposure according the trigger signal outputted by the detecting device.
4. The X-ray device of claim 3 , wherein the detecting device includes:
a CCD camera to capture images of the status of the human body;
a real-time image processor to perform a continuous image processing to the images of the status captured by the CCD camera;
a correlation coefficient generating computer to calculate correlation coefficient of the continuous images, and generate a trigger signal when the correlation coefficient of the continuous images is higher than a preset value.
5. The X-ray device of claim 3 , wherein the detecting device includes:
a light source to generate visible light or infrared light to irradiate the human body;
an imaging lens to receive light reflected from the human body and form an image of the human body;
a phototube to convert a light signal of the image projected by the imaging lens into an electrical signal;
an amplifying filtering circuit to amplify and filter the electrical signal converted by the phototube for filtering a direct current component to obtain a variation signal of the irradiated image of the human body; and
a comparison and signal forming circuit to compare the obtained variation signal of the irradiated image of the human body with a preset value, and generate a trigger signal subject to signal formation when the variation signal is lower than the preset value.
6. The X-ray device of claim 3 , wherein the detecting device includes:
a transmission source to transmit electromagnetic waves or ultrasonic waves to the human body;
a receiver to receive the waves reflected from the human body and convert the reflected waves into electrical signals;
an amplifying filtering circuit to amplify and filter the electrical signals converted by the receiver for filtering direct current components to obtain variation signals of position status of the human body; and
a comparison determination and signal forming circuit to compare the obtained variation signal of the position status of the human body with a preset value, and generate a trigger signal subject to signal formation when the variation signal is lower than the preset value.
7. The X-ray device of claim 3 , wherein the detecting device includes:
a breath sensor to sense breath status of the human body and form it into electrical signal;
an amplifying filtering circuit to amplify and filter the electrical signal from the breath sensor for filtering a direct current component to obtain a variation signal of the breath status of the human body; and
a comparison determination and signal forming circuit to make a comparison determination to the obtained variation signal of the breath status of the human body, and generate a trigger signal subject to signal formation when determining the variation signal is in a stable breath period according to a set parameter.
8. The X-ray device of claim 3 , wherein the detecting device includes:
a pulse sensor to sense pulse status of the human body and form it into an electrical signal;
an amplifying filtering circuit to amplify and filter the electrical signal from the pulse sensor for filtering a direct current component to obtain a variation signal of the pulse of the human body; and
a comparison determination and signal forming circuit to make a comparison determination to the obtained variation signal of the pulse of the human body, and generate a trigger signal subject to signal formation when determining the variation signal is in a stable pulse period according to a set parameter.
9. The X-ray device of claim 1 , wherein:
two small-bore collimators are disposed respectively on an X-ray outlet along the direction of X-ray radiation and under a table on which a subject of a human body is placed, and a collimation label is disposed on the table so that the X-ray is collimated by the two small-bore collimators and the collimation label.
10. The X-ray device of claim 9 , wherein:
by measuring absorptivities of the X-ray with two different energy I 01 , I 02 passing through bones and soft-tissues and the absorbance attenuated energy I 1 , I 2 , a bone density MB (with unit of g/cm 2 ) is calculated as follows:
M B =( u 1S J 2 −u 2S J 1 )/( u 1S u 2B −u 2S u 1B )
J 1 =ln( I 01 /I 1 ), J 2 =ln( I 02 /I 2 )
where the subscript 1 and 2 represent related values corresponding to the two different incident energy respectively, u B , u S are absorbance attenuated coefficients of the bone B and the soft-tissue S respectively.
11. The X-ray device of claim 1 , further comprising:
an X-ray guard, wherein disposed between an outlet of the X-ray tube and a subject of a human body is an extendable lead protection cavity, which extends to touch the part of the human body being irradiated such that the X-ray only radiates within a range of the part being irradiated, and the other parts are protected from the X-ray by the lead protection cavity.
12. The X-ray device of claim 11 , the X-ray guard further includes:
a cuboid lead shield mask with a top panel removed, which is disposed on the bottom of a table on which the human body is placed, such that the residual X-ray passing through the table are prevented from emitting.
13. A method of X-ray imaging, comprising:
providing an X-ray device, the X-ray device comprising an X-ray tube, a filament, an anode target surface, and a filament cage;
selecting one of a distance between the filament and the anode target surface of the X-ray tube and a distance between the filament cage and the anode target surface of the X-ray tube; and
enabling the X-ray tube to produce X-ray at an X-ray tube voltage between 25-50 kV so as to be used in X-ray imaging for child at age of 0-3;
wherein a range of the distance between the filament and the anode target surface is 13˜15 mm, and a range of the distance between the filament cage and the anode target surface is 8˜10 mm.
14. The method of X-ray imaging of claim 13 , wherein:
an X-ray filter comprising a metal with 0.5 to 2.5 mm aluminum-equivalent is used to filter the X-ray whose energy is low and which is not able to provide clear image so as to output soft X-ray of 25 kV to 50 kV;
wherein the X-ray tube uses a molybdenum target or a rhodium target; and
wherein the X-ray device produces X-ray at the tube voltage of: 25 kV-35 kV suitable for child at age of 0-1; 30 kV-40 kV suitable for child at age of 1-2; 35 kV-50 kV suitable for child at age of 2-3.