What is the principle of molybdenum target inspection?

It is put forward that there is no concept of molybdenum and palladium, and the so-called molybdenum and palladium is actually a myth of molybdenum target. At the same time, by looking at the original entries, we can know that all entries are "molybdenum target shooting" and "molybdenum target shooting device is a special line machine" At the same time, in the doctoral thesis of the Second Military Medical University in 2009, "Systematic evaluation of the diagnostic accuracy of molybdenum target, magnetic resonance and radionuclide imaging and related statistical techniques" [1], only the word molybdenum target was used, which can be confirmed.

Molybdenum target photography is a common examination method in breast disease examination, which can help doctors find and diagnose breast benign and malignant tumors early.

Molybdenum target photography is a kind of soft X-ray, the dose is very weak, and the influence on patients can be ignored, which is basically harmless. Someone made an example. After a woman is photographed by a molybdenum target, the amount of radiation she experiences is equivalent to the amount of radiation she receives from Beijing to new york at high altitude, so it is quite safe.

Principle and detection method of molybdenum and palladium in breast

2 imaging principle editing

Soft X-ray was used to project the breast tissue, and then the breast tissue was sensitized, developed and fixed by film.

3 major equipment editing

1, X-ray tube:

It is the main determinant of obtaining high contrast images of breast.

In general X-ray machine, the anode palladium surface of the bulb tube is tungsten, and the wavelength generated is 0.008-0.03 1 nm, which is a hard ray with short wavelength and strong penetration. However, the wavelength generated by molybdenum and palladium is 0.063-0.07 1 nm, which belongs to soft rays with long wavelength and weak penetration. Rhodium and palladium have wavelengths between them, and their penetrating power is stronger than molybdenum and palladium. The display effect of dense glands is better than that of molybdenum and palladium.

Molybdenum target photography device is a special wire machine. The tube voltage of the bulb tube is relatively low, about 20 ~ 40 kV, and the anode target surface is made of molybdenum (some high-grade breast implants are made of molybdenum rhodium alloy). Under the bombardment of low kV X-rays, marker rays with constant wavelength, long wavelength, low penetration rate, high intensity, strong monochromaticity and high contrast can be generated, and the resolution of fine density difference of soft tissues is high. Equipped with a special intensifying screen and a photographic film with low linear absorption rate, high contrast and good definition, a good breast image can be obtained by multi-directional photography of breast tissue on a special examination frame, which clearly shows glands, ducts, fibrous septa, skin, subcutaneous tissue, vascular structure, pathological masses and fine calcification of breast.

2. Breast compression device

1), and appropriate compression can reduce the contrast of scattered light to the detected object;

2), reduce the breast movement, make the structure in the breast closer to the intensifying screen-film, and reduce the image blur.

Step 3 check

Reduce scattered rays and improve breast contrast.

4. Console