What special photos are commonly used? What is the main purpose of each?

⑴ Tomography: Ordinary X-rays are overlapping images of all structures in the irradiated area, and tomography can obtain the image of the tissue structure of a selected layer through special devices and operations, while the structures that do not belong to the selected layer are blurred in the projection process. Tomography is mainly used to: ① identify lesions that are difficult to display and overlap on plain films. ② Observe the cavity, calcification and margin of the tumor. ③ Check bronchial stenosis, occlusion or dilatation. ④ Observe the structural and pathological changes of the selected slices with contrast examination. At present, the function of tomography has been largely replaced by CT.

⑵ Soft line photography: Soft tissue photography adopts soft rays emitted by molybdenum target X-ray arm, which is mainly used for mammography.

⑶ Fluorescence photography: Imaging based on perspective and microfilm, also known as fluorescence microfilm or indirect photography, is mainly used for health screening at present.

⑷ Recording wave photography: Recording wave photography device is used to capture the motion waveforms of the heart, great vessels, diaphragm and other moving organs and observe their activity functions.

5. Magnifying photography: Micro-focus and increasing the distance between human body and photos to show subtle lesions have been replaced by CT.