How to determine the exposure conditions of X-ray photography?

Exposure conditions should be determined according to power supply, machine performance, organizational structure and pathological state of the projection site, and can be implemented according to the following specific conditions:

(1) Determine the X-ray dose according to the projection position, such as 150 ~ 250m for trunk and abdomen, 100 ~ 200mas for skull, and 10 ~ 50mas for limbs and lungs.

(2) Increase or decrease the kilovolt value according to pathological conditions, such as osteoporosis, pneumothorax and emphysema. , and appropriately reduce the kilovolt value; But for osteoporosis, pleural effusion and pleural hypertrophy, the kilovolt value should be increased.

(3) For people who are heavier or physically strong, mAs should be increased appropriately; Children and the elderly should reduce mAs appropriately.

(4) using metal wire shielding cylinder and metal wire filter to increase the quality; Appropriately; MAs should be added instead of intensifying screen.

(5) For different focal film distances, the values of mAs and KV should be increased or decreased appropriately.

(6) If the fixed part of gypsum is illuminated, the kilovolt value should be increased.

(7) Other factors, such as the photosensitive speed of the film, the sensitizing effect of the sensitizing screen, the old and new developer, the temperature, etc., all have different degrees of influence on the photographic conditions and should be adjusted accordingly.