高频x线机的特点：

High frequency X-ray machine features:

1、病人的皮肤剂量低：工频机特别是单相全波整流x光机，其高压变压器输出波形是脉动直流，波纹系数为100%，对成像没有任何帮助的软射线成分较多。高频机高压发生器输出波形近似于恒定直流，脉动率非常低，波纹系数<±5%，输出x线的能量单一性大大提高，病人的皮肤剂量大为降低。

1, the skin dose of the patient is low: the power frequency machine, especially the single-phase full wave rectifier X-ray machine, the output waveform of the high-voltage transformer is pulsating DC, and the ripple coefficient is 100%, which has no help for imaging. The output waveform of HF generator is approximately constant, and the pulsation rate is very low. The corrugation coefficient is < 5%. The energy singularity of output X-rays is greatly improved, and the skin dose of the HP generator is greatly reduced.

2、成像质量高：连续线谱的x线，物质对其吸收不遵守指数规律，射线通过物质以后，不仅有光子数量的减少，而且还有光子能量的变化，成像质量较差。而单能窄束x线，物质对其吸收遵守指数规律，射线透过物质以后vvrfgcuq，只有光子数量的减少，没有光子能量的变化，这对于提高成像质量十分有利。

2, the image quality is high: the X-ray spectrum of continuous line spectrum. The absorption of matter does not obey the exponential rule. After passing through matter, the quantity of photon is reduced, and the energy of photon is changed. The quality of imaging is poor. While the single energy narrow beam X-ray, the material absorbs the index law. After passing through the material, vvrfgcuq only reduces the number of photons and does not change the photon energy, which is very beneficial for improving the imaging quality.

3、 输出剂量大：因高频机属恒定直流曝光，故在胶片获得同样黑化度的情况下，高频机的mAs值是工频机的60%。

3, the output dose is large: because the high frequency machine is a constant DC exposure, so the mAs value of the high frequency machine is 60% of the frequency machine when the film gets the same black degree.