i have got a bad quality CT, and i wonder anyone have similar experience ?

I have noticed that, sometime if the patient is very Thin, dont have much fat, when i used standard protocol. Sometime the resultant image appears very “grey" and the image contrast become very low. Anyone have similar experience ? And why is that ? I have checked the exposure, the kv should be enough, and the mA is a little bit low, like 120kv 180ma for abdomen. Should i lower the kv to obtain more mA? But the machine is on automatic mA modulation

What confused me is that, this situation dont appears everytime, it just occur occasionally for thin patient

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