“Is radiology equipment really safe?”

This is an interesting question. In fact, it used to be that medical radiation for some reason or other was not considered radiation exposure at all for the patient. The physicians/radiologists however who work with this daily wear radiation badges. So to be quite honest, there is always some risk with radiation. Your physician is always weighing the benefit versus risk ratio with regard to exposing you to any type of particular study. This is something that you would probably need to discuss with your physician if you are unduly worried. The younger you are, the more you would have to have some concern regarding the amount of radiation you receive particularly when dealing with larger doses which might be involved with CT scan of the chest and abdomen. I am unsure as to what you mean regarding “pre-existing condition.”

That is way too broad of a question to answer, be more specific

In radiology, as in all of medicine, it is a risk versus reward relationship, with the most important consideration being first do no harm.
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Radiology equipment is safe. Only problem would be if you need contrast and have an allergy. Abnormal kidney function can also be an issue if you need contrast.

Radiology equipment has absolutely nothing to do with what ails a person. I may not fully understand the question, however, so please feel free to rephrase if I have not answered you completely.

Non ionizing modalities such as US, and MRI are safe. MRI cannot be used with MRI incompatible pacemakers. The principle of ALARA has to be considered with CT and Plain film X-rays. Although there are no immediate effects. Long term effects of continued chronic medical X rays are unknown and data is exprepolated from the Hiroshima victims. A plain film Xray of three cheat is equal to an East to West coast US flight in terms of dose. A CT of the chest is 100 plain film X-ray doses depending on the equipment used. Newer equipment has dose monitoring software. Children are much more radiosensitive then adults and therefore X rays have to be used judiciously in children and pregnant women.

Radiology equipment is very safe and independent of patient condition, other than obesity. Larger patients require greater exposure to be able to penetrate the body. All equipment is inspected regularly and there have been advances in the technology that have resulted in reduced radiation exposure to patients, particularly in CT scanning.