CT scan vs MRI for abdomen/pelvis

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Hi I've got a CT abdomen/pelvis with contrast booke, as I have been experiencing intermittant bouts of mushy faeces, cramps with mucous and constipation since March last year.Also had 2 episodes with some blood.The cramps are milder now than back then and I have put 2kg of the 3 kg I lost.Is it to have a MRI instead of a CT scan for my admonen/pelvis on the NHS?Reason being is that I'm really concerned about the radiation dose.I hear its moderately low risk but I'd rather take such a dose of radiation over a short time.Would the specialist still be able to check for the same things using MRI than CT.Also the NHS CT scan do they adjust the amount of radiation dose according to your body weight and belly fat?So in essense if Im smaller I'd recieve a lower dose?If so do you know what the different body size levels are that they step the radiation up and down for?Are there any further measures that can be taken to reduce my exposure, I've heard of a lead apron and testicle cover.

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    Also are there any measures I can take to reduce the negative effects of the ionising radiation?I've heard antioxidents can help reduce the damage that is caused?Does some of the radiation exit my body afterwrds via my urine and faeces?


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