Question 1

is it safe to do mri with contrast to see avm / aneurysm if i had at ct with contrast anaphylaxis shock ? or how can do it otherwise ? thank a lot.

Accepted Answer

Different: X-ray (CT) contrast is iodine based and allergic reactions are fairly common. MRI uses Gadolinium which is completely different and allergic reactions are rare. Here is a reference: http://www.medicalnewstoday.com/releases/92774.php
I'm not aware of any cross-reactivity but the radiologist supervising your study will know for sure. Mention your previous reaction to them.

Question 2

i have hypothyroidism.  is it safe to have a ct scan w/ contrast?  if an mri  alternative? i also have a harrington rod in my back. any alternative.

Accepted Answer

Thyroid and CT: If your hypothyroidism is appropriately treated there is nothing to worry about.   If you do not have renal impairment, then the use of contrast should be safe.  Every test, including a CT, is a balance of risks and benefits.  If you need the CT, then go with your doctor's advice.

Question 3

is it safe to get an mri contrast a few hours after ct contrast? how safe is the contrast? i heard it had lawsuits behind it. the reason for testing is a seizure since they could not find anything on the ct scan?

Accepted Answer

: Would delay the second contrast injection for at least 24 hrs, as there is a remote risk of kidney problems and too much contrast over a brief time would provide additive risk.  Make sure you are well hydrated prior to the MRI.

Question 4

is it safe to say that a non contrast mri and a contrast ct scan ( both completed in the past 7 months ) would show a mass/tumor in the brain ?

Accepted Answer

: Both tests would reliably demonstrate the presence of a brain tumor large enough to cause symptoms.  The MRI has better soft tissue clarity and resolution.  Since it is not clear why these studies were done, nor what problems prompted this, cannot provide guidelines to further evaluation, if needed.

Question 5

which is safe and mri or ct scan?

Accepted Answer

Both are safe.....: Mri has no ionizing radiation, thus there is no risk of radiation induced cancer. However, MRI is not for everyone. If you are claustrophobic, have a heart pacer, or have shrapnel you may not be able to have an mri. Ct does have radiation, but the dose is very small and in most cases less than you are exposed to just by living on earth for one year. You, your doc and radiologist should decide.

Question 6

can mri without contrast diagnose stroke or is ct better?

Accepted Answer

Usually a ct is done: Acutely, or in the first 24 hours to rule out a bleed and see larger strokes. After the acute diagnostic phase, an MRI may be done to see smaller strokes or level and/or progression of damage if it was an ischemic stroke.

Question 7

what is the difference between mri contrast and ct scan contrast ?

Accepted Answer

Not same: Mri contast gadolinium does not contain iodine while ct contrast contains iodine.  An allergic reaction to ct contrast does not mean that you will have a reaction to gadolinium during your MRI scan. True allergies to the MRI contrast are exrtremely rare; however, you may still experience some symptoms like feeling lightheaded or nauseated due to the injection. Good luck with the exam!

Question 8

can a ct and mri without contrast  detect a pituitary tumour?

Accepted Answer

Yes it could: Ct is more dependent on contrast. But MRI has two phases(t1and t2) which can serve like a contrast and the tumors often show up better in t2 weighted images.

Question 9

what would a ct angio with contrast detect that a mri/mr angio without contrast not detect?

Accepted Answer

Not much: Both studies are very accurate.CT contrast helps visualize the walls of the vessels and smaller vessels. MRI usually doesn’t need the contrast agent

Question 10

what would a ct head scan show versus having a mri head scan? and with or without contrast?

Accepted Answer

Need to talk with : Your ordering doctor. Depends on what is being evaluated, and the differential diagnosis. Ct is a good quick screen for bleed, masses, skull fractures, etc. And MRI gets you good soft tissue details, and lets you better evaluate the gray and white matter, also allows you to evaluate bleeds, helps you tell if old or new bleed, also helps you see tumors, strokes (ischemic areas, atrophy, etc.).

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Doctor answers about:

Is ct or mri contrast safe with porphyria

A member asked:

Is it safe to do mri with contrast to see avm / aneurysm if i had at ct with contrast anaphylaxis shock ? or how can do it otherwise ? thank a lot.

A member asked:

I have hypothyroidism. is it safe to have a ct scan w/ contrast? if an mri alternative? i also have a harrington rod in my back. any alternative.

A member asked:

Is it safe to get an mri contrast a few hours after ct contrast? how safe is the contrast? i heard it had lawsuits behind it. the reason for testing is a seizure since they could not find anything on the ct scan?

A member asked:

Is it safe to say that a non contrast mri and a contrast ct scan ( both completed in the past 7 months ) would show a mass/tumor in the brain ?

A member asked:

Which is safe and mri or ct scan?

A member asked:

Can mri without contrast diagnose stroke or is ct better?

A member asked:

What is the difference between mri contrast and ct scan contrast ?

A member asked:

Can a ct and mri without contrast detect a pituitary tumour?

A member asked:

What would a ct angio with contrast detect that a mri/mr angio without contrast not detect?

A member asked:

What would a ct head scan show versus having a mri head scan? and with or without contrast?

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