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Doctor insights on: Is Ct Or Mri Contrast Safe With Porphyria

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Dr. Jeffrey Stevens
1 doctor shared a insight

Computed Tomography (Definition)

Ct uses xrays taken an 360 degrees combined with a computer to see"inside" the body. The table moves as the xray tube and detectors spin around the patient 10 times a second or more! the image shows excellent soft tissue detail, enhanced with injection of intravenous contrast or oral contrast. This way the body is shown in slices, in any plane, usually axially, but ...Read more


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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.

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.

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. ...Read more

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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.

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. ...Read more

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Which is safe and MRI or CT scan?

Which is safe and MRI or CT scan?

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. ...Read more

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Can MRI without contrast diagnose stroke or is CT better?

Can MRI without contrast diagnose stroke or is CT better?

MRI: Both studies are commonly used in the early evaluation of stroke. A ct can rule out a hemorrhagic stroke quickly in the er. A MRI is more sensitive for a ischemic stroke but takes longer to perform. ...Read more

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What is the difference between MRI contrast and CT scan contrast ?

What is the difference between MRI contrast and CT scan contrast ?

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! ...Read more

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Had MRI w/ no contrast yesterday and it showed 8mm hyporintense lesion in inferior aspect of spleen. Ct w/ contrast three days ago noted small granulomus are noted. Which is more reliable?Concerning?

Neither finding: Is cause for concern. Mri is better at finding small cysts and benign hemangiomas than ct. Granulomas are also benign and usually result from prior exposure to histoplasmosis (very common). ...Read more

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Can a CT and MRI without contrast detect a pituitary tumour?

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. ...Read more

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Would you need an MRI with contrast or CT scan to diagnose chiasmal syndrome?

Either: Either a ct with and without contrast or an mr exam seem treasonable approaches. I may slightly favor the mr exam. ...Read more

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What would a CT head scan show versus having a MRI head scan? And with or without contrast?

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.). ...Read more

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Dr. Sheila Smith
5 doctors shared insights

Mri (Definition)

Mri or magnetic resonance imaging is one of the more recently developed imaging modalities available to physicians. It uses powerful magnets to generate images. There is no ionizing radiation which is a major advantage over many other modalities. Mri is the best imaging exam that we have for most soft tissue and joint related problems. There are radiologists ...Read more


Dr. Aletha Tippett
89 doctors shared insights

Porphyria (Definition)

The porphyrias are metabolic disorders caused by abnormalities in the synthesis of heme, the portion of hemoglobin which carries the iron inside red blood cells. The manifestations of porphyria vary considerably depending on the mutation involved, ranging from light sensitivity to liver failure to nerve damage to bouts of terrible pain. Special testing is required to ...Read more