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Doctor insights on: What Does An Mri Of The Brain Show That A Ct Scan Doesn T

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If a brain MRI shows no acute process but only a nonspecific signal change in left parietal, is it advisable to do a CT scan considering its risk?

If a brain MRI shows no acute process but only a nonspecific signal change in left parietal, is it advisable to do a CT scan considering its risk?

Not necessary: It is not necessary to undergo a CT. Of course it would depend on why you had the MRI in the first place. Most of these findings that are called nonspecific are vascular spaces and not by themselves a cause to worry ...Read more

Dr. Heidi Fowler
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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Would a Brain MRI W/O Contrast & a CT Scan with and W/O Contrast show a brain tumor causing symptoms? Worried that it could have been missed.

Would a Brain MRI W/O Contrast & a CT Scan with and W/O Contrast show a brain tumor causing symptoms? Worried that it could have been missed.

MRI: A MRI with contrast is sufficient to detect evidence of a brain tumor. If there is any question as to whether a brain tumor is present or not, one can opt to repeat the MRI of the brain with contrast three months after the last MRI brain was obtained. ...Read more

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Would a Brain MRI without Contrast & a CT Scan with and without Contrast show a brain tumor causing symptoms? Worried that it could have been missed.

Would a Brain MRI without Contrast & a CT Scan with and without Contrast show a brain tumor causing symptoms? Worried that it could have been missed.

No symptomatic tumor: It is a pretty safe bet that MRI together with contrast CT can exclude a symptomatic tumor (mass) in the head. That does not mean all causes of headache or neurologic complaint are seen. Only your practitioner can give more advice to "put your mind at ease" and further direct your diagnostic journey. ...Read more

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What can a CT scan of the brain catch that a brain MRI scan cannot?

What can a CT scan of the brain catch that a brain MRI scan cannot?

Also, very fast!: Agree with excellent answer above. Additionally, ct scans have the advantage of being much faster than MRI scans, and they are much more widely available- if you come into a small hospital's er at 3 in the morning, they will likely be able to do a ct immediately, while an MRI might wait until the next morning (if it is available at all!). ...Read more

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CT scan showed spot on brain! MRI showed nothing why? Which one is right?

CT scan showed spot on brain! MRI showed nothing why? Which one is right?

Discuss with Doctors: We can not comment on the results of the MRI and CAT SCAN. We don't know why the tests were ordered and what does the spot mean and it's location and interpretation by the Radiologist. You have to discuss these findinngs as they apply to you based on your clinical status ...Read more

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I suffered of anxiety during a brain MRI evaluation, and it can not be completed. What others procedures (b.Map, CT scan) are useful for the brain?

I suffered of anxiety during a brain MRI evaluation, and it can not be completed. What others procedures (b.Map, CT scan) are useful for the brain?

Options: It is not uncommon for patients undergoing MRI scans to feel claustrophobic and have to end the test prematurely. If the information needed is important to make a diagnosis or determine treatment, you can try having the procedure with an open mri. Alternatively, if your doctor needs the clarity of the regular MRI images, you may benefit from mild anti-anxiety medications taken before the scan. ...Read more

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Which one is better at detecting blood clots (in the brain) MRI or CT scan?

Which one is better at detecting blood clots (in the brain) MRI or CT scan?

MRI: Blood clots can lead to strokes, which MRI is more sensitive at detecting.

To evaluate blood vessels for narrowing, one can use either MRI or ct. ...Read more

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Does a radiologist look for regional brain atrophy in a routine brain mri/ct scan?

Does a radiologist look for regional brain atrophy in a routine brain mri/ct scan?

Yes: The radiologist looks for any abnormal anatomical variation whether it be atrophy, malformation, infarction, hemorrhage, tumor or mass effect. Thanks. ...Read more

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I got infraorbital neuralgia, Brain MRI=good, CT scan = chronic maxillary sinus issue on side of the neuralgia. Could there be a relation?

I got infraorbital neuralgia, Brain MRI=good, CT scan = chronic maxillary sinus issue on side of the neuralgia. Could there be a relation?

Yes: Yes. Strong chance of relationship. See ENT doc with special expertise in sinus problems for management of chronic sinusitis. Resolve chronic sinusitis and see what happens to infraorbital pain.
"Burning" pain is difficult to treat. If no resolution, see orofacial-TMJ doc. ...Read more

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Ordered CT scan brain MRI for lumbar spine after fall stairs lft leg has been numb 3yr prior to stairs spine not bad brain chronic microvascular ishemic white matter disease ms? Autoimmune?

Ordered CT scan brain MRI for lumbar spine after fall stairs lft leg has been numb 3yr prior to stairs spine not bad brain chronic microvascular ishemic white matter disease ms? Autoimmune?

Ischemic Brain: Not likely. At your age, the vascualr ischemia is more apt to be due to chronic high blood pressure or diabetes. It is important to follow up on this with your doctor to avoid small lesions called "lacunar" infarcts. Often, medication can be prescribed which will improve your micro vascualr integrity and avoid further damage. ...Read more

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Leg/trunk lethargy for 4 weeks & hypoglycemic spells. Clean : echo, lung CT scan, brain MRI. ER visit findings : potassium 3.2, d-dimer 270, A1c 4.6?

Leg/trunk lethargy for 4 weeks & hypoglycemic spells. Clean : echo, lung CT scan, brain MRI. ER visit findings : potassium 3.2, d-dimer 270, A1c 4.6?

Hypokalemia: I specialize in low blood K. If BP is high or taking BP diuretics need to be checked for Conn's syndrome an adrenal gland problem that makes too much aldosterone. On BCP? Mention this to Dr. And if no good explanation for low K you need to be tested for this. ...Read more

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Safe for someone who has shunt for normal pressure hydrocephalus to get brain MRI for suspected pituitary adenoma? If no, is cat scan used instead?

Safe for someone who has shunt for normal pressure hydrocephalus to get brain MRI for suspected pituitary adenoma? If no, is cat scan used instead?

Check with neurosurg: Check with the neurosurgeon as to the type of shunt in place. With normal pressure hydrocephalus, it is very common that the shunt is a programmable shunt that allows the neurosurgeon to change the amount of drainage with a special magnet. There are some that are MRI resistant and some that aren't (these need reprogramming soon after mri). If it is non-programmable, you don't need to adjust it. ...Read more

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Can an excess of CSF show up on a CT scan or MRI of the brain?

Can an excess of CSF show up on a CT scan or MRI of the brain?

If hydrocephalus: Imaging can demonstrate increased size of brain ventricles, which is indicative of increase in csf, as contrasted to brain tissue, due to pressure. ...Read more

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If I had a MRI oct2012 & cat scan in dec 2012 & both where normal should I b worried bout a brain tumor? Can a CT scan show a brain tumor n the brain

If I had a MRI oct2012 & cat scan in dec 2012 & both where normal should I b worried bout a brain tumor? Can a CT scan show a brain tumor n the brain

No worry: Very unlikely you would have a brain tumor, and not have it show up on the tests you mention. Very unlikely it would develop since then. ...Read more

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I am getting a MRI of brain with and without dye. What can the dye show that no dye will not show? I'm afraid of the dye. Last CT scan dye caused tremors.

I am getting a MRI of brain with and without dye. What can the dye show that no dye will not show? I'm afraid of the dye. Last CT scan dye caused tremors.

MRI/Contrast: Mri of the brain demonstrates very detailed pictures of the brain. Under certain conditions, such as tumors or recent stroke or infection, contrast will show breakdown of the blood/brain barrier. The contrast used in MRI is completely different from ct contrast. ...Read more

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Can MRI or CT scan show brain damage from stimulants?

Can MRI or CT scan show brain damage from stimulants?

Stimulants: Stimulants such as Cocaine and amphetamine exert their effects on the user's nervous system and change the user's emotions, behavior, and affects cognition. They may cause miicrovascular ischemic disease of the brain which is unlikely to be detected by MRI or ct scan. ...Read more

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I am super paranoid that im not gettin enough oxygen to my brain, does a MRI CT scan show that? Dizzy/off balance for months, both came back normal

I am super paranoid that im not gettin enough oxygen to my brain, does a MRI CT scan show that? Dizzy/off balance for months, both came back normal

Just paranoid: Unless you are severely anemic, in severe heart failure or have severe occlusion of the blood vessels in the neck your brain is getting all the oxygen it needs. You can get more oxygen to your brain by exercising.
For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex. ...Read more

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Ct scan (can't have an MRI) shows white matter abnormality in right temporal occipital region. I have CVID and masssive migraines lately in right occi?

Ct scan (can't have an MRI) shows white matter abnormality in right temporal occipital region. I have CVID and masssive migraines lately in right occi?

White matter CT: You most likely have microvascular damage to small vessels in brain due to long standing hypertension. I specialize in this issue. ...Read more

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If I had verry slight damage to cerebellum, its possiblle that after some time the symtoms will gone? Like a little inmbalance or dizzy, ct scan show that I had damage but MRI doesn't showing that I have, but still I have symptoms like about few months and th

If I had verry slight damage to cerebellum, its possiblle that after some time the symtoms will gone? Like a little inmbalance or dizzy, ct scan show that I had damage but MRI doesn't showing that I have, but still I have symptoms like about few months and th

Head injury: You state damage to your Cerebellum so I am assuming you had a head injury. Although most people will have symptoms which resolve in a few weeks after a head injury, some people will take longer. This can be up to a year. This is known as a post concussion syndrome. ...Read more

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Tried again to do a brain MRI mild sedation still could not do it, clusraphobia no stand up MRI in aus, please what alliterative scan is there had a ct.

Depends: Depends on why the test is being done. But if you need a MRI and mild sedation doesn't work, many radiology centers do conscious sedation.

An alternative test is ct head with contrast but is often not as sensitive as a MRI but again it really depends on why the test is being ordered. Please speak with your ordering physician. ...Read more

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Liver CT shows growth of hemangioma 4.6cm & 3 new lesions. Onc didn't agree with it so ordered mri. Brain MRI added d/t nausea. Could this be mets?

Possible: Although benign etiology like hemangioma is possible, however, due to your history of breast cancer 2-3 years ago- I think an MRI of the liver should be done to really rule out possibility of metastatic disease- especially with reported- " new lesions" on ct scan. Or other options is to get a pet scan. Having said that, I really do hope that it turns out to be nothing serious. ...Read more

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Which has less side effects on body especially brain, CT scan or mri?

Which has less side effects on body especially brain, CT scan or mri?

Both very safe: However, MRI is likely safer because it does not use ionizing radiation like ct.

Mri is essentially a very fancy radio, and ct is a very fancy x-ray machine, taking images from multiple directions to make a picture.

Contrast agents, usually injected into a vein as part of both MRI and ct, have risks as well, however they are very low, well known and easily avoided or managed. ...Read more

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Can you tell me if I am likely to need dye for an MRI and CT scan of my brain?

Can you tell me if I am likely to need dye for an MRI and CT scan of my brain?

It helps: Contrast (dye) often adds additional information that is useful. In the setting of acute trauma to the head contrast is often not given. When looking for clues to other neurological problems the contrast can be very beneficial. ...Read more

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Will a MRI or CT scan of the brain so symptoms of a stroke days after a stroke? Think I may have had one I'm not sure.

Will a MRI or CT scan of the brain so symptoms of a stroke days after a stroke? Think I may have had one I'm not sure.

Yes: Both scans can show signs of strokes as they evolve over time however the key for you is to be evaluated by your personal or an ER physician. Additionally, small strokes that have symptoms completely resolve called TIA's may not show on imagining but are still very important to be evaluated. ...Read more

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I had a CT scan of my brain and they found a lesion, my dr. Said it could be meningioma. Going 4 mri. What else could it be?

Falx calcification: This is likely to be a benign tumor. But MRI will see the tumor more clearly. It will also see the dura and the meninges if they are involved. In general ct scans always lead to another test and therefore are less useful. If you have a choice always choose the mri. You will save yourself radiation and money. ...Read more

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Could a mri/ct scan detect all brain injurys?

Nope: Sometimes you can see evedence of bleeding. With traumatic brain injury sufficient to cause changes on ct typically survival is markedly reduced. Certain types of MRI done at the right time following a brain injury can sometimes show evidence of cerebral contusion. Much of the damage done with traumatic brain injury is microscopic (too small even with diffuse axonal injury) to be seen on mri. ...Read more

Dr. Julie Abbott
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. Michael Gabor
1,885 Doctors shared insights

Ct Scan (Definition)

Computed tomography (ct scan) or computed axial tomography (cat scan), is a medical imaging procedure that utilizes computer-processed x-rays to produce tomographic images or 'slices' of specific ...Read more