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Doctor insights on: Cat Scan V Mri

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How is a cat scan and an MRI different?

How is a cat scan and an MRI different?

Contrast difference: Ct uses a combination of xrays shot from multiple directions to look at differences in tissue density. Mri uses strong magnetic fields instead of xrays to differentiate tissues and gives much better contrast than ct. Ct is typically used in the acute setting to see if there is blood or major abnormalities. Mri is a more specific exam to differentiate abnormalities such as stroke or tumor. ...Read more

Dr. Milton Alvis, jr
5 doctors shared insights

Mri (Definition)

Magnetic resonance imaging named for the effects of the strong magnetic field upon the atomic and molecular phase or spin and the image created when that magnetic field is altered and the excited particle changes gibing off a signal that is recorded and interpreted by a complex computer algorithm, ...Read more


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What is the difference between MRI and a cat scan?

What is the difference between MRI and a cat scan?

MRI vs. CT: A ct (or cat) scan uses xrays and special computers to image the body. An MRI uses a combination of strong and weak magnets, radiofrequency coils and special computers to create images. There are certain body parts and disease processes that are better visualized with ct vs. Mri. Your doctor and/or the radiologist decide which test to perform based on many factors. ...Read more

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What's the difference , between a cat scan and an MRI ?

Different technology: Cat scan uses xrays and computerized technology to produce cross sectional images of an area inside the body also called ct scan mri imaging is a test that uses use a magnetic field and pulses of radiowave energy to make pictures of organs and structures inside the body.Mri may show problems that can not be seen with xrays, cat scan, ultrasound imaging both provide digital imaging that can be saved. ...Read more

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What is the main difference between CAT scan and MRI?

What is the main difference between CAT scan and MRI?

MRI/CT: A CT scan uses x-ray radiation to generate an image. An MRI uses magnetic fields "tuned" to the frequency of protons in the body. Since each scan essentially measures a different property of tissues in the body, they are complementary tests. That is why if one doesn't provide a definitive answer, often the other will be ordered. ...Read more

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What are the differences between an MRI and a cat scan?

What are the differences between an MRI and a cat scan?

MRI/CT: A CT scan uses x-ray radiation to generate an image. An MRI uses magnetic fields "tuned" to the frequency of protons in the body. Since each scan essentially measures a different property of tissues in the body, they are complementary tests. That is why if one doesn't provide a definitive answer, often the other will be ordered. ...Read more

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Need advice on what is the the difference of an MRI can a cat scan?

Need advice on what is the the difference of an MRI can a cat scan?

Big difference: Ct scans use radiation to make the images. Mri uses no radiation but instead uses magnetic fields to create images. Both use computers to reconstruct the information acquired so that it can be useful. ...Read more

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Can ascities be seen on cat scan or mri?

Can ascities be seen on cat scan or mri?

Yes: Ascities is fluid build up in the abdomen. It can be seen on these tests and also if big enough noted on physical exam. ...Read more

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What is the difference between an MRI and a cat scan? Except for the radiation factor.

What is the difference between an MRI and  a cat scan? Except for the radiation factor.

Physics: The physical phenomena on which these imaging techniques are built are very different, each is best suited for different purposes. Cat scans are sophisticated x ray, they rely on the degree of absorption of gamma rays (bones, ca, other metals will contrast most). Mri is better for softer tissue imaging because it depends more on the behavior of hydrogen atoms and h2o in the strong magnetic field. ...Read more

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What is the difference in diagnostics between mri, cat scan and colonoscopy? Which one is best for identifying problems?

What is the difference in diagnostics between mri, cat scan and colonoscopy?  Which one is best for identifying problems?

Big differences: Each of the tests you mentioned (mri, ct, colonoscopy) are used to diagnose different things. Therefore, depending on the problem you are trying to figure out, one test will be better than another. For example, colonoscopy is great for picking up colon polyps, but a regular ct would probably miss them. However, a ct would be great for appendicitis, and a colonoscopy would not be. ...Read more

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I have to go for a eus test tommorow i was just courois if the eus test would pick up something that cat scan or MRI would miss?

I have to go for a eus test tommorow i was just courois if the eus test would pick up something that cat scan or MRI would miss?

Yes: The endoscopic ultrasound is capable of visualizing small lesions which might not be apparent on ct or mri. This is because the probe is brought right next to the area of interest and higher frequency probes can be used which provide higher resolution than can be obtained with trans-abdominal scanning. ...Read more

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Would a MRI or cat scan show if i'm having a nerve problem going on in the inside of my head or would it show if there was something dangous?

Let me explain: Both test are diagnostic test, did you any physical findding? This what count. The MRI will show if you problem as so the cat scan. Good luck. ...Read more

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Would dementia show up on MRI or cat scan?

Would dementia show up on MRI or cat scan?

Not necessarily: Mri and cat scans show anatomical brain changes only, not functional ones. If a dementia is far enough advanced to change brain structures, it would "show up" on these scans. However, there may be a long decline in brain function before that point is reached. There are functional scans which might detect changes before anatomic anomalies can be seen. A normal MRI does not "rule out" dementia. ...Read more

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Which one has the most radiation mri, X-ray or a cat scan?

CT radiation: Ct has the most. It is the equivalent of multiple x-rays. Mri has no radiation. ...Read more

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Are mris or cat scans better for migraines? I have been having migraines for some time now and want to get it looked into, but i was wondering whether an MRI or a cat scan is better for that. Or is there an even better test to diagnose what is causing he

Are mris or cat scans better for migraines? I have been having migraines for some time now and want to get it looked into, but i was wondering whether an MRI or a cat scan is better for that.  Or is there an even better test to diagnose what is causing he

Use can vary: Most pts who suffer migraine and have normal neurological exams do not need MRI or cat, but of the two, the MRI is far better regarding brain details and resolution, and may show a small vascular malformation that the cat could miss. Sometimes, headaches are due to problems with venous sinuses and MRI also better. If looking for aneurysm, mra or ct angio approaches are best. ...Read more

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Is an MRI of the stomach as good as a cat scan of the stomach?

No: Actually neither MRI or ct of the stomach are particularly sensitive, but it depends on what the problem is. If you are having digestive problems, you need a upper GI series. If you are having severe pain or bleeding you may need an endoscopy. Consult with your physician to determine the proper course of action. ...Read more

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If I feel a discomfort around my shoulder blade and chest area, does it make to sense to get a CAT scan or MRI for inspection?

If I feel a discomfort around my shoulder blade and chest area, does it make to sense to get a CAT scan or MRI for inspection?

Evaluation: Please see your PCP, and among possible causes are heartburn, an irregular heart beat or chest wall strain.
Avoid spicy and acidic foods, and apply local heat to assess whether this improves the pain. ...Read more

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Having an MRI done in oct.2012 & a cat scan done n dec2012 for pains n headaches n my head can anything serous change both test where normal...?

No: Headache in young people are usually benign esp. After having 2 normal head imaging studies. They are usually from migraine, tension or cluster headache. (google online for more info) other possible causes of headaches- stress, sleep deprivation, too much caffeinated drinks, hypertension, use of recreational drugs, concussion, etc. Headache usually is recurrent. Go see your dr. For reasssurance. ...Read more

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Do you think I should get an MRI or cat scan imaging to see what is causing my migraine headaches?

Not necessarily: Approximately, 98% of brain imaging in migraine shows no structural risk factors causing the headaches, and in most cases, it is a waste of money and resources. If you have some clinical finding on a neurological exam suggesting intracranial problems, then the films are appropriate. Would see a neurologist and get this managed. Should turn out very well. ...Read more

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What happens if you have an MRI scan for headaches and it reveals nothing, could a cat scan reveal something?

It is possible,: but unless an acute intracranial bleed is a clinical consideration, very unlikely that a Head CT scan would add much value. CT of the sinuses may be helpful if sinusitis is a possibility. ...Read more

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Whats the difference between an MRI and a cat scan? More specifically-why would an ENT order one or the other?

Whats the difference between an MRI and a cat scan? More specifically-why would an ENT order one or the other?

Imaging tests: Depends on your condition/symptoms. Ct uses radiation, like multiple x-rays. Mri uses magnets, and is very useful in characterizing soft tissue differences such as in the brain or joints. Ct is better for looking at the bones in and around ear (temporal bones). Mri better for inner ear, nerve roots, etc. Ct also best for sinuses, and is typically used with contrast to evaluate the neck. ...Read more

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Before I adopt a child is there a way to test a 1 or 2 year old for ADHD like with a cat scan, MRI or any other way?

Before I adopt a child is there a way to test a 1 or 2 year old for ADHD like with a cat scan, MRI or any other way?

No: Adhd is a clinical diagnosis, based on symptoms of inattention, behaviors and performance. There aren't any imaging tests that can diagnose it and currently there are no criteria for diagnosing it in 2 year olds. ...Read more

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If i ordered a cat scan of my brain but now wanna mri, how can I change it? Could i call the nurse and change it or have to go to another appointment?

If i ordered a cat scan of my brain but now wanna mri, how can I change it? Could i call the nurse and change it or have to go to another appointment?

Depends: The most important question is why are you having the ct of the head. If it is being done because of concerns about intracranial bleeding then that is the most appropriate test. If it is being done as a screen then you are unlikely to get your provider to change it due to cost and medical necessity. Good luck and well wishes. ...Read more

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I had this off & on for months, I get this numbness on my right side temple and right side face. I had a cat scan & nothing wrong, should I get a mri?

I had this off & on for months, I get this numbness on my right side temple and right side face. I had a cat scan & nothing wrong, should I get a mri?

Might help.: MRI's can find things a CT scan can't. So it would not be a bad idea. If you have not yet seen a neurologist, do so. Be sure you have copies of your medical records and any imaging and lab studies you have had done. The more information any specialist has about your previous history and workups the better job he/she will be able to do. ...Read more

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What are the chances of false negative mris and cat scans? What are the odds that an MRI and a cat scan would both show no cancer when there really is cancer present? What about the opposite, where they would both should cancer when there really is none?

No test is 100%: The sensitivity of MRI and ct scans depends partly on the type of cancer and the location in the body. In general, they can find tumors that are a few millimeters in size which can be 10's of millions of cancer cells. If all scans are negative a patient may be considered in remission, but with cancer it is really only the "test of time" that ensures no microscopic cells are left. ...Read more

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Which test- cat scan or mri- is best at looking at sinuses? Had severe sinus inflammation show up on both, but which test has the most detail?

Which test- cat scan or mri- is best at looking at sinuses? Had severe sinus inflammation show up on both, but which test has the most detail?

In most: cases, CT is preferred, due to its superior delineation of bone detail versus MRI. Variations in the bony structure of the sinuses are often responsible for predisposing to sinusitis. ...Read more

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I'm feeling alil dizzy & alil bit pains n my head i'm alil worried if this may b something serous? I've had a cat scan 2 months ago & a MRI n oct/2012

I'm feeling alil dizzy & alil bit pains n my head i'm alil worried if this may b something serous? I've had a cat scan 2 months ago & a MRI n oct/2012

Tumor unlikely : Assuming the MRI was accurately read as normal, it is pretty unlikely that you will have a significant structural problem like a tumor. I assume that this is your main concern. ...Read more

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I have a fusion at l4-l5 with instramentation. An MRI in 2010 confirmed i had a bulging disc at s1 where I have pain. A new MRI & cat scan was ordere?

I have a fusion at l4-l5 with instramentation. An MRI in 2010 confirmed i had a bulging disc at s1 where I have pain.  A new MRI & cat scan was ordere?

Consult your Spine: Surgeon. It is a common to have increased stress at the spinal segment above and below a fusion, with resultant acceleration of degeneration of these segments. However because you see these on xray/mri doesn't mean it is causing any symptoms. A well-trained spine specialist in your area will help you identify the pain generator, which might have nothing to do with the bulging disc you described. ...Read more

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How early can a brain tumor be detected on a CAT scan or MRI?

How early can a brain tumor be detected on a CAT scan or MRI?

Do you have one?: You know, it’s remarkable how many young people post questions here about CT and MRI scans and brain tumors with never an explanation of why they’re interested. I wonder why they’re all so curious. They must be worried about SOMETHING. It depends on the type, size and location of the tumor, and whether the scan is properly configured to screen for tumors. ...Read more

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Cat scan showed 2 mm mass beside aorta.Gen. Doc wants pet/mri/other tests & other specialist appts set up. What ?S should I be asking?

Cat scan showed 2 mm mass beside aorta.Gen. Doc wants pet/mri/other tests & other specialist appts set up. What ?S should I be asking?

2 mm, really?: If the mass is really 2 mm, it is too small for pet. If it is 2 cm, then pet may be helpful. ?S to ask - what organ is it originating from - if the aorta, consider a consult with a cardiologist. ? - was it seen on any older scans - if, in retrospect, it was there 2 years ago and unchanged, then it is probably benign. Why was ct done in the first place? ...Read more

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I have has a Mri.And the needle test Cat scan.And all they come up with in a bulged hernia.Im on so much meds. And my leg KILL me 24-7..No meds help?

I have has a Mri.And the needle test Cat scan.And all they come up with in a bulged hernia.Im on so much meds. And my leg KILL me 24-7..No meds help?

Consult a: Neurologist and Neurosurgeon. Based on the limited information available here, you need to have a specialist guide you through the options for treatment of your pain up and including the point at which you may need surgery. Depending on the severity of the structural abnormality, you may benefit from rest, NSAIDS, physical therapy, or chiropractic care. Steroid injections can be helpful in the proper situation. Check out this very informative site for detailed discussion. http://orthoinfo.aaos.org/topic.cfm?topic=a00534 ...Read more

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Im 18 and have a lot of weird symptons/major anxiety, and i was wondering if a cat scan/mri done 3/4 years ago and a neuro test can rule out parkinson?

Im 18 and have a lot of weird symptons/major anxiety, and i was wondering if a cat scan/mri done 3/4 years ago and a neuro test can rule out parkinson?

Seek help: Things change over the space of three to four years. You are a bit young for parkinson's.Ibelieve you can profit from a visit to a psychiatrist. ...Read more

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I Have concerns about a cat scan that showed a spot on my liver in march 2017 and then it was bigger in sept 2017 1.6-2.6cm i was supposed to get mri of it but i did not due to fear of MRI now im worried ive missed something big ..

I Have concerns about a cat scan that showed a spot on my liver in march 2017 and then it was bigger in sept 2017 1.6-2.6cm 
i was supposed to get mri of it but i did not due to fear of MRI now im worried ive missed something big ..

See doctor: There is nothing to be afraid of an MRI. MRI is not the only imaging method that could be used. Ultrasound examination may help. Even repeat CT may be useful. Do see your doctor for a consultation.
Wish you 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, if you have sex. ...Read more

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How to alleviate "Thigh" and "Leg" pain that feels nerve related. I've had MRI, CAT Scan and saw a neurologist, all to no avail.

How to alleviate "Thigh" and "Leg" pain that feels nerve related.  I've had MRI, CAT Scan and saw a neurologist, all to no avail.

There are many choic: Depending on your doctor's recommendations, you could be treated with one or more of the several available Pain medications. Tylenol(Paracetamol) is the easiest and safest medication. Other medicines include Gabapentin or Amitriptyline. try them one at a time and see what works best for you. ...Read more

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Before I adopt a child, is there a way to test a 2 year old for ADHD or other brain problems with a cat scan, mri, or any other way?

Before I adopt a child, is there a way to test a 2 year old for ADHD or other brain problems with a cat scan, mri, or any other way?

Probably not: Age 2 is far too young to be able to test for many of the disorders of concern to you, and scans are not going to help. Infant psychologists can estimate overall intelligence and functioning at this age, but that may be affected by the child's circumstances before adoption. They can pick up current problems but are not apt to be great at predicting future ones such as adhd. ...Read more

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Had a cat scan and MRI just stuff from old stroke but headaches are still coming what could be the problem. Doctor says headaches might be migrains ?

Had a cat scan and MRI just stuff from old stroke but headaches are still coming what could be the problem. Doctor says headaches might be migrains ?

Possibly: According to international headache society, there are only two types of headaches, vascular (migraine) and tension. With your history are most likely vascular in nature. ...Read more

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Blood tests ultrasounds and a cat scan a 2 yrsago doctor won't give me a MRI for my daily minor headaches what do I do? Is dr right no need to worry?

Enough tests: The cat scan and your evaluation should be enough. An MRI is unlikely to add any value. If you continue to have headaches, ask for a referral to a neurologist who may be able to help you bring the headaches under control. Another consideration is to consider the amount of stress you are under. A thorough assessment of head and neck structures may also undercover the cause of your headaches. ...Read more

Dr. Michael Gabor
1,923 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