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  • PET MRI CT scan which is best?

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    Old 07-10-2005, 07:31 AM   #1
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    PET MRI CT scan which is best?

    I can't seem to figure out which scan provides the best whole body information.

    When I asked my Doctor for a PET scan, he said - we don't have one.
    However, I have found a diagnostic centre 30 minutes or so from where I live, who does have a PET unit. (Patient pays - but heck I'd pay to know what is really going on inside. Sometimes I feel that Johnny Carson's Swami can see more in the envelope that my doctors do at the moment.

    Before they fry, poison and cut me, I'd like to know if the PET scan will give them accurate information re anal polyp and suspicious lump (lymph node?)

    Any idea where I can find the three compared as to their relatlive diagnostic and clinical value?

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    Old 07-10-2005, 09:39 AM   #2
    Nassau one
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    Re: PET MRI CT scan which is best?

    Hi Mudlark,

    My understanding is that a CT scan can show up any lesions, tumours, cysts etc but the PET scan lights up if any suspicious lesion is malignant. When my husband's post treatment CT scan showed something on the liver, we were sent to the US for a PET scan which showed that there was no malignancy. I notice in the consultant's report he ordered the PET scan instead of an MRI. Now, I am not sure where the MRi fits in to all of this but I am sure Cancerdad or Ktee will be able to enlighten us!

    You are wise to check into all of this so you know what is the best treatment for you.

    Take care,

    Old 07-10-2005, 08:37 PM   #3
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    Re: PET MRI CT scan which is best?

    If you have question of mets, a PET is definitely the way to go. A CT will only be useful in showing specific abnormalities... they actually now have a PET/CT, so as the radiologist runs the PET, they can hone in directly on the CT area to avoid false positives.

    Hope that helps,

    Old 07-10-2005, 11:32 PM   #4
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    Re: PET MRI CT scan which is best?

    Hello all

    No one test can give all the necessary information. For example, sometimes even modern scans cannot pick up tiny areas of cancer. Occasionally, other medical conditions show similar results, making it difficult to decide what is and is not cancer.

    CT (computerised tomography) scan takes a series of x-rays which builds up a three-dimensional picture of the inside of the body. It can show the size of the tumour in the bowel and whether it has spread beyond the bowel. CT scans use a small amount of radiation, which will be very unlikely to harm you and will not harm anyone you come into contact with.

    MRI (magnetic resonance imaging) scan is similar to a CT scan, but uses magnetism instead of x-rays to build up cross-sectional pictures of your body. The mri chamber is a very powerful magnet, so before going into the MRI room you have to remove metal belongings. People who have heart monitors, pacemakers or certain types of surgical clips cannot have an MRI because of the magnetic fields.

    PET (positron emission tomography) scans are a new type of scan and how effective they are in the diagnosis of bowel cancers compared to other types is not yet fully known. These scans are not available in all hospitals and you may have to travel to a specialist centre to have one. A PET scan uses low-dose radioactive sugar to measure the activity of cells in different parts of the body. A very small amount of a mildly radioactive substance is injected into a vein, usually in your arm. A scan is then taken. Areas of cancer are normally more active than surrounding tissue and show up on the scan.

    I would go along with cancerdad and try for a combined test.

    hpe the ab ove helps

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