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home:tests:imaging [10.25.2016] – [Imaging tests including MRI, CT scan, and X-rays] sallieq | home:tests:imaging [09.14.2022] (current) – external edit 127.0.0.1 | ||
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====== Imaging tests including MRI, CT scan, and X-rays ====== | ====== Imaging tests including MRI, CT scan, and X-rays ====== | ||
- | Magnetic resonance imaging (MRI) is a test that produces very clear pictures, or images, of the human body without the use of x-rays. MRI uses a large magnet, radio waves and a computer to produce these images as [[http:// | + | Magnetic resonance imaging (MRI) is a test that produces very clear pictures, or images, of the human body without the use of x-rays. MRI uses a large magnet, radio waves and a computer to produce these images as [[https:// |
64-slice CT scanner. Beta blockers are usually given in conjunction with this type of scan, and an IV contrast material is used. Evidently the contrast dose is lower but the radiation exposure is higher, compared to the older 16-slice CT scans. | 64-slice CT scanner. Beta blockers are usually given in conjunction with this type of scan, and an IV contrast material is used. Evidently the contrast dose is lower but the radiation exposure is higher, compared to the older 16-slice CT scans. | ||
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Xrays are very subjective in interpretation. It is best to get the original radiographer' | Xrays are very subjective in interpretation. It is best to get the original radiographer' | ||
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Risk is not only from radiation exposure, but may arise from dyes used, depending on individual sensitivity, | Risk is not only from radiation exposure, but may arise from dyes used, depending on individual sensitivity, | ||
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===== Notes and comments ===== | ===== Notes and comments ===== | ||
TECH | TECH | ||
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If you are having an MRI with contrast they will be using an I.V. form of the element gadolinium, that is usually largely eliminated with no problem in most people. There may be a problem in those with kidney problems, and the FDA has issued a black box warning recently about this. It mostly involve MRA's, but could be relevant to MRI's. See: | If you are having an MRI with contrast they will be using an I.V. form of the element gadolinium, that is usually largely eliminated with no problem in most people. There may be a problem in those with kidney problems, and the FDA has issued a black box warning recently about this. It mostly involve MRA's, but could be relevant to MRI's. See: | ||
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The gadolinium would be fine for most people on the MP, but everyone should be aware of the black box warning. In those with kidney involvement I would always see if an MRI without contrast would be good enough to visualize what needs to be examined. | The gadolinium would be fine for most people on the MP, but everyone should be aware of the black box warning. In those with kidney involvement I would always see if an MRI without contrast would be good enough to visualize what needs to be examined. | ||
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This is a horrible source, but it might be worth following up on these studies: | This is a horrible source, but it might be worth following up on these studies: | ||
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The New England Journal of Medicine (Nov.29, 2007) reported the average American' | The New England Journal of Medicine (Nov.29, 2007) reported the average American' | ||
- | For a more readable synopsis and comment, see [[http:// | + | For a more readable synopsis and comment, see [[https:// |
Part of the research report says: | Part of the research report says: | ||
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===== References ===== | ===== References ===== | ||
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