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Sumer K Sethi, MD
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Oct 23, 2007 10:53PM
- 3 comments
Magnetic resonance imaging, or MRI, is a way of obtaining images of organs using a magnetic field without using harmful ionizing radiation. It uses a magnnetic field so there are some contraindications peculiar to magnetic field like metallic implants, cardiac pacemakers, cochlear implants etc. There is no risk of because of radiaition and is a non-invasive safe procedure.
It is especially useful for evaluation of Brain and spinal cord. It has advantages of being able to take images in all three planes that is multiplanar imaging.It is also an alternative to CT in patients who are allergic to iodine as contrast material used in MRI is Gadolinium, which is a paramagnetic substance. It has very high soft tissue contrast so has revolutionized soft tissue and musculoskeletal imaging.
It takes a longer time to do a MRI and it is a tunnel like structure so patients with claustrophobia (fear of closed places) may have trouble getting a MRI done
Magnetic resonance imaging, or MRI, is a way of obtaining images of organs using a magnetic field without using harmful ionizing radiation. It uses a magnnetic field so there are some contraindications peculiar to magnetic field like metallic implants, cardiac pacemakers, cochlear implants etc. There is no risk of because of radiaition and is a non-invasive safe procedure.
It is especially useful for evaluation of Brain and spinal cord. It has advantages of being able to take images in all three planes that is multiplanar imaging.It is also an alternative to CT in patients who are allergic to iodine as contrast material used in MRI is Gadolinium, which is a paramagnetic substance. It has very high soft tissue contrast so has revolutionized soft tissue and musculoskeletal imaging.
It takes a longer time to do a MRI and it is a tunnel like structure so patients with claustrophobia (fear of closed places) may have trouble getting a MRI done
Oct 23, 2007 10:49PM
- 5 comments
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Computed tomography (CT) or CAT scan, uses a rotating X ray tube and computer to obtain thin sections of the body. It is especially useful in cases of head injury and stroke. It is best investigation to detect acute hemorrhage and calcification anywhere in the body. It is also good to evaluate cortical bone.
Although it is non-invasive it uses ionizing radiation. although three dimensional reconstructions are possible it doesnt give direct multiplanar images.
It may require use of an iodianted contrast which may be toxic to kidneys in very high doses and can cause idiosynratic reactions in some (especially asthmatics, diabetics, cardiac patients etc). Metallic objects like coins, dentures etc may cause artefacts in the images.
Women should inform if there is any possibility that they are pregnant, as the examination involves radiation which is harmful to the fetus.
Tags:
Computed tomography (CT) or CAT scan, uses a rotating X ray tube and computer to obtain thin sections of the body. It is especially useful in cases of head injury and stroke. It is best investigation to detect acute hemorrhage and calcification anywhere in the body. It is also good to evaluate cortical bone.
Although it is non-invasive it uses ionizing radiation. although three dimensional reconstructions are possible it doesnt give direct multiplanar images.
It may require use of an iodianted contrast which may be toxic to kidneys in very high doses and can cause idiosynratic reactions in some (especially asthmatics, diabetics, cardiac patients etc). Metallic objects like coins, dentures etc may cause artefacts in the images.
Women should inform if there is any possibility that they are pregnant, as the examination involves radiation which is harmful to the fetus.
Oct 16, 2007 01:16AM
- 2 comments
Dear Readers,
I am Dr Sumer Sethi, MD a radiologist based in New Delhi and this blog is intended to serve primarily as a patient information portal. My other blog is www.sumerdoc.blogspot.com, known as Sumer's Radiology Site providing various radiology related information for Doctors and patients.
I am Dr Sumer Sethi, MD a radiologist based in New Delhi and this blog is intended to serve primarily as a patient information portal. My other blog is www.sumerdoc.blogspot.com, known as Sumer's Radiology Site providing various radiology related information for Doctors and patients.
