ovdje kaze-ako je u pitanju skeniranje sa vecim kontrastom(npr.kosti-okolo meko tkivo) CT,ako je samo meko tkivo MRI.CT je i zracenje,MRI to nije.CT je jeftiniji i brzi,MRI skuplji.
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MRI versus CT
A computed tomography (CT
) scanner uses X-rays, a type of ionizing radiation, to acquire its images, making it a good tool for examining tissue composed of elements of a higher atomic number than the tissue surrounding them, such as bone
and calcifications (calcium based)
within the body (carbon based flesh), or of structures (vessels, bowel)
, on the other hand, uses non-ionizing radio frequency (RF) signals to acquire its images and is best suited for non-calcified tissue
, though MR images can also be acquired from bones and teeth as well as fossils.
CT may be enhanced by use of contrast agents containing elements of a higher atomic number than the surrounding flesh such as iodine or barium. Contrast agents for MRI are those which have paramagnetic properties, e.g. gadolinium and manganese.
Both CT and MRI scanners can generate multiple two-dimensional cross-sections (slices) of tissue and three-dimensional reconstructions. Unlike CT, which uses only X-ray attenuation to generate image contrast, MRI has a long list of properties that may be used to generate image contrast. By variation of scanning parameters, tissue contrast can be altered and enhanced in various ways to detect different features. (See Applications above.)
MRI can generate cross-sectional images in any plane (including oblique planes). In the past, CT was limited to acquiring images in the axial (or near axial) plane. The scans used to be called Computed Axial Tomography scans (CAT scans). However, the development of multi-detector CT scanners with near-isotropic resolutio
n, allows the CT scanner to produce data that can be retrospectively reconstructed in any plane with minimal loss of image quality.
For purposes of tumor detection
and identification in the brain
is generally superior
. However, in the case of solid tumors
of the abdomen and chest, CT is often preferred
due to less motion artifact. Furthermore, CT usually is more widely available, faster, much less expensive, and may be less likely to require the person to be sedated or anesthetized.MRI
is also best suited for cases when a patient is to undergo the exam several times successively in the short term
, because, unlike CT, it does not expose the patient to the hazards of ionizing radiation.http://en.wikipedia.org/wiki/Magnetic_resonance_imaging#MRI_versus_CT