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Question

Which imaging device-conventional X ray, DSA, PET, ultrasound or MRT would be best for locating a brain tumor? Why?

Answer 1

Application

In clinical practice, MRI is used to distinguish pathologic tissue (such as a brain tumor) from normal tissue.

One advantage of an MRI scan is that it is HARMLESS to the patient.

It uses strong magnetic fields and non-ionizing radiation in the radio frequency range.

Compare this to CT scans and traditional X-rays which involve doses of ionizing radiation and may increase the risk of malignancy, especially in a fetus.

While CT provides good spatial resolution (the ability to distinguish two structures an arbitrarily small distance from each other as separate), MRI provides comparable resolution with far better contrast resolution (the ability to distinguish the differences between two arbitrarily similar but not identical tissues). The basis of this ability is the complex library of pulse sequences that the modern medical MRI scanner includes, each of which is optimized to provide image contrast based on the chemical sensitivity of MRI.

For example, with particular values of the echo time (TE) and the repetition time (TR), which are basic parameters of image acquisition, a sequence will take on the property of T2-weighting. On a T2-weighted scan, fat-, water- and fluid-containing tissues are bright (most modern T2 sequences are actually fast T2 sequences). Damaged tissue tends to develop edema, which makes a T2-weighted sequence sensitive for pathology, and generally able to distinguish pathologic tissue from normal tissue. With the addition of an additional radio frequency pulse and additional manipulation of the magnetic gradients, a T2-weighted sequence can be converted to a FLAIR (Fluid Light Attenuation Inversion Recovery) sequence, in which free water is now dark, but edematous tissues remain bright. This sequence in particular is currently the most sensitive way to evaluate the brain for demyelinating diseases, such as multiple sclerosis.

The typical MRI examination consists of 5-20 sequences, each of which are chosen to provide a particular type of information about the subject tissues. This information is then synthesized by the interpreting physician.

more about MRI:

Magnetic resonance imaging (MRI). An MRI uses electromagnetic waves to create computer-generated pictures of the brain. MRIs may create more detailed pictures than CT scans and are the preferred method of diagnosing a brain tumor. The use of intravaneous (IV) gadolinium-enhanced MRI may help to aid in the diagnosis. This is when the contrast (gadolinium) medium (a special dye) is given to the patient after the plain MRI has been completed, then another series of pictures are taken.

A spinal MRI may be used in diagnosing a spinal tumor.

A functional MRI (fMRI) provides information about the location of specific areas of the brain that are responsible for muscle movement and speech. During the fMRI examination, the patient is asked to perform certain tasks that can then result in detectable changes in the brain that are captured with the fMRI image.

Answer 2

MRI's will be the best followed by Petscan, then X-ray, then ultrasound. Ultrasound is the weakest frequency scanning machine that is why it is used to look at babies. MRI's are the strongest signal sent through the body of the 4 devices. That is why it is used to scan the whole body for problems. The devices all generate a different strength of signal used to penetrate and give a specific degree of information about what the doctor is looking for. For more info check out http://www.emfscience.net

Answer 3

a CAT scan in that it produces a 3d image that can be viewed from any angle

Answer 4

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