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CAT Scan vs. MRI

Submitted by on January 13, 2011 – 2:09 amNo Comment

Brief and clear-cut details about what disparities exist between MRI & CAT scans.

Functioning of CT Scan vs MRI

CT (Computerized Axial Tomography) Scan

  • It deploys X-rays for generating pictures of the body, inclusive of the bone constitution.
  • The source of X-rays – the tube would revolve about the person who lies flat on a table. The X-ray detector is located on the opposing part of the person from the tube which receives the shaft which passes via the person. Sampling of the shaft is done through over seven hundred channels. The signalling reception by every channel is then digitised to a sixteen bits value & conveyed to the re-constructing processor. Measuring is done around a thousand times/sec. Scan rotary motions are generally one to two seconds in length. Greater the sampling or views, more enhanced quality the images.

MRI Scanning

  • Uses a potent magnet & pulsing RF waves for reading energy that water molecules produce as they wrongly line up following every radio frequency alignment pulse.
  • Reconstruction of accrued information is done into 2-D picture via any axis of the body. The blackish areas in the pictures are basically the almost arid bone make-up hence not generating any picture info. MRI scanning is ideal to get images of soft tissues.

CT Scan vs MRI - MRI Pros

  • CT scanning utilizes X-ray for constructing images. MRI scanning deploys magnetic fields for doing the analogous task & having no established side-effects associated to radiation exposure.
  • MRI scanning offers greater detailing of soft tissue.
  • Among MRI’s finest advantages is its capability of changing image contrast. Miniscule alterations in magnetic fields & RF waves could totally alter the picture contrast. Differing contrast settings facilitate highlighting varied tissue forms.
  • It is even capable of altering imaging plane while the person is totally motionless. Majority of the MRI devices could create pictures across varying planes.
  • MRI too uses contrasting agents though not iodine-based. There is lesser evidence of reaction to the contrasting agent in MRI & has greater safety as compared to dyes used in X-rays.
  • MRI is always better at detecting & identifying tumors, but CAT is generally more broadly obtainable, quicker, lesser costly & lesser likelihood of requiring sedation or anesthetizing the individual.
  • CAT might be improved through the usage of contrasting agent having constituent of greater atomic no. as compared to adjoining tissues like barium or iodine. In MRI scans, the contrasting agent possesses para-magnetic qualities – like gadolinium. Iodine usage might be linked to allergic responses.

CT Scan vs MRI – CT Pros

  • CAT helps to ably image bone make-up.

  • At times, a patient who has some implant like pacemaker, heart monitor, operative clip or metal fragment is ineligible for MRI.
  • CT scanning time is briefer in comparison to MRI.
  • MRI can trigger claustrophobia among some patients since they have to be inside a loud device for twenty to forty-five minutes.
  • It is lesser costlier as compared to an MRI.
Time neededGenerally done within five minutesMRI scan classically runs for around thirty minutes.
Level of radiation exposureMedium - highNot applicable
CostingBetween 1200-3200 dollars – generally costing lesser as compared to MRI scanning.Between 1200 to four thousand dollars (contrast included); that is generally costlier in comparison to CT scanning, X-ray & majority of the diagnostic techniques.
PrimerCT or CAT or computed tomography is a medical imaging method wherein X-rays are used for passing radiation via the body & then captured with detectors after which its computerized integration is done for obtaining cross-section images appearing on screens.MRI or magnetic resonance imaging is a prevalently deployed imaging method by radiologists for visualizing in-depth, lucid inner make-up & restricted role of the body.
Impact on our bodiesIn spite of being smallish, CAT is capable of posing irradiation risks.
None so ever cited in MRI usage.
Range of useIt is capable of outlining bone within the body with great accuracy.It has greater versatility as compared to X-rays & deployed for examination of a wide-ranging array of medical problems.
Principle deploy during imagingX-rayMagnetic field, RF waves.
Capability of changing imaging plane sans patients movement
Non-existentIt could create images across varying planes.
Soft tissue detailingLesser in comparison to MRI scan.
Greater detailing of soft tissue.
Bone structure detailingOffers good-enough detailing regarding bone make-up.Lesser detailing in comparison to CAT scan.
Permission FormNot necessary
TheoryIt uses magnetic fields.
Imagery detailsIllustrates fine disparities in-between the diverse types of soft-tissue.
It creates in depth images of tissue & brain.
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