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MRI stands for magnetic resonance imaging. It is a form of medical imaging that does not require the use of radiation. Instead, it uses a combination of powerful magnetic fields, radio waves, and computerized technology to create a detailed image of your body structures.
A CT scan uses a large machine shaped like a large donut to take x-rays from many angles. A computer then takes the x-rays and creates many detailed pictures of the inside of your body. Each picture looks like a slice taken from one part of your body. The computer can also create a 3-D image of the inside of your body.
- Computed Tomography
- What Is an MRI?
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- CT Scan(CAT Scan, Computerized Axial Tomography)
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Reading CT scan images requires a good knowledge of anatomy and a sound sense of the orientation of different body structures. It requires a few years of training and study to learn how to properly interpret a CT scan and make a clinical diagnosis from it. However, it is always helpful to keep the following tips in mind when a CT scan is being interpreted:
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What Is an MRI?
T2-weighted sequences have long TRs and long TEs. In T2-weighted sequences, tissues have the following appearances:
For pregnant women and children, doctors try to use other tests unless CT is the best way to find a dangerous health problem.
An MRI is similar to a CT scan (computed tomography) in that it produces cross-sectional images of the body. MRI uses a strong magnetic field and radio waves to produce very clear, detailed computerized images of the inside of the body, while a CT scan uses X-rays to produce the images.
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The data from the detector is then transmitted to the computer. Data obtained from one complete rotation of the X-ray source is reconstructed using mathematical techniques. The reconstructed image appears as a two-dimensional, cross sectional image ‘slice’ of the body part. Each slice can vary from 1 mm to 10 mm in thickness, depending on the type of machine used. The next rotation of the source brings out a different slice of the body. Several such rotations occur, until a series of slices representing the entire body part is obtained. These slices may be stacked together to obtain a three dimensional image of the body part.
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When to Seek Medical Care
T2-weighted sequences can also be taken in the fat suppressed mode. This allows the detection of edema or inflammatory fluid in fatty tissues. In addition to this, there is another mode called the ‘fluid attenuation’ mode. In this mode, the signal coming from normal body fluids is suppressed. This is useful in the detection of brain edema, where the signal coming in from cerebrospinal fluid would be suppressed.
A CT scan exposes you to more radiation than a plain x-ray X-Rays An x-ray is an imaging test that takes a picture of the inside of your body. It uses a low dose of x-ray radiation. X-rays show body parts according to how dense (solid) they are. Doctors usually. read more . For example, a CT of the abdomen uses about 300 to 400 times the amount of radiation used for a single-view x-ray of the chest. Doctors try to limit the total amount of radiation you’re exposed to over your lifetime. Too much radiation can raise your chance of getting cancer.
Symptoms include itching and difficulty breathing or swallowing. If contrast leaked under the skin, the patient should look for increased redness, swelling, or pain. Patients will often be asked to come back the next day so their skin can be checked. There are no side effects of the exam itself, but patients who have multiple CT scans should discuss the radiation exposure with their physician.
CT Scan(CAT Scan, Computerized Axial Tomography)
CT and MRI images are acquired in a special digital format, called the DICOM format. DICOM ensures that the high quality of the images is retained. Each CT or MRI scan contains multiple images in the DICOM format that need to be stored in a safe and secure manner.
The reaction to the contrast is almost always immediate, so it is very rare to have a reaction after the patient leaves the facility. However, if a patient thinks they are having a delayed reaction to the contrast, they should call the facility where they had the exam.
Prior to most CT scans of the abdomen and pelvis, it is important to drink an oral contrast agent that contains dilute barium. This contrast agent helps the radiologist identify the gastrointestinal tract (stomach, small and large bowel), detect abnormalities of these organs, and to separate these structures from other structures within the abdomen. The patient will be asked to drink slightly less than a quart spread out over 1.5 to 2 hours.
Here’s All That You Need to Know about CT and MRI Imaging
CT scanners first began to be installed in 1974. CT scanners have vastly improved patient comfort because a scan can be done quickly. Improvements have led to higher-resolution images, which assist the doctor in making a diagnosis. For example, the CT scan can help doctors to visualize small nodules or tumors, which they cannot see with a plain film X-ray.
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You can go back to your usual activities.
To get your bearings, hold the film in front of you and begin at the part of the image that lies in the 9 o’clock position. This is right, 12 o’clock is anterior, 3 o’clock is left, and 6 o’clock is the posterior part of the cross-section.