Computer Axial Tomography (TAC) and Magnetic Resonance (MRI) are two imaging techniques widely used in medicine. Although both allow for detailed images of the inside of the body, they differ in their operation, applications and specific considerations.
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Main Differences between TAC and Magnetic Resonance
1. Technology Used:
- TAC: Use ionizing radiation (X-rays) to generate transversal images of the body. A broken scanner around the patient, capturing multiple projections that a computer processes to create detailed images.
- Magnetic Resonance: Use powerful magnetic fields and radio waves to align the hydrogen atoms in the body. By interrupting this alignment with a radio frequency signal and then measuring the energy released when realigning, high-resolution images are obtained without the use of ionizing radiation.
2. Duration of the test:
- TAC: It is a fast technique; exploration is usually completed in about 10 to 30 minutes.
- Magnetic Resonance: Generally, MRI requires more time, with a duration of between 30 and 90 minutes, depending on the complexity of the study.
3. Image Quality and Clinical Applications:
- TAC: It is especially effective to visualize bone structures, detect internal bleeding, identify lung tumors and evaluate abdominal injuries.
- Magnetic Resonance: It offers more detailed images in soft tissues, ideal for assessing the brain, spinal cord, muscles, ligaments and internal organs. It is the preferred technique for diagnosing soft tissue lesions and neurological diseases.
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4. Security considerations:
- TAC: It involves exposure to ionizing radiation, which can lead to cumulative risks if multiple scans are performed.
- Magnetic Resonance: It does not use ionizing radiation, but due to the use of powerful magnetic fields, it is contraindicated in patients with non-compatible metal implants, pacemaker or certain medical devices. Furthermore, it is essential that the patient does not carry metal objects during the test.
5. Feelings during the test:
- TAC: The team is more open and silent, which is often more comfortable for patients with claustrophobia.
- Magnetic Resonance: The patient is introduced into a narrow tube and the machine produces strong noises during the acquisition of images, which can cause discomfort in some individuals.
6. Cost and availability:
- TAC: It is generally more accessible and cost-effective due to the reduced complexity of the equipment and the speed of the procedure.
- Magnetic ResonanceIt is often more expensive, both for the cost of equipment and for the duration of the study and the need for specialized staff.
In short, both TAC and Magnetic Resonance are valuable tools in medical diagnosis. The choice between one or the other depends on the nature of the pathology to be evaluated, the characteristics of the patient and safety considerations. It is essential that the indication of each test be made by a medical professional, who will determine the most appropriate option depending on each particular case.
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