How an MRI works?

 
Magnetic Resonance Imaging (MRI) is a non-invasive medical imaging technique used to produce detailed images of the internal structures of the body. It is particularly useful for imaging soft tissues, such as the brain, muscles, heart, and other organs, without the use of ionizing radiation like X-rays. Here's how an MRI works:How MRI Works
Magnetic Field Alignment: The MRI machine generates a strong magnetic field, which causes protons in the body's hydrogen atoms to align with the field. This is because protons behave like tiny magnets due to their spin and magnetic properties
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Radiofrequency Pulses: Once the protons are aligned, the MRI machine sends radiofrequency pulses to the area being examined. These pulses disturb the alignment of the protons, causing them to move out of their equilibrium positions
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Signal Emission: When the radiofrequency pulses are turned off, the protons return to their original alignment. As they realign, they emit radiofrequency signals. The rate at which they return to equilibrium and the signals they emit vary depending on the type of tissue
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Image Formation: The emitted signals are detected by receiver coils and processed by a computer to create detailed images of the body's internal structures. These images can be displayed in different planes and can be used to distinguish between different types of tissues based on their signal characteristics
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Applications and Advantages
Diagnostic Tool: MRI is used for diagnosing a wide range of conditions, including brain and spinal cord abnormalities, tumors, joint injuries, and heart conditions. It is particularly effective for imaging soft tissues
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Functional MRI (fMRI): This specialized MRI technique measures and maps brain activity by detecting changes in blood flow, helping to identify functional areas of the brain
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Safety: MRI does not use ionizing radiation, making it a safer alternative to CT scans in many cases. However, it is not suitable for patients with certain metal implants due to the strong magnetic field
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Overall, MRI is a powerful imaging tool that provides high-resolution images of the body's internal structures, aiding in the diagnosis and treatment of various medical conditions.