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Magnetic resonance
imaging (MRI)
MRI, images, MRI_of_Human_Brain,…
Magnetic resonance
imaging (MRI)
Clinical Applications
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Brain, spinal cord, nerves, muscles, ligaments and tendons is clearer in MRI image than x-rays and CT
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Basic Components in MRI
Gradient Coils
The gradient coils create a variable field (x, y, z) that can be increased or decreased to allow specific and different parts of the body to be scanned by altering and adjusting the main magnetic field.
There are three different gradient coils that produce three different magnetic fields, each less strong than the main field.
Radio Frequency (RF) coils
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There are different coils located inside the MRI scanner to transmit waves into different body parts.
Antenna/Computer System
The antenna is a sensitive device that detects the RF signals emitted by the patient's body and feeds this information into the computer system
The computer system receives, records, and analyzes the images of the patient's body that have been scanned, and helps to produce an understandable image.
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Transverse Magnetization
A 90-degree RF pulse creates an imbalance in the proton forces, resulting in a decrease in LM and an increase in magnetization in the transverse plane, forming a transverse magnetization (TM) vector.
MRI room set-up
Equipment Room
Components of the cooling system for the magnet, amplifiers, and gradient coils, including a cryocooler compressor and a heat exchanger.
Located immediately adjacent to the Magnet Room, this contains devices that control and support the magnet operation.
Control Room
This is immediately outside the magnet room and contains the operator console, keyboard, communication devices, oxygen monitors, and computer equipment that controls the scanner.
Magnet Room
The floor able to support heavy weight, because MRI weight is 4500 kg, 7500 kg
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Principles of MRI
History of MRI
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Definition
A medical imaging technique that uses a magnetic field and computer-generated radio waves to create detailed images of the organs and tissues in your body
Clinical Safety
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Patient need to complete the questionnaire, whether they have metal or electronic device in the body
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