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Questions and Answers
What property of the nucleus does MRI make use of?
What is the main magnetic field in an MRI scanner denoted as?
What is the mathematical calculation used to change the electrical current in a coil into an image in MRI?
What type of images are used to detect disease and performed before T1 sequences?
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What is the main contrast mechanism in T1 weighted images?
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What is the main contrast mechanism in T2 weighted images?
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What is the time required for transverse magnetization to become zero in T2 relaxation time?
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What are the contraindications for MRI?
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What is the gold standard for assessing disc position and intraarticular degenerative disorders in TMJ imaging?
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Which type of image provides an excellent view of joint effusion and medullary bone edema in TMJ imaging?
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What does MR-sialography show in submandibular duct imaging?
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What type of coils are used for imaging intraoral hard and soft tissues?
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What structures are visible in MR images of intraoral hard and soft tissues?
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What is the main advantage of using intraoral coils for imaging intraoral hard and soft tissues?
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What imaging technique did not show gingiva and mucosa but delineated the inferior alveolar nerve?
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What is the unit of measurement for the strength of an MRI machine's magnet?
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What percentage of the human body is composed of water?
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What property of hydrogen atoms in water molecules does MRI use to generate detailed images?
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What is used to disturb the alignment of the hydrogen protons in the body during an MRI scan?
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What detects the energy emitted by the realigning protons during an MRI scan?
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What recovers after the radio frequency pulse in an MRI scan?
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What does the T1 relaxation time in MRI imaging reflect?
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What influences the appearance of tissues in MRI imaging scans?
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What reflects the decay of dipoles in the transverse plane in MRI imaging?
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What is involved in the MRI imaging process?
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What is the unit of measurement for the strength of the Earth's magnetic field?
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What is the speed at which protons spin affected by in an MRI scanner?
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Study Notes
MRI Technology and Imaging Process Explained
- MRI machines use a powerful magnetic field and radio frequency fields to produce detailed images of the body.
- The strength of an MRI machine's magnet is measured in Tesla (T), with most hospital scanners being 0.5T, 2T, or 3T, making them significantly stronger than the Earth's magnetic field.
- MRI measures the water content in different body tissues, as our bodies are composed of around 65% water, using the hydrogen atoms in water molecules to generate detailed images.
- Hydrogen protons in the body align with the scanner's main magnetic field when placed in an MRI scanner, and their spin is affected by the strength of the magnetic field.
- A radio frequency pulse is used to disturb the alignment of the protons, enabling the MRI scanner to measure the emitted energy from the protons.
- The speed at which protons spin varies in different tissues, and a coil placed around the body part being imaged detects the energy emitted by the realigning protons.
- The MR imaging process involves the patient becoming a magnet in the magnetic field, followed by the emission and detection of signals for image reconstruction.
- Following the RF pulse, the longitudinal magnetization (M2) recovers, and the transverse magnetization (Mxy) decays, with tissues having diverse relaxation times due to different macromolecular environments.
- The T1 relaxation time reflects the transfer of RF energy from spinning protons to the surrounding tissue lattice, with different tissues having different T1 relaxation times.
- The T2 relaxation time reflects the decay of dipoles in the transverse plane, with solid tissues having shorter T2 relaxation times due to strong local magnetic fields, and liquids having longer T2 relaxation times.
- The T1 relaxation time and T2 relaxation time of tissues influence their appearance in MRI imaging scans, with shorter T1 relaxation times resulting in brighter images in T1 weighted scans.
- The MRI imaging process involves sending a radio wave into the body, receiving the emitted signal, and using mathematical calculations to reconstruct the image.
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Description
Test your knowledge of MRI technology and the imaging process with this quiz. Explore the principles of magnetic resonance imaging, from the use of powerful magnetic fields to the role of hydrogen atoms in generating detailed images of the body's tissues.
