MRI sequence
MRI Sequence
MRI Sequence (pronunciation: /ɛm aɪ aɪ 'si:kwəns/) is a term used in Magnetic Resonance Imaging (MRI) to describe the particular setting of pulse sequences and pulse timing parameters designed to obtain a specific type of image.
Etymology
The term "MRI Sequence" is derived from the English words "Magnetic Resonance Imaging" and "Sequence". The term "Magnetic Resonance Imaging" was coined in the late 1970s, replacing the earlier term "Nuclear Magnetic Resonance Imaging" due to the negative connotations associated with the word "nuclear". The term "Sequence" refers to the order in which the magnetic pulses are applied during an MRI scan.
Definition
An MRI Sequence is a complex series of magnetic field pulses and radio frequency (RF) excitations, designed to gather specific types of data, which are then reconstructed into an image. The parameters of an MRI Sequence determine the contrast and clarity of the image, and can be adjusted to highlight different types of body tissues or abnormalities.
Types of MRI Sequences
There are many different types of MRI Sequences, each designed to image specific types of tissues or abnormalities. Some of the most common types include:
- T1-weighted sequence: This sequence is used to visualize anatomy in detail. It is particularly useful for imaging the brain, spine, and musculoskeletal system.
- T2-weighted sequence: This sequence is used to detect edema and inflammation. It is particularly useful for imaging the brain, spine, and musculoskeletal system.
- Diffusion-weighted sequence: This sequence is used to detect microscopic changes in water molecule diffusion, often used in stroke imaging.
- Gradient echo sequence: This sequence is used to detect hemorrhage and calcification.
Related Terms
- Magnetic Resonance Imaging: A type of imaging technique that uses magnetic fields and radio waves to create detailed images of the body.
- Pulse sequence: The specific order and timing of RF pulses and magnetic field gradients used in an MRI scan.
- T1-weighted sequence: A type of MRI sequence that provides high anatomical detail.
- T2-weighted sequence: A type of MRI sequence that is sensitive to changes in water content and can highlight areas of edema and inflammation.
- Diffusion-weighted sequence: A type of MRI sequence that measures the diffusion of water molecules to detect microscopic changes in tissue structure.
- Gradient echo sequence: A type of MRI sequence that is sensitive to changes in magnetic susceptibility and can highlight areas of hemorrhage and calcification.
External links
- Medical encyclopedia article on MRI sequence
- Wikipedia's article - MRI sequence
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