What is merge sequence in MRI?
What is merge sequence in MRI?
Newly developed (MERGE/MEDIC/M-FFE) combination sequence is another MRI sequence useful in imaging of articular cartilage [15]. MERGE (“Multiple Echo Recombined Gradient Echo”) is a spoiled T2* weighted sequence for spinal and musculoskeletal imaging developed by GE Healthcare.
What is a T2 medic?
Multiple Echo Data Image Combination (MEDIC) is a T2* weighted spoiled gradient echo sequence. Multiple echoes acquired in one measurement are combined into an image. This sequence uses flow compensation unipolar frequency encoding gradients that removes CSF flow artefacts.
What is SPGR MRI sequence?
An SPGR sequence spoils the transverse steady state by semi-randomly changing the phase of the RF pulse, resulting primarily in T1 or PD contrast. The related FLASH sequence uses a random spoiler gradient to produce a phase shift and spoil the steady state.
What kind of two main sequences we have in MRI?
The most common MRI sequences are T1-weighted and T2-weighted scans. T1-weighted images are produced by using short TE and TR times. The contrast and brightness of the image are predominately determined by T1 properties of tissue. Conversely, T2-weighted images are produced by using longer TE and TR times.
What does lava stand for in MRI?
Purpose: To study liver imaging with volume acceleration-flexible (LAVA-Flex) for abdominal magnetic resonance imaging (MRI) at 3.0 T and compare the image quality of abdominal organs between LAVA-Flex and fast spoiled gradient-recalled (FSPGR) T1-weighted imaging.
What is a merge sequence?
MERGE (“Multiple Echo Recombined Gradient Echo”) is a spoiled T2*-weighted sequence for spinal and musculoskeletal imaging developed by GE Healthcare. The corresponding Siemens sequence is called MEDIC (“Multi-Echo Data Image Combination”), while the Philips sequence is called M-FFE (“Merged Fast Field Echo”).
What is a haste MRI?
Half-Fourier-Acquired Single-shot Turbo spin Echo (HASTE) is a Turbo spin-echo technique that is used for sequential acquisition of high-resolution T2-weighted images. HASTE uses a single-shot technique to acquire sufficient data for an entire image from a single TR.
What is a Trufi sequence?
True FISP is the Siemens trade name for a steady-state coherent sequence in which balanced gradients are used along all three axes. “Balanced” means that the net gradient-induced dephasing over a TR interval is zero.
What does SPGR stand for?
SPGR
| Acronym | Definition |
|---|---|
| SPGR | Spoiled Gradient Recalled |
| SPGR | Specific Gravity |
| SPGR | Sprenggranate (German: Explosive Shell) |
| SPGR | Systematizing Person-Group Relations |
How many sequences are there in MRI?
There are two main sequence families, depending on the type of echo recorded: spin echo sequences and gradient echo sequences. There are two main sequence families, depending on the type of echo recorded: spin echo sequences, characterized by the presence of a 180° rephasing RF pulse. gradient echo sequences.
How do I know if my MRI is T1 or T2?
T2-weighted image – Anatomy (spine)
- T2 images are a map of proton energy within fatty AND water-based tissues of the body.
- Fatty tissue is distinguished from water-based tissue by comparing with the T1 images – anything that is bright on the T2 images but dark on the T1 images is fluid-based tissue.
What is a vibe in MRI?
Volumetric Interpolated Breath-hold Examination (VIBE) sequence is a modified form of FLASH sequence, which permits dynamic and high-resolution imaging under 30 seconds breath-hold.
How does merge work for spinal imaging?
We have been using a sequence called MERGE for spinal imaging that shows excellent contrast between cord, CSF and disk. How does this work? MERGE (“Multiple Echo Recombined Gradient Echo”) is a spoiled T2*-weighted sequence for spinal and musculoskeletal imaging developed by GE Healthcare.
Are T2-weighted FSE sequences complementary to merge in the diagnosis and management?
CONCLUSION. MERGE and T2-weighted FSE sequences are complementary. MERGE provided greater sensitivity for cord lesions whereas axial T2-weighted FSE provided improved lesion specificity. Further investigation is required to assess the clinical impact of MERGE in the diagnosis and management of MS.
What can 3D merge do for You?
3D MERGE also offers excellent SNR and fat-saturation capabilities to provide high resolution, isotropic T2* weighted images of the extremities (hand, wrist, knee, ankle, and shoulder) with optimized contrast between the ligaments and soft tissue.
Does merge improve the diagnosis and management of multiple sclerosis (MS)?
MERGE provided greater sensitivity for cord lesions whereas axial T2-weighted FSE provided improved lesion specificity. Further investigation is required to assess the clinical impact of MERGE in the diagnosis and management of MS. Adult Artifacts Case-Control Studies
