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| 'Transverse Relaxation Time' | |
Result : Searchterm 'Transverse Relaxation Time' found in 1 term [] and 3 definitions [], (+ 12 Boolean[] results
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Transverse Relaxation Time | |
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The T2 time constant, which determines the rate at which excited protons reach equilibrium, or go out of phase with each other. A measure of the time taken for spinning protons to lose phase coherence among the nuclei spinning perpendicular to the main field due to interaction between spins, resulting in a reduction in the transverse magnetization. The transverse magnetization value will drop from maximum to a value of about 37% of its original value in a time of T2. | | | | | | | • Share the entry 'Transverse Relaxation Time': | | | | |
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Chest MRI a viable alternative to chest CT in COVID-19 pneumonia follow-up Monday, 21 September 2020 by www.healthimaging.com | | |
CT Imaging Features of 2019 Novel Corona virus (2019-nCoV) Tuesday, 4 February 2020 by pubs.rsna.org | | |
Polarean Imaging Phase III Trial Results Point to Potential Improvements in Lung Imaging Wednesday, 29 January 2020 by www.diagnosticimaging.com | | |
Low Power MRI Helps Image Lungs, Brings Costs Down Thursday, 10 October 2019 by www.medgadget.com | | |
Chest MRI Using Multivane-XD, a Novel T2-Weighted Free Breathing MR Sequence Thursday, 11 July 2019 by www.sciencedirect.co | | |
Researchers Review Importance of Non-Invasive Imaging in Diagnosis and Management of PAH Wednesday, 11 March 2015 by lungdiseasenews.com | | |
New MRI Approach Reveals Bronchiectasis' Key Features Within the Lung Thursday, 13 November 2014 by lungdiseasenews.com | | |
MRI techniques improve pulmonary embolism detection Monday, 19 March 2012 by medicalxpress.com |
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(SE) The most common pulse sequence used in MR imaging is based of the detection of a spin or Hahn echo. It uses 90° radio frequency pulses to excite the magnetization and one or more 180° pulses to refocus the spins to generate signal echoes named spin echoes (SE).
In the pulse sequence timing diagram, the simplest form of a spin echo sequence is illustrated.
The 90° excitation pulse rotates the longitudinal magnetization ( Mz) into the xy-plane and the dephasing of the transverse magnetization (Mxy) starts.
The following application of a 180° refocusing pulse (rotates the magnetization in the x-plane) generates signal echoes. The purpose of the 180° pulse is to rephase the spins, causing them to regain coherence and thereby to recover transverse magnetization, producing a spin echo.
The recovery of the z-magnetization occurs with the T1 relaxation time and typically at a much slower rate than the T2-decay, because in general T1 is greater than T2 for living tissues and is in the range of 100-2000 ms.
The SE pulse sequence was devised in the early days of NMR days by Carr and Purcell and exists now in many forms: the multi echo pulse sequence using single or multislice acquisition, the fast spin echo (FSE/TSE) pulse sequence, echo planar imaging (EPI) pulse sequence and the gradient and spin echo (GRASE) pulse sequence;; all are basically spin echo sequences.
In the simplest form of SE imaging, the pulse sequence has to be repeated as many times as the image has lines. Contrast values:
PD weighted: Short TE (20 ms) and long TR.
T1 weighted: Short TE (10-20 ms) and short TR (300-600 ms)
T2 weighted: Long TE (greater than 60 ms) and long TR (greater than 1600 ms)
With spin echo imaging no T2* occurs, caused by the 180° refocusing pulse. For this reason, spin echo sequences are more robust against e.g., susceptibility artifacts than gradient echo sequences.
See also Pulse Sequence Timing Diagram to find a description of the components.
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