What is echo planar imaging used for?
Echo-planar images with resolution and contrast similar to those of conventional MR images can be obtained by using multishot acquisitions in only a few seconds. Although primarily used for imaging the brain, echo-planar imaging can be applied to many anatomic regions of the body, such as the heart and abdomen.
What is planar imaging?
Planar imaging is the acquisition of 2D nuclear images, similar to plain films in x-ray imaging.
What is MRI EPI?
The echo planar (EPI) is the fastest acquisition method in MRI (100 ms / slice), but with limited spatial resolution. It is based on: an excitation pulse, possibly preceded by magnetization preparation.
What is difference between SPECT and pet?
The main difference between SPECT and PET scans is the type of radiotracers used. While SPECT scans measure gamma rays, the decay of the radiotracers used with PET scans produce small particles called positrons. A positron is a particle with roughly the same mass as an electron but oppositely charged.
What is a planar study?
The study of theoretical “mathemagic”. Planar Studies is built upon formulae and proofs so strong that they can alter the nature of reality and break its bounds. Planar Mages use magic to perform their calculations, but their formulas themselves operate on physical laws, rather than magic.
What is the primary advantage of gradient echo over spin echo imaging?
What is the primary advantage of gradient echo over spin echo imaging? Higher temporal resolution.
What are advantages of using gradient echo sequences?
The advantages of low-flip angle excitations and gradient echo techniques are faster acquisitions, new contrasts between tissues and a stronger MR signal in case of short TR.
What is the difference between an MRI and a functional MRI?
While an MRI scan allows doctors to examine a patient’s organs, tissue, or bones, “an fMRI looks at the function of the brain,” Dr. Zucconi explains.
What is the main difference between an MRI scan and an fMRI scan?
What’s the Difference Between MRI and FMRI? FMRI scans use the same basic principles of atomic physics as MRI scans, but MRI scans image anatomical structure whereas FMRI image metabolic function. Thus, the images generated by MRI scans are like three dimensional pictures of anatomic structure.
How is echo planar imaging performed?
Reference article, Radiopaedia.org. (accessed on 18 Sep 2021) https://radiopaedia.org/articles/19116 Echo planar imaging is performed using a pulse sequence in which multiple echoes of different phase steps are acquired using rephasing gradients instead of repeated 180 degree radiofrequency pulses following the 90°/180° in a spin echo sequence .
What is the role of echo-planar imaging in the evaluation of arrhythmias?
Cine imaging of the heart is performed with GRE echo-planar imaging over multiple cardiac cycles. When single-shot echo-planar imaging is used, electrocardiographic gating is not required. Therefore, this technique is particularly helpful in patients with arrhythmias. GRE echo-planar imaging can also be used for T2*-weighted perfusion studies.
What is the difference between echo-planar imaging and cardiac perfusion imaging?
GRE echo-planar imaging can also be used for T2*-weighted perfusion studies. Cardiac perfusion imaging involves first-pass imaging after administration of a contrast material bolus and is used for evaluation of myocardial ischemia.
What are the different variants of echo-planar imaging?
Today, echo-planar imaging has many variants. In one of these variants, asymmetric echo-planar imaging, data are collected only during the positive frequency-encoding gradient lobe. The negative frequency-encoding gradient lobe is used to just traverse back to the other side of k space (, 9 ).