Physics: Pulse Sequences

Tell Me What You Want! What You Really ,Really, Want!!!

Pulse sequences form the architectural component of our jobs. It is where we build our image using the given parameters. There are many pulse sequences to choose from and each of them have their own advantages and disadvantages.

It is important to select the right pulse sequence so that we can enhance our understanding of what we need and what we can give up. This, ultimately, helps us to obtain the image(s) as prescribed/ordered by the attending radiologist and/or supervising physician. 

Spin echo

The spin echo is the pulse sequence that helps us obtain  higher quality images in terms of image contrast. The ability to produce true T2 contrast is appealing. But the longer scan times, may make this set of imaging sequences less desirable, given our patients’ conditions and clinical situations..

Gradient Echo

The gradient echo paves the way for faster imaging and/or shorter scan times. However; the images obtained from gradient echo imaging, depict a large number of artifacts. Gradient echo images also highlight T2* contrast. 

While attempting to image faster, we should also consider utilizing other techniques, so as to strike the right balance between said parameters and  chosen trade-offs.

Echo Planar Imaging (EPI)

The EPI sequences may contribute to artifacts into our image(s). However; this type of sequencing, does provide us with unique data sets.

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