Acronym Heaven
Monday, January 5th, 2009
Or acronym hell. A look at the (ab)use of the English language for marketing MRI acquistion pulse sequences and methods.
Diffusion Tensor Imaging Cheat Sheet
Sunday, May 18th, 2008
Here is a basic summary of what DTI is all about, and what some of those DTI parametric maps represent.
A one-page cheat sheet is at the end.
MRI Cryptic Crossword
Tuesday, December 18th, 2007
Announcing—a MRI puzzle for Christmas 2007… a MRI Physics Cryptic Crossword.
First prize is a 20q game, which is an incredible little device which can guess what you’re thinking, by asking twenty apparently inane questions like “Is it larger than a duck?”.
Submit your answers to crossword@revisemri.com. Go for it! Competition ended.
Building Blochs
Monday, December 3rd, 2007
Felix Bloch
Nobel Prize in Physics lecture, 11th December 1952:
“To follow the analogue of mechanical resonance we must now come back to relaxation, which can be seen to act like a friction, and which counteracts the tilt produced by the alternating field.”
Magnitude, real and phase images
Monday, November 26th, 2007
Not all clinical MR images are created equal.*
After the using the Fourier transform to transform our measured k-space data into image space, the image data is of complex type. This image data is then manipulated for different clinical utility. For example, a magnitude image is used to maximise the signal-to-noise ratio (SNR). Phase images are used to measure flow. Let’s look at how our MR signal is recorded and how these image types are calculated.