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Having reviewed spin echo and gradient echo pulse sequences, let's turn our attention to inversion recovery pulse sequences. Inversion recovery sequences serve to null signal coming from tissues with a predetermined T1 relaxation constant.

A 180 degree radiofrequency pulse the net magnetisation vector into the antiparallel longitudinal plane. Once the RF pulse is switched off the spins will regain longitudinal magnetisation at different rates (depending on the T1 of the tissue). At certain intervals specific tissue will have a net zero longitudinal magnetisation. If a 90 degree radiofrequency pulse is applied at this interval (time of inversion) there will be no signal in the transverse plane from that particular tissue.

This is the basis for signal suppression in inversion recovery pulse sequences.

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*Not sure if the question banks are for you?*
If you're here, you're likely studying for a radiology physics exam. I've spent the last few months collating past papers from multiple different countries selecting the most commonly asked questions. You'll be surprised how often questions repeat themselves!

The types of questions asked in FRCR, RANZCR AIT, ARRT, FC Rad Diag (SA), ABR qualifying Core Physics and MICR part 1 are surprisingly similar and the key concepts remain the same throughout. I've taken the most high-yield questions and answered them in video format so that I can take you through why certain answers are correct and others are not.

Happy studying,
Michael

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