Faculty of Medicine and Health Sciences
Department of Circulation and medical imaging

Strain rate imaging.

Myocardial deformation mechanics.

Revised edition 2023


Asbjørn Støylen, Professor, Dr. Med


Portal to deformation imaging and myocardial mechanics for the novice researcher and curious clinician

Old town bridge, Trondheim. Also called the "portal of happiness".

Follow updates on Mastodon: @strain_rate@med-mastodon.com

Welcome to the emerging revised strain rate website

The strain rate website has become fairly tangled in the process of editing single paragraphs at a time. Thus, I will attempt to revise the text for better legibility. I will keep the formats of sections, for quicker uploading, but get rid of duplications as well as reducing the number of sections. The index portal will be simplified, and just contain the index to the sections without text, and few pictures.

Animations will still be in *.GIF format, so they will run on web browsers, and can be embedded in presentations. Pictures and animations are still free to use, with due credit.

Strain and strain rate are the concepts of myocardial deformation. My basic views are still that

Recent additions:

November 10th. Global longitudinal strain is the most commonly used deformation measure of LV global function. The definition gives the GLS as negative values, and more negative values means more contraction. Should GLS be given in signed or numerical values (numerical values of GLS are the relative longitudinal shortening)? This is discussed here.

Website index:

Basic concepts of motion and deformation

This section replaces the two old sections:

Basic physiology

This section deals with the basic physiology as seen with various echo methods, and replaces most of
In the physiological aspects, as these were largely overlapping anyway.

Basic ultrasound

This section is still under revision, and replaces the sections on

Strain ultrasound
Problems and pitfalls


have been updated, especially in the order they are given.


I'll blog short #Cardiotoots related to #EchoFirst paragraphs in the website here on the front page, as well as on social media. Older toots will be collected in an archive file.

The newest #Cardiotoot:

November 10th: Thread on using signed versus numerical values for strain and strain rate.