Gastrointestinal Electrical Mapping Suite: Home

rt

Gastrointestinal Electrical Mapping Suite (GEMS) is a software package for the analysis of high-resolution (multi-electrode) gastrointestinal electrical recordings.

See "What can GEMS do?" for a list of software functions or download the user manual.   

This site contains links, updates and documentation for the GEMS users communities.

The management and distribution of GEMS was recently taken over by FlexiMap. For information about how to access GEMS for academic or commercial use, please contact FlexiMap directly.

GEMS Software Demonstration:

GEMS Demo


GEMS News

* 30 July 2015
"The impact of surgical excisions on human gastric slow wave conduction, defined by high-resolution electrical mapping and in-silico modeling", a paper by Du et al, using GEMS, has been accepted for publication in Neurogastroenterology & Motility.  Refer publications page for details.

"A theoretical study of the initiation, maintenance and termination of gastric slow wave re-entry", a paper by Du et al using GEMS, is being published in Mathematical Medicine and Biology.  Refer publications page for details.

* 1 July 2015
"Loss of interstitial cells of Cajal and patterns of gastric dysrhythmia in chronic unexplained nausea and vomiting." a paper by Angeli et al, has just been published in Gastroenterology.  Refer publications page for details.

* 1 April 2015
"Multi-channel wireless mapping of gastrointestinal serosal slow wave propagation", a paper by Paskaranandavadivel et al, has just been published in Neurogastroenterology & Motility.  Refer publications page for details.

* 1 January 2015
"Gastric arrhythmias in gastroparesis: low and high resolution mapping of gastric electrical activity", a paper by O'Grady et al that highlights the use of GEMS, is being published in Gastroenterology Clinics of North America.  Refer publications page for details. 

*1 October 2014
"Recent progress in gastric arrhythmia: pathophysiology, clinical significance and future horizons", a paper by O'Grady et al that discusses the use of GEMS, has been published in Experimental Pharmacology & Physiology.  Refer publications page for details.

"A system and method for online high-resolution mapping of gastric slow wave activity", a paper by Bull et al that uses GEMS has been published in IEEE Transactions on Biomedical Engineering.  Refer publications page for details.

*1 January 2014
"Automated identification of slow wave propagation patterns in gastric dysrhythmia", a paper by Paskaranandavadivel et al that uses GEMS has been published in Annals of Biomedical Engineering.  Refer publications page for details.

* 21 November 2013
Gems v1.6 released; see release notes for details.

* 17 June, 2013
"The biophysical basis and validity of GI extracellular recordings", a paper by Angeli et al, using GEMS, has been published in the Journal of Physiology.  Refer publications page for details.

* 27 April, 2013
"Automated algorithm for GI spike burst detection and demonstration of efficacy in ischemic small intestine", a paper by Jon Erickson and colleagues is now online in Annals of Biomedical Engineering.  Refer publications page for details.  This publication marks a successful new initiative in the GEMS project, to introduce GI spike detection methods.

* 26 March 2013
An editorial "Arrhythmias in the Gut" by Dr Wim Lammers is in press in Neurogastroenterology & Motility, accompanying the GEMS paper "Circumferential and functional re-entry of in-vivo slow wave activity in the porcine small intestine". 

* 11 March, 2013
"A miniature bidirectional telemetry system for in-vivo gastric slow wave recordings", a paper using GEMS,  has been selected by the editors of Physiological Measurement for the 'annual highlights' edition of the journal.

* 25 January, 2013
"Experimental and automated techniques for high-resolution electrical mapping of small intestine slow wave activity" by Angeli et al, using GEMS, is now in press with Journal of Neurogastroenterology & Motility. Refer publications page for details.

* 3 January, 2013
The paper "Circumferential and functional re-entry of in-vivo slow wave activity in the porcine small intestine" by Angeli et al, using GEMS, is now in press with Neurogastroenterology & Motility. Refer publications page for details.

* 15 August, 2012
The paper "Comparison of filtering methods for extracellular gastric slow wave recordings" has been accepted as a technical note in Neurogastroenterology & Motility.  Refer Publications page for details. 

* 3 July, 2012
The paper "Abnormal initiation and conduction of slow wave activity in gastroparesis defined by high-resolution electrical mapping", using GEMS, has been highlighted as 'lead news article' in the July edition of Nature Reviews Gastroenterology & Hepatology.

* 25 May, 2012
"Abnormal initiation and conduction of slow wave activity in gastroparesis defined by high-resolution electrical mapping", a paper using GEMS, is In Press with Gastroenterology.  Refer Publications page for details.

* 20 May, 2012
"A miniature bidirectional telemetry system for in-vivo gastric slow wave recordings", a paper using GEMS, is In Press with Physiological Measurement, and has been selected as an open-access 'feature article' by the editors.  Refer Publications for details.

* 15 May, 2012
A paper describing GEMS has been accepted to BMC Gastroenterology, outlining the software, its utilities and features, and with screenshots; Link: http://www.biomedcentral.com/1471-230X/12/60.  Refer Publications page for details.

* 1 May, 2012
"Rapid high-amplitude circumferential gastric slow wave propagation during normal gastric pacesetting and dysrhythmia", a paper using GEMS, is In Press with Neurogastroenterology & Motility.  Refer Publications page for details.

*19 Jan, 2012
The GEMS User Manual is now available from this site - see the Downloads page.

*11 Jan, 2012
"An improved method for the estimation and visualization of velocity fields from gastric high-resolution electrical mapping", a paper describing methods used in GEMS, has been published in IEEE Transactions of Biomedical Engineering.  Refer bibliography.  

*14 Nov, 2011.
A GEMS demonstration video has been uploaded to allow visitors to experience several GEMS features in action. Thanks to Nira P.

* 14 Nov, 2011.
GEMS video examples link added, displaying example high-resolution mapping outputs achieved using the GEMS animation feature. 

* 1 Sept, 2011.
Dr. Rita Yassi, who has made an outstanding contribution to GEMS development, has left for a position at Orion Health.  Good luck Rita and thanks for all your work on GEMS!

* 25 Aug, 2011.
GEMS v1.5 released (internally): see release notes.

* 24 Aug, 2011.
"High-resolution spatial analysis of slow wave initiation and conduction in porcine gastric dysrhythmia", a paper using GEMS, has been published in Neurogastroenterology & Motility, and received an editorial focus by Dr K. Koch entitled "The Electrifying Stomach".

* 27 June, 2011.
GEMS v1.3 released: see release notes.

* 20 June, 2011.
Papers describing new GEMS features will be presented at the IEEE EMBS Conference, Boston 2011.  Details have been added to the bibliography.

* 19 May, 2011
The second experimental paper employing GEMS has been accepted in Neurogastroenterol Motil. Details in bibliography.

* 18 April, 2011
GEMS v1.2 released. Please refer to the Release Notes for a list of updated features, and fixed bugs.

* 25 Mar, 2011
GEMS v1.1 released. Please refer to the Release Notes for a list of updated features, and fixed bugs.

* 21 Feb, 2011
GEMS v1.0 released. Please refer to the Release Notes for a list of updated features, and fixed bugs.

* 11 Feb, 2011
GEMS v0.9 released. Please refer to the Release Notes for a list of updated features, and fixed bugs.

* 9 Feb, 2011
An Electrodes page has been added to this site, describing flexible printed circuit board (PCB) electrodes used in clinical HR mapping.

* 4 Feb, 2011
GEMS v0.8 released.  Includes improved velocity and amplitude algorithms and marks can now be added in manual cluster mode.  New filtering and baseline removal methods have also been implemented.

* 26 Jan, 2011
The first experimental paper employing GEMS has been published in Physiological Measurement. Details in bibliography.

* 12 Jan, 2011
GEMS v0.6 has been released; see release notes.

* 8 Jan, 2011
A paper describing the REGROUPS algorithm for slow wave clustering, and its validation, has been published by Erickson et al. in the Jan. edition of Annals of Biomedical Engineering. See bibilography for full details.

Copyright © Auckland UniServices Ltd and Jonathan C Erickson 2010-11.  
We thank the American Society of Neurogastroenterology and Motility (ANMS), the NZ Health Research Council, and the NIH for funding the researchers who have contributed to this work.