This page is preliminary and currently under construction.

J4 is a quantitative medical imaging software toolbox, focused primarily on PET, MRI and CT applications for cardiology. J4 is an outgrowth of the earlier I4 imaging system and utilizes JSim for quantitative modeling. J4 is developed at the University of Washington, in the departments of Bioengineering, Cardiology and Radiology.

QPP (Quantitative Perfusion Protocol) is J4's first target application. QPP is a software tool for measuring regional myocardial flow and coronary flow reserve from cardiac PET images. (AA: Need more complete description here). QPP development is funded, in part, via a grant from the Wallace H. Coulter Foundation.

Project status: QPP is currently undergoing alpha testing at UW. A beta version, suitable for use by collaborators is expected to be available by mid-2009. QPP currently runs only on Linux(i386 or X64) workstations. Windows and MacIntosh versions may be available in the future.


Model development and archiving support at provided by the following grants: NIH U01HL122199 Analyzing the Cardiac Power Grid, 09/15/2015 - 05/31/2020, NIH/NIBIB BE08407 Software Integration, JSim and SBW 6/1/09-5/31/13; NIH/NHLBI T15 HL88516-01 Modeling for Heart, Lung and Blood: From Cell to Organ, 4/1/07-3/31/11; NSF BES-0506477 Adaptive Multi-Scale Model Simulation, 8/15/05-7/31/08; NIH/NHLBI R01 HL073598 Core 3: 3D Imaging and Computer Modeling of the Respiratory Tract, 9/1/04-8/31/09; as well as prior support from NIH/NCRR P41 RR01243 Simulation Resource in Circulatory Mass Transport and Exchange, 12/1/1980-11/30/01 and NIH/NIBIB R01 EB001973 JSim: A Simulation Analysis Platform, 3/1/02-2/28/07.