James, What are the specific active components that you believe are contributing to the receiver gain drift, with a behavior approximated by y = a +b*ln(x +c)? Transistors? Amplifier ICs? etc.? (Is x time or temperature?)
Jeff Stokes San Diego USA -----Original Message----- From: James Ewing <[email protected]> Sent: Wednesday, August 6, 2025 6:19 PM To: [email protected] Subject: Curve fitting function There’s a function suggested in Image->Stacks->Plot Z-axis Profile, under the Data/Add_Fit button that I’ve found to be very useful for fitting data in MRI studies that have a receiver gain drift due to heating of some active components in the receiver coil. The function is y = a +b*ln(x +c). I’ve been looking for a reference (citation) to this function’s use, but haven’t found anything specific on the web. Can someone tell me where this function was suggested as an heuristic function for fitting heating of electronic components? - James Ewing -- ImageJ mailing list: http://imagej.nih.gov/ij/list.html -- ImageJ mailing list: http://imagej.nih.gov/ij/list.html
