MRIcontrast Pro

February 4, 2021

- The gradient echo protocol now has RF-spoiling which can be turned on and off. - A new steady-state free precession (SSFP-Echo) protocol has been added. - All major types of gradient echo sequences can now be simulated. - All protocols (sequences) now obey timing limitations set by the MRI scanner hardware (finite RF-pulse durations, gradient switching times, etc). - Minor user interface enhancements. - Bug fixes.

January 26, 2021

Version 2.0 is a major upgrade. Several useful, but also cool, features have been added. For the first time, one can listen to the sound that is produced by the MRI scanner while the sequence is running! The new features include: - The sound generated by the gradients can now be played by the app. The sound will change in real time when any parameters are modified. - An option to restore the longitudinal magnetization has been added to spin echo and turbo/fast spin echo sequences. - The user interface has been changed slightly, to make more efficient use of the screen size, so that more features can be added in future versions. - For EPI sequences, the effective bandwidth along the phase-encoding direction is now displayed together with the readout bandwidth. (Thanks Jochen!) - The calculations of timings, e.g., limits of echo times and repetition times, have been made more realistic, to respect the hardware limitations of a real MRI-scanner. - The signal calculation of the turbo spin echo sequence (TSE/FSE) has been made more accurate, and the user interface is more responsive. - Various minor bug fixes.

July 30, 2020

- A new dataset containing vials with different T1 and T2 relaxation times has been added. - All datasets have now an info button, which shows information about the specific features of the dataset and which protocols are available for use. - A new protocol, FLAIR, or 'dark fluid', has been added. The protocol is bundled together with the STIR protocol. - Fixed a GUI bug when STIR/FLAIR was used with the option "Freeze suppressed tissue".

January 2, 2020

- Fixed a bug which prevented in-app purchases in version 3.1. - The EPI protocols work with iOS 13.3.

December 2, 2019

- A preferences menu has been added. - In the preferences, it is possible to set the names of the MRI protocols according to Siemens, Philips, or GE style. - Bug fixes and user interface enhancements. NOTE: it is known that some users could not use the EPI protocols. We cannot reproduce this bug, neither on simulators, nor on physical devices. We are working with Apple to resolve the problem.

November 21, 2019

- Bugfixes for EPI.

November 18, 2019

A major revision with many improvements, including: - The spectacular True FISP pulse sequence can now be simulated, including banding artifacts! Try to change repetition time and flip angle, it is really cool! - A new version of the brain dataset is available to support True FISP simulation with 512-matrix. The old dataset can still be used, but only with 128-matrix. - A mathematical phantom is included, which is nice to explore the properties of especially the EPI and True FISP protocols. - Numerous bug fixes and performance enhancements.

October 31, 2019

- Support for iOS 13 dark mode (light mode support will come soon). - Bugfix: Corrected bug which prevented the EPI protocol from running.

May 10, 2019

- In the STIR protocol, it is now possible to "freeze" the suppressed tissue, by automatic adjustment of the inversion time (TI) when the repetition time (TR) is changed. - Bugfix: It is no longer possible to set TI longer than TR.

May 2, 2019

- All MRI protocols now have thorough descriptions of its features, including hints of how to explore its contrast behavior. The underlying physical principles are also explained. - The frequency-encoding direction of the data set is now indicated in the image. - Bug fixes of the user interface.

Relaxation vials

MRI dataset: vials with varying T1 and T2

GRE-EPI sequence

A GRE echo planar imaging sequence

SE-EPI sequence

A SE echo planar imaging sequence

Knee coronal dataset

MRI dataset with 8 imaging protocols

Thigh transversal

MRI dataset

Inversion recovery (SE)

An inversion recovery spin echo sequence

DWI sequence

An EPI diffusion weighted imaging sequence

Foot sagittal

MRI dataset

Wrist coronal

MRI dataset

Gradient echo

A spoiled gradient echo sequence

Turbo spin echo

A turbo spin echo sequence

Brain OM-plane v2

An MRI dataset supporting hi-res True FISP

Brain OM-plane

MRI dataset