A software tool that can efficiently describe MRI pulse sequences in Python has been developed for a fast MRI simulator. The essential part of this tool consists of application program interface (API) developed in C++, and any pulse sequence can be written by calling the API from a Python program. Using this tool, several pulse sequences including magnetic resonance fingerprinting were developed, and their usefulness was evaluated by performing MRI simulations for numerical phantoms. As a result, the tool developed in this study was shown to be very efficient in developing MRI pulse sequences.
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