NIfTI stands for "Neuroimaging Informatics Technology Initiative," a file format used to store medical imaging data, including data from magnetic resonance imaging (MRI), computed tomography (CT), and positron emission tomography (PET) scans. It is a widely used format in the field of medical image analysis and is supported by numerous software tools and libraries.

Raw data, derived data, and metadata are all medical imaging data types that can be stored in NIfTI files. They support various time periods and contrast modes and can store data from multiple modes. NIfTI files can also store additional data, such as image orientation and transformation matrices, due to their versatility and scalability.

The ANALYZE 7.5 file format was created by the Mayo Clinic in the 1990s and is the basis for the NIfTI file. In the early 2000s, with the introduction of the NIfTI format, the ANALYZE format was expanded and has become the recognized format for storing medical imaging data.

NIfTI is a widely used file format in the field of medical image analysis and is supported by many software tools and libraries. It is a flexible and scalable format, well-suited for storing various types of medical imaging data.