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mmuckley avatar mmuckley commented on May 18, 2024

Hello @bigponglee, this is entirely expected. By using the NUFFT you are applying a coordinate transformation to an integral without using the Jacobian to normalize the new unit of integration. There are methods such as density compensation to partially, but not completely compensate for the effect.

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wenqihuang avatar wenqihuang commented on May 18, 2024

Hi @mmuckley,
thanks for the explanation! I'm also encountering this problem and using an ugly operator normalization to imperfectly fix it. Would you share some papers you mentioned as density compensation? It would be very helpful! Many thanks!
Best,
Wenqi

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mmuckley avatar mmuckley commented on May 18, 2024

@wenqihuang several people use this paper as a reference: https://onlinelibrary.wiley.com/doi/abs/10.1002/(SICI)1522-2594(199901)41:1%3C179::AID-MRM25%3E3.0.CO;2-V

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mmuckley avatar mmuckley commented on May 18, 2024

Closing as this does not document a bug.

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