In-phase (IP) and out-of-phase (OOF) sequences correspond to paired MRI gradient echo (GRE) sequences obtained with the same repetition time (TR) but with two different echo time (TE) values.
Applications
The main application of the IP-OOP sequences is to identify a pathological fat content of tissues in the abdomen by showing signal intensities drop on the OOP images compared to the IP images. Examples where IP-OOP sequences are useful include:
- fatty liver
- adrenal adenoma (helping differentiate it from carcinomas and metastases)
- renal cell carcinoma (RCC)
Reference
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