Phase contrast magnetic resonance imaging (PC-MRI) is a specific type of magnetic resonance imaging used primarily to determine flow velocities. PC-MRI can be considered a method of Magnetic Resonance Velocimetry. Since modern PC-MRI is typically time-resolved, it can also be referred to as 4D imaging (three spatial dimensions plus time).
PC-MRI is not only used to determine flow velocities.
It is neither definitely correct nor definitely incorrect as the paragraph states that PC-MRI is primarily used to determine flow velocities. So in this context PC-MRI can be used for other things too hence the system found it difficult to differentiate.