There are two imaging options for nasopharyngeal DWI, one is EPI self-selected echo sequence, and the other is fast spin echo sequence. The two sequences are completely different in the way of reading signals, and each has its own advantages and disadvantages. Traditional EPI imaging has high distortion, and its advantages are fast scanning speed, while TSE sequence has small deformation, but it takes a long time. It takes nearly 4 minutes to scan a complete nasopharynx. In view of the long scanning time and distortion, we put forward two questions. The first question is how to shorten the imaging time while ensuring the image quality; the second question is what is the optimal compression factor for nasopharynx?
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