Background The aims of this study were to retrospectively assess the change in findings on followup CT scans of patients with non-specific interstitial pneumonia (NSIP; median, 72 months; range, 3e216 months) and to clarify the correlation between the baseline CT findings and mortality. Methods The study included 50 patients with a histologic diagnosis of NSIP. Two observers evaluated the highresolution CT (HRCT) findings independently and classified each case into one of the following three categories: (1) compatible with NSIP, (2) compatible with UIP or (3) suggestive of alternative diagnosis. The correlation between the HRCT findings and mortality was evaluated using the KaplaneMeier method and the log-rank test, as well as Cox proportional hazards regression models.

Alternate blade cavitation, rotating cavitation and cavitation surge in rocket turbopump inducers were simulated by a three dimensional commercial CFD code. In order to clarify the cause of cavitation instabilities, the velocity disturbance caused by cavitation was obtained by subtracting the velocity vector under non-cavitating condition from that under cavitating condition. It was found that there exists a disturbance flow towards the trailing edge of the tip cavity. This flow has an axial flow component towards downstream which reduces the incidence angle to the next blade. It was found that all of the cavitation instabilities start to occur when this flow starts to interact with the leading edge of the next blade. The existence of the disturbance flow was validated by experiments.

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