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. Author manuscript; available in PMC: 2010 Jun 7.
Published in final edited form as: Radiology. 2008 Jan;246(1):229–240. doi: 10.1148/radiol.2461070053

Figure 7.

Figure 7

Graph shows mean failure rates and 95% confidence intervals (error bars) of the conventional phase-unwrapping (white bars) and APU (black bars) techniques for a range of threshold of maximum phase gradient T(PGmax) values. Two-way analysis of variance was used to detect differences between the two techniques. Threshold of maximum phase gradient and technique served as the two factors. The APU technique had lower failure rates than did the conventional phase-unwrapping technique (P < .001). We compared the lowest failure rates of the two techniques and found that APU enabled reduction of the failure rate from 18.9% to 0.60% (P < .001).