Objective To explore the value of peak strain index（PSI） of transrectal real-time tissue elastography（TRTE） in the diagnosis of prostate cancer.Methods The clinical data of 100 patients with suspected prostate cancer were analyzed retrospectively.All patients underwent TRTE examination to calculate PSI values.ROC curve was drawn to analyze the value of PSI to determine the nature of prostate lesions.Taking pathological results as the gold standard

the diagnostic efficacy of TRTE for prostate cancer was compared.Results Among 100 patients with suspected prostate cancer

84 patients with prostate cancer

PSI was 0.58-54.76

with an average of 27.56±18.93.16 patients with benign prostate lesions

PSI was 1.67-27.73

with an average of 12.69±10.71.The difference was statistically significant（t=3.042

P=0.003）.Taking pathological results as the gold standard

TRTE has a sensitivity of 94.05%

a specificity of 93.75%

and an accuracy rate of 94.00%.ROC curve analysis showed that with a PSI cutoff value of 9.62

the sensitivity to judge the nature of the lesion was 96.43%

the specificity was 85.69%

and the area under the curve was 0.874.Conclusion The TRTE peak strain index PSI has high accuracy in the diagnosis of prostate cancer

which can help to increase the positive detection rate and has good clinical application value.