The optimal cut-off fat-lesion ratio between benign and malignant breast masses using Canon devices

Abstract

Purpose: There is already a consensus on the usefulness of elastography in breast ultrasonography. However, it is known that the cut-off strain ratio (SR: FLR) differs depending on the manufacturer. There have been few reports on the optimal cut-off FLR in Strain Imaging on Canon equipment, and no data have been presented in Japan. The purpose of this study was to determine the optimal cut-off value between benign breast masses and invasive carcinoma on a Canon device. Subjects & Methods: The subjects were patients who underwent breast ultrasound and FLR measurement with an Aplio i800 between October 1, 2018 and March 31, 2019. Sixty cases showed benign masses, and 70 cases showed invasive cancer. The charts were reviewed and the FLR values were checked retrospectively, and the appropriate cut-off value was examined using the Youden index. Results & Discussion: The optimal cut-off FLR was 4.38.It has been pointed out that the cut-off SR may be different due to differences in ultrasound equipment and examination technique in the JABTS guideline. The value for the Hitachi device was reported to be 4.8, and we previously reported a value of about 3 for the GE device. It is important to be aware that the values vary depending on the device used. Conclusion: The optimal cut-off FLR in elastography is about 4.38 for Canon’s system.