Poor reconstruction effect in Ultrasound freehand calibration

When we perform ultrasound calibration, the reconstructed effect of the scanned model is poor. Could you explain why this is the case? The following image shows the scanned model and the reconstructed effect.

It’s hard to help with so few details. Do you think the calibration is not good enough? 3D renderings of compounded ultrasound volumes will typically also look cluttered by default.