Table 1 Comparison of quantitative results of ultrasound and PAI for OT.

From: Dual-modal photoacoustic and ultrasound imaging for early diagnosis of ovarian torsion and evaluation of long-term tissue hypoxia

Model/Time

PAI (sO₂)

Ultrasound Parameters

Comparison Conclusions

Short-term torsion (6 h)

Significant decline

CPD synchronized

PAI quantification more accurate

Long-term torsion (12 h)

Sustained significant

CPD decline but no concordance in PSV/RI

PAI sensitivity higher

Long-term torsion (24 h)

Sustained significant

CPD regression

PAI unique diagnostic value

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