ObjectiveTo explore the value of high frequency linear transabdominal probe in ultrasound imaging of fetal heart at 11-13⁺⁶ weeks of gestation.MethodsFive hundred and seventy women with singleton pregnancies at 11-13⁺⁶ weeks of gestation receiving ultrasonic examinations in the Obstetrics and Gynecology Hospital of Tongji University from March 2024 to May 2024 were enrolled. The fetal hearts were examined using high frequency linear transabdominal probe and convex transabdominal probe, and the images were stored.ResultsThe image display rates and high quality rates with transabdominal high frequency linear probe were higher than those with transabdominal convex probe (both P<0.05). The larger the gestational age, the higher the display rate of the basic cardiac views of the fetus. At 13-13⁺⁶ weeks of gestation, the display rate of the four-chamber view of the fetus with the two probes was both 100% (P>0.05). At 11-11⁺⁶ weeks and 12-12⁺⁶ weeks of gestation, the display rates of the four-chamber heart view of the fetus with transabdominal high frequency linear probe were both higher than those with transabdominal convex probe (both P<0.05). The differences were statistically significant (P<0.05). At 11-11⁺⁶ weeks, 12-12⁺⁶ weeks and 13-13⁺⁶ weeks of gestation, the display rates of left ventricular outflow tract view, three-vessel view and right ventricular outflow tract view with transabdominal high-frequency linear array probe were all higher than those with transabdominal convex probe, and the differences were statistically significant (all P<0.05).ConclusionThe high frequency linear transabdominal probe has advantages in ultrasound imaging of fetal heart at first trimester, it can provide important basis for early diagnosis of congenital heart disease.