A Comparative Study of Fetal Head Diameter Measured by Radiography and Ultrasonography in Dogs and Cats
World Small Animal Veterinary Association Congress Proceedings, 2018
C. Limmanont1,2; S. Ponglowhapan3; T. Sirinarumitr2,4; K. Sirinarumitr2,5
1Graduate school, Faculty of Veterinary Medicine, Kasetsart University, Bangkok, Thailand; 2Center for Advanced Studies in Agriculture and Food, KU Institute for Advanced Studies, Kasetsart University, Bangkok, Thailand; 3Department of Obstetrics Gynaecology and Reproduction, Faculty of Veterinary Medicine, Chulalongkorn University, Bangkok, Thailand; 4Department of Pathology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok, Thailand; 5Department of Companion Animal Clinical Science- Faculty of Veterinary Medicine, Kasetsart University, Bangkok, Thailand


Radiography and ultrasonography are both widespread methods used in veterinary obstetrics. In a ventrodorsal radiographic view, measurements of fetal biparietal or head diameter (HD) and maternal pelvic diameter are commonly used to predict the risk of dystocia in dogs and cats due to relatively oversized fetus. However, HD measurement is easier to perform with ultrasound scan.


To compare and find the correlations of fetal HD measured by radiography and ultrasonography in dogs and cats.


Twenty-seven dogs and seventeen cats were diagnosed in last trimester of pregnancy at Kasetsart University Veterinary Teaching Hospital during 2017–2018. Fetal HD was measured by radiography and transabdominal ultrasonography on the same day. The correlations between the two techniques and linear regressions of HD were statistically analyzed.


Radiographic measurements of fetal HD were larger than those measured by ultrasonography in both dogs (p<0.0001) and cats (p<0.0001). The correlations were significant (r=0.85 in dogs and r=0.94 in cats, p<0.0001). Linear regression formulas were y=1.0716x+0.1661 (R2=0.72) in dogs, and y=0.9627x+0.3148 (R2=0.88) in cats (y=HD by radiography, x=HD by ultrasonography).


Fetal HD measurements were different between two modalities. The formulas above can be implied to estimate relatively oversized fetus.


Speaker Information
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C. Limmanont
Graduate School, Faculty of Veterinary Medicine
Kasetsart University
Bangkok, Thailand

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