Using Ultrasound Imaging system validity of cervical thymus cross-sectional area measurements in the evaluation of calf thymus growth

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  • OHBAN Hanon
    Graduate School of Animal and Veterinary Sciences and Agriculture, Obihiro University of Agriculture and Veterinary Medicine
  • ITOH Megumi
    Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine
  • WATANABE Kenichi
    Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine
  • TAKAHASHI Eiji
    Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine

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  • 子牛胸腺発育評価における超音波画像診断装置を用いた頸部胸腺断面積測定の有効性
  • コウシ キョウセン ハツイク ヒョウカ ニ オケル チョウオンパ ガゾウ シンダン ソウチ オ モチイタ ケイブ キョウセン ダンメンセキ ソクテイ ノ ユウコウセイ

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<p>The aim of this study was to establish an index for evaluating calf thymus gland development using an ultrasound imaging system. We used calves (n=25) within 2 months of age. The thymus score was determined by palpation and cervical thymus cross-sectional area was measured using an ultrasound imaging system. Estimated body weight was obtained using a weight estimation scale. The actual thymus weight was measured at pathological autopsy. Single regression analysis was used to analyze the relationship between thymic score, cervical thymic cross-sectional area, and estimated body weight and thymic weight, respectively. The rank correlation coefficients were 0.84, 0.91, and 0.07, respectively, with P values of <0.01, <0.01, and 0.73, respectively. Both the thymic score and cervical thymic cross-sectional area showed sig-nificant correlations with thymic weight, but cervical thymic cross-sectional area was more strongly correlated with thymic weight than thymic score. The cervical thymus cross-sectional area is a continuous variable presented as an objective numerical value. Measurement of the cervical thymus cross-sectional area using an ultrasound imaging system allows anyone to accurately assess the thymus size in calves.</p>

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