Journal of Veterinary Clinics (한국임상수의학회지)

The Korean Society of Veterinary Clinics (한국임상수의학회)
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Assessment of Abdominal Organs Movement by Respiration Using Computed Tomography in Dogs: A Pitfall for Radiation Therapy

  • Ah Reum Kim (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University) ;
  • Soyon An (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University) ;
  • Gunha Hwang (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University) ;
  • Moonyeong Choi (S Animal Cancer Center) ;
  • Tae Sung Hwang (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University) ;
  • Hee Chun Lee (Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University)
  • Received : 2023.01.27
  • Accepted : 2023.03.20
  • Published : 2023.04.30
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Abstract

The change in the position of the abdominal organs due to movement by respiration is one of the reasons behind inaccurate irradiation of organs during radiotherapy (RT). Although studies in human medicine have revealed on the respiratory movements of abdominal organs, there is little information and no reference data for dogs. The purpose of this study was to establish the reference values of abdominal organs movement in various postures using computed tomography (CT), and to compare the movements of organs between dorsal recumbency and ventral, right and left lateral recumbency during respiration. CT images for kidney, adrenal gland, medial iliac lymph node, urinary bladder, gallbladder, liver, stomach, and thoracic and lumbar vertebral body of five beagle dogs were acquired. The movements of organs were evaluated by comparing the end-expiratory and end-inspiratory images. Movements of the organs were evaluated by dividing it into right-to-left, dorsal-to-ventral, and cranial-to-caudal directions. The movements of abdominal organs according to the change in postures and respiration were establish. The movement of the bilateral organs was the least when the organs were in the downward position (p < 0.017). The movement of cranial-to-caudal direction was greater than the movement of the other directions in most of the organs. Data obtained in this study may be useful in selecting the appropriate posture that can reduce the movements of organs to be treated with RT, and the data could be useful for setting the planning target volume to consider the movements of the abdominal organs by respiration.

Keywords

Acknowledgement

This work was supported by the Animal Medical Institute of Gyeongsang National University and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2020R1G1A1007886).

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