Journal of Veterinary Clinics (한국임상수의학회지)

The Korean Society of Veterinary Clinics (한국임상수의학회)
권호 표지
DOI QR코드

DOI QR Code

Correlation of Temporary Lateral Recumbency and Lung Opacity on Ventrodorsal Radiograph

일시적인 횡와 자세와 흉와위 영상에서 폐 불투과도의 상관관계

  • Lee, Hyunjik (College of Veterinary Medicine, Chungbuk National University) ;
  • Jeong, Jiyoon (College of Veterinary Medicine, Chungbuk National University) ;
  • Choi, Wooshin (College of Veterinary Medicine, Chungbuk National University) ;
  • Lee, Donghoon (College of Veterinary Medicine, Chungbuk National University) ;
  • Lee, Youngjae (College of Veterinary Medicine, Chungbuk National University) ;
  • Chang, Jinhwa (College of Veterinary Medicine, Chungbuk National University) ;
  • Chang, Dongwoo (College of Veterinary Medicine, Chungbuk National University)
  • Accepted : 2015.05.18
  • Published : 2015.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

The lung opacity on radiography is influenced by various factors. The physical density of the lung and the attenuation ensured on computed tomography (CT) scans is determined by three components : lung tissue, blood, and air. Temporary right lateral recumbency may responsible for the increase of opacity on ventrodorsal projection view. Thus, our aim is to demonstrate that the effect of right lateral recumbency posture on right lung opacity using radiograph and CT scan. In this study, 62 dogs without clinical or radiologic signs of cardiopulmonary disease are selected. Thorax radiographs per 30 seconds for 2 minutes (30s, 60s, 90s, 120s) were performed for 62 dogs. After discussion of the radiographic findings of lung field by two radiologists and a student at Chungbuk national university veterinary medical center a consensus opinion was recorded. Computed tomography per a minute (1 min, 2 min) for 2 minutes were performed for 2 dogs. Mean x-ray attenuation of lung was measured quantitatively using software at two levels (aortic arch and basal level). Among 62 dogs with radiograph comparison, 9.3% of dogs showed influence by postural effect. However, all 2 dogs with computed tomography comparison, showed influence by postural effect. In conclusion, position dependent changes of lung density in CT exam are not consistent with thoracic radiograph.

Keywords

References

  1. Andrew B. Prather, Clifford R. Berry, Donal E. Thrall. Use of radiography in combination with computed tomography for the assessment of noncardiac thoracic disease in the dog and cat. Vet Radiol Ultrasound 2005; 46: 114-121. https://doi.org/10.1111/j.1740-8261.2005.00023.x
  2. Brown RH, Scichilone N, Mudge B, Diemer FB, Permutt S, Toquias A. High-resolution computed tomographic evaluation of airway distensibility and the effects of lung inflation on airway caliber in healthy subjects and individuals with asthma. Am J Respir Crit Care Med. 2001; 163: 994-1001. https://doi.org/10.1164/ajrccm.163.4.2007119
  3. Chales M. Wiener, William J. Mckenna, Melvin J. Myers, J. P. Lavender, and J. M. B. Hughes. Left lower lobe ventilation is reduced in patients with cardiomegaly in the supine but not the prone position. Am Rev Respir Dis 1990; 141: 150-155. https://doi.org/10.1164/ajrccm/141.1.150
  4. Crispin P. Spencer, DVM, Norman Ackerman, DVM and James K. Burt, DVM. The canine lateral thoracic radiograph. Vet Radiol 1981; 22: 262-266. https://doi.org/10.1111/j.1740-8261.1981.tb01384.x
  5. David M, Karmrodt J, Bletz C, David S, Herweling A, Hans-Ulrich and Markstaller K. Analysis of atelectasis, ventilated, and hyperinflated lung during mechanical ventilation by dynamic CT. Chest 2005; 128: 3757-3770. https://doi.org/10.1378/chest.128.5.3757
  6. Galvin, G. B. Drummond and M. Nirmalan. Distribution of blood flow and ventilation in the lung: gravity is not the only factor. Br J Anaesth 2007; 98: 420-428. https://doi.org/10.1093/bja/aem036
  7. Gamsu G, Kaufman L, Swann SJ, Brito AC, Absolute lung density in experimental canine pulmonary edema. Invest Radiol 1979; 14: 261-269. https://doi.org/10.1097/00004424-197907000-00001
  8. Ho-Jung Choi, Ki-Ja Lee, Soo-Young Choi, Jung-Woo Lee, Woo-Sok Han, In Lee, Young-Hang Kwon and Young-Won Lee. Evaluation of Total Lung Volume and Density using Multi-Detector Computed Tomography in Normal Dogs. J Vet Clin 2011; 28: 510-515.
  9. Hyun Ju Lee, Jung-Gi Im, Jin Mo Goo, Young il Kim, Min Woo Lee, Ho-Geol Ryu, Jae-Hyuon Bahk, Chul-Gyu Yoo. Acute lung injury: Effects of prone positioning on cephalocaudal distribution of lung inflation-CT assessment in dogs. Radiology 2005; 234: 151-161. https://doi.org/10.1148/radiol.2341030992
  10. Merryn H. Tawhai, Martyn P. Nash, Ching-Long Lin and Eric A. Hoffman. Supine and prone differences in regional lung density and pleural pressure gradients in the human lung with constant shape. J Appl Physiol 2009; 107: 912-920. https://doi.org/10.1152/japplphysiol.00324.2009
  11. Nils-Erik Ahlberg, Fredrik Hoppe, and Leif svensson. A computed tomographic study of volume and x-ray attenuation of the lungs of beagles in various body positions. Vet Radiol 1985; 26: 43-47. https://doi.org/10.1111/j.1740-8261.1985.tb01115.x
  12. Per Wollmer, Kerstin Brauer, Leif Eriksson, Bjorn Jonson and Ulf Tylen. Measurement of pulmonary density by means of X-ray computerized tomography. Chest. 1986; 90: 387-391. https://doi.org/10.1378/chest.90.3.387
  13. Robinson PJ, Kreel L. Pulmonary tissue attenuation with computed tomography: comparison of inspiration and expiration scans. J Comput Assist Tomogr 1979; 3: 740-748. https://doi.org/10.1097/00004728-197903060-00006
  14. Rosenblum LJ, Mauceri RA, Wellenstein DE, Thomas FD, Bassano DA, Raasch BN, et al. Density patterns in the normal lung as determined by computed tomography. Radiology 1980; 137: 409-416. https://doi.org/10.1148/radiology.137.2.7433674
  15. Sven Nyren, Margareta Mure, Hans Jacobsson, Stig A. Larsson and Sten G. E. Lindahl. Pulmonary perfusion is more uniform in the prone than in the supine position: scintigraphy in healthy humans. J Appl Physiol 1999; 86: 1135-1141. https://doi.org/10.1152/jappl.1999.86.4.1135
  16. Tae-hun Kim, Jin-hwa Chang, Seok-ju Yun, Jung-hee Yoon and Dong-woo Chang. Assessment of computed tomographic lung density in beagle and shihtzu dogs : influence of position and positive end expiratory pressure. J Vet Clin 2010; 27: 273-283.
  17. Verschakelen, J. A., L. V. Fraeyehoven, G. Laureys, M. Demedts, A. L. Basert. Differences in CT density between dependent and nondependent portions of the lung : Influence of lung volume. AJR Am J Roentgenol 1993; 161: 713-717. https://doi.org/10.2214/ajr.161.4.8372744
  18. Wegener OH, Koeppe P, Oeser H. Measurement of lung density by computed tomography. J Comput Assist Tomogr 1978; 2: 263-273. https://doi.org/10.1097/00004728-197807000-00003