Departmental Bulletin Paper Effects of scatter correction processing on image quality of portable thoracic radiography in calves

Shimbo, Genya  ,  Tagawa, Michihito  ,  Matsumoto, Kotaro  ,  Tomihari, Mizuki  ,  Miyahara, Kazuro

66 ( 2 )  , pp.105 - 112 , 2018-05 , Faculty of Veterinary Medicine, Hokkaido University
Thoracic radiography provides diagnostic assistance in assessing the severity of lung lesions in bovine respiratory diseases. We investigated the effects of a novel scatter correction processing software on the image quality of portable thoracic radiography in calves: this scatter correction method was recently developed for mobile bedside chest radiography in humans. Thoracic radiographs of the caudodorsal region were obtained from 30 calves of various sizes. Scatter correction processing of a grid ratio of 3 : 1 or 8 : 1 was applied to each image. The delineation of caudal thoracic vertebral bodies, scapulae, proximal third of the ribs, pulmonary vessels, and the aortic arch, as well as overall image quality were graded by five veterinarians using 5-point scales. Three types of images (original and scatter-corrected with grid ratios of 3 : 1 and 8 : 1) were compared using visual grading characteristics analysis. Scatter correction with a grid ratio of 3 : 1 improved the overall image quality, at least for calves with a body thickness of ≤40 cm, and improved the delineation of some anatomical structures for larger calves. Scatter correction with a grid ratio of 8 : 1 did not improve the delineation of any anatomical structures examined for calves >40 cm in thickness or the overall image quality for calves >30 cm in thickness. The present findings support the efficacy of scatter correction processing with a grid ratio of 3 : 1 for portable thoracic radiography in calves.

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