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Optimization of scan delay for multi-phase computed tomography using bolus-tracking technique in normal canine kidney
Hyun Cho1, DaHae Lee1, AhYoung Cha1, DongEun Kim1, DongWoo Chang2, Jihye Choi1,*
1College of Veterinary Medicine, Chonnam National University, 77, Youngbong-ro, Buk-gu, Gwangju 61186, South Korea
2College of Veterinary Medicine, Chungbuk National University, Chungdae-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do 28644, South Korea
Correspondence to: Tel: +82-62-530-2821; Fax: +82-62-530-2809; E-mail: imsono@chonnam.ac.kr
Received: April 5, 2017; Revised: August 4, 2017; Accepted: September 22, 2017; Published online: October 13, 2017.
This study was performed to optimize scan delays for the kidney using a bolus-tracking technique. In six beagle dogs, CT scan of the kidney were performed three times in each dog with different scan delays after bolus tracking triggered at 100 Hounsfield of aortic enhancement; 5, 20, 35, and 50 sec for the first scan, 10, 25, 40, and 55 sec for the second scan, and 15, 30, 45, and 60 sec for the third scan. The renal artery-to-vein contrast difference peaked at 5 sec and the renal cortex-to-medulla contrast difference reached a peak at 10 sec. The renal cortex-to-medulla contrast difference reaches almost zero at a scan delay of 30 sec after the trigger. For the injection protocol used in this study, the optimal scan delay times for renal arterial, corticomedullary, and nephrographic phases were 5 sec, 10 sec, and 30 sec after triggered at 100 HU of aortic enhancement using the bolus-tracking technique. Bolus tracking technique is useful for multi-phase renal CT study by compensating different transit times to the kidney between different animals with small dose of contrast media and no need for extra radiation exposure of the patient.
Keywords: computed tomography, bolus-tracking, kidney, dog, scan delay

© 2017 The Korean Society of Veterinary Science.