Optimal scan delay depending on contrast material injection duration in abdominal multi-phase computed tomography of pancreas and liver in normal Beagle dogs.
This study was conducted to establish the values for optimal fixed scan delays and diagnostic scan delays associated with the bolus-tracking technique using various contrast material injection durations in canine abdominal multi-phase computed tomography (CT). This study consisted of two experiments employing the crossover method. In experiment 1, three dynamic scans at the porta hepatis were performed using 5, 10 and 15 sec injection durations. In experiment 2, two CT scans consisting of five multi-phase series with different scan delays of 5 sec intervals for bolus-tracking were performed using 5, 10 and 15 sec injection duration. Mean arrival times to aortic enhancement peak (12.0, 15.6, and 18.6 sec for 5, 10, and 15 sec, respectively) and pancreatic parenchymal peak (17.8, 25.1, and 29.5 sec) differed among injection durations. The maximum mean attenuation values of aortas and pancreases were shown at the scan section with 0 and 5, 0 and 10 and 5 and 10 sec diagnostic scan delays during each injection duration, respectively. The optimal scan delays of the arterial and pancreatic parenchymal phase in multi-phase CT scan using fixed scan delay or bolus-tracking should be determined with consideration of the injection duration.
Ian Animal Diagnostic Center, Seoul 06014, Korea.
Soo-Young
SY
Choi
Ian Animal Diagnostic Center, Seoul 06014, Korea.
In
I
Lee
College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea.
Ji-Won
JW
Seo
College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea.
Hyun-Young
HY
Park
College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea.
Ho-Jung
HJ
Choi
College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea.
Young-Won
YW
Lee
D000818:Animals; D003287:Contrast Media / Q000737:chemistry*; D004285:Dogs; D005260:Female; D007275:Injections, Intravenous / Q000662:veterinary; D007472:Iohexol / Q000737:chemistry*; D008099:Liver / Q000000981:diagnostic imaging*; D008297:Male; D010179:Pancreas / Q000000981:diagnostic imaging*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000662:veterinary*
D003287:Contrast Media; D007472:Iohexol
bolus-tracking technique; computed tomography; dogs; injection duration; scan delay