https://doi.org/10.5812/iranjradiol.4617

Automatic Bolus Tracking Versus Fixed Time-Delay Technique in Biphasic Multidetector Computed Tomography of the Abdomen

authors:

avatar Atoosa Adibi 1 , * , avatar Ali Shahbazi 1

Department of Radiology, Isfahan University of Medical Sciences, Isfahan, Iran
Iranian Journal of Radiology: Vol.11, issue 1; 4617
published online: January 29, 2014
article type: Research Article
received: April 2, 2012
accepted: October 12, 2012

how to cite: Adibi A, Shahbazi A. Automatic Bolus Tracking Versus Fixed Time-Delay Technique in Biphasic Multidetector Computed Tomography of the Abdomen. I J Radiol. 2014;11(1):4617. https://doi.org/10.5812/iranjradiol.4617.

Abstract

Background:

Bolus tracking can individualize time delay for the start of scans in spiral computed tomography (CT).

Objectives:

We compared automatic bolus tracking method with fixed time-delay technique in biphasic contrast enhancement during multidetector CT of abdomen.

Patients and Methods:

Adult patients referred for spiral CT of the abdomen were randomized into two groups; in group 1, the arterial and portal phases of spiral scans were started 25 s and 55 s after the start of contrast material administration; in group 2, using the automatic bolus tracking software, repetitive monitoring scans were performed within the lumen of the descending aorta as the region of interest with the threshold of starting the diagnostic scans as 60 HU. The contrast enhancement of the aorta, liver, and spleen were compared between the groups.

Results:

Forty-eight patients (23 male, 25 female, mean age=56.413.5 years) were included. The contrast enhancement of the aorta, liver, and spleen at the arterial phase was similar between the two groups (P > 0.05). Regarding the portal phase, the aorta and spleen were more enhanced in the bolus-tracking group (P<0.001). The bolus tracking provided more homogeneous contrast enhancement among different patients than the fixed time-delay technique in the liver at portal phase, but not at the arterial phase.

Conclusions:

The automatic bolus-tracking method, results in higher contrast enhancement of the aorta and spleen at the portal phase, but has no effect on liver enhancement. However, bolus tracking is associated with reduced variability for liver enhancement among different patients.

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