Automatic bolus tracking in monophasic spiral CT of the liver: liver-to-lesion conspicuity.

Abstract:

:The aim of this study was to evaluate the value of automatic bolus tracking for monophasic spiral CT of the liver and to assess the liver-to-lesion conspicuity in comparison with time-delay examinations. In 40 patients scheduled for therapy control of known hypovascular hepatic metastases a monophasic spiral CT was completed either with time delay of 65 s (n = 20) or with automatic bolus tracking in the liver parenchyma (n = 20). Examinations were performed with 120 ml of contrast material and a flow rate of 3.0 ml/s. For automatic bolus tracking a parenchymal enhancement threshold of 40 HU was used. Contrast enhancement in the liver parenchyma and in liver lesions was obtained by means of regions of interest (ROI). Mean parenchymal enhancement was not significantly different between time delay and bolus-tracking group. In 4 of 20 patients in the bolus-tracking group the threshold level of 40 HU was not reached. With automatic bolus tracking a significantly higher liver-to-lesion density difference was observed (P < 0.0001). Automatic bolus tracking allows a better liver-to-lesion conspicuity in monophasic spiral CT. Contrary to recent studies, a significantly higher parenchymal enhancement was not found using automatic bolus tracking.

journal_name

Eur Radiol

journal_title

European radiology

authors

Mehnert F,Pereira PL,Trübenbach J,Kopp AF,Claussen CD

doi

10.1007/s003300000637

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

580-4

issue

4

eissn

0938-7994

issn

1432-1084

journal_volume

11

pub_type

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