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Bolus Triggering ±â¹ýÀ» ÀÌ¿ëÇÑ µ¿¸Æ½Ã±â ³ª¼±½Ä CT : ÀÌÇà½Ã°£ÀÇ ÃÖÀûÈ­ Dual-Phase Helical CT Using Bolus Triggering Technique : Optimization of Transition Time

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1/2ÃÖ¿µÈ£/12Young Ho Choi 1/2±èÅ°æ/1/2¹Úº´°ü/1/2°í¿µÈ¯/1/2ÇÑÁر¸/1/2ÃÖº´ÀÎ/12Tae Kyoung Kim/12Byung Kwan Park/12Young Hwan Koh/12Joon Koo Han/12Byung Ihn Choi

Abstract

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#ÃÊ·Ï#
Purpose : To optimize the transition time between the triggering point in monitoring
scanning and the initiation of diagnositic hepatic carterial phase (HAP) scanning in
hepatic spiral CT, using a bolus triggering technique.
Materials and Methods : One hundred consecutive patients with focal hepatic lesion
were included in this study. Patients were randomized into two groups. Transition times
of 7 and 11 seconds were used in group 1 and 2, respectively. In all patients, bolus
triggered HAP spiral CT was obtained using a semi-automatic bolus tracking program
after the injection of 120§¢ of non-ionic contrast media at a rate of 3 §¢/sec. When
aortic enhancement reached 90 HU, diagnostic HAP scanning began after a given
trasition time. From images of group 2, the degree of parenchymal enhancement of the
liver and tumor-to-liver attenuation difference were measured. Also. for qualitative
analysis, conspicuity of the hepatic artery and hypervascular tumor was scored and
analyzed.
Results : Hepatic parenchymal enhancement on HAP was 12.07+/-6.44 HU in group 1
and 16.03+/-5.80 HU in group 2(p <.05). Hypervascular tumors were detected in seven
patients in group 1 and 13 patients in group 2. Tumor-to-liver contrast was
20.43+/-9.47 HU in group 1 and 28.77+/-12.75 HU in group 2(p <.05). In the evaluation
of conspicuity of hypervascular tumors in group 2 was higher than in group 1(p <.05).
Conclusion : HAP spiral CT using a bolus triggering technique with a transition time of
11 seconds provides better HAP images than when the transition time is 7 seconds.

Å°¿öµå

Liver CT; Computed tomography(CT) helical; Computed tomography (CT) contrast enhancement;

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