Optimising the scan delay for arterial phase imaging of the liver using the bolus tracking technique.

Chan, R.; Kumar, G.; Abdullah, B.; Ng, K.H.; Vijayananthan, A.; Mohd Nor, H.; Liew, Y. (2011) Optimising the scan delay for arterial phase imaging of the liver using the bolus tracking technique. Biomedical Imaging and Intervention Journal (biij), 7 (2).

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    Abstract

    OBJECTIVE: To optimize the delay time before the initiation of arterial phase scan in the detection of focal liver lesions in contrast enhanced 5 phase liver CT using the bolus tracking technique. PATIENTS AND METHODS: Delay - the interval between threshold enhancement of 100 hounsfield unit (HU) in the abdominal aorta and commencement of the first arterial phase scan. Using a 16 slice CT scanner, a plain CT of the liver was done followed by an intravenous bolus of 120 ml nonionic iodinated contrast media (370 mg I/ml) at the rate of 4 mL/s. The second phase scan started immediately after the first phase scan. The portal venous and delay phases were obtained at a fixed delay of 60 s and 90 s from the beginning of contrast injection. Contrast enhancement index (CEI) and subjective visual conspicuity scores for each lesion were compared among the three groups. RESULTS: 84 lesions (11 hepatocellular carcinomas, 17 hemangiomas, 39 other hypervascular lesions and 45 cysts) were evaluated. CEI for hepatocellular carcinomas appears to be higher during the first arterial phase in the 6 seconds delay group. No significant difference in CEI and mean conspicuity scores among the three groups for hemangioma, other hypervascular lesions and cysts. CONCLUSION: The conspicuity of hepatocellular carcinomas appeared better during the early arterial phase using a bolus tracking technique with a scan delay of 6 seconds from the 100 HU threshold in the abdominal aorta.

    Item Type: Article
    Creators:
    1. Chan, R.
    2. Kumar, G.
    3. Abdullah, B.
    4. Ng, K.H.
    5. Vijayananthan, A.
    6. Mohd Nor, H.
    7. Liew, Y.
    Journal or Publication Title: Biomedical Imaging and Intervention Journal (biij)
    Additional Information: Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia ----> Corresponding author. Address: Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia. E-mail: ruohshyuan@gmail.com (Ruoh Shyuan Chan).
    Uncontrolled Keywords: Arterial phase imaging of the liver, Bolus tracking technique
    Subjects: R Medicine
    Divisions: Faculty of Medicine
    Depositing User: Mr. Faizal Hamzah
    Date Deposited: 03 Jul 2012 10:21
    Last Modified: 03 Jul 2012 10:21
    URI: http://eprints.um.edu.my/id/eprint/3457

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