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  • Abdomen, helical CT  (1)
  • Key words: Computed tomography, contrast media—Computed tomography, tissue characterization—Liver, CT—Liver, diseases—Liver, fatty.  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Abdominal imaging 20 (1995), S. 209-210 
    ISSN: 1432-0509
    Keywords: Computed tomography, technique ; Liver volume, measurement ; Abdomen, helical CT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: Accurate noninvasive measurement of the volume of the liver has many potential clinical applications and is an important element in the preoperative evaluation of the liver transplant recipient. Helical (or spiral) computed tomography (CT) has theoretical advantages over conventional CT in this application because the entire liver can be imaged in a single breath-hold, limiting inaccuracies related to patient motion and respiratory variation. Methods: We compared liver volumes measured by conventional CT and helical CT in 22 patients undergoing preoperative evaluation for liver transplantation. Results: The mean volume for helical CT is 1328 ml (SD 405) and conventional CT is 1323 ml (SD 417). Conclusions: We found no significant difference between the helical CT and conventional CT volumes for each patient.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0509
    Keywords: Key words: Computed tomography, contrast media—Computed tomography, tissue characterization—Liver, CT—Liver, diseases—Liver, fatty.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Background: We investigated whether liver-minus-spleen (L-S) attenuation differences can accurately diagnose fatty infiltration of the liver on contrast-enhanced computed tomography (CT). Methods: A group of 78 patients administered a fast injection (90-s duration) of 150 mL 60% ionic contrast was compared with 81 patients given a slow injection (152.5 s). The presence or absence of fatty infiltration of the liver was diagnosed by noncontrast CT. Results: The L-S attenuation differences varied significantly, depending on both injection rate and timing of measurements. For the fast-injection group, the optimal L-S threshold for diagnosing fatty infiltration ranged from −43 to −33 Hounsfield units (HU) for early (79 s) and late measurements (106 s), respectively. For the slow-injection group, the optimal threshold ranged from −31 to −25 HU (80 and 112 s, respectively). In addition, sensitivity was not very high (range = 0.54–0.71) for either injection protocol at any measurement time because of significant overlap of L-S values between normal and fatty infiltration patients. Moderate and severe fatty infiltration were more reliably diagnosed than mild fatty infiltration by this method. Conclusions: Contrast injection rate and timing of measurements significantly influence the optimal L-S threshold for diagnosing fatty liver. This limits the clinical usefulness of such measurements.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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