Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Quantitative CT applications: comparison of current scanners.

C E Cann

    Radiology
    |January 1, 1987
    PubMed
    Summary

    Quantitative computed tomography (QCT) shows variable accuracy across different CT scanner models. Results are not always comparable between machines, necessitating correction factors for reliable quantitative computed tomography (QCT) measurements.

    Related Concept Videos

    You might also read

    Related Articles

    Articles linked to this work by shared authors, journal, and citation graph.

    Sort by
    Same author

    Quantitative computed tomography of vertebral spongiosa: a sensitive method for detecting early bone loss after oophorectomy. 1982.

    Clinical orthopaedics and related research·2000
    Same author

    Bone densitometry as an adjunct to GnRH agonist therapy.

    The Journal of reproductive medicine·1998
    Same author

    A longitudinal study of calcium homeostasis during human pregnancy and lactation and after resumption of menses.

    The American journal of clinical nutrition·1998
    Same author

    Skeletal development in newborn and weanling northern elephant seals.

    The American journal of physiology·1994
    Same author

    Oral bone imaging: the role of newer techniques.

    Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research·1993
    Same author

    Comparison of xenon-enhanced CT with ultrafast CT for measurement of regional cerebral blood flow.

    AJNR. American journal of neuroradiology·1993

    Area of Science:

    • Medical Imaging
    • Radiology
    • Quantitative Imaging

    Background:

    • Quantitative computed tomography (QCT) is utilized for measuring densities in lung nodules, bone, and kidney stones, as well as tumor volumes.
    • Commercial CT scanners exhibit variability in accurately and reproducibly quantifying high-atomic-number (high-Z) and low-Z materials.

    Purpose of the Study:

    • To compare the quantitative computed tomography (QCT) capabilities of sixteen CT scanner models from eight manufacturers.
    • To assess the accuracy and reproducibility of QCT measurements across different scanner models.

    Main Methods:

    • Field uniformity was evaluated using phantoms simulating the human torso.
    • CT numbers for high-Z materials and water were measured from the center to a radial distance of 13 cm.
    • Accuracy of computed radiographic localizer systems was assessed with and without gantry angulation.

    Main Results:

    • Differences in CT numbers from the center to 13 cm ranged from 1-50 HU for high-Z materials (mean 15 HU) and 0-15 HU for water.
    • Computed radiographic localizer accuracy varied from +/- 0.5 to +/- 2.0 mm (no angulation) and up to +/- 4 mm (angled gantry).
    • Various artifacts were observed to reduce QCT accuracy and reproducibility.

    Conclusions:

    • Not all CT scanners are equally suitable for quantitative computed tomography (QCT).
    • QCT results obtained on one machine may not be directly comparable to those from another.
    • Correction factors are necessary to ensure comparability of QCT results across different CT scanner models.

    Related Experiment Videos