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Related Experiment Videos

Effect of intersection spacing on MR image contrast and study time.

J B Kneeland, A Shimakawa, F W Wehrli

    Radiology
    |March 1, 1986
    PubMed
    Summary

    Section separation in magnetic resonance imaging (MRI) affects image contrast and T1 relaxation times. This study explains these effects and explores methods to mitigate them for better image quality.

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    Construction and calibration of a 50 T/m z-gradient coil for quantitative diffusion microimaging.

    Journal of magnetic resonance (San Diego, Calif. : 1997)·2007

    Area of Science:

    • Medical Imaging
    • Biophysics

    Background:

    • Magnetic Resonance Imaging (MRI) is crucial for non-invasive anatomical and physiological assessment.
    • Accurate T1 relaxation time measurements are vital for quantitative MRI analyses.
    • Section selection imperfections can introduce artifacts affecting image quality and quantitative accuracy.

    Purpose of the Study:

    • To investigate the impact of section separation on image contrast and T1 relaxation times in MRI.
    • To provide a qualitative explanation for observed effects based on excitation side lobes.
    • To evaluate strategies for improving section selection, such as section gap and non-sequential excitation.

    Main Methods:

    • Experiments were conducted on healthy volunteers and a phantom.
    • An early commercial MRI system was utilized.
    • Qualitative analysis focused on the effects of excitation side lobes outside the selected imaging section.

    Main Results:

    • Section separation was found to reduce available T1 relaxation time.
    • This reduction impacts image contrast and quantitative T1 measurements.
    • Excitation side lobes were identified as the primary cause of these effects.

    Conclusions:

    • Section separation in MRI can lead to reduced T1 relaxation time and altered image contrast.
    • Understanding these effects is crucial for optimizing MRI acquisition parameters.
    • Strategies like section gap and non-sequential excitation offer trade-offs for managing imperfect section selection.

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