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Thickness measurement of femoral head cartilage in hip joint in MRI

2013-09-19
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Thickness measurement method of femoral head cartilage of hip joint in MRI: In order to realize the automatic detection of hip joint cartilage thickness in nuclear magnetic resonance imaging, this paper proposes an automatic measurement method based on zero crossing points combined with Gaussian filtering. The thickness distribution of femoral head cartilage of human hip joint is simulated, and a mathematical model of a two-dimensional thin surface is established. The point spread function model simulating the MR image photography process is introduced, which can simulate the intensity waveform of the MR simulation signal along the normal direction of the thin surface. The zero crossing method based on the second-order differential of Gauss can be used to accurately measure the thickness of the thin surface. The thickness of the thin surface is defined as the distance between the two zero crossing points of the second-order differential of Gauss along the normal direction of the thin surface. The thin surface model simulation and physical specimen experiments have verified the effectiveness of this method. Keywords Cartilage; Mathematical model; Nuclear magnetic resonance imaging; Point spread function; Thickness measurement

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