Magnetic resonance diffusion weighted imaging sequence shows the best b value of sacroiliac joint imaging of healthy volunteers

doi:10.3969/j.issn.2095-4344.2013.17.012

Abstract

Abstract:

BACKGROUND: Magnetic resonance diffusion weighted imaging sequence is one of the inspection methods which is simple to operation, has strong specificity and high sensitive and can early diagnose the active sacroiliitis and monitoring the activities, but there is no standard of b values of sacroiliac joint displayed with diffusion weighted imaging sequence.
OBJECTIVE: To find the best b value displayed with magnetic resonance diffusion weighted imaging sequence through comparing the difference of diffusion weighted imaging and apparent diffusion coefficient between the healthy volunteers aged 10-20 years old under different b values of sacroiliac joint.
METHODS: Twenty-one healthy volunteers without sacroiliac joint diseases, aged 10-20 years old were collected for research. All the health volunteers were taken MRI scan with several sequences (T1WI, STIR, DWI: b=300 s/mm², 600 s/mm², 900 s/mm²). The sacroiliac joint displayed under different b values was observed, and the images were evaluated. Meanwhile, the apparent diffusion coefficient of the sacral side and iliac side joint surrounding bone marrow of bilateral sacroiliac joint was measured, and the statistical analysis of apparent diffusion coefficient of sacroiliac joint surrounding bone marrow was performed under different b values.
RESULTS AND CONCLUSION: Clear images with high contrast ratio of 21 healthy volunteers (42 sacroiliac joints) could clearly show the sacroiliac joints when the b values were 300 s/mm²and 900 s/mm². When the b value was 900 s/mm², the images had larger image artifacts, fuzzy image quality and poor contrast ration that unable to complete the measurement of the apparent diffusion coefficient values. When the b value was 600 s/mm², the change of apparent diffusion coefficient of sacroiliac joint surrounding bone marrow was small, while the b value was 300 s/mm², the difference of apparent diffusion coefficient of sacroiliac joint was significant. The b value of 600 s/mm² is the best b value for magnetic resonance diffusion weighted imaging sequence to display the sacroiliac joint which can clearly show the bilateral sacroiliac joint, and the apparent diffusion coefficient of bilateral sacroiliac joint surrounding bone marrow measured with the b value has higher accuracy.

Key words: bone and joint implants, photographs and images of bone and joint, 10-20 years old, healthy volunteer, ankylosing spondylitis, sacroiliac joint, magnetic resonance imaging, diffusion weighted imaging, apparent diffusion coefficient, b value, comparative study, provincial grants-supported paper

CLC Number:

R318

Li Bei-bei, Ren Cui-ping, Li Ying, Shi Xiao-ying, Ren Xian. Magnetic resonance diffusion weighted imaging sequence shows the best b value of sacroiliac joint imaging of healthy volunteers[J]. Chinese Journal of Tissue Engineering Research, 2013, 17(17): 3124-3131.

Figures/Tables 3

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