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Application and sequence optimization of MRI subtraction in showing trigeminal nerve and blood vessels
LIAO Zhen-hong  LIU Gao-yuan  ZOU Lin-bo  WANG Zhou-xuan 

DOI:10.12015/issn.1674-8034.2017.08.011.


[Abstract] Objective: To explore the application and sequence optimization of MR silhouette in the display of relation between trigeminal nerve of intracisternal segment and surrounding blood vessels.Materials and Methods: From January 2015 to July 2016, 84 patients with suspected trigeminal neuralgia from people’s hospital of Deyang city were treated with 3T MRI for 3D-TOF-MRA, 3D-B-FFE and CE-MRA. And then silhouette: the image of CE-MRA minus that of 3D-B-FFE multiplied by the 100%, 40%, 10% coefficient (silhouette method) to obtain the images of group A, B, C after silhouetting, and 3D-TOF-MRA minus 3D-B-FFE multiplied by the image of 40% coefficient to obtain the image of group D. Calculation was done to obtain the singal to noise ratio (SNR) of trigeminal nerve, contrast to noise ratio (CNR) and singal intensity ratio (SIR) of arteries and veins versus trigeminal nerve in the images of group A, B, C and D. The 3D-TOF-MRA combined with 3D-B-FFE and group B of silhouette method were analyzed and compared to determine the affected nerve’s contacting with blood vessels.Results: Groups A, B, C were compared, where SNR of trigeminal nerve, CNR of arteries and veins versus trigeminal nerve, and SIR of veins versus trigeminal nerve all had statistical significance (P<0.05), and SIR of arteries and trigeminal nerve had no statistical significance (P>0.05). Groups B, D were compared, where SNR of trigeminal nerve, and CNR and SIR of arteries versus trigeminal nerve had no statistical significance (P>0.05), while CNR and SIR of veins versus trigeminal nerve had statistical significance (P<0.05). In determining the relation between blood vessel and nerve by 3D-TOF-MRA combined with 3D-B-FFE and group B of silhouette method, there was no significant difference in the positive rate of two methods (P>0.05). In the patients diagnosed as positive by both two methods, compressional deformation rate of group B image was greater than that of 3D-TOF-MRA combined with 3D-B-FFE (P<0.05).Conclusion: Silhouette of CE-MRA and 3D-B-FFE multiplied by 40% coefficients make the cerebrospinal fluid low signal, the nerve equal signal, and arteriovenous vessel high signal, which has a strong ability to display the space relation between trigeminal nerve of intracisternal segment and surrounding blood vessel.
[Keywords] Magnetic resonance subtraction；Trigeminal neuralgia；Magnetic resonance angiography；Magnetic resonance imaging

LIAO Zhen-hong* People’s Hospital of Deyang City, Deyang 618000, China

LIU Gao-yuan People’s Hospital of Deyang City, Deyang 618000, China

ZOU Lin-bo People’s Hospital of Deyang City, Deyang 618000, China

WANG Zhou-xuan People’s Hospital of Deyang City, Deyang 618000, China

*Correspondence to: Liao ZH, E-mail: lzh20040506@163.com

Conflicts of interest   None.

Received  2017-04-18
Accepted  2017-06-12
DOI: 10.12015/issn.1674-8034.2017.08.011
DOI:10.12015/issn.1674-8034.2017.08.011.

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