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• DWI Papers •
Rectal cancer lymph node can be identified by diffusion-weighted MRI with multiple b values
LI Jian-ming  LIU Yun-xia  ZHANG Meng-chao  QU Yang-chun 

DOI:10.12015/issn.1674-8034.2016.02.003.


[Abstract] Objective: To prospectively assess the diagnostic performance of diffusion-weighted (DWI) magnetic resonance imaging(MRI) in the detection of rectal cancer metastasis lymph nodes by using multiple b values and T2 weighted Imaging.Materials and Methods: Review of 80 cases of endoscopic and postoperative pathology confirmed DWI images of rectal cancer patients of China-Japan Friendship Hospital Affiliated Jilin University; DWI multi b scan, b values was 0, 20, 30, 50, 600, 800, 1000 s/mm2; Through analysis of workstation software, based on b value generated table apparent diffusion coefficient apparent diffusion coefficient (ADC) diagram. According to pathological results, will be divided into group A/B(metastasis lymph nodes and the metastasis lymph node), retrospective measurement and analysis of different b values metastasis lymph node detection rate; Measuring the size of different lymph nodes, multiple b value of ADC figure that lymph node detection rate; Analysis of more than two sets of lymph node b value of ADC value, the measurement of lymph node metastasis of sensitivity, specificity, ROC curve drawing.Results: (1)With the increase of b value (0—1000 s/mm2), lymph node detection rate decline; Ratio that image lymph nodes signal-to-noise of DWI can increasing. (2)More than 8 mm diameter lymph nodes, b value of DWI image detection rate is consistent, be more no significant statistical difference. (3)The high field strength more b value, the difference of group A/B lymph node with ADC values was statistically significant. (4)The best cut-off point for diagnosis the nature of lymph node, ADC values is 0.98×10-3mm2/s has a moderate sensitivity, high specificity.Conclusion: Identification the nature of lymph node, high field strength b value of DWI imaging can be more effective with high specificity and medium sensitivity.
[Keywords] Rectal neoplasms；Lymph nodes；Magnetic resonance imaging；Diffusion weighted imaging

LI Jian-ming Department of Radiology, China-Japan Friendship Hospital Affiliated Jilin University, Changchun 130000, China

LIU Yun-xia* Department of Radiology, China-Japan Friendship Hospital Affiliated Jilin University, Changchun 130000, China

ZHANG Meng-chao Department of Radiology, China-Japan Friendship Hospital Affiliated Jilin University, Changchun 130000, China

QU Yang-chun Department of Radiology, China-Japan Friendship Hospital Affiliated Jilin University, Changchun 130000, China

*Correspondence to: Liu YX, E-mail: 854732649@qq.com

Conflicts of interest   None.

ACKNOWLEDGMENTS  This work was part of scientific research project of Health and Family Planning Commission of Jilin Province No. 2011I109
Received  2015-08-11
Accepted  2015-12-23
DOI: 10.12015/issn.1674-8034.2016.02.003
DOI:10.12015/issn.1674-8034.2016.02.003.

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