[Comparison between Gd-DTPA-enhanced MRI and USPIO-enhanced MRI in diagnosing benign and metastatic cervical lymph
Yan Feng1, Gui-xiang Zhang, Han Wang
1Department of Radiology, The First Affiliated Hospital, Shanghai Jiaotong University, Shanghai 200080, China.
Objective:
To compare the diagnostic value of gadolinium diethylenetriaminepenta-acetic acid (Gd-DTPA)-enhanced MRI with ultrasmall superparamagnetic iron oxide (USPIO)-enhanced MRI in differentiating reactive hyperplastic lymph nodes from metastatic lymph nodes in rabbit models.
Methods:
Reactive hyperplastic cervical lymph node model was established in 18 rabbits as hyperplasia group, and tumor-bearing lymph node model was established in another 18 rabbits as tumor group. For Gd-DTPA-enhanced MRI, T1WI and T2WI were performed on 9 animals of each model, and T1WI was acquired 80 seconds after administration of Gd-DTPA. For USPIO-enhanced MRI, T1WI, T2WI and T2*WI were performed on another 9 animals of each model before and 24 hours after administration of USPIO. MRI images were analyzed and correlated with surgical specimens and pathological results.
Results:
In the tumor group, the sensitivity, specificity, positive predictive value, negative predictive value and accuracy of Gd-DTPA-enhanced MRI were 62.5%, 91.3%, 88.2%, 70.0% and 76.6%, respectively. The corresponding values of USPIO-enhanced MRI were 95.0%, 90.9%, 90.5%, 95.2% and 92.9%, respectively. The sensitivity and accuracy of USPIO-enhanced MRI differ significantly from those of Gd-DTPA-enhanced MRI. In the hyperplasia group, the accuracy of Gd-DTPA-enhanced MRI was 74.2%, while 87.1% for USPIO-enhanced MRI.
Conclusion:
USPIO-enhanced MRI has higher accuracy in diagnosing metastatic lymph nodes than Gd-DTPA-enhanced MRI.
Insights
Ultrasmall superparamagnetic iron oxide (USPIO)-enhanced MRI shows superior accuracy in identifying metastatic lymph nodes compared to gadolinium diethylenetriaminepenta-acetic acid (Gd-DTPA)-enhanced MRI in rabbit models.
Area of Science:
- Radiology
- Oncology
- Medical Imaging
Background:
- Differentiating metastatic lymph nodes from reactive hyperplasia is crucial for cancer staging and treatment.
- Gadolinium diethylenetriaminepenta-acetic acid (Gd-DTPA) and ultrasmall superparamagnetic iron oxide (USPIO) are contrast agents used in MRI.
Purpose of the Study:
- To compare the diagnostic performance of Gd-DTPA-enhanced MRI and USPIO-enhanced MRI.
- To evaluate their effectiveness in distinguishing reactive hyperplastic lymph nodes from metastatic lymph nodes in a rabbit model.
Main Methods:
- Established reactive hyperplastic and tumor-bearing lymph node models in rabbits.
- Acquired MRI images using both Gd-DTPA and USPIO contrast agents.
- Correlated MRI findings with histopathological results.
Main Results:
- USPIO-enhanced MRI demonstrated higher sensitivity (95.0%) and accuracy (92.9%) than Gd-DTPA-enhanced MRI (sensitivity 62.5%, accuracy 76.6%) in identifying metastatic lymph nodes.
- USPIO-enhanced MRI also showed higher accuracy (87.1%) in the hyperplasia group compared to Gd-DTPA-enhanced MRI (74.2%).
Conclusions:
- USPIO-enhanced MRI is more accurate than Gd-DTPA-enhanced MRI for diagnosing lymph node metastasis.
- USPIO contrast offers improved diagnostic value in differentiating lymph node conditions.
